This should fix (all?) 60fps interpolation issues left. (#938)

* This should fix (all?) 60fps interpolation issues left.

Resolves #631 #917

* Update z_fishing.c

* Re-adds Emil's interpolation in certain places.

* move open/close disps out of if statments checking timer based vars, revert fishing to use recordopen/closed child

* move disps out of ifs for morpha

* use recordopen/recordclose for volv

* recordopen/recordclose for ganondorf

* switch back to recordopen/recordclose for ganondorf floor

* Frame interpolation now uses a 64bit parameter rather than 32.

* More 60fps fixes

* Fix close child typo

* add todo calls to recordopen/recordclose

* fix build

* revert long long frame interpolation

* add some epochs

* add more epochs

* bongo epochs

* the rest of the epochs

* fix the typo fix the build

* interpolation fixes pr cleanup

* init/cleanup bongo epochs

* bongo hand trails

* Fixes niw feathers

* Fixes bongo bongo hands, and replaces epoch * i with epoch + i

* don't update epochs

Co-authored-by: briaguya <briaguya@alice>

soh/include/z64effect.h

@@ -25,7 +25,8 @@ typedef struct {
     /* 0x0C */ Vec3f position;
     /* 0x18 */ Vec3s unkVelocity;
     /* 0x1E */ Vec3s unkPosition;
-} EffectSparkElement; // size = 0x24
+    /* 0x24 */ s32 epoch;
+} EffectSparkElement; // size = 0x28
 
 typedef struct {
     /* 0x000 */ Vec3s position;
@@ -117,7 +118,8 @@ typedef struct {
     /* 0x10 */ f32 startX;
     /* 0x14 */ s16 yaw;
     /* 0x16 */ s16 pitch;
-} EffectShieldParticleElement; // size = 0x18
+    /* 0x18 */ s32 epoch;
+} EffectShieldParticleElement; // size = 0x1C
 
 typedef struct {
     /* 0x00 */ u8 numElements;

soh/src/code/speed_meter.c

@@ -55,13 +55,13 @@ void SpeedMeter_DrawTimeEntries(SpeedMeter* this, GraphicsContext* gfxCtx) {
     uly = this->y;
     lry = this->y + 2;
 
-    OPEN_DISPS(gfxCtx);
-
     /*! @bug if gIrqMgrRetraceTime is 0, CLOSE_DISPS will never be reached */
     if (gIrqMgrRetraceTime == 0) {
         return;
     }
 
+    OPEN_DISPS(gfxCtx);
+
     sSpeedMeterTimeEntryPtr = &sSpeedMeterTimeEntryArray[0];
     for (i = 0; i < ARRAY_COUNT(sSpeedMeterTimeEntryArray); i++) {
         temp = ((f64) * (sSpeedMeterTimeEntryPtr->time) / gIrqMgrRetraceTime) * 64.0;

soh/src/code/z_actor.c

@@ -3973,6 +3973,8 @@ void Actor_DrawDoorLock(GlobalContext* globalCtx, s32 frame, s32 type) {
     f32 chainsTranslateX;
     f32 chainsTranslateY;
     f32 rotZStep;
+    static s32 epoch = 0;
+    epoch++;
 
     entry = &sDoorLocksInfo[type];
     chainRotZ = entry->chainsRotZInit;
@@ -3986,6 +3988,7 @@ void Actor_DrawDoorLock(GlobalContext* globalCtx, s32 frame, s32 type) {
     chainsTranslateY = cosf(entry->chainAngle - chainRotZ) * (10 - frame) * 0.1f * entry->chainLength;
 
     for (i = 0; i < 4; i++) {
+        FrameInterpolation_RecordOpenChild(entry, epoch + i * 25);
         Matrix_Put(&baseMtxF);
         Matrix_RotateZ(chainRotZ, MTXMODE_APPLY);
         Matrix_Translate(chainsTranslateX, chainsTranslateY, 0.0f, MTXMODE_APPLY);
@@ -4005,6 +4008,7 @@ void Actor_DrawDoorLock(GlobalContext* globalCtx, s32 frame, s32 type) {
         }
 
         chainRotZ += rotZStep;
+        FrameInterpolation_RecordCloseChild();
     }
 
     Matrix_Put(&baseMtxF);

soh/src/code/z_eff_shield_particle.c

@@ -47,6 +47,7 @@ void EffectShieldParticle_Init(void* thisx, void* initParamsx) {
             elem->endXChange = elem->initialSpeed;
             elem->yaw = Rand_ZeroOne() * 65534.0f;
             elem->pitch = Rand_ZeroOne() * 65534.0f;
+            elem->epoch++;
         }
 
         this->lightDecay = initParams->lightDecay;
@@ -156,7 +157,6 @@ void EffectShieldParticle_Draw(void* thisx, GraphicsContext* gfxCtx) {
     Color_RGBA8 primColor;
     Color_RGBA8 envColor;
 
-    FrameInterpolation_RecordOpenChild(this, 0);
     OPEN_DISPS(gfxCtx);
 
     if (this != NULL) {
@@ -182,6 +182,8 @@ void EffectShieldParticle_Draw(void* thisx, GraphicsContext* gfxCtx) {
         gDPPipeSync(POLY_XLU_DISP++);
 
         for (elem = &this->elements[0]; elem < &this->elements[this->numElements]; elem++) {
+            FrameInterpolation_RecordOpenChild(elem, elem->epoch);
+
             Mtx* mtx;
             MtxF sp104;
             MtxF spC4;
@@ -212,9 +214,10 @@ void EffectShieldParticle_Draw(void* thisx, GraphicsContext* gfxCtx) {
             gSPMatrix(POLY_XLU_DISP++, mtx, G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPVertex(POLY_XLU_DISP++, sVertices, 4, 0);
             gSP2Triangles(POLY_XLU_DISP++, 0, 1, 2, 0, 0, 3, 1, 0);
+            
+            FrameInterpolation_RecordCloseChild();
         }
     }
 
     CLOSE_DISPS(gfxCtx);
-    FrameInterpolation_RecordCloseChild();
 }

soh/src/code/z_eff_spark.c

@@ -89,6 +89,7 @@ void EffectSpark_Init(void* thisx, void* initParamsx) {
             elem->unkPosition.x = Rand_ZeroOne() * 65534.0f;
             elem->unkPosition.y = Rand_ZeroOne() * 65534.0f;
             elem->unkPosition.z = Rand_ZeroOne() * 65534.0f;
+            elem->epoch++;
         }
 
         this->timer = 0;
@@ -210,6 +211,8 @@ void EffectSpark_Draw(void* thisx, GraphicsContext* gfxCtx) {
             Mtx* mtx;
             f32 temp;
 
+            FrameInterpolation_RecordOpenChild(elem, elem->epoch);
+
             SkinMatrix_SetTranslate(&spEC, elem->position.x, elem->position.y, elem->position.z);
             temp = ((Rand_ZeroOne() * 2.5f) + 1.5f) / 64.0f;
             SkinMatrix_SetScale(&spAC, temp, temp, 1.0f);
@@ -264,6 +267,7 @@ void EffectSpark_Draw(void* thisx, GraphicsContext* gfxCtx) {
 
             mtx = SkinMatrix_MtxFToNewMtx(gfxCtx, &sp12C);
             if (mtx == NULL) {
+                FrameInterpolation_RecordCloseChild();
                 goto end;
             }
 
@@ -273,6 +277,8 @@ void EffectSpark_Draw(void* thisx, GraphicsContext* gfxCtx) {
         }
 
         gDPPipeSync(POLY_XLU_DISP++);
+
+        FrameInterpolation_RecordCloseChild();
     }
 
 end:

soh/src/code/z_kankyo.c

@@ -3,6 +3,7 @@
 #include "vt.h"
 #include "objects/gameplay_keep/gameplay_keep.h"
 #include "objects/gameplay_field_keep/gameplay_field_keep.h"
+#include "soh/frame_interpolation.h"
 
 typedef enum {
     /* 0 */ LENS_FLARE_CIRCLE0,
@@ -950,7 +951,6 @@ void Environment_Update(GlobalContext* globalCtx, EnvironmentContext* envCtx, Li
             Gfx* prevDisplayList;
 
             OPEN_DISPS(globalCtx->state.gfxCtx);
-
             prevDisplayList = POLY_OPA_DISP;
             displayList = Graph_GfxPlusOne(POLY_OPA_DISP);
             gSPDisplayList(OVERLAY_DISP++, displayList);
@@ -1459,6 +1459,8 @@ void Environment_DrawLensFlare(GlobalContext* globalCtx, EnvironmentContext* env
         LENS_FLARE_RING,    LENS_FLARE_CIRCLE1, LENS_FLARE_CIRCLE1, LENS_FLARE_CIRCLE1, LENS_FLARE_CIRCLE1,
         LENS_FLARE_CIRCLE1, LENS_FLARE_CIRCLE1, LENS_FLARE_CIRCLE1, LENS_FLARE_CIRCLE1, LENS_FLARE_CIRCLE1,
     };
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(gfxCtx);
 
@@ -1502,9 +1504,7 @@ void Environment_DrawLensFlare(GlobalContext* globalCtx, EnvironmentContext* env
         unk88Target = cosAngle;
     }
 
-    if (cosAngle < 0.0f) {
+    if (!(cosAngle < 0.0f)) {
-
-    } else {
         if (arg9) {
             u32 shrink = ShrinkWindow_GetCurrentVal();
             func_800C016C(globalCtx, &pos, &screenPos);
@@ -1517,6 +1517,8 @@ void Environment_DrawLensFlare(GlobalContext* globalCtx, EnvironmentContext* env
         }
 
         for (i = 0; i < ARRAY_COUNT(lensFlareTypes); i++) {
+            FrameInterpolation_RecordOpenChild("Lens Flare", epoch + i * 25);
+
             Matrix_Translate(pos.x, pos.y, pos.z, MTXMODE_NEW);
 
             if (arg9) {
@@ -1573,6 +1575,8 @@ void Environment_DrawLensFlare(GlobalContext* globalCtx, EnvironmentContext* env
                     gSPDisplayList(POLY_XLU_DISP++, gLensFlareRingDL);
                     break;
             }
+
+            FrameInterpolation_RecordCloseChild();
         }
 
         alphaScale = cosAngle - (1.5f - cosAngle);
@@ -1638,6 +1642,8 @@ void Environment_DrawRain(GlobalContext* globalCtx, View* view, GraphicsContext*
     Vec3f unused = { 0.0f, 0.0f, 0.0f };
     Vec3f windDirection = { 0.0f, 0.0f, 0.0f };
     Player* player = GET_PLAYER(globalCtx);
+    static s32 epoch = 0;
+    epoch++;
 
     if (!(globalCtx->cameraPtrs[0]->unk_14C & 0x100) && (globalCtx->envCtx.unk_EE[2] == 0)) {
         OPEN_DISPS(gfxCtx);
@@ -1667,6 +1673,8 @@ void Environment_DrawRain(GlobalContext* globalCtx, View* view, GraphicsContext*
 
         // draw rain drops
         for (i = 0; i < globalCtx->envCtx.unk_EE[1]; i++) {
+            FrameInterpolation_RecordOpenChild("Rain Drop", epoch + i * 25);
+
             temp2 = Rand_ZeroOne();
             temp1 = Rand_ZeroOne();
             temp3 = Rand_ZeroOne();
@@ -1692,6 +1700,8 @@ void Environment_DrawRain(GlobalContext* globalCtx, View* view, GraphicsContext*
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, gRaindropDL);
+
+            FrameInterpolation_RecordCloseChild();
         }
 
         // draw droplet rings on the ground
@@ -1699,6 +1709,8 @@ void Environment_DrawRain(GlobalContext* globalCtx, View* view, GraphicsContext*
             u8 firstDone = false;
 
             for (i = 0; i < globalCtx->envCtx.unk_EE[1]; i++) {
+                FrameInterpolation_RecordOpenChild("Droplet Ring", epoch + i * 25);
+                
                 if (!firstDone) {
                     func_80093D84(gfxCtx);
                     gDPSetEnvColor(POLY_XLU_DISP++, 155, 155, 155, 0);
@@ -1719,6 +1731,8 @@ void Environment_DrawRain(GlobalContext* globalCtx, View* view, GraphicsContext*
                 gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(gfxCtx),
                           G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
                 gSPDisplayList(POLY_XLU_DISP++, gEffShockwaveDL);
+
+                FrameInterpolation_RecordCloseChild();
             }
         }
 
@@ -1911,10 +1925,14 @@ void Environment_DrawLightning(GlobalContext* globalCtx, s32 unused) {
     s32 pad[2];
     Vec3f unused1 = { 0.0f, 0.0f, 0.0f };
     Vec3f unused2 = { 0.0f, 0.0f, 0.0f };
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
 
     for (i = 0; i < ARRAY_COUNT(sLightningBolts); i++) {
+        FrameInterpolation_RecordOpenChild("Lightning Bolt", epoch + i * 25);
+
         switch (sLightningBolts[i].state) {
             case LIGHTNING_BOLT_START:
                 dx = globalCtx->view.lookAt.x - globalCtx->view.eye.x;
@@ -1969,6 +1987,8 @@ void Environment_DrawLightning(GlobalContext* globalCtx, s32 unused) {
             gSPMatrix(POLY_XLU_DISP++, SEG_ADDR(1, 0), G_MTX_NOPUSH | G_MTX_MUL | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, gEffLightningDL);
         }
+        
+        FrameInterpolation_RecordCloseChild();
     }
 
     CLOSE_DISPS(globalCtx->state.gfxCtx);

soh/src/code/z_lifemeter.c

@@ -1,5 +1,6 @@
 #include "global.h"
 #include "textures/parameter_static/parameter_static.h"
+#include "soh/frame_interpolation.h"
 
 s16 Top_LM_Margin = 0;
 s16 Left_LM_Margin = 0;
@@ -412,6 +413,8 @@ void HealthMeter_Draw(GlobalContext* globalCtx) {
     s32 curCombineModeSet = 0;
     u8* curBgImgLoaded = NULL;
     s32 ddHeartCountMinusOne = gSaveContext.inventory.defenseHearts - 1;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(gfxCtx);
 
@@ -449,6 +452,8 @@ void HealthMeter_Draw(GlobalContext* globalCtx) {
     }
 
     for (i = 0; i < totalHeartCount; i++) {
+        FrameInterpolation_RecordOpenChild("HealthMeter Heart", epoch + i * 25);
+        
         if ((ddHeartCountMinusOne < 0) || (i > ddHeartCountMinusOne)) {
             if (i < fullHeartCount) {
                 if (curColorSet != 0) {
@@ -624,6 +629,8 @@ void HealthMeter_Draw(GlobalContext* globalCtx) {
                 offsetX = PosX_original;
             }
         }
+        
+        FrameInterpolation_RecordCloseChild();
     }
 
     CLOSE_DISPS(gfxCtx);

soh/src/overlays/actors/ovl_Bg_Dy_Yoseizo/z_bg_dy_yoseizo.c

@@ -10,6 +10,7 @@
 #include "overlays/actors/ovl_Demo_Effect/z_demo_effect.h"
 #include "scenes/indoors/yousei_izumi_yoko/yousei_izumi_yoko_scene.h"
 #include "scenes/indoors/daiyousei_izumi/daiyousei_izumi_scene.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_4 | ACTOR_FLAG_5 | ACTOR_FLAG_25)
 
@@ -960,6 +961,7 @@ void BgDyYoseizo_ParticleInit(BgDyYoseizo* this, Vec3f* initPos, Vec3f* initVelo
             particle->pitch = 0.0f;
             particle->yaw = Rand_CenteredFloat(30000.0f);
             particle->roll = 0.0f;
+            particle->epoch++;
             return;
         }
     }
@@ -1039,6 +1041,8 @@ void BgDyYoseizo_ParticleDraw(BgDyYoseizo* this, GlobalContext* globalCtx) {
     func_80093D84(globalCtx->state.gfxCtx);
 
     for (i = 0; i < 200; i++, particle++) {
+        FrameInterpolation_RecordOpenChild(particle, particle->epoch);
+        
         if (particle->alive == 1) {
             if (phi_s3 == 0) {
                 gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(gGreatFairyParticleAppearDL));
@@ -1060,6 +1064,8 @@ void BgDyYoseizo_ParticleDraw(BgDyYoseizo* this, GlobalContext* globalCtx) {
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(gGreatFairyParticleAliveDL));
         }
+        
+        FrameInterpolation_RecordCloseChild();
     }
 
     CLOSE_DISPS(gfxCtx);

soh/src/overlays/actors/ovl_Bg_Dy_Yoseizo/z_bg_dy_yoseizo.h

@@ -24,7 +24,8 @@ typedef struct {
     /* 0x36 */ f32 pitch;
     /* 0x36 */ f32 yaw;
     /* 0x40 */ f32 roll;
-} BgDyYoseizoParticle; // size = 0x44
+    /* 0x44 */ s32 epoch;
+} BgDyYoseizoParticle; // size = 0x48
 
 typedef struct BgDyYoseizo {
     /* 0x0000 */ Actor actor;

soh/src/overlays/actors/ovl_Bg_Jya_Megami/z_bg_jya_megami.c

@@ -1,6 +1,7 @@
 #include "z_bg_jya_megami.h"
 #include "overlays/effects/ovl_Effect_Ss_Kakera/z_eff_ss_kakera.h"
 #include "objects/object_jya_obj/object_jya_obj.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS 0
 
@@ -217,6 +218,7 @@ void BgJyaMegami_SetupExplode(BgJyaMegami* this) {
     for (i = 0; i < ARRAY_COUNT(this->pieces); i++) {
         Math_Vec3f_Copy(&this->pieces[i].pos, &this->dyna.actor.world.pos);
         this->pieces[i].vel.x = sPiecesInit[i].velX;
+        this->pieces[i].epoch++;
     }
     this->explosionTimer = 0;
 }
@@ -326,6 +328,9 @@ void BgJyaMegami_DrawExplode(BgJyaMegami* this, GlobalContext* globalCtx) {
 
     for (i = 0; i < ARRAY_COUNT(this->pieces); i++) {
         piece = &this->pieces[i];
+
+        FrameInterpolation_RecordOpenChild(piece, piece->epoch);
+
         Matrix_Translate(piece->pos.x + sPiecesInit[i].unk_00.x, piece->pos.y + sPiecesInit[i].unk_00.y,
                          piece->pos.z + sPiecesInit[i].unk_00.z, MTXMODE_NEW);
         Matrix_RotateY(piece->rotVelY * (M_PI / 0x8000), MTXMODE_APPLY);
@@ -337,6 +342,8 @@ void BgJyaMegami_DrawExplode(BgJyaMegami* this, GlobalContext* globalCtx) {
         gSPMatrix(POLY_OPA_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                   G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
         gSPDisplayList(POLY_OPA_DISP++, sDLists[i]);
+        
+        FrameInterpolation_RecordCloseChild();
     }
 
     CLOSE_DISPS(globalCtx->state.gfxCtx);

soh/src/overlays/actors/ovl_Bg_Jya_Megami/z_bg_jya_megami.h

@@ -13,7 +13,8 @@ typedef struct {
     /* 0x0C */ Vec3f vel;
     /* 0x18 */ s16 rotVelX;
     /* 0x1A */ s16 rotVelY;
-} BgJyaMegamiPiece; // size = 0x1C
+    /* 0x1C */ s32 epoch;
+} BgJyaMegamiPiece; // size = 0x20
 
 typedef struct BgJyaMegami {
     /* 0x0000 */ DynaPolyActor dyna;

soh/src/overlays/actors/ovl_Bg_Spot00_Hanebasi/z_bg_spot00_hanebasi.c

@@ -7,6 +7,7 @@
 #include "z_bg_spot00_hanebasi.h"
 #include "objects/object_spot00_objects/object_spot00_objects.h"
 #include "objects/gameplay_keep/gameplay_keep.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS ACTOR_FLAG_4
 
@@ -260,6 +261,8 @@ void BgSpot00Hanebasi_DrawTorches(Actor* thisx, GlobalContext* globalCtx2) {
     GlobalContext* globalCtx = globalCtx2;
     f32 angle;
     s32 i;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
 
@@ -276,6 +279,8 @@ void BgSpot00Hanebasi_DrawTorches(Actor* thisx, GlobalContext* globalCtx2) {
     gDPSetEnvColor(POLY_XLU_DISP++, 255, 0, 0, 0);
 
     for (i = 0; i < 2; i++) {
+        FrameInterpolation_RecordOpenChild("Hanebasi Torch", epoch + i * 25);
+
         gSPSegment(POLY_XLU_DISP++, 0x08,
                    Gfx_TwoTexScroll(globalCtx->state.gfxCtx, 0, 0, 0, 32, 64, 1, 0,
                                     ((globalCtx->gameplayFrames + i) * -20) & 0x1FF, 32, 128));
@@ -287,6 +292,8 @@ void BgSpot00Hanebasi_DrawTorches(Actor* thisx, GlobalContext* globalCtx2) {
         gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                   G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
         gSPDisplayList(POLY_XLU_DISP++, gEffFire1DL);
+
+        FrameInterpolation_RecordCloseChild();
     }
 
     CLOSE_DISPS(globalCtx->state.gfxCtx);

soh/src/overlays/actors/ovl_Boss_Dodongo/z_boss_dodongo.c

@@ -2,6 +2,7 @@
 #include "objects/object_kingdodongo/object_kingdodongo.h"
 #include "overlays/actors/ovl_Door_Warp1/z_door_warp1.h"
 #include "scenes/dungeons/ddan_boss/ddan_boss_room_1.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_0 | ACTOR_FLAG_2 | ACTOR_FLAG_4 | ACTOR_FLAG_5)
 
@@ -150,6 +151,7 @@ void func_808C17C8(GlobalContext* globalCtx, Vec3f* arg1, Vec3f* arg2, Vec3f* ar
 
     for (i = 0; i < arg5; i++, eff++) {
         if (eff->unk_24 == 0) {
+            eff->epoch++;
             eff->unk_24 = 1;
             eff->unk_00 = *arg1;
             eff->unk_0C = *arg2;
@@ -1700,6 +1702,7 @@ void BossDodongo_DrawEffects(GlobalContext* globalCtx) {
     gSPInvalidateTexCache(POLY_XLU_DISP++, 0);
 
     for (i = 0; i < 80; i++, eff++) {
+        FrameInterpolation_RecordOpenChild(eff, eff->epoch);
         if (eff->unk_24 == 1) {
             gDPPipeSync(POLY_XLU_DISP++);
 
@@ -1716,6 +1719,7 @@ void BossDodongo_DrawEffects(GlobalContext* globalCtx) {
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, object_kingdodongo_DL_009DD0);
         }
+        FrameInterpolation_RecordCloseChild();
     }
 
     CLOSE_DISPS(gfxCtx);

soh/src/overlays/actors/ovl_Boss_Dodongo/z_boss_dodongo.h

@@ -17,7 +17,8 @@ typedef struct {
     /* 0x26 */ Color_RGB8 color;
     /* 0x2A */ s16 alpha;
     /* 0x2C */ f32 unk_2C;
-} BossDodongoEffect; // Size = 0x30
+    /* 0x30 */ s32 epoch;
+} BossDodongoEffect; // Size = 0x34
 
 typedef struct BossDodongo {
     /* 0x0000 */ Actor actor;

soh/src/overlays/actors/ovl_Boss_Fd/z_boss_fd.c

@@ -1835,6 +1835,8 @@ void BossFd_DrawBody(GlobalContext* globalCtx, BossFd* this) {
     s16 i;
     f32 temp_float;
     Mtx* tempMat = Graph_Alloc(globalCtx->state.gfxCtx, 18 * sizeof(Mtx));
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
     if (this->skinSegments != 0) {
@@ -1876,6 +1878,8 @@ void BossFd_DrawBody(GlobalContext* globalCtx, BossFd* this) {
 
     Matrix_Push();
     for (i = 0; i < 18; i++, tempMat++) {
+        FrameInterpolation_RecordOpenChild(tempMat, epoch + i * 25);
+
         segIndex = (this->work[BFD_LEAD_BODY_SEG] + sBodyIndex[i + 1]) % 100;
         Matrix_Translate(this->bodySegsPos[segIndex].x, this->bodySegsPos[segIndex].y, this->bodySegsPos[segIndex].z,
                          MTXMODE_NEW);
@@ -1938,6 +1942,8 @@ void BossFd_DrawBody(GlobalContext* globalCtx, BossFd* this) {
         if (i > 0) {
             Collider_UpdateSpheres(i + 1, &this->collider);
         }
+        
+        FrameInterpolation_RecordCloseChild();
     }
     Matrix_Pop();
     osSyncPrintf("BH\n");

soh/src/overlays/actors/ovl_Boss_Fd2/z_boss_fd2.c

@@ -9,6 +9,7 @@
 #include "overlays/actors/ovl_Boss_Fd/z_boss_fd.h"
 #include "overlays/actors/ovl_Door_Warp1/z_door_warp1.h"
 #include "vt.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_0 | ACTOR_FLAG_2 | ACTOR_FLAG_4 | ACTOR_FLAG_5)
 
@@ -1146,6 +1147,8 @@ void BossFd2_UpdateMane(BossFd2* this, GlobalContext* globalCtx, Vec3f* head, Ve
     }
 
     for (i = 0; i < 9; i++) {
+        FrameInterpolation_RecordOpenChild(this, this->epoch + i * 25);
+
         Matrix_Translate((pos + i)->x, (pos + i)->y, (pos + i)->z, MTXMODE_NEW);
         Matrix_RotateY((rot + i)->y, MTXMODE_APPLY);
         Matrix_RotateX((rot + i)->x, MTXMODE_APPLY);
@@ -1155,6 +1158,8 @@ void BossFd2_UpdateMane(BossFd2* this, GlobalContext* globalCtx, Vec3f* head, Ve
         gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                   G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
         gSPDisplayList(POLY_XLU_DISP++, gHoleVolvagiaManeModelDL);
+
+        FrameInterpolation_RecordCloseChild();
     }
     Matrix_Pop();
     CLOSE_DISPS(globalCtx->state.gfxCtx);

soh/src/overlays/actors/ovl_Boss_Fd2/z_boss_fd2.h

@@ -87,6 +87,7 @@ typedef struct BossFd2 {
     /* 0x1394 */ BossFd2Cam camData;
     /* 0x141C */ ColliderJntSph collider;
     /* 0x143C */ ColliderJntSphElement elements[9];
-} BossFd2; // size = 0x167C
+    /* 0x167C */ s32 epoch;
+} BossFd2; // size = 0x1680
 
 #endif

soh/src/overlays/actors/ovl_Boss_Ganon/z_boss_ganon.c

@@ -3356,6 +3356,8 @@ void BossGanon_DrawShock(BossGanon* this, GlobalContext* globalCtx) {
     s32 pad;
     GraphicsContext* gfxCtx = globalCtx->state.gfxCtx;
     s16 i;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(gfxCtx);
 
@@ -3369,6 +3371,8 @@ void BossGanon_DrawShock(BossGanon* this, GlobalContext* globalCtx) {
             Player* player = GET_PLAYER(globalCtx);
 
             for (i = 0; i < ARRAY_COUNT(player->bodyPartsPos); i++) {
+                FrameInterpolation_RecordOpenChild("Ganondorf Shock 0", epoch + i * 25);
+
                 Matrix_Translate(player->bodyPartsPos[i].x, player->bodyPartsPos[i].y, player->bodyPartsPos[i].z,
                                  MTXMODE_NEW);
                 Matrix_ReplaceRotation(&globalCtx->billboardMtxF);
@@ -3377,9 +3381,13 @@ void BossGanon_DrawShock(BossGanon* this, GlobalContext* globalCtx) {
                 gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(gfxCtx),
                           G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
                 gSPDisplayList(POLY_XLU_DISP++, gDorfSquareDL);
+                
+                FrameInterpolation_RecordCloseChild();
             }
         } else {
             for (i = 1; i < 15; i++) {
+                FrameInterpolation_RecordOpenChild("Ganondorf Shock 1", epoch + i * 25);
+
                 Matrix_Translate(this->unk_2EC[i].x, this->unk_2EC[i].y, this->unk_2EC[i].z, MTXMODE_NEW);
                 Matrix_ReplaceRotation(&globalCtx->billboardMtxF);
                 Matrix_Scale(this->unk_49C[i], this->unk_49C[i], this->unk_49C[i], MTXMODE_APPLY);
@@ -3401,6 +3409,8 @@ void BossGanon_DrawShock(BossGanon* this, GlobalContext* globalCtx) {
                 } else {
                     gSPDisplayList(POLY_XLU_DISP++, gDorfSquareDL);
                 }
+
+                FrameInterpolation_RecordCloseChild();
             }
         }
     }
@@ -3443,16 +3453,18 @@ void BossGanon_DrawHandLightBall(BossGanon* this, GlobalContext* globalCtx) {
         gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                   G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
         gSPDisplayList(POLY_XLU_DISP++, gDorfLightCoreDL);
+    }
 
     CLOSE_DISPS(gfxCtx);
 }
-}
 
 void BossGanon_DrawBigMagicCharge(BossGanon* this, GlobalContext* globalCtx) {
     s32 pad;
     f32 yRot;
     GraphicsContext* gfxCtx = globalCtx->state.gfxCtx;
     s16 i;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(gfxCtx);
 
@@ -3513,6 +3525,8 @@ void BossGanon_DrawBigMagicCharge(BossGanon* this, GlobalContext* globalCtx) {
         yRot = BINANG_TO_RAD(this->actor.yawTowardsPlayer);
 
         for (i = 0; i < this->unk_1AC; i++) {
+            FrameInterpolation_RecordOpenChild("Ganondorf Big Magic", epoch + i * 25);
+
             f32 xzRot = (BossGanon_RandZeroOne() - 0.5f) * M_PI * 1.5f;
 
             gDPSetPrimColor(POLY_XLU_DISP++, 0, 0, 255, 255, 255, (s8)this->unk_294[i]);
@@ -3527,11 +3541,13 @@ void BossGanon_DrawBigMagicCharge(BossGanon* this, GlobalContext* globalCtx) {
             gSPDisplayList(POLY_XLU_DISP++, gDorfLightRayTriDL);
 
             Matrix_Pop();
+
+            FrameInterpolation_RecordCloseChild();
+        }
     }
 
     CLOSE_DISPS(gfxCtx);
 }
-}
 
 void BossGanon_DrawTriforce(BossGanon* this, GlobalContext* globalCtx) {
     s32 pad;
@@ -4142,6 +4158,8 @@ void BossGanon_LightBall_Draw(Actor* thisx, GlobalContext* globalCtx) {
     s16 i;
     f32 alpha;
     s32 pad;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
 
@@ -4166,6 +4184,8 @@ void BossGanon_LightBall_Draw(Actor* thisx, GlobalContext* globalCtx) {
 
     if (this->unk_1A8 == 1) {
         for (i = 0; i < 8; i++) {
+            FrameInterpolation_RecordOpenChild("Ganondorf Light Ball 0", epoch + i * 25);
+
             Matrix_Push();
             Matrix_RotateY(i * (M_PI / 8), MTXMODE_APPLY);
             Matrix_RotateZ(this->fwork[GDF_FWORK_0], MTXMODE_APPLY);
@@ -4174,6 +4194,8 @@ void BossGanon_LightBall_Draw(Actor* thisx, GlobalContext* globalCtx) {
 
             gSPDisplayList(POLY_XLU_DISP++, gDorfSquareDL);
             Matrix_Pop();
+
+            FrameInterpolation_RecordCloseChild();
         }
     } else if (this->unk_1A8 == 0) {
         Matrix_ReplaceRotation(&globalCtx->billboardMtxF);

soh/src/overlays/actors/ovl_Boss_Ganon2/z_boss_ganon2.c

@@ -5,6 +5,7 @@
 #include "objects/object_ganon2/object_ganon2.h"
 #include "objects/object_ganon_anime3/object_ganon_anime3.h"
 #include "objects/object_geff/object_geff.h"
+#include "soh/frame_interpolation.h"
 
 #include <string.h>
 
@@ -2463,6 +2464,8 @@ void func_80904340(BossGanon2* this, GlobalContext* globalCtx) {
     f32 angle;
     f32 sin;
     f32 cos;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
     Matrix_Push();
@@ -2485,6 +2488,7 @@ void func_80904340(BossGanon2* this, GlobalContext* globalCtx) {
         rand = BossGanon2_RandZeroOne();
 
         for (i = 0; i < 5; i++) {
+            FrameInterpolation_RecordOpenChild("Ganon 80904340", epoch + i * 25);
             angle = (i * (2 * M_PI / 5)) + (rand * M_PI);
             sin = 5000.0f * sinf(angle);
             cos = 5000.0f * cosf(angle);
@@ -2500,6 +2504,7 @@ void func_80904340(BossGanon2* this, GlobalContext* globalCtx) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(ovl_Boss_Ganon2_DL_00D798));
+            FrameInterpolation_RecordCloseChild();
         }
     }
 
@@ -2632,6 +2637,8 @@ void BossGanon2_PostLimbDraw(GlobalContext* globalCtx, s32 limbIndex, Gfx** dLis
 void func_80904D88(BossGanon2* this, GlobalContext* globalCtx) {
     s32 pad;
     s16 i;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
 
@@ -2647,6 +2654,8 @@ void func_80904D88(BossGanon2* this, GlobalContext* globalCtx) {
         gSPDisplayList(POLY_XLU_DISP++, ovl_Boss_Ganon2_DL_00B308);
 
         for (i = 0; i < 15; i++) {
+            FrameInterpolation_RecordOpenChild("Ganon 80904D88", epoch + i * 25);
+
             Matrix_Translate(this->unk_234[i].x, this->unk_234[i].y, this->unk_234[i].z, MTXMODE_NEW);
             Matrix_ReplaceRotation(&globalCtx->billboardMtxF);
             Matrix_Scale(this->unk_30C, this->unk_30C, this->unk_30C, MTXMODE_APPLY);
@@ -2654,6 +2663,8 @@ void func_80904D88(BossGanon2* this, GlobalContext* globalCtx) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, ovl_Boss_Ganon2_DL_00B378);
+            
+            FrameInterpolation_RecordCloseChild();
         }
     }
 
@@ -2690,6 +2701,8 @@ void func_80904FC8(BossGanon2* this, GlobalContext* globalCtx) {
 void func_8090523C(BossGanon2* this, GlobalContext* globalCtx) {
     Player* player;
     f32 phi_f20;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
 
@@ -2703,6 +2716,8 @@ void func_8090523C(BossGanon2* this, GlobalContext* globalCtx) {
         gSPDisplayList(POLY_XLU_DISP++, ovl_Boss_Ganon2_DL_00B308);
 
         for (i = 0; i < 11; i++) {
+            FrameInterpolation_RecordOpenChild("Ganon 8090523C", epoch + i * 25);
+
             Matrix_Mult(&player->mf_9E0, MTXMODE_NEW);
             Matrix_Translate((i * 250.0f) + 900.0f, 350.0f, 0.0f, MTXMODE_APPLY);
 
@@ -2718,6 +2733,8 @@ void func_8090523C(BossGanon2* this, GlobalContext* globalCtx) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(ovl_Boss_Ganon2_DL_00B378));
+            
+            FrameInterpolation_RecordCloseChild();
         }
     }
 
@@ -2916,6 +2933,8 @@ void func_809060E8(GlobalContext* globalCtx) {
     BossGanon2Effect* effect;
     s16 i;
     BossGanon2Effect* effects;
+    static s32 epoch = 0;
+    epoch++;
 
     effects = effect = globalCtx->specialEffects;
 
@@ -2925,6 +2944,8 @@ void func_809060E8(GlobalContext* globalCtx) {
 
     for (i = 0; i < 1; i++) {
         if (effect->type == 1) {
+            FrameInterpolation_RecordOpenChild("Ganon 809060E8 0", epoch + i * 25);
+
             Vec3f spA0;
             f32 temp_f0;
             f32 angle;
@@ -2958,6 +2979,8 @@ void func_809060E8(GlobalContext* globalCtx) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, ovl_Boss_Ganon2_DL_00F188);
+            
+            FrameInterpolation_RecordCloseChild();
         }
     }
 
@@ -2965,6 +2988,8 @@ void func_809060E8(GlobalContext* globalCtx) {
 
     for (i = 0; i < ARRAY_COUNT(sBossGanon2Particles); i++, effect++) {
         if (effect->type == 2) {
+            FrameInterpolation_RecordOpenChild("Ganon 809060E8 1", epoch + i * 25);
+
             if (!usingObjectGEff) {
                 BossGanon2_SetObjectSegment(NULL, globalCtx, OBJECT_GEFF, true);
                 usingObjectGEff++;
@@ -2977,6 +3002,8 @@ void func_809060E8(GlobalContext* globalCtx) {
             gSPMatrix(POLY_OPA_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_OPA_DISP++, gGanonRubbleDL);
+            
+            FrameInterpolation_RecordCloseChild();
         }
     }
 

soh/src/overlays/actors/ovl_Boss_Mo/z_boss_mo.c

@@ -348,6 +348,7 @@ void BossMo_Init(Actor* thisx, GlobalContext* globalCtx2) {
         globalCtx->specialEffects = sEffects;
         for (i = 0; i < ARRAY_COUNT(sEffects); i++) {
             sEffects[i].type = MO_FX_NONE;
+            sEffects[i].epoch++;
         }
         this->actor.world.pos.x = 200.0f;
         this->actor.world.pos.y = MO_WATER_LEVEL(globalCtx) + 50.0f;
@@ -2442,6 +2443,8 @@ void BossMo_DrawTentacle(BossMo* this, GlobalContext* globalCtx) {
     f32 phi_f20;
     f32 phi_f22;
     Vec3f sp110;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
 
@@ -2462,6 +2465,8 @@ void BossMo_DrawTentacle(BossMo* this, GlobalContext* globalCtx) {
     BossMo_InitRand(1, 29100, 9786);
 
     for (i = 0; i < 41; i++, matrix++) {
+        FrameInterpolation_RecordOpenChild("Morpha Tentacle", epoch + i * 25);
+
         s32 pad;
         s32 pad2;
 
@@ -2559,6 +2564,8 @@ void BossMo_DrawTentacle(BossMo* this, GlobalContext* globalCtx) {
         if ((i < 38) && ((i & 1) == 1)) {
             BossMo_UpdateTentColliders(this, i / 2, &this->tentCollider, &this->tentPos[i]);
         }
+        
+        FrameInterpolation_RecordCloseChild();
     }
 
     Matrix_Pop();

soh/src/overlays/actors/ovl_Boss_Sst/z_boss_sst.c

@@ -9,6 +9,7 @@
 #include "objects/gameplay_keep/gameplay_keep.h"
 #include "overlays/actors/ovl_Bg_Sst_Floor/z_bg_sst_floor.h"
 #include "overlays/actors/ovl_Door_Warp1/z_door_warp1.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_0 | ACTOR_FLAG_2 | ACTOR_FLAG_4 | ACTOR_FLAG_5 | ACTOR_FLAG_10)
 
@@ -2705,6 +2706,8 @@ s32 BossSst_OverrideHandTrailDraw(GlobalContext* globalCtx, s32 limbIndex, Gfx**
 
 void BossSst_DrawHand(Actor* thisx, GlobalContext* globalCtx) {
     BossSst* this = (BossSst*)thisx;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
 
@@ -2738,6 +2741,8 @@ void BossSst_DrawHand(Actor* thisx, GlobalContext* globalCtx) {
 
         for (i = 0; i < end; i++) {
             if (Math3D_Vec3fDistSq(&trail2->world.pos, &trail->world.pos) > 900.0f) {
+                FrameInterpolation_RecordOpenChild(trail, 0);
+
                 Matrix_SetTranslateRotateYXZ(trail->world.pos.x, trail->world.pos.y, trail->world.pos.z,
                                              &trail->world.rot);
                 Matrix_Scale(0.02f, 0.02f, 0.02f, MTXMODE_APPLY);
@@ -2749,6 +2754,8 @@ void BossSst_DrawHand(Actor* thisx, GlobalContext* globalCtx) {
                 POLY_XLU_DISP = SkelAnime_DrawFlex(globalCtx, this->skelAnime.skeleton, this->skelAnime.jointTable,
                                                    this->skelAnime.dListCount, BossSst_OverrideHandTrailDraw, NULL,
                                                    trail, POLY_XLU_DISP);
+                
+                FrameInterpolation_RecordCloseChild();
             }
             idx = (idx + 5) % 7;
             trail2 = trail;
@@ -2955,6 +2962,8 @@ void BossSst_SpawnHeadShadow(BossSst* this) {
         shadow->scale = 1450;
         shadow->alpha = 254;
         shadow->status = 65;
+
+        shadow->epoch++;
     }
 
     this->effects[3].status = -1;
@@ -2968,6 +2977,7 @@ void BossSst_SpawnHandShadow(BossSst* this) {
     this->effects[0].scale = 2300;
     this->effects[0].alpha = 254;
     this->effects[0].status = 5;
+    this->effects[0].epoch++;
     this->effects[1].status = -1;
 }
 
@@ -2981,6 +2991,7 @@ void BossSst_SpawnShockwave(BossSst* this) {
 
     for (i = 0; i < 3; i++) {
         BossSstEffect* shockwave = &this->effects[i];
+        shockwave->epoch++;
 
         Math_Vec3f_Copy(&shockwave->pos, &this->actor.world.pos);
         shockwave->move = (i + 9) * 2;
@@ -3035,6 +3046,8 @@ void BossSst_SpawnIceCrystal(BossSst* this, s32 index) {
     if ((index % 2) == 0) {
         Audio_PlayActorSound2(&this->actor, NA_SE_PL_FREEZE_S);
     }
+
+    ice->epoch++;
 }
 
 void BossSst_SpawnIceShard(BossSst* this) {
@@ -3050,6 +3063,7 @@ void BossSst_SpawnIceShard(BossSst* this) {
 
     for (i = 0; i < 18; i++) {
         BossSstEffect* ice = &this->effects[i];
+        ice->epoch++;
 
         Math_Vec3f_Copy(&ice->pos, &spawnPos);
         ice->status = 1;
@@ -3165,6 +3179,8 @@ void BossSst_DrawEffect(Actor* thisx, GlobalContext* globalCtx) {
 
             for (i = 0; i < 18; i++) {
                 effect = &this->effects[i];
+                FrameInterpolation_RecordOpenChild(effect, effect->epoch);
+
                 if (effect->move) {
                     func_8003435C(&effect->pos, globalCtx);
                     if (this->effects[0].status != 0) {
@@ -3182,6 +3198,8 @@ void BossSst_DrawEffect(Actor* thisx, GlobalContext* globalCtx) {
                               G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
                     gSPDisplayList(POLY_XLU_DISP++, gBongoIceShardDL);
                 }
+
+                FrameInterpolation_RecordCloseChild();
             }
         } else if (this->effectMode == BONGO_SHOCKWAVE) {
             f32 scaleY = 0.005f;
@@ -3193,6 +3211,7 @@ void BossSst_DrawEffect(Actor* thisx, GlobalContext* globalCtx) {
 
             for (i = 0; i < 3; i++, scaleY -= 0.001f) {
                 effect = &this->effects[i];
+                FrameInterpolation_RecordOpenChild(effect, effect->epoch);
 
                 if (effect->move != 0) {
                     Matrix_Translate(effect->pos.x, effect->pos.y, effect->pos.z, MTXMODE_NEW);
@@ -3205,6 +3224,8 @@ void BossSst_DrawEffect(Actor* thisx, GlobalContext* globalCtx) {
                               G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
                     gSPDisplayList(POLY_XLU_DISP++, gEffFireCircleDL);
                 }
+
+                FrameInterpolation_RecordCloseChild();
             }
         } else if (this->effectMode == BONGO_SHADOW) {
             gDPSetPrimColor(POLY_XLU_DISP++, 0x00, 0x80, 10, 10, 80, 0);
@@ -3212,12 +3233,16 @@ void BossSst_DrawEffect(Actor* thisx, GlobalContext* globalCtx) {
 
             effect = &this->effects[0];
             while (effect->status != -1) {
+                FrameInterpolation_RecordOpenChild(effect, effect->epoch);
+
                 Matrix_Translate(effect->pos.x, effect->pos.y, effect->pos.z, MTXMODE_NEW);
                 Matrix_Scale(effect->scale * 0.001f, 1.0f, effect->scale * 0.001f, MTXMODE_APPLY);
 
                 gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                           G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
                 gSPDisplayList(POLY_XLU_DISP++, sShadowDList);
+                
+                FrameInterpolation_RecordCloseChild();
                 effect++;
             }
         }

soh/src/overlays/actors/ovl_Boss_Sst/z_boss_sst.h

@@ -17,7 +17,8 @@ typedef struct {
     /* 0x0020 */ s16 move;
     /* 0x0022 */ s16 status;
     /* 0x0024 */ u8 alpha;
-} BossSstEffect; // size = 0x28
+    /* 0x0028 */ s32 epoch;
+} BossSstEffect; // size = 0x2C
 
 typedef struct {
     /* 0x0000 */ PosRot world;

soh/src/overlays/actors/ovl_Boss_Tw/z_boss_tw.c

@@ -2,6 +2,7 @@
 #include "objects/gameplay_keep/gameplay_keep.h"
 #include "objects/object_tw/object_tw.h"
 #include "overlays/actors/ovl_Door_Warp1/z_door_warp1.h"
+#include "soh/frame_interpolation.h"
 
 #include <string.h>
 
@@ -467,6 +468,7 @@ void BossTw_Init(Actor* thisx, GlobalContext* globalCtx2) {
 
         for (i = 0; i < ARRAY_COUNT(sTwEffects); i++) {
             sTwEffects[i].type = TWEFF_NONE;
+            sTwEffects[i].epoch++;
         }
     }
 
@@ -3327,6 +3329,8 @@ void func_80942180(BossTw* this, GlobalContext* globalCtx) {
 void func_809426F0(BossTw* this, GlobalContext* globalCtx) {
     s32 pad;
     s16 i;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
 
@@ -3360,6 +3364,8 @@ void func_809426F0(BossTw* this, GlobalContext* globalCtx) {
     }
 
     for (i = 0; i < 8; i++) {
+        FrameInterpolation_RecordOpenChild("Twinrova 809426F0", epoch + i * 25);
+
         Matrix_Push();
         Matrix_Translate(0.0f, 0.0f, 5000.0f, MTXMODE_APPLY);
         Matrix_RotateZ(((i * M_PI) * 2.0f * 0.125f) + this->flameRotation, MTXMODE_APPLY);
@@ -3373,6 +3379,8 @@ void func_809426F0(BossTw* this, GlobalContext* globalCtx) {
                   G_MTX_LOAD | G_MTX_MODELVIEW | G_MTX_NOPUSH);
         gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(object_tw_DL_01A430));
         Matrix_Pop();
+
+        FrameInterpolation_RecordCloseChild();
     }
 
     CLOSE_DISPS(globalCtx->state.gfxCtx);
@@ -4410,6 +4418,8 @@ void BossTw_BlastDraw(Actor* thisx, GlobalContext* globalCtx2) {
     f32 scaleFactor;
     s16 tailIdx;
     s16 i;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
 
@@ -4420,6 +4430,8 @@ void BossTw_BlastDraw(Actor* thisx, GlobalContext* globalCtx2) {
             gDPSetPrimColor(POLY_XLU_DISP++, 0, 0, 200, 20, 0, (s8)this->workf[TAIL_ALPHA]);
             gDPSetEnvColor(POLY_XLU_DISP++, 255, 215, 255, 128);
             for (i = 9; i >= 0; i--) {
+                FrameInterpolation_RecordOpenChild("Twinrova Fire Blast", epoch + i * 25);
+
                 gSPSegment(POLY_XLU_DISP++, 8,
                            Gfx_TwoTexScroll(
                                globalCtx->state.gfxCtx, 0, ((this->work[CS_TIMER_1] * 3) + (i * 10)) & 0x7F,
@@ -4434,6 +4446,8 @@ void BossTw_BlastDraw(Actor* thisx, GlobalContext* globalCtx2) {
                 gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                           G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
                 gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(object_tw_DL_01A430));
+                
+                FrameInterpolation_RecordCloseChild();
             }
             break;
 
@@ -4444,6 +4458,8 @@ void BossTw_BlastDraw(Actor* thisx, GlobalContext* globalCtx2) {
             gDPSetPrimColor(POLY_XLU_DISP++, 0, 0, 195, 225, 235, (s8)this->workf[TAIL_ALPHA]);
             gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(object_tw_DL_01A998));
             for (i = 9; i >= 0; i--) {
+                FrameInterpolation_RecordOpenChild("Twinrova Ice Blast", epoch + i * 25);
+
                 gSPSegment(POLY_XLU_DISP++, 8,
                            Gfx_TwoTexScroll(
                                globalCtx->state.gfxCtx, 0, ((this->work[CS_TIMER_1] * 3) + (i * 0xA)) & 0x7F,
@@ -4458,6 +4474,8 @@ void BossTw_BlastDraw(Actor* thisx, GlobalContext* globalCtx2) {
                 gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                           G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
                 gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(object_tw_DL_01AB00));
+
+                FrameInterpolation_RecordCloseChild();
             }
             break;
 
@@ -4474,6 +4492,8 @@ void BossTw_DrawDeathBall(Actor* thisx, GlobalContext* globalCtx2) {
     f32 scaleFactor;
     s16 tailIdx;
     s16 i;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
 
@@ -4484,6 +4504,8 @@ void BossTw_DrawDeathBall(Actor* thisx, GlobalContext* globalCtx2) {
         gDPSetEnvColor(POLY_XLU_DISP++, 255, 215, 255, 128);
 
         for (i = 9; i >= 0; i--) {
+            FrameInterpolation_RecordOpenChild("Twinrova Death Ball 0", epoch + i * 25);
+
             gSPSegment(POLY_XLU_DISP++, 8,
                        Gfx_TwoTexScroll(globalCtx->state.gfxCtx, 0, (((this->work[CS_TIMER_1] * 3) + (i * 0xA))) & 0x7F,
                                         (u8)((-this->work[CS_TIMER_1] * 0xF) + (i * 50)), 0x20, 0x40, 1, 0, 0, 0x20,
@@ -4498,12 +4520,16 @@ void BossTw_DrawDeathBall(Actor* thisx, GlobalContext* globalCtx2) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(object_tw_DL_01A430));
+
+            FrameInterpolation_RecordCloseChild();
         }
     } else {
         gDPSetPrimColor(POLY_XLU_DISP++, 0, 0, 195, 225, 235, (s8)this->workf[TAIL_ALPHA]);
         gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(object_tw_DL_01A998));
 
         for (i = 9; i >= 0; i--) {
+            FrameInterpolation_RecordOpenChild("Twinrova Death Ball 1", epoch + i * 25);
+
             gSPSegment(POLY_XLU_DISP++, 8,
                        Gfx_TwoTexScroll(globalCtx->state.gfxCtx, 0, (((this->work[CS_TIMER_1] * 3) + (i * 0xA))) & 0x7F,
                                         (u8)((-this->work[CS_TIMER_1] * 0xF) + (i * 50)), 0x20, 0x40, 1, 0, 0, 0x20,
@@ -4518,6 +4544,8 @@ void BossTw_DrawDeathBall(Actor* thisx, GlobalContext* globalCtx2) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(object_tw_DL_01AB00));
+
+            FrameInterpolation_RecordCloseChild();
         }
     }
 
@@ -4883,6 +4911,8 @@ void BossTw_DrawEffects(GlobalContext* globalCtx) {
 
     for (i = 0; i < ARRAY_COUNT(sTwEffects); i++) {
         if (currentEffect->type == 1) {
+            FrameInterpolation_RecordOpenChild(currentEffect, currentEffect->epoch);
+
             if (sp18F == 0) {
                 gSPDisplayList(POLY_XLU_DISP++, object_tw_DL_01A528);
                 sp18F++;
@@ -4896,8 +4926,9 @@ void BossTw_DrawEffects(GlobalContext* globalCtx) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, object_tw_DL_01A5A8);
-        }
 
+            FrameInterpolation_RecordCloseChild();
+        }
         currentEffect++;
     }
 
@@ -4906,6 +4937,8 @@ void BossTw_DrawEffects(GlobalContext* globalCtx) {
 
     for (i = 0; i < ARRAY_COUNT(sTwEffects); i++) {
         if (currentEffect->type == 3) {
+            FrameInterpolation_RecordOpenChild(currentEffect, currentEffect->epoch);
+
             if (sp18F == 0) {
                 gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(object_tw_DL_01A998));
                 sp18F++;
@@ -4921,6 +4954,8 @@ void BossTw_DrawEffects(GlobalContext* globalCtx) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(object_tw_DL_01AB00));
+            
+            FrameInterpolation_RecordCloseChild();
         }
         currentEffect++;
     }
@@ -4930,6 +4965,8 @@ void BossTw_DrawEffects(GlobalContext* globalCtx) {
 
     for (i = 0; i < ARRAY_COUNT(sTwEffects); i++) {
         if (currentEffect->type == 2) {
+            FrameInterpolation_RecordOpenChild(currentEffect, currentEffect->epoch);
+
             if (sp18F == 0) {
                 gDPPipeSync(POLY_XLU_DISP++);
                 gDPSetEnvColor(POLY_XLU_DISP++, 255, 215, 255, 128);
@@ -4946,6 +4983,8 @@ void BossTw_DrawEffects(GlobalContext* globalCtx) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(object_tw_DL_01A430));
+            
+            FrameInterpolation_RecordCloseChild();
         }
 
         currentEffect++;
@@ -4956,6 +4995,8 @@ void BossTw_DrawEffects(GlobalContext* globalCtx) {
 
     for (i = 0; i < ARRAY_COUNT(sTwEffects); i++) {
         if (currentEffect->type == 4) {
+            FrameInterpolation_RecordOpenChild(currentEffect, currentEffect->epoch);
+
             if (sp18F == 0) {
                 sp18F++;
             }
@@ -4991,6 +5032,8 @@ void BossTw_DrawEffects(GlobalContext* globalCtx) {
             gDPSetRenderMode(POLY_XLU_DISP++, G_RM_PASS, G_RM_AA_ZB_XLU_SURF2);
             gSPClearGeometryMode(POLY_XLU_DISP++, G_CULL_BACK | G_FOG);
             gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(object_tw_DL_01A790));
+
+            FrameInterpolation_RecordCloseChild();
         }
 
         currentEffect++;
@@ -5004,6 +5047,8 @@ void BossTw_DrawEffects(GlobalContext* globalCtx) {
         Vec3f off;
 
         if (currentEffect->type == TWEFF_PLYR_FRZ) {
+            FrameInterpolation_RecordOpenChild(currentEffect, currentEffect->epoch);
+
             if (sp18F == 0) {
                 gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(object_tw_DL_01AA50));
                 gDPSetPrimColor(POLY_XLU_DISP++, 0, 0, 195, 225, 235, 255);
@@ -5037,6 +5082,8 @@ void BossTw_DrawEffects(GlobalContext* globalCtx) {
                           G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
                 gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(object_tw_DL_01AB00));
             }
+
+            FrameInterpolation_RecordCloseChild();
         }
 
         currentEffect++;
@@ -5047,6 +5094,8 @@ void BossTw_DrawEffects(GlobalContext* globalCtx) {
 
     for (i = 0; i < ARRAY_COUNT(sTwEffects); i++) {
         if (currentEffect->type >= 6) {
+            FrameInterpolation_RecordOpenChild(currentEffect, currentEffect->epoch);
+
             if (currentEffect->work[EFF_ARGS] == 0) {
                 gDPSetPrimColor(POLY_XLU_DISP++, 0, 0, 195, 225, 235, currentEffect->alpha);
                 gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(object_tw_DL_01A998));
@@ -5070,6 +5119,8 @@ void BossTw_DrawEffects(GlobalContext* globalCtx) {
             } else {
                 gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(object_tw_DL_01A430));
             }
+
+            FrameInterpolation_RecordCloseChild();
         }
 
         currentEffect++;

soh/src/overlays/actors/ovl_Boss_Tw/z_boss_tw.h

@@ -43,6 +43,7 @@ typedef struct {
     /* 0x002E */ s16 work[EFF_WORK_MAX];
     /* 0x0034 */ f32 workf[EFF_FWORK_MAX];
     /* 0x0044 */ Actor* target;
+                 s32 epoch;
 } BossTwEffect;
 
 typedef enum {

soh/src/overlays/actors/ovl_Boss_Va/z_boss_va.c

@@ -4006,6 +4006,8 @@ void BossVa_DrawDoor(GlobalContext* globalCtx, s16 scale) {
     f32 yScale;
     f32 segAngle = 0.0f;
     s32 i;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
 
@@ -4023,6 +4025,8 @@ void BossVa_DrawDoor(GlobalContext* globalCtx, s16 scale) {
     Matrix_Get(&doorMtx);
 
     for (i = 0; i < 8; i++, segAngle -= M_PI / 4) {
+        FrameInterpolation_RecordOpenChild("Barinade Door", epoch + i * 25);
+
         Matrix_Put(&doorMtx);
         Matrix_RotateZ(segAngle, MTXMODE_APPLY);
         Matrix_Translate(0.0f, doorPieceLength[i] * yScale, 0.0f, MTXMODE_APPLY);
@@ -4030,6 +4034,8 @@ void BossVa_DrawDoor(GlobalContext* globalCtx, s16 scale) {
         gSPMatrix(POLY_OPA_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                   G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
         gSPDisplayList(POLY_OPA_DISP++, doorPieceDispList[i]);
+
+        FrameInterpolation_RecordCloseChild();
     }
 
     CLOSE_DISPS(globalCtx->state.gfxCtx);

soh/src/overlays/actors/ovl_Demo_6K/z_demo_6k.c

@@ -10,6 +10,7 @@
 #include "objects/object_demo_6k/object_demo_6k.h"
 #include "objects/object_gnd_magic/object_gnd_magic.h"
 #include "overlays/actors/ovl_Eff_Dust/z_eff_dust.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS ACTOR_FLAG_4
 
@@ -563,9 +564,10 @@ void func_80967FFC(Actor* thisx, GlobalContext* globalCtx) {
     Demo6K* this = (Demo6K*)thisx;
     s32 pad;
     u16 timer1 = this->timer1;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
-
     func_80093D84(globalCtx->state.gfxCtx);
     Matrix_RotateX(-M_PI / 2, MTXMODE_APPLY);
     gSPSegment(POLY_XLU_DISP++, 0x08,
@@ -584,6 +586,8 @@ void func_80967FFC(Actor* thisx, GlobalContext* globalCtx) {
         Matrix_RotateZ(-M_PI / 2, MTXMODE_APPLY);
 
         for (i = 0; i < 6; i++) {
+            FrameInterpolation_RecordOpenChild("Demo6K 80967FFC", epoch + i * 25);
+    
             Matrix_RotateZ(M_PI / 3, MTXMODE_APPLY);
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
@@ -591,6 +595,8 @@ void func_80967FFC(Actor* thisx, GlobalContext* globalCtx) {
             gDPSetPrimColor(POLY_XLU_DISP++, 0, 0x80, colors[i][0].r, colors[i][0].g, colors[i][0].b, 255);
             gDPSetEnvColor(POLY_XLU_DISP++, colors[i][1].r, colors[i][1].g, colors[i][1].b, 255);
             gSPDisplayList(POLY_XLU_DISP++, object_demo_6k_DL_0022B0);
+
+            FrameInterpolation_RecordCloseChild();
         }
 
         // required to avoid optimizing out i
@@ -689,6 +695,8 @@ void func_809688C4(Actor* thisx, GlobalContext* globalCtx2) {
     GlobalContext* globalCtx = globalCtx2;
     u32 frames = globalCtx->state.frames;
     s32 i;
+    static s32 epoch = 0;
+    epoch++;
 
     if ((i = (globalCtx->csCtx.state != CS_STATE_IDLE) && (globalCtx->csCtx.npcActions[1] != NULL)) &&
         (globalCtx->csCtx.npcActions[1]->action != 1)) {
@@ -699,6 +707,8 @@ void func_809688C4(Actor* thisx, GlobalContext* globalCtx2) {
         Matrix_RotateY((s16)(Camera_GetCamDirYaw(GET_ACTIVE_CAM(globalCtx)) + 0x8000) * (M_PI / 0x8000), MTXMODE_APPLY);
 
         for (i = 0; i < 16; i++) {
+            FrameInterpolation_RecordOpenChild("Demo6K 809688C4", epoch + i * 25);
+
             gDPPipeSync(POLY_XLU_DISP++);
             gDPSetEnvColor(POLY_XLU_DISP++, sEnvColors[this->unk_274[i]].r, sEnvColors[this->unk_274[i]].g,
                            sEnvColors[this->unk_274[i]].b, 255);
@@ -712,6 +722,8 @@ void func_809688C4(Actor* thisx, GlobalContext* globalCtx2) {
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, gEffFlash1DL);
             Matrix_Pop();
+
+            FrameInterpolation_RecordCloseChild();
         }
 
         gSPDisplayList(POLY_XLU_DISP++, gEffFlash1DL);

soh/src/overlays/actors/ovl_Demo_Kankyo/z_demo_kankyo.c

@@ -3,6 +3,7 @@
 #include "objects/gameplay_keep/gameplay_keep.h"
 #include "objects/object_efc_star_field/object_efc_star_field.h"
 #include "objects/object_toki_objects/object_toki_objects.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_4 | ACTOR_FLAG_5)
 
@@ -521,6 +522,8 @@ void DemoKankyo_DrawRain(Actor* thisx, GlobalContext* globalCtx) {
     f32 translateY;
     f32 translateZ;
     s16 j;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
 
@@ -594,6 +597,8 @@ void DemoKankyo_DrawRain(Actor* thisx, GlobalContext* globalCtx) {
         Matrix_Scale(sRainScale * 0.001f, sRainScale * 0.001f, sRainScale * 0.001f, MTXMODE_APPLY);
 
         for (j = 0; j < 5; j++) {
+            FrameInterpolation_RecordOpenChild("Kankyo Rain", epoch + i * j * 25);
+
             s32 pad1;
 
             if (globalCtx->sceneNum != SCENE_TOKINOMA) {
@@ -623,6 +628,8 @@ void DemoKankyo_DrawRain(Actor* thisx, GlobalContext* globalCtx) {
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             POLY_XLU_DISP = Gfx_CallSetupDL(POLY_XLU_DISP, 0x14);
             gSPDisplayList(POLY_XLU_DISP++, object_efc_star_field_DL_000080);
+
+            FrameInterpolation_RecordCloseChild();
         }
     }
     CLOSE_DISPS(globalCtx->state.gfxCtx);
@@ -656,10 +663,14 @@ void DemoKankyo_DrawClouds(Actor* thisx, GlobalContext* globalCtx) {
     f32 dx;
     f32 dy;
     f32 dz;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
 
     for (i = 0; i < 30; i++) {
+        FrameInterpolation_RecordOpenChild("Kankyo Clouds", epoch + i * 25);
+
         dx = -(Math_SinS(this->unk_150[i].unk_20 - 0x8000) * 120.0f) * (30.0f + (i / 30.0f) * 10.0f);
         dy = Math_CosS(this->unk_150[i].unk_20 - 0x8000) * 5.0f + 1200.0f;
         dz = (Math_CosS(this->unk_150[i].unk_20 - 0x8000) * 120.0f) * (30.0f + (i / 30.0f) * 10.0f);
@@ -681,6 +692,8 @@ void DemoKankyo_DrawClouds(Actor* thisx, GlobalContext* globalCtx) {
 
         gSPMatrix(POLY_XLU_DISP++, SEG_ADDR(1, 0), G_MTX_NOPUSH | G_MTX_MUL | G_MTX_MODELVIEW);
         gSPDisplayList(POLY_XLU_DISP++, gEffDustDL);
+
+        FrameInterpolation_RecordCloseChild();
     }
 
     CLOSE_DISPS(globalCtx->state.gfxCtx);
@@ -771,6 +784,8 @@ void DemoKankyo_DrawWarpSparkles(Actor* thisx, GlobalContext* globalCtx) {
     f32 translateZ;
     PosRot posRot;
     u8 linkAge = gSaveContext.linkAge;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
 
@@ -778,6 +793,8 @@ void DemoKankyo_DrawWarpSparkles(Actor* thisx, GlobalContext* globalCtx) {
         this->sparkleCounter += 2;
     }
     for (i = this->sparkleCounter - 1; i >= 0; i--) {
+        FrameInterpolation_RecordOpenChild("Kankyo Warp Sparkles", epoch + i * 25);
+
         temp_f22 = 1.0f - (i / (f32)this->sparkleCounter);
 
         switch (this->unk_150[i].unk_22) {
@@ -891,6 +908,8 @@ void DemoKankyo_DrawWarpSparkles(Actor* thisx, GlobalContext* globalCtx) {
             gSPDisplayList(POLY_XLU_DISP++, disp);
             this->unk_150[i].unk_24 += 0x190;
         }
+
+        FrameInterpolation_RecordCloseChild();
     }
 
     CLOSE_DISPS(globalCtx->state.gfxCtx);
@@ -914,6 +933,8 @@ void DemoKankyo_DrawSparkles(Actor* thisx, GlobalContext* globalCtx) {
     f32 scale;
     s16 i;
     PosRot posRot;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
 
@@ -922,6 +943,8 @@ void DemoKankyo_DrawSparkles(Actor* thisx, GlobalContext* globalCtx) {
     }
 
     for (i = this->sparkleCounter - 1; i >= 0; i--) {
+        FrameInterpolation_RecordOpenChild("Kankyo Sparkles", epoch + i * 25);
+
         temp_f20 = 1.0f - (i / (f32)this->sparkleCounter);
 
         switch (this->unk_150[i].unk_22) {
@@ -993,6 +1016,8 @@ void DemoKankyo_DrawSparkles(Actor* thisx, GlobalContext* globalCtx) {
             gSPDisplayList(POLY_XLU_DISP++, gEffFlash1DL);
             this->unk_150[i].unk_24 += 0x190;
         }
+
+        FrameInterpolation_RecordCloseChild();
     }
 
     CLOSE_DISPS(globalCtx->state.gfxCtx);

soh/src/overlays/actors/ovl_Efc_Erupc/z_efc_erupc.c

@@ -1,5 +1,6 @@
 #include "z_efc_erupc.h"
 #include "objects/object_efc_erupc/object_efc_erupc.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_4 | ACTOR_FLAG_5)
 
@@ -167,6 +168,8 @@ void EfcErupc_DrawParticles(EfcErupcParticles* particles, GlobalContext* globalC
 
     OPEN_DISPS(gfxCtx);
     for (i = 0; i < EFC_ERUPC_NUM_PARTICLES; i++, particles++) {
+        FrameInterpolation_RecordOpenChild(particles, particles->epoch);
+
         if (particles->isActive) {
             func_80093D84(globalCtx->state.gfxCtx);
             gSPDisplayList(POLY_XLU_DISP++, object_efc_erupc_DL_002760);
@@ -181,7 +184,10 @@ void EfcErupc_DrawParticles(EfcErupcParticles* particles, GlobalContext* globalC
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, object_efc_erupc_DL_0027D8);
         }
+
+        FrameInterpolation_RecordCloseChild();
     }
+
     CLOSE_DISPS(gfxCtx);
 }
 
@@ -249,5 +255,6 @@ void EfcErupc_InitParticles(EfcErupcParticles* particles) {
 
     for (i = 0; i < EFC_ERUPC_NUM_PARTICLES; i++, particles++) {
         particles->isActive = false;
+        particles->epoch++;
     }
 }

soh/src/overlays/actors/ovl_Efc_Erupc/z_efc_erupc.h

@@ -19,7 +19,8 @@ typedef struct {
     /* 0x30 */ char unk_2C[4];
     /* 0x34 */ f32 scale;
     /* 0x38 */ char unk_34[8];
-} EfcErupcParticles; // size 0x3C
+    /* 0x3C */ s32 epoch;
+} EfcErupcParticles; // size 0x40
 
 #define EFC_ERUPC_NUM_PARTICLES 100
 

soh/src/overlays/actors/ovl_Eff_Dust/z_eff_dust.c

@@ -6,6 +6,7 @@
 
 #include "z_eff_dust.h"
 #include "objects/gameplay_keep/gameplay_keep.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_4 | ACTOR_FLAG_5)
 
@@ -268,6 +269,8 @@ void EffDust_DrawFunc_8099E4F4(Actor* thisx, GlobalContext* globalCtx2) {
     f32* distanceTraveled;
     s32 i;
     f32 aux;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(gfxCtx);
 
@@ -283,6 +286,8 @@ void EffDust_DrawFunc_8099E4F4(Actor* thisx, GlobalContext* globalCtx2) {
     gSPSegment(POLY_XLU_DISP++, 0x08, sEmptyDL);
 
     for (i = 0; i < 64; i++) {
+        FrameInterpolation_RecordOpenChild("Dust 8099E4F4", epoch + i * 25);
+
         if (*distanceTraveled < 1.0f) {
             aux = 1.0f - (*distanceTraveled * *distanceTraveled);
             Matrix_Translate(this->actor.world.pos.x + (initialPositions->x * ((this->dx * aux) + (1.0f - this->dx))),
@@ -298,6 +303,8 @@ void EffDust_DrawFunc_8099E4F4(Actor* thisx, GlobalContext* globalCtx2) {
             gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(gEffSparklesDL));
         }
 
+        FrameInterpolation_RecordCloseChild();
+
         initialPositions++;
         distanceTraveled++;
     }
@@ -314,6 +321,8 @@ void EffDust_DrawFunc_8099E784(Actor* thisx, GlobalContext* globalCtx2) {
     s32 i;
     f32 aux;
     Player* player = GET_PLAYER(globalCtx);
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(gfxCtx);
 
@@ -333,6 +342,8 @@ void EffDust_DrawFunc_8099E784(Actor* thisx, GlobalContext* globalCtx2) {
     gSPSegment(POLY_XLU_DISP++, 0x08, sEmptyDL);
 
     for (i = 0; i < 64; i++) {
+        FrameInterpolation_RecordOpenChild("Dust 8099E784", epoch + i * 25);
+
         if (*distanceTraveled < 1.0f) {
             gDPSetPrimColor(POLY_XLU_DISP++, 0, 0, 255, 255, 255, *distanceTraveled * 255);
 
@@ -357,6 +368,8 @@ void EffDust_DrawFunc_8099E784(Actor* thisx, GlobalContext* globalCtx2) {
             gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(gEffSparklesDL));
         }
 
+        FrameInterpolation_RecordCloseChild();
+
         initialPositions++;
         distanceTraveled++;
     }

soh/src/overlays/actors/ovl_En_Anubice_Fire/z_en_anubice_fire.c

@@ -7,6 +7,7 @@
 #include "z_en_anubice_fire.h"
 #include "objects/gameplay_keep/gameplay_keep.h"
 #include "objects/object_anubice/object_anubice.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS ACTOR_FLAG_4
 
@@ -62,6 +63,7 @@ void EnAnubiceFire_Init(Actor* thisx, GlobalContext* globalCtx) {
     this->unk_15A = 30;
     this->unk_154 = 2.0f;
     this->scale = 0.0f;
+    this->epoch++;
 
     for (i = 0; i < 6; i++) {
         this->unk_160[i] = this->actor.world.pos;
@@ -230,6 +232,8 @@ void EnAnubiceFire_Draw(Actor* thisx, GlobalContext* globalCtx) {
 
     Matrix_Push();
     for (i = this->unk_15E; i < 6; ++i) {
+        FrameInterpolation_RecordOpenChild(this, this->epoch + i * 25);
+
         f32 scale = this->actor.scale.x - (i * 0.2f);
 
         if (scale < 0.0f) {
@@ -248,6 +252,8 @@ void EnAnubiceFire_Draw(Actor* thisx, GlobalContext* globalCtx) {
             gSPDisplayList(POLY_XLU_DISP++, gAnubiceFireAttackDL);
         }
 
+        FrameInterpolation_RecordCloseChild();
+
         if (this->scale < 0.1f) {
             break;
         }

soh/src/overlays/actors/ovl_En_Anubice_Fire/z_en_anubice_fire.h

@@ -19,6 +19,7 @@ typedef struct EnAnubiceFire {
     /* 0x015E */ s16 unk_15E;
     /* 0x0178 */ Vec3f unk_160[6];
     /* 0x01A8 */ ColliderCylinder cylinder;
-} EnAnubiceFire; // size = 0x01F4
+    /* 0x01F4 */ s32 epoch;
+} EnAnubiceFire; // size = 0x01F8
 
 #endif

soh/src/overlays/actors/ovl_En_Ba/z_en_ba.c

@@ -6,6 +6,7 @@
 
 #include "z_en_ba.h"
 #include "objects/object_bxa/object_bxa.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_0 | ACTOR_FLAG_2 | ACTOR_FLAG_4)
 
@@ -107,6 +108,7 @@ void EnBa_Init(Actor* thisx, GlobalContext* globalCtx) {
     this->actor.targetMode = 4;
     this->upperParams = (thisx->params >> 8) & 0xFF;
     thisx->params &= 0xFF;
+    this->epoch++;
 
     if (this->actor.params < EN_BA_DEAD_BLOB) {
         if (Flags_GetSwitch(globalCtx, this->upperParams)) {
@@ -489,6 +491,8 @@ void EnBa_Draw(Actor* thisx, GlobalContext* globalCtx) {
                    Gfx_TwoTexScroll(globalCtx->state.gfxCtx, 0, 0, 0, 16, 16, 1, 0,
                                     (globalCtx->gameplayFrames * -10) % 128, 32, 32));
         for (i = 0; i < 14; i++, mtx++) {
+            FrameInterpolation_RecordOpenChild(this, this->epoch + i * 25);
+
             Matrix_Translate(this->unk158[i].x, this->unk158[i].y, this->unk158[i].z, MTXMODE_NEW);
             Matrix_RotateZYX(this->unk2A8[i].x, this->unk2A8[i].y, this->unk2A8[i].z, MTXMODE_APPLY);
             Matrix_Scale(this->unk200[i].x, this->unk200[i].y, this->unk200[i].z, MTXMODE_APPLY);
@@ -504,6 +508,8 @@ void EnBa_Draw(Actor* thisx, GlobalContext* globalCtx) {
                 }
             }
             MATRIX_TOMTX(mtx);
+
+            FrameInterpolation_RecordCloseChild();
         }
         Matrix_Pop();
         gSPMatrix(POLY_OPA_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),

soh/src/overlays/actors/ovl_En_Ba/z_en_ba.h

@@ -32,6 +32,7 @@ typedef struct EnBa {
     /* 0x031C */ s16 unk31C;
     /* 0x0320 */ ColliderJntSph collider;
     /* 0x0340 */ ColliderJntSphElement colliderItems[2];
-} EnBa; // size = 0x03C0
+    /* 0x03C0 */ s32 epoch;
+} EnBa; // size = 0x03C4
 
 #endif

soh/src/overlays/actors/ovl_En_Bx/z_en_bx.c

@@ -6,6 +6,7 @@
 
 #include "z_en_bx.h"
 #include "objects/object_bxa/object_bxa.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS ACTOR_FLAG_4
 
@@ -103,6 +104,7 @@ void EnBx_Init(Actor* thisx, GlobalContext* globalCtx) {
         Actor_Kill(&this->actor);
     }
     thisx->params &= 0xFF;
+    this->epoch++;
 }
 
 void EnBx_Destroy(Actor* thisx, GlobalContext* globalCtx) {
@@ -235,10 +237,14 @@ void EnBx_Draw(Actor* thisx, GlobalContext* globalCtx) {
     }
 
     for (i = 0; i < 4; i++, mtx++) {
+        FrameInterpolation_RecordOpenChild(this, this->epoch + i * 25);
+
         Matrix_Translate(this->unk_154[i].x, this->unk_154[i].y, this->unk_154[i].z, MTXMODE_NEW);
         Matrix_RotateZYX(this->unk_1B4[i].x, this->unk_1B4[i].y, this->unk_1B4[i].z, MTXMODE_APPLY);
         Matrix_Scale(this->unk_184[i].x, this->unk_184[i].y, this->unk_184[i].z, MTXMODE_APPLY);
         MATRIX_TOMTX(mtx);
+
+        FrameInterpolation_RecordCloseChild();
     }
 
     gSPDisplayList(POLY_OPA_DISP++, object_bxa_DL_0022F0);

soh/src/overlays/actors/ovl_En_Bx/z_en_bx.h

@@ -16,6 +16,7 @@ typedef struct EnBx {
     /* 0x01B4 */ Vec3s unk_1B4[4];
     /* 0x01CC */ ColliderCylinder collider;
     /* 0x0218 */ ColliderQuad colliderQuad;
-} EnBx; // size = 0x0298
+    /* 0x0298 */ s32 epoch;
+} EnBx; // size = 0x029C
 
 #endif

soh/src/overlays/actors/ovl_En_Clear_Tag/z_en_clear_tag.c

@@ -2,6 +2,8 @@
 
 #include <string.h>
 
+#include "soh/frame_interpolation.h"
+
 #define FLAGS (ACTOR_FLAG_0 | ACTOR_FLAG_2 | ACTOR_FLAG_4 | ACTOR_FLAG_5)
 
 void EnClearTag_Init(Actor* thisx, GlobalContext* globalCtx);
@@ -278,6 +280,7 @@ void EnClearTag_Init(Actor* thisx, GlobalContext* globalCtx) {
             globalCtx->specialEffects = &sClearTagEffects[0];
             for (i = 0; i < CLEAR_TAG_EFFECT_MAX_COUNT; i++) {
                 sClearTagEffects[i].type = CLEAR_TAG_EFFECT_AVAILABLE;
+                sClearTagEffects[i].epoch++;
             }
             this->drawMode = CLEAR_TAG_DRAW_MODE_ALL;
         }
@@ -902,6 +905,8 @@ void EnClearTag_DrawEffects(GlobalContext* globalCtx) {
 
     // Draw all Debris effects.
     for (i = 0; i < CLEAR_TAG_EFFECT_MAX_COUNT; i++, effect++) {
+        FrameInterpolation_RecordOpenChild(effect, effect->epoch);
+
         if (effect->type == CLEAR_TAG_EFFECT_DEBRIS) {
             // Apply the debris effect material if it has not already been applied.
             if (!isMaterialApplied) {
@@ -918,6 +923,8 @@ void EnClearTag_DrawEffects(GlobalContext* globalCtx) {
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_OPA_DISP++, gArwingDebrisEffectDL);
         }
+
+        FrameInterpolation_RecordCloseChild();
     }
 
     // Draw all ground flash effects.
@@ -925,6 +932,8 @@ void EnClearTag_DrawEffects(GlobalContext* globalCtx) {
     isMaterialApplied = false;
     for (i = 0; i < CLEAR_TAG_EFFECT_MAX_COUNT; i++, effect++) {
         if (effect->type == CLEAR_TAG_EFFECT_FLASH) {
+            FrameInterpolation_RecordOpenChild(effect, effect->epoch);
+
             // Apply the flash ground effect material if it has not already been applied.
             if (!isMaterialApplied) {
                 gDPPipeSync(POLY_XLU_DISP++);
@@ -941,6 +950,8 @@ void EnClearTag_DrawEffects(GlobalContext* globalCtx) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, gArwingFlashEffectGroundDL);
+
+            FrameInterpolation_RecordCloseChild();
         }
     }
 
@@ -949,6 +960,8 @@ void EnClearTag_DrawEffects(GlobalContext* globalCtx) {
     isMaterialApplied = false;
     for (i = 0; i < CLEAR_TAG_EFFECT_MAX_COUNT; i++, effect++) {
         if (effect->type == CLEAR_TAG_EFFECT_SMOKE) {
+            FrameInterpolation_RecordOpenChild(effect, effect->epoch);
+
             // Apply the smoke effect material if it has not already been applied.
             if (!isMaterialApplied) {
                 gSPDisplayList(POLY_XLU_DISP++, gArwingFireEffectMaterialDL);
@@ -970,6 +983,8 @@ void EnClearTag_DrawEffects(GlobalContext* globalCtx) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, gArwingFireEffectDL);
+        
+            FrameInterpolation_RecordCloseChild();
         }
     }
 
@@ -978,6 +993,8 @@ void EnClearTag_DrawEffects(GlobalContext* globalCtx) {
     isMaterialApplied = false;
     for (i = 0; i < CLEAR_TAG_EFFECT_MAX_COUNT; i++, effect++) {
         if (effect->type == CLEAR_TAG_EFFECT_FIRE) {
+            FrameInterpolation_RecordOpenChild(effect, effect->epoch);
+
             // Apply the fire effect material if it has not already been applied.
             if (!isMaterialApplied) {
                 gSPDisplayList(POLY_XLU_DISP++, gArwingFireEffectMaterialDL);
@@ -996,6 +1013,8 @@ void EnClearTag_DrawEffects(GlobalContext* globalCtx) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, gArwingFireEffectDL);
+
+            FrameInterpolation_RecordCloseChild();
         }
     }
 
@@ -1004,6 +1023,8 @@ void EnClearTag_DrawEffects(GlobalContext* globalCtx) {
     isMaterialApplied = false;
     for (i = 0; i < CLEAR_TAG_EFFECT_MAX_COUNT; i++, effect++) {
         if (effect->type == CLEAR_TAG_EFFECT_FLASH) {
+            FrameInterpolation_RecordOpenChild(effect, effect->epoch);
+
             // Apply the flash billboard effect material if it has not already been applied.
             if (!isMaterialApplied) {
                 gDPPipeSync(POLY_XLU_DISP++);
@@ -1019,6 +1040,8 @@ void EnClearTag_DrawEffects(GlobalContext* globalCtx) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, gArwingFlashEffectDL);
+
+            FrameInterpolation_RecordCloseChild();
         }
     }
 

soh/src/overlays/actors/ovl_En_Clear_Tag/z_en_clear_tag.h

@@ -88,7 +88,8 @@ typedef struct EnClearTagEffect {
     /* 0x0058 */ f32 rotationX;
     /* 0x005C */ f32 floorHeight;
     /* 0x0060 */ Vec3f floorTangent;
-} EnClearTagEffect; // size = 0x6C
+    /* 0x006C */ s32 epoch;
+} EnClearTagEffect; // size = 0x70
 
 #define CLEAR_TAG_EFFECT_MAX_COUNT 100
 

soh/src/overlays/actors/ovl_En_Encount2/z_en_encount2.c

@@ -2,6 +2,7 @@
 #include "overlays/actors/ovl_En_Fire_Rock/z_en_fire_rock.h"
 #include "vt.h"
 #include "objects/object_efc_star_field/object_efc_star_field.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_4 | ACTOR_FLAG_5)
 
@@ -303,6 +304,7 @@ void EnEncount2_ParticleInit(EnEncount2* this, Vec3f* particlePos, f32 scale) {
             particle->moveDirection.y = -20.0f;
             particle->moveDirection.z = Rand_CenteredFloat(20.0f);
             particle->isAlive = 1;
+            particle->epoch++;
             break;
         }
     }
@@ -354,6 +356,8 @@ void EnEncount2_ParticleDraw(Actor* thisx, GlobalContext* globalCtx) {
         gSPSegment(POLY_OPA_DISP++, 0x06, globalCtx->objectCtx.status[objBankIndex].segment);
 
         for (i = 0; i < ARRAY_COUNT(this->particles); particle++, i++) {
+            FrameInterpolation_RecordOpenChild(particle, particle->epoch);
+
             if (particle->isAlive) {
                 Matrix_Translate(particle->pos.x, particle->pos.y, particle->pos.z, MTXMODE_NEW);
                 Matrix_RotateX(particle->rot.x * (M_PI / 180.0f), MTXMODE_APPLY);
@@ -366,6 +370,8 @@ void EnEncount2_ParticleDraw(Actor* thisx, GlobalContext* globalCtx) {
                           G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
                 gSPDisplayList(POLY_OPA_DISP++, object_efc_star_field_DL_000DE0);
             }
+
+            FrameInterpolation_RecordCloseChild();
         }
     }
 

soh/src/overlays/actors/ovl_En_Encount2/z_en_encount2.h

@@ -14,7 +14,8 @@ typedef struct {
     /* 0x0010 */ u8 isAlive;
     /* 0x0014 */ Vec3f moveDirection;
     /* 0x0020 */ Vec3f rot;
-} EnEncount2Particle; // size = 0x2C
+    /* 0x002C */ s32 epoch;
+} EnEncount2Particle; // size = 0x30
 
 typedef struct EnEncount2 {
     /* 0x0000 */ Actor actor;

soh/src/overlays/actors/ovl_En_Fd/z_en_fd.c

@@ -7,6 +7,7 @@
 #include "z_en_fd.h"
 #include "objects/gameplay_keep/gameplay_keep.h"
 #include "objects/object_fw/object_fw.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_0 | ACTOR_FLAG_2 | ACTOR_FLAG_4 | ACTOR_FLAG_9)
 
@@ -812,6 +813,7 @@ void EnFd_AddEffect(EnFd* this, u8 type, Vec3f* pos, Vec3f* velocity, Vec3f* acc
             eff->color.a = 255;
             eff->timer = (s16)(Rand_ZeroOne() * 10.0f);
         }
+        eff->epoch++;
         return;
     }
 }
@@ -886,6 +888,8 @@ void EnFd_DrawFlames(EnFd* this, GlobalContext* globalCtx) {
     func_80093D84(globalCtx->state.gfxCtx);
     for (i = 0; i < ARRAY_COUNT(this->effects); i++, eff++) {
         if (eff->type == FD_EFFECT_FLAME) {
+            FrameInterpolation_RecordOpenChild(eff, eff->epoch);
+
             if (!firstDone) {
                 POLY_XLU_DISP = Gfx_CallSetupDL(POLY_XLU_DISP, 0);
                 gSPDisplayList(POLY_XLU_DISP++, gFlareDancerDL_7928);
@@ -902,8 +906,11 @@ void EnFd_DrawFlames(EnFd* this, GlobalContext* globalCtx) {
             idx = eff->timer * (8.0f / eff->initialTimer);
             gSPSegment(POLY_XLU_DISP++, 0x8, SEGMENTED_TO_VIRTUAL(dustTextures[idx]));
             gSPDisplayList(POLY_XLU_DISP++, gFlareDancerSquareParticleDL);
+
+            FrameInterpolation_RecordCloseChild();
         }
     }
+
     CLOSE_DISPS(globalCtx->state.gfxCtx);
 }
 
@@ -919,6 +926,8 @@ void EnFd_DrawDots(EnFd* this, GlobalContext* globalCtx) {
 
     for (i = 0; i < ARRAY_COUNT(this->effects); i++, eff++) {
         if (eff->type == FD_EFFECT_DOT) {
+            FrameInterpolation_RecordOpenChild(eff, eff->epoch);
+
             if (!firstDone) {
                 func_80093D84(globalCtx->state.gfxCtx);
                 gSPDisplayList(POLY_XLU_DISP++, gFlareDancerDL_79F8);
@@ -933,6 +942,8 @@ void EnFd_DrawDots(EnFd* this, GlobalContext* globalCtx) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, gFlareDancerTriangleParticleDL);
+            
+            FrameInterpolation_RecordCloseChild();
         }
     }
 

soh/src/overlays/actors/ovl_En_Fd/z_en_fd.h

@@ -25,6 +25,7 @@ typedef struct {
     /* 0x0014 */ Vec3f pos;
     /* 0x0020 */ Vec3f velocity;
     /* 0x002C */ Vec3f accel;
+                 s32 epoch;
 } EnFdEffect; // size = 0x38
 
 typedef struct EnFd {

soh/src/overlays/actors/ovl_En_Fw/z_en_fw.c

@@ -8,6 +8,7 @@
 #include "objects/object_fw/object_fw.h"
 #include "overlays/actors/ovl_En_Bom/z_en_bom.h"
 #include "objects/gameplay_keep/gameplay_keep.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_0 | ACTOR_FLAG_2 | ACTOR_FLAG_4 | ACTOR_FLAG_9)
 
@@ -421,6 +422,7 @@ void EnFw_AddDust(EnFw* this, Vec3f* initialPos, Vec3f* initialSpeed, Vec3f* acc
             eff->pos = *initialPos;
             eff->accel = *accel;
             eff->velocity = *initialSpeed;
+            eff->epoch++;
             return;
         }
     }
@@ -464,6 +466,8 @@ void EnFw_DrawDust(EnFw* this, GlobalContext* globalCtx) {
     func_80093D84(globalCtx->state.gfxCtx);
 
     for (i = 0; i < ARRAY_COUNT(this->effects); i++, eff++) {
+        FrameInterpolation_RecordOpenChild(eff, eff->epoch);
+
         if (eff->type != 0) {
             if (!firstDone) {
                 POLY_XLU_DISP = Gfx_CallSetupDL(POLY_XLU_DISP, 0U);
@@ -484,6 +488,8 @@ void EnFw_DrawDust(EnFw* this, GlobalContext* globalCtx) {
             gSPSegment(POLY_XLU_DISP++, 0x8, SEGMENTED_TO_VIRTUAL(dustTextures[idx]));
             gSPDisplayList(POLY_XLU_DISP++, gFlareDancerSquareParticleDL);
         }
+
+        FrameInterpolation_RecordCloseChild();
     }
 
     CLOSE_DISPS(globalCtx->state.gfxCtx);

soh/src/overlays/actors/ovl_En_Fw/z_en_fw.h

@@ -19,6 +19,7 @@ typedef struct {
     /* 0x0014 */ Vec3f pos;
     /* 0x0020 */ Vec3f velocity;
     /* 0x002C */ Vec3f accel;
+                 s32 epoch;
 } EnFwEffect;
 
 typedef struct EnFw {

soh/src/overlays/actors/ovl_En_Fz/z_en_fz.c

@@ -1,5 +1,6 @@
 #include "z_en_fz.h"
 #include "objects/object_fz/object_fz.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_0 | ACTOR_FLAG_2 | ACTOR_FLAG_4 | ACTOR_FLAG_10)
 
@@ -756,6 +757,7 @@ void EnFz_SpawnIceSmokeNoFreeze(EnFz* this, Vec3f* pos, Vec3f* velocity, Vec3f*
             iceSmoke->xyScale = xyScale / 1000.0f;
             iceSmoke->primAlpha = 0;
             iceSmoke->timer = 0;
+            iceSmoke->epoch++;
             break;
         }
 
@@ -780,6 +782,7 @@ void EnFz_SpawnIceSmokeFreeze(EnFz* this, Vec3f* pos, Vec3f* velocity, Vec3f* ac
             iceSmoke->primAlpha = primAlpha;
             iceSmoke->timer = 0;
             iceSmoke->isTimerMod8 = isTimerMod8;
+            iceSmoke->epoch++;
             break;
         }
 
@@ -864,6 +867,8 @@ void EnFz_DrawIceSmoke(EnFz* this, GlobalContext* globalCtx) {
     func_80093D84(globalCtx->state.gfxCtx);
 
     for (i = 0; i < ARRAY_COUNT(this->iceSmoke); i++) {
+        FrameInterpolation_RecordOpenChild(iceSmoke, iceSmoke->epoch);
+
         if (iceSmoke->type > 0) {
             gDPPipeSync(POLY_XLU_DISP++);
 
@@ -884,6 +889,8 @@ void EnFz_DrawIceSmoke(EnFz* this, GlobalContext* globalCtx) {
             gSPDisplayList(POLY_XLU_DISP++, SEGMENTED_TO_VIRTUAL(gFreezardSteamDL));
         }
 
+        FrameInterpolation_RecordCloseChild();
+
         iceSmoke++;
     }
 

soh/src/overlays/actors/ovl_En_Fz/z_en_fz.h

@@ -21,6 +21,7 @@ typedef struct {
     /* 0x0030 */ f32 xyScale; // 
     /* 0x0034 */ f32 xyScaleTarget; 
     /* 0x0038 */ u8 isTimerMod8; // conditional, used to run CollisionCheck_SetAT 
+                 s32 epoch;
 } EnFzEffectSsIceSmoke; // size = 0x3C
 
 typedef struct EnFz {

soh/src/overlays/actors/ovl_En_G_Switch/z_en_g_switch.c

@@ -12,6 +12,7 @@
 #include "objects/gameplay_keep/gameplay_keep.h"
 #include "objects/object_tsubo/object_tsubo.h"
 #include "objects/object_gi_rupy/object_gi_rupy.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_4 | ACTOR_FLAG_5)
 
@@ -533,6 +534,7 @@ void EnGSwitch_SpawnEffects(EnGSwitch* this, Vec3f* pos, s16 scale, s16 colorIdx
             f32 pitch;
             f32 yaw;
 
+            effect->epoch++;
             effect->pos = *pos;
             effect->scale = scale;
             effect->colorIdx = colorIdx;
@@ -590,6 +592,7 @@ void EnGSwitch_DrawEffects(EnGSwitch* this, GlobalContext* globalCtx) {
     func_80093D18(globalCtx->state.gfxCtx);
     for (i = 0; i < this->numEffects; i++, effect++) {
         if (effect->flag) {
+            FrameInterpolation_RecordOpenChild(effect, effect->epoch);
             scale = effect->scale / 10000.0f;
             Matrix_Translate(effect->pos.x, effect->pos.y, effect->pos.z, MTXMODE_NEW);
             Matrix_Scale(scale, scale, scale, MTXMODE_APPLY);
@@ -600,6 +603,7 @@ void EnGSwitch_DrawEffects(EnGSwitch* this, GlobalContext* globalCtx) {
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPSegment(POLY_OPA_DISP++, 0x08, SEGMENTED_TO_VIRTUAL(sRupeeTextures[effect->colorIdx]));
             gSPDisplayList(POLY_OPA_DISP++, gRupeeDL);
+            FrameInterpolation_RecordCloseChild();
         }
     }
     CLOSE_DISPS(gfxCtx);

soh/src/overlays/actors/ovl_En_G_Switch/z_en_g_switch.h

@@ -32,6 +32,7 @@ typedef struct {
     /* 0x12 */ u8 flag;
     /* 0x14 */ Vec3f velocity;
     /* 0x20 */ Vec3f rot;
+    s32 epoch;
 } EnGSwitchEffect; // size = 0x2C
 
 typedef struct EnGSwitch {

soh/src/overlays/actors/ovl_En_Gb/z_en_gb.c

@@ -6,6 +6,7 @@
 
 #include "z_en_gb.h"
 #include "objects/object_ps/object_ps.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_0 | ACTOR_FLAG_3)
 
@@ -184,6 +185,7 @@ void EnGb_Init(Actor* thisx, GlobalContext* globalCtx) {
     this->actionTimer = (s16)Rand_ZeroFloat(100.0f) + 100;
 
     for (i = 0; i < ARRAY_COUNT(sCagedSoulPositions); i++) {
+        this->cagedSouls[i].epoch++;
         this->cagedSouls[i].infoIdx = (s32)Rand_ZeroFloat(30.0f) % 3;
         this->cagedSouls[i].unk_14.x = this->cagedSouls[i].translation.x =
             sCagedSoulPositions[i].x + this->dyna.actor.world.pos.x;
@@ -524,6 +526,7 @@ void EnGb_DrawCagedSouls(EnGb* this, GlobalContext* globalCtx) {
     for (i = 0; i < 4; i++) {
         s32 idx = this->cagedSouls[i].infoIdx;
 
+        FrameInterpolation_RecordOpenChild(&this->cagedSouls[i], this->cagedSouls[i].epoch);
         gSPSegment(POLY_XLU_DISP++, 0x08,
                    Gfx_TwoTexScroll(globalCtx->state.gfxCtx, 0, 0, 0, 32, 64, 1, 0,
                                     (u32)(sCagedSoulInfo[idx].timerMultiplier * this->frameTimer) % 512, 32, 128));
@@ -548,6 +551,7 @@ void EnGb_DrawCagedSouls(EnGb* this, GlobalContext* globalCtx) {
         gSPDisplayList(POLY_XLU_DISP++, gPoeSellerCagedSoulDL);
 
         Matrix_Pop();
+        FrameInterpolation_RecordCloseChild();
     }
 
     CLOSE_DISPS(globalCtx->state.gfxCtx);

soh/src/overlays/actors/ovl_En_Gb/z_en_gb.h

@@ -27,6 +27,7 @@ typedef struct {
     /* 0x20 */ f32   unk_20;
     /* 0x24 */ f32   unk_24;
     /* 0x28 */ f32   unk_28;
+    s32 epoch;
 } EnGbCagedSoul; // size = 0x2C
 
 typedef struct EnGb {

soh/src/overlays/actors/ovl_En_Go/z_en_go.c

@@ -2,6 +2,7 @@
 #include "overlays/actors/ovl_En_Bom/z_en_bom.h"
 #include "objects/gameplay_keep/gameplay_keep.h"
 #include "objects/object_oF1d_map/object_oF1d_map.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_0 | ACTOR_FLAG_3 | ACTOR_FLAG_4 | ACTOR_FLAG_5)
 
@@ -1133,11 +1134,9 @@ void EnGo_Draw(Actor* thisx, GlobalContext* globalCtx) {
 
     if (this->actionFunc == EnGo_CurledUp) {
         EnGo_DrawCurledUp(this, globalCtx);
-        return; // needed for match?
     } else if (this->actionFunc == EnGo_GoronLinkRolling || this->actionFunc == func_80A3FEB4 ||
                this->actionFunc == EnGo_StopRolling || this->actionFunc == func_80A3FEB4) {
         EnGo_DrawRolling(this, globalCtx);
-        return; // needed for match?
     } else {
         func_800943C8(globalCtx->state.gfxCtx);
 
@@ -1146,9 +1145,9 @@ void EnGo_Draw(Actor* thisx, GlobalContext* globalCtx) {
 
         SkelAnime_DrawFlexOpa(globalCtx, this->skelAnime.skeleton, this->skelAnime.jointTable,
                               this->skelAnime.dListCount, EnGo_OverrideLimbDraw, EnGo_PostLimbDraw, &this->actor);
-        CLOSE_DISPS(globalCtx->state.gfxCtx);
         EnGo_DrawDust(this, globalCtx);
     }
+    CLOSE_DISPS(globalCtx->state.gfxCtx);
 }
 
 void EnGo_AddDust(EnGo* this, Vec3f* pos, Vec3f* velocity, Vec3f* accel, u8 initialTimer, f32 scale, f32 scaleStep) {
@@ -1158,6 +1157,7 @@ void EnGo_AddDust(EnGo* this, Vec3f* pos, Vec3f* velocity, Vec3f* accel, u8 init
 
     for (i = 0; i < ARRAY_COUNT(this->dustEffects); i++, dustEffect++) {
         if (dustEffect->type != 1) {
+            dustEffect->epoch++;
             dustEffect->scale = scale;
             dustEffect->scaleStep = scaleStep;
             timer = initialTimer;
@@ -1218,6 +1218,7 @@ void EnGo_DrawDust(EnGo* this, GlobalContext* globalCtx) {
                 firstDone = true;
             }
 
+            FrameInterpolation_RecordOpenChild(dustEffect, dustEffect->epoch);
             alpha = dustEffect->timer * (255.0f / dustEffect->initialTimer);
             gDPSetPrimColor(POLY_XLU_DISP++, 0, 0, 170, 130, 90, alpha);
             gDPPipeSync(POLY_XLU_DISP++);
@@ -1230,6 +1231,7 @@ void EnGo_DrawDust(EnGo* this, GlobalContext* globalCtx) {
             index = dustEffect->timer * (8.0f / dustEffect->initialTimer);
             gSPSegment(POLY_XLU_DISP++, 0x08, SEGMENTED_TO_VIRTUAL(dustTex[index]));
             gSPDisplayList(POLY_XLU_DISP++, gGoronDL_00FD50);
+            FrameInterpolation_RecordCloseChild();
         }
     }
     CLOSE_DISPS(globalCtx->state.gfxCtx);

soh/src/overlays/actors/ovl_En_Go/z_en_go.h

@@ -34,6 +34,7 @@ typedef struct {
     /* 0x0014 */ Vec3f pos;
     /* 0x0020 */ Vec3f velocity;
     /* 0x002C */ Vec3f accel;
+    s32 epoch;
 } EnGoEffect; // size = 0x38
 
 typedef struct EnGo {

soh/src/overlays/actors/ovl_En_Go2/z_en_go2.c

@@ -2,6 +2,7 @@
 #include "overlays/actors/ovl_En_Bom/z_en_bom.h"
 #include "objects/gameplay_keep/gameplay_keep.h"
 #include "objects/object_oF1d_map/object_oF1d_map.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_0 | ACTOR_FLAG_3 | ACTOR_FLAG_4 | ACTOR_FLAG_5)
 
@@ -176,6 +177,7 @@ void EnGo2_AddDust(EnGo2* this, Vec3f* pos, Vec3f* velocity, Vec3f* accel, u8 in
 
     for (i = 0; i < ARRAY_COUNT(this->dustEffects); i++, dustEffect++) {
         if (dustEffect->type != 1) {
+            dustEffect->epoch++;
             dustEffect->scale = scale;
             dustEffect->scaleStep = scaleStep;
             timer = initialTimer;
@@ -236,6 +238,7 @@ void EnGo2_DrawDust(EnGo2* this, GlobalContext* globalCtx) {
                 firstDone = true;
             }
 
+            FrameInterpolation_RecordOpenChild(dustEffect, dustEffect->epoch);
             alpha = dustEffect->timer * (255.0f / dustEffect->initialTimer);
             gDPSetPrimColor(POLY_XLU_DISP++, 0, 0, 170, 130, 90, alpha);
             gDPPipeSync(POLY_XLU_DISP++);
@@ -247,6 +250,7 @@ void EnGo2_DrawDust(EnGo2* this, GlobalContext* globalCtx) {
             index = dustEffect->timer * (8.0f / dustEffect->initialTimer);
             gSPSegment(POLY_XLU_DISP++, 0x08, SEGMENTED_TO_VIRTUAL(sDustTex[index]));
             gSPDisplayList(POLY_XLU_DISP++, gGoronDL_00FD50);
+            FrameInterpolation_RecordCloseChild();
         }
     }
 

soh/src/overlays/actors/ovl_En_Niw/z_en_niw.c

@@ -8,6 +8,7 @@
 #include "objects/object_niw/object_niw.h"
 #include "overlays/actors/ovl_En_Attack_Niw/z_en_attack_niw.h"
 #include "vt.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_4 | ACTOR_FLAG_23)
 
@@ -1145,6 +1146,7 @@ void EnNiw_FeatherSpawn(EnNiw* this, Vec3f* pos, Vec3f* vel, Vec3f* accel, f32 s
 
     for (i = 0; i < ARRAY_COUNT(this->feathers); i++, feather++) {
         if (feather->type == 0) {
+            feather->epoch++;
             feather->type = 1;
             feather->pos = *pos;
             feather->vel = *vel;
@@ -1202,6 +1204,7 @@ void EnNiw_FeatherDraw(EnNiw* this, GlobalContext* globalCtx) {
 
     for (i = 0; i < ARRAY_COUNT(this->feathers); i++, feather++) {
         if (feather->type == 1) {
+            FrameInterpolation_RecordOpenChild(feather, feather->epoch);
             if (!flag) {
                 gSPDisplayList(POLY_XLU_DISP++, gCuccoParticleAppearDL);
                 flag++;
@@ -1214,6 +1217,7 @@ void EnNiw_FeatherDraw(EnNiw* this, GlobalContext* globalCtx) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, gCuccoParticleAliveDL);
+            FrameInterpolation_RecordCloseChild();
         }
     }
 

soh/src/overlays/actors/ovl_En_Niw/z_en_niw.h

@@ -18,6 +18,7 @@ typedef struct {
     /* 0x002C */ f32 scale;
     /* 0x0030 */ f32 unk_30;
     /* 0x0034 */ u8 timer;
+    s32 epoch;
 } EnNiwFeather; // size = 0x0038
 
 typedef struct EnNiw {

soh/src/overlays/actors/ovl_En_Nwc/z_en_nwc.c

@@ -6,6 +6,7 @@
 
 #include "z_en_nwc.h"
 #include "objects/object_nwc/object_nwc.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_4 | ACTOR_FLAG_5)
 
@@ -170,6 +171,7 @@ void EnNwc_DrawChicks(EnNwc* this, GlobalContext* globalCtx) {
         if (chick->type != CHICK_NONE) {
             Mtx* mtx;
 
+            FrameInterpolation_RecordOpenChild(chick, chick->epoch);
             Matrix_SetTranslateRotateYXZ(chick->pos.x, chick->pos.y + chick->height, chick->pos.z, &chick->rot);
             Matrix_Scale(0.01f, 0.01f, 0.01f, MTXMODE_APPLY);
             mtx = MATRIX_NEWMTX(globalCtx->state.gfxCtx);
@@ -180,6 +182,7 @@ void EnNwc_DrawChicks(EnNwc* this, GlobalContext* globalCtx) {
             gSPDisplayList(dList2++, gCuccoChickEyesDL);
             gSPMatrix(dList3++, mtx, G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(dList3++, gCuccoChickBeakDL);
+            FrameInterpolation_RecordCloseChild();
         }
     }
 
@@ -190,6 +193,7 @@ void EnNwc_DrawChicks(EnNwc* this, GlobalContext* globalCtx) {
 
     for (i = 0; i < this->count; i++, chick++) {
         if ((chick->type != CHICK_NONE) && (chick->floorPoly != NULL)) {
+            FrameInterpolation_RecordOpenChild(chick, chick->epoch * 25);
             func_80038A28(chick->floorPoly, chick->pos.x, chick->floorY, chick->pos.z, &floorMat);
             Matrix_Put(&floorMat);
             Matrix_RotateY(chick->rot.y * (M_PI / 0x8000), MTXMODE_APPLY);
@@ -197,6 +201,7 @@ void EnNwc_DrawChicks(EnNwc* this, GlobalContext* globalCtx) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, gCuccoChickShadowDL);
+            FrameInterpolation_RecordCloseChild();
         }
     }
     CLOSE_DISPS(globalCtx->state.gfxCtx);
@@ -220,6 +225,7 @@ void EnNwc_Init(Actor* thisx, GlobalContext* globalCtx) {
     this->count = 16;
     chick = this->chicks;
     for (i = 0; i < this->count; i++, chick++) {
+        chick->epoch++;
         chick->type = CHICK_NORMAL;
         chick->pos.x = thisx->world.pos.x + ((Rand_ZeroOne() * 100.0f) - 50.0f);
         chick->pos.y = thisx->world.pos.y + 20.0f;

soh/src/overlays/actors/ovl_En_Nwc/z_en_nwc.h

@@ -23,6 +23,7 @@ typedef struct EnNwcChick {
     /* 0x36 */ u16 height;
     /* 0x38 */ CollisionPoly* floorPoly;
     /* 0x44 */ char unk_3C[0x20]; 
+    s32 epoch;
 } EnNwcChick; // size = 0x5C
 
 typedef struct EnNwc {

soh/src/overlays/actors/ovl_En_Ny/z_en_ny.c

@@ -1,5 +1,6 @@
 #include "z_en_ny.h"
 #include "objects/object_ny/object_ny.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_0 | ACTOR_FLAG_2)
 
@@ -107,6 +108,7 @@ static InitChainEntry sInitChain[] = {
 void EnNy_Init(Actor* thisx, GlobalContext* globalCtx) {
     EnNy* this = (EnNy*)thisx;
 
+    this->epoch++;
     Actor_ProcessInitChain(&this->actor, sInitChain);
     this->actor.colChkInfo.damageTable = &sDamageTable;
     this->actor.colChkInfo.health = 2;
@@ -577,6 +579,7 @@ void EnNy_DrawDeathEffect(Actor* thisx, GlobalContext* globalCtx) {
     gDPPipeSync(POLY_OPA_DISP++);
     for (i = 0; i < 8; i++) {
         if (this->timer < (i + 22)) {
+            FrameInterpolation_RecordOpenChild(this, this->epoch + i * 25);
             temp = &this->unk_1F8[i];
             Matrix_Translate(temp->x, temp->y, temp->z, MTXMODE_NEW);
             scale = this->actor.scale.x * 0.4f * (1.0f + (i * 0.04f));
@@ -584,6 +587,7 @@ void EnNy_DrawDeathEffect(Actor* thisx, GlobalContext* globalCtx) {
             gSPMatrix(POLY_OPA_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_OPA_DISP++, gEnNyRockBodyDL);
+            FrameInterpolation_RecordCloseChild();
         }
     }
     CLOSE_DISPS(globalCtx->state.gfxCtx);

soh/src/overlays/actors/ovl_En_Ny/z_en_ny.h

@@ -30,6 +30,7 @@ typedef struct EnNy {
     /* 0x01F0 */ f32 unk_1F0;
     /* 0x01F4 */ f32 unk_1F4;
     /* 0x01F8 */ Vec3f unk_1F8[16];
+    s32 epoch;
 } EnNy; // size = 0x02B8
 
 #endif

soh/src/overlays/actors/ovl_En_Po_Sisters/z_en_po_sisters.c

@@ -7,6 +7,7 @@
 #include "z_en_po_sisters.h"
 #include "objects/gameplay_keep/gameplay_keep.h"
 #include "objects/object_po_sisters/object_po_sisters.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_0 | ACTOR_FLAG_2 | ACTOR_FLAG_4 | ACTOR_FLAG_9 | ACTOR_FLAG_12 | ACTOR_FLAG_14)
 
@@ -179,6 +180,8 @@ void EnPoSisters_Init(Actor* thisx, GlobalContext* globalCtx) {
     EnPoSisters* this = (EnPoSisters*)thisx;
     s32 pad;
 
+    this->epoch++;
+
     // Skip Poe Intro Cutscene
     if (gSaveContext.n64ddFlag && thisx->params == 4124) {
         Flags_SetSwitch(globalCtx, 0x1B);
@@ -1413,6 +1416,7 @@ void EnPoSisters_Draw(Actor* thisx, GlobalContext* globalCtx) {
             this->actionFunc != func_80ADBEE8) {
             phi_s5 = -i * 31 + 248;
         }
+        FrameInterpolation_RecordOpenChild(this, this->epoch + i * 25);
         gDPPipeSync(POLY_XLU_DISP++);
         gDPSetPrimColor(POLY_XLU_DISP++, 0x80, 0x80, temp_s7->r, temp_s7->g, temp_s7->b, phi_s5);
         Matrix_Translate(this->unk_234[i].x, this->unk_234[i].y, this->unk_234[i].z, MTXMODE_NEW);
@@ -1425,6 +1429,7 @@ void EnPoSisters_Draw(Actor* thisx, GlobalContext* globalCtx) {
         gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                   G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
         gSPDisplayList(POLY_XLU_DISP++, gEffFire1DL);
+        FrameInterpolation_RecordCloseChild();
     }
     CLOSE_DISPS(globalCtx->state.gfxCtx);
 }

soh/src/overlays/actors/ovl_En_Po_Sisters/z_en_po_sisters.h

@@ -29,6 +29,7 @@ typedef struct EnPoSisters {
     /* 0x029C */ LightInfo lightInfo;
     /* 0x02AC */ ColliderCylinder collider;
     /* 0x02F8 */ MtxF unk_2F8;
+    s32 epoch;
 } EnPoSisters; // size = 0x0338
 
 #endif

soh/src/overlays/actors/ovl_En_Syateki_Niw/z_en_syateki_niw.c

@@ -7,6 +7,7 @@
 #include "z_en_syateki_niw.h"
 #include "objects/object_niw/object_niw.h"
 #include "vt.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS ACTOR_FLAG_4
 
@@ -713,6 +714,7 @@ void func_80B131B8(EnSyatekiNiw* this, Vec3f* arg1, Vec3f* arg2, Vec3f* arg3, f3
 
     for (i = 0; i < 5; i++, ptr++) {
         if (ptr->unk_00 == 0) {
+            ptr->epoch++;
             ptr->unk_00 = 1;
             ptr->unk_04 = *arg1;
             ptr->unk_10 = *arg2;
@@ -773,6 +775,7 @@ void func_80B13464(EnSyatekiNiw* this, GlobalContext* globalCtx) {
                 flag++;
             }
 
+            FrameInterpolation_RecordOpenChild(ptr, ptr->epoch);
             Matrix_Translate(ptr->unk_04.x, ptr->unk_04.y, ptr->unk_04.z, MTXMODE_NEW);
             Matrix_ReplaceRotation(&globalCtx->billboardMtxF);
             Matrix_Scale(ptr->unk_2C, ptr->unk_2C, 1.0f, MTXMODE_APPLY);
@@ -782,6 +785,7 @@ void func_80B13464(EnSyatekiNiw* this, GlobalContext* globalCtx) {
             gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(gfxCtx),
                       G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
             gSPDisplayList(POLY_XLU_DISP++, gCuccoParticleAliveDL);
+            FrameInterpolation_RecordCloseChild();
         }
     }
 

soh/src/overlays/actors/ovl_En_Syateki_Niw/z_en_syateki_niw.h

@@ -18,6 +18,7 @@ typedef struct {
     /* 0x2C */ f32   unk_2C;
     /* 0x30 */ f32   unk_30;
     /* 0x34 */ u8    unk_34;
+    s32 epoch;
 } EnSyatekiNiw_1; // size = 0x38
 
 typedef struct EnSyatekiNiw {

soh/src/overlays/actors/ovl_En_Tk/z_en_tk.c

@@ -7,6 +7,7 @@
 #include "z_en_tk.h"
 #include "objects/gameplay_keep/gameplay_keep.h"
 #include "objects/object_tk/object_tk.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_0 | ACTOR_FLAG_3)
 #define COLLECTFLAG_GRAVEDIGGING_HEART_PIECE 0x19
@@ -43,6 +44,7 @@ void EnTkEff_Create(EnTk* this, Vec3f* pos, Vec3f* speed, Vec3f* accel, u8 durat
 
     for (i = 0; i < ARRAY_COUNT(this->eff); i++) {
         if (eff->active != 1) {
+            eff->epoch++;
             eff->size = size;
             eff->growth = growth;
             eff->timeTotal = eff->timeLeft = duration;
@@ -107,6 +109,7 @@ void EnTkEff_Draw(EnTk* this, GlobalContext* globalCtx) {
                 gfxSetup = 1;
             }
 
+            FrameInterpolation_RecordOpenChild(eff, eff->epoch);
             alpha = eff->timeLeft * (255.0f / eff->timeTotal);
             gDPSetPrimColor(POLY_XLU_DISP++, 0, 0, 170, 130, 90, alpha);
 
@@ -121,6 +124,7 @@ void EnTkEff_Draw(EnTk* this, GlobalContext* globalCtx) {
             gSPSegment(POLY_XLU_DISP++, 0x08, SEGMENTED_TO_VIRTUAL(dustTextures[imageIdx]));
 
             gSPDisplayList(POLY_XLU_DISP++, gDampeEff2DL);
+            FrameInterpolation_RecordCloseChild();
         }
         eff++;
     }

soh/src/overlays/actors/ovl_En_Tk/z_en_tk.h

@@ -17,6 +17,7 @@ typedef struct EnTkEff {
     /* 0x0014 */ Vec3f      pos;
     /* 0x0020 */ Vec3f      speed;
     /* 0x002C */ Vec3f      accel;
+    s32 epoch;
 } EnTkEff; // size = 0x0038
 
 struct EnTk;

soh/src/overlays/actors/ovl_En_Viewer/z_en_viewer.c

@@ -14,6 +14,7 @@
 #include "objects/object_gndd/object_gndd.h"
 #include "objects/object_ganon/object_ganon.h"
 #include "objects/object_opening_demo1/object_opening_demo1.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS ACTOR_FLAG_4
 
@@ -793,6 +794,7 @@ void EnViewer_InitFireEffect(EnViewer* this, GlobalContext* globalCtx, s16 i) {
         eff->endPos.y = -420.0f;
         eff->endPos.z = -400.0f;
         eff->scale = (Rand_ZeroOne() * 5.0f + 12.0f) * 0.001f;
+        eff->epoch++;
     } else {
         eff = &this->fireEffects[i];
         eff->startPos.x = -100.0f;
@@ -802,6 +804,7 @@ void EnViewer_InitFireEffect(EnViewer* this, GlobalContext* globalCtx, s16 i) {
         eff->endPos.y = -420.0f;
         eff->endPos.z = -400.0f;
         eff->scale = (Rand_ZeroOne() * 5.0f + 12.0f) * 0.001f;
+        eff->epoch++;
     }
     if (this) {}
 }
@@ -843,6 +846,7 @@ void EnViewer_DrawFireEffects(EnViewer* this2, GlobalContext* globalCtx) {
                 break;
         }
 
+        FrameInterpolation_RecordOpenChild(&this->fireEffects[i], this->fireEffects[i].epoch);
         func_80093D84(globalCtx->state.gfxCtx);
         Matrix_Translate(this->fireEffects[i].pos.x, this->fireEffects[i].pos.y, this->fireEffects[i].pos.z,
                          MTXMODE_NEW);
@@ -856,6 +860,7 @@ void EnViewer_DrawFireEffects(EnViewer* this2, GlobalContext* globalCtx) {
                   G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
         gSPMatrix(POLY_XLU_DISP++, SEG_ADDR(1, 0), G_MTX_NOPUSH | G_MTX_MUL | G_MTX_MODELVIEW);
         gSPDisplayList(POLY_XLU_DISP++, gEffFire1DL);
+        FrameInterpolation_RecordCloseChild();
     }
     CLOSE_DISPS(globalCtx->state.gfxCtx);
 }

soh/src/overlays/actors/ovl_En_Viewer/z_en_viewer.h

@@ -56,6 +56,7 @@ typedef struct {
     /* 0x28 */ f32 scale;
     /* 0x2C */ f32 lerpFactor;
     /* 0x30 */ u8 state;
+    s32 epoch;
 } EnViewerFireEffect; // size = 0x34
 
 typedef struct EnViewer {

soh/src/overlays/actors/ovl_Fishing/z_fishing.c

@@ -90,6 +90,7 @@ typedef struct {
     /* 0x32 */ s16 timer;
     /* 0x34 */ u8 shouldDraw;
     /* 0x38 */ f32 drawDistance;
+    s32 epoch;
 } FishingProp; // size = 0x3C
 
 typedef enum {
@@ -115,6 +116,7 @@ typedef struct {
     /* 0x40 */ s16 unk_40;
     /* 0x42 */ s16 unk_42;
     /* 0x44 */ u8 shouldDraw;
+    s32 epoch;
 } FishingGroupFish; // size = 0x48
 
 #define LINE_SEG_COUNT 200
@@ -764,6 +766,7 @@ void Fishing_InitPondProps(Fishing* this, GlobalContext* globalCtx) {
             break;
         }
 
+        prop->epoch++;
         prop->type = sPondPropInits[i].type;
         prop->pos.x = sPondPropInits[i].pos.x;
         prop->pos.y = sPondPropInits[i].pos.y;
@@ -929,6 +932,8 @@ void Fishing_Init(Actor* thisx, GlobalContext* globalCtx2) {
         for (i = 0; i < GROUP_FISH_COUNT; i++) {
             FishingGroupFish* fish = &sGroupFishes[i];
 
+            fish->epoch++;
+
             fish->type = FS_GROUP_FISH_NORMAL;
 
             if (i <= 20) {
@@ -1761,6 +1766,8 @@ static f32 sSinkingLureSizes[] = {
 void Fishing_DrawSinkingLure(GlobalContext* globalCtx) {
     s16 i;
     f32 scale;
+    static s32 epoch = 0;
+    epoch++;
 
     OPEN_DISPS(globalCtx->state.gfxCtx);
 
@@ -1773,6 +1780,7 @@ void Fishing_DrawSinkingLure(GlobalContext* globalCtx) {
 
         for (i = SINKING_LURE_SEG_COUNT - 1; i >= 0; i--) {
             if ((i + D_80B7FEA0) < SINKING_LURE_SEG_COUNT) {
+                FrameInterpolation_RecordOpenChild("Fishing Lures 1", epoch + i * 25);
                 Matrix_Translate(sSinkingLurePos[i].x, sSinkingLurePos[i].y, sSinkingLurePos[i].z, MTXMODE_NEW);
                 scale = sSinkingLureSizes[i + D_80B7FEA0] * 0.04f;
                 Matrix_Scale(scale, scale, scale, MTXMODE_APPLY);
@@ -1781,6 +1789,7 @@ void Fishing_DrawSinkingLure(GlobalContext* globalCtx) {
                 gSPMatrix(POLY_OPA_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                           G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
                 gSPDisplayList(POLY_OPA_DISP++, gFishingSinkingLureSegmentModelDL);
+                FrameInterpolation_RecordCloseChild();
             }
         }
     } else {
@@ -1790,6 +1799,7 @@ void Fishing_DrawSinkingLure(GlobalContext* globalCtx) {
 
         for (i = SINKING_LURE_SEG_COUNT - 1; i >= 0; i--) {
             if ((i + D_80B7FEA0) < SINKING_LURE_SEG_COUNT) {
+                FrameInterpolation_RecordOpenChild("Fishing Lures 2", epoch + i * 25);
                 Matrix_Translate(sSinkingLurePos[i].x, sSinkingLurePos[i].y, sSinkingLurePos[i].z, MTXMODE_NEW);
                 scale = sSinkingLureSizes[i + D_80B7FEA0] * 0.04f;
                 Matrix_Scale(scale, scale, scale, MTXMODE_APPLY);
@@ -1798,6 +1808,7 @@ void Fishing_DrawSinkingLure(GlobalContext* globalCtx) {
                 gSPMatrix(POLY_XLU_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                           G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
                 gSPDisplayList(POLY_XLU_DISP++, gFishingSinkingLureSegmentModelDL);
+                FrameInterpolation_RecordCloseChild();
             }
         }
     }
@@ -4451,7 +4462,7 @@ void Fishing_DrawPondProps(GlobalContext* globalCtx) {
             }
 
             if (prop->shouldDraw) {
-                FrameInterpolation_RecordOpenChild(prop, 0);
+                FrameInterpolation_RecordOpenChild(prop, prop->epoch);
                 Matrix_Translate(prop->pos.x, prop->pos.y, prop->pos.z, MTXMODE_NEW);
                 Matrix_Scale(prop->scale, prop->scale, prop->scale, MTXMODE_APPLY);
                 Matrix_RotateY(prop->rotY, MTXMODE_APPLY);
@@ -4478,7 +4489,7 @@ void Fishing_DrawPondProps(GlobalContext* globalCtx) {
             }
 
             if (prop->shouldDraw) {
-                FrameInterpolation_RecordOpenChild(prop, 0);
+                FrameInterpolation_RecordOpenChild(prop, prop->epoch);
                 Matrix_Translate(prop->pos.x, prop->pos.y, prop->pos.z, MTXMODE_NEW);
                 Matrix_Scale(prop->scale, prop->scale, prop->scale, MTXMODE_APPLY);
 
@@ -4502,7 +4513,7 @@ void Fishing_DrawPondProps(GlobalContext* globalCtx) {
             }
 
             if (prop->shouldDraw) {
-                FrameInterpolation_RecordOpenChild(prop, 0);
+                FrameInterpolation_RecordOpenChild(prop, prop->epoch);
                 Matrix_Translate(prop->pos.x, prop->pos.y, prop->pos.z, MTXMODE_NEW);
                 Matrix_Scale(prop->scale, 1.0f, prop->scale, MTXMODE_APPLY);
                 Matrix_RotateY(prop->lilyPadAngle * (M_PI / 32768), MTXMODE_APPLY);
@@ -4529,7 +4540,7 @@ void Fishing_DrawPondProps(GlobalContext* globalCtx) {
             }
 
             if (prop->shouldDraw) {
-                FrameInterpolation_RecordOpenChild(prop, 0);
+                FrameInterpolation_RecordOpenChild(prop, prop->epoch);
                 Matrix_Translate(prop->pos.x, prop->pos.y, prop->pos.z, MTXMODE_NEW);
                 Matrix_Scale(prop->scale, prop->scale, prop->scale, MTXMODE_APPLY);
                 Matrix_RotateY(prop->rotY, MTXMODE_APPLY);
@@ -4759,6 +4770,7 @@ void Fishing_DrawGroupFishes(GlobalContext* globalCtx) {
             }
 
             if (fish->shouldDraw) {
+                FrameInterpolation_RecordOpenChild(fish, fish->epoch);
                 Matrix_Translate(fish->pos.x, fish->pos.y, fish->pos.z, MTXMODE_NEW);
                 Matrix_RotateY(((f32)fish->unk_3E * M_PI) / 32768.0f, MTXMODE_APPLY);
                 Matrix_RotateX((-(f32)fish->unk_3C * M_PI) / 32768.0f, MTXMODE_APPLY);
@@ -4767,6 +4779,7 @@ void Fishing_DrawGroupFishes(GlobalContext* globalCtx) {
                 gSPMatrix(POLY_OPA_DISP++, MATRIX_NEWMTX(globalCtx->state.gfxCtx),
                           G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
                 gSPDisplayList(POLY_OPA_DISP++, gFishingGroupFishModelDL);
+                FrameInterpolation_RecordCloseChild();
             }
         }
         fish++;

soh/src/overlays/actors/ovl_Mir_Ray/z_mir_ray.c

@@ -6,6 +6,7 @@
 
 #include "z_mir_ray.h"
 #include "objects/object_mir_ray/object_mir_ray.h"
+#include "soh/frame_interpolation.h"
 
 #define FLAGS (ACTOR_FLAG_4 | ACTOR_FLAG_5)
 
@@ -481,6 +482,8 @@ void MirRay_Draw(Actor* thisx, GlobalContext* globalCtx) {
     s32 i;
     MirRayShieldReflection reflection[6];
     s32 temp;
+    static s32 epoch = 0;
+    epoch++;
 
     this->reflectIntensity = 0.0f;
     if ((D_80B8E670 == 0) && !this->unLit && Player_HasMirrorShieldSetToDraw(globalCtx)) {
@@ -511,6 +514,7 @@ void MirRay_Draw(Actor* thisx, GlobalContext* globalCtx) {
             }
             for (i = 0; i < 6; i++) {
                 if (reflection[i].reflectionPoly != NULL) {
+                    FrameInterpolation_RecordOpenChild(&reflection[i], epoch + i * 25);
                     Matrix_Translate(reflection[i].pos.x, reflection[i].pos.y, reflection[i].pos.z, MTXMODE_NEW);
                     Matrix_Scale(0.01f, 0.01f, 0.01f, MTXMODE_APPLY);
                     Matrix_Mult(&reflection[i].mtx, MTXMODE_APPLY);
@@ -519,6 +523,7 @@ void MirRay_Draw(Actor* thisx, GlobalContext* globalCtx) {
                     gDPSetRenderMode(POLY_XLU_DISP++, G_RM_FOG_SHADE_A, G_RM_AA_ZB_XLU_DECAL2);
                     gDPSetPrimColor(POLY_XLU_DISP++, 0, 0, 255, 255, 150, reflection[0].opacity);
                     gSPDisplayList(POLY_XLU_DISP++, gShieldBeamImageDL);
+                    FrameInterpolation_RecordCloseChild();
                 }
             }
 

soh/src/overlays/actors/ovl_Object_Kankyo/z_object_kankyo.c

@@ -924,6 +924,7 @@ void ObjectKankyo_DrawBeams(ObjectKankyo* this2, GlobalContext* globalCtx2) {
     if (this->requiredObjectLoaded) {
         for (i = 0; i < 6; i++) {
             if (this->effects[i].size > 0.001f) {
+                FrameInterpolation_RecordOpenChild(&this->effects[i], this->effects[i].epoch);
                 Matrix_Translate(beamX[i], beamY[i], beamZ[i], MTXMODE_NEW);
                 Matrix_RotateY(DEG_TO_RAD(beamYaw[i]), MTXMODE_APPLY);
                 Matrix_RotateX(DEG_TO_RAD(beamPitch[i]), MTXMODE_APPLY);
@@ -940,6 +941,7 @@ void ObjectKankyo_DrawBeams(ObjectKankyo* this2, GlobalContext* globalCtx2) {
                                             globalCtx->state.frames * 10, 32, 64, 1, globalCtx->state.frames * 5,
                                             globalCtx->state.frames * 10, 32, 64));
                 gSPDisplayList(POLY_XLU_DISP++, gDemoKekkaiDL_005FF0);
+                FrameInterpolation_RecordCloseChild();
             }
         }
     }

soh/src/overlays/effects/ovl_Effect_Ss_Bomb2/z_eff_ss_bomb2.c

@@ -6,6 +6,7 @@
 
 #include "z_eff_ss_bomb2.h"
 #include "objects/gameplay_keep/gameplay_keep.h"
+#include "soh/frame_interpolation.h"
 
 #define rScale regs[0]
 #define rTexIdx regs[1]
@@ -54,6 +55,7 @@ u32 EffectSsBomb2_Init(GlobalContext* globalCtx, u32 index, EffectSs* this, void
     this->rEnvColorR = 0;
     this->rEnvColorG = 0;
     this->rEnvColorB = 200;
+    this->epoch++;
 
     return 1;
 }
@@ -144,6 +146,7 @@ void EffectSsBomb2_DrawLayered(GlobalContext* globalCtx, u32 index, EffectSs* th
             Matrix_Put(&mtx2F);
 
             for (i = 1; i >= 0; i--) {
+                FrameInterpolation_RecordOpenChild(this, this->epoch + i * 25);
                 Matrix_Translate(0.0f, 0.0f, depth, MTXMODE_APPLY);
                 Matrix_RotateZ((this->life * 0.02f) + 180.0f, MTXMODE_APPLY);
                 Matrix_Scale(layer2Scale, layer2Scale, layer2Scale, MTXMODE_APPLY);
@@ -151,6 +154,7 @@ void EffectSsBomb2_DrawLayered(GlobalContext* globalCtx, u32 index, EffectSs* th
                           G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
                 gSPDisplayList(POLY_XLU_DISP++, gEffBombExplosion3DL);
                 layer2Scale -= 0.15f;
+                FrameInterpolation_RecordCloseChild();
             }
         }
     }

soh/src/overlays/effects/ovl_Effect_Ss_Bomb2/z_eff_ss_bomb2.h

@@ -11,6 +11,7 @@ typedef struct {
     /* 0x24 */ s16 scale;
     /* 0x26 */ s16 scaleStep;
     /* 0x28 */ u8 drawMode;
+    /* 0x29 */ s32 epoch;
 } EffectSsBomb2InitParams; // size = 0x30
 
 #endif