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Correct bug

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This commit is contained in:
Miloslav Číž 2020-08-22 19:59:43 +02:00
parent 462b5e4524
commit 68285eebfa
2 changed files with 18 additions and 15 deletions
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33
raycastlib.h
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@ -26,7 +26,7 @@
author: Miloslav "drummyfish" Ciz
license: CC0 1.0
version: 0.907
version: 0.908
*/
#include <stdint.h>
@ -825,18 +825,21 @@ void RCL_castRayMultiHit(RCL_Ray ray, RCL_ArrayFunction arrayFunc,
#if RCL_RECTILINEAR
/* Here we compute the fish eye corrected distance (perpendicular to
the projection plane) as the Euclidean distance divided by the length
of the ray direction vector. This can be computed without actually
computing Euclidean distances as a hypothenuse A (distance) divided
by hypothenuse B (length) is equal to leg A (distance along one axis)
divided by leg B (length along the same axis). */
the projection plane) as the Euclidean distance (of hit from camera
position) divided by the length of the ray direction vector. This can
be computed without actually computing Euclidean distances as a
hypothenuse A (distance) divided by hypothenuse B (length) is equal to
leg A (distance along principal axis) divided by leg B (length along
the same principal axis). */
h.distance =
(((h.position.x - ray.start.x) / 4) *
RCL_UNITS_PER_SQUARE * rayDirXRecip)
/ (RECIP_SCALE / 4);
#define CORRECT(dir1,dir2)\
RCL_Unit tmp = diff / 4; /* 4 to prevent overflow */ \
h.distance = ((tmp / 8) != 0) ? /* prevent a bug with small dists */ \
((tmp * RCL_UNITS_PER_SQUARE * rayDir ## dir1 ## Recip) / (RECIP_SCALE / 4)):\
RCL_abs(h.position.dir2 - ray.start.dir2);
CORRECT(X,y)
// ^ / 4 is here to prevent overflow
#endif
}
else
@ -856,10 +859,10 @@ void RCL_castRayMultiHit(RCL_Ray ray, RCL_ArrayFunction arrayFunc,
ray.start.x + (ray.direction.x * diff * rayDirYRecip) / RECIP_SCALE;
#if RCL_RECTILINEAR
h.distance =
(((h.position.y - ray.start.y) / 4) *
RCL_UNITS_PER_SQUARE * rayDirYRecip)
/ (RECIP_SCALE / 4);
CORRECT(Y,x) // same as above but for different axis
#undef CORRECT
// ^ / 4 is here to prevent overflow
#endif