[[Category RSC]]
Work in progress.

This page refers to .ob3, a custom format for 3D models created by Jagex. It is used by the RuneScape Classic engine.

<pre>
[Unsigned Short] vertex_count
[Unsigned Short] face_count

for (int i = 0; i < vertex_count; i++)
  [Signed Short] vert_x
for (int i = 0; i < vertex_count; i++)
  [Signed Short] vert_z
for (int i = 0; i < vertex_count; i++)
  [Signed Short] vert_y

for (int i = 0; i < face_count; i++)
  [Unsigned Byte] face_vert_count
for (int i = 0; i < face_count; i++)
  [Signed Short] face_back
for (int i = 0; i < face_count; i++)
  [Signed Short] face_front
for (int i = 0; i < face_count; i++)
  [Unsigned Byte] Boolean. Gourad shading?

for (int i = 0; i < face_count; i++) {
  for (int j = 0; j < face_vert_count[i]; j++) {
    if (vertex_count < 256)
      [Unsigned Byte] Unknown
    else
      [Unsigned Short] Unknown
  }
}</pre>

== '''Face sides''' ==
A '''negative''' face_back or face_front value indicates a '''solid colour''', whereas a '''positive''' value indicates a '''texture'''.

== '''Shading''' ==
The hex value '''0xbc614e''' (or 12345678 in decimal) is believed to be used as a trigger for Gouraud shading.