3d - How to handle COLLADA indices? -



3d - How to handle COLLADA indices? -

i wrote simple reader collada file format, , seems work ok. now, have blender-exported cube mesh edge-splitted , triangulated, should have 12 triangles (2 per face), 24 vertices (4 per face) , 36 indices (6 per face). mesh has normal info , uv maps.

the collada file has 24 vertices, 12 normals, , 36 uvs, assume normals per-triangle , uvs per-index. polylist count triangles 12, correct, , vcount has twelve '3's, that's right too. now, <p> index list has 108 entries, 0, 3, 6 etc. vertex indices, 1, 4, 7 etc. normal indices , 2, 5, 8 etc. uv indices.

i have internal struct vertices, consists of position (vec3), normal (vec3) , uv coordinate (vec2). draw meshes, utilize opengl's vertex buffers, , have separate list of indices.

the thing is, shouldn't have 24 vertices after loading mesh? 108 entries in <p> translates 36 vertices. what's problem here indices?

i may missing simple here, can't see it.

the collada file here.

okay, found solution, had clear mind simple plane. every face triangle, final count of vertices 3 times count described in polylist's count attribute. so, cube, 36 - not 24. in end, 36 draw cube correctly. so, brain going nuts.

3d mesh collada indices

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