Polygon offset in COLLADA

Other Standards COLLADA
1

Hi,

Can somebody please explain me how to specify polygon offset in COLLADA?

I am working on some utility to convert 3D models from various formats to COLLADA and I need to solve some ‘depth-buffer collisions’.

Thanks

Tomas

2

In COLLADA, <geometry> is agnostic to rendering. All the information about rendering and appearance is symbolically bound to the primitives material attribute. E.g:


<geometry>
 <mesh>
 ...
  <triangles material="my_appearance" />
 ...
 </mesh>
</geometry>

Since polygon offset is a rendering trick, my first approach would be to add the information into the material/effect.

It’s also possible to add the offset values as another <source> and <input> stream and assemble them as more per-vertex meta data. The material will still have to know what to do with the information.

Regards,
Marcus