setAmbientLight and .obj files

netkoji · Post by **netkoji** » Sun Jun 07, 2009 8:04 pm

Hello everyone,

I'm currently fighting with ISceneManager::setAmbientLight() function and for some reason it does not seem to have any effect on meshes that are stored as Maya3D obj files. I tested it with the example Sydney md2 model and it works just fine but the same code for .obj file has no effect (i.e. the mesh is completely black no matter what values I set for the ambient light).

Am I missing something here? The mtl file is in place and is read successfuly, same for the texture file. Is there no support for ambient lights on obj meshes or am I simply required to make some kind of a function call?

Thanks!

hybrid · Post by **hybrid** » Sun Jun 07, 2009 8:33 pm

There had been some normals problems with obj files some time ago. Just be sure you export the normals in your .obj file, otherwise lighting won't work.

netkoji · Post by **netkoji** » Sun Jun 07, 2009 8:50 pm

The thing is that lightning DOES work and all normals are exported. It's just the setAmbientLight function that doesn't have any effect on the mesh.

Lonesome Ducky · Post by **Lonesome Ducky** » Sun Jun 07, 2009 9:31 pm

Try creating an ILightSceneNode and setting its ambient light value.

hybrid · Post by **hybrid** » Sun Jun 07, 2009 11:25 pm

Maybe your ambient material settings are wrong. If you have an ambient material of black it won't give any result whatever ambient light you define.

netkoji · Post by **netkoji** » Mon Jun 08, 2009 9:41 pm

Ducky: This is the solution that I'm currently using but the effects are not satisfactory. Certain areas of the mesh, where the light doesn't reach, are completely black (which should not be the case given that ambient light is non zero).

hybrid: Do you mean material settings in the .mtl file or a material object in the actual code?

hybrid · Post by **hybrid** » Mon Jun 08, 2009 10:02 pm

Both, or at least the one you're using.