I'm trying to render a scene which came originally from the Blender Cloud. See previous blog post [www.janwalter.org] about it. I just bring in the geometry as .objfiles and it looks like something goes wrong when the scene gets translated to a renderer (e.g. Mantra or Arnold):
Above the spheres are less visible because of the lighting, but with Arnold's ndoteyeshader the same problem arises:
Any ideas where those spheres come from and how to fix it? I assume something is wrong with the geometry, maybe a closed volume is assumed or something?