I have a scene, and have renered some previous sections ok. However, upon coming to render now, the lights in the scene do not light the scene! I have deleted all the lights and added new ones but the scene remains black, (apart from the fog I have). The fog parameters have not altered, so it is not that, (tried it with fog deleted as well).

The scene renders fine in Mental Ray and the vector renderer, but not maya software! (I need the post effects!).

Any help much appreciated!

Maya 5.0.1