Mental ray problem with render

[blaz11]

Hello all!

I have a huge problem with mental ray. When i am in the proccess of making a scene in 3ds max with mental ray and everything is still normal (image 1), then at some pont something goes wrong, because when i want to render the image, this comes up (image 2). I do not know what is wrong, because i use Arch material shaders, the light is supported by mental ray, and i am all out of ideas, what could be wrong. The only thing i discovered is that if i turn on the material override function, in some cases the render is ok.

Thank you for your help!

1.jpg2.jpg

[Mike_Renouf]

Isn't image 2 just mentalray creating its final gather points?

[Aruz]

I'm Quite Sure the Problem is the Force 2-sided is off in Render Setup Common Tab
Capture.JPG