Problem with VRayExtraText - VRayDirt

[noemin]

Hi I'm new at this forum.

 

My problem is I’m using many tutorials to make ambient occlusion in a exterior scene with a window. The problem is, when I render, all glass material appears in color black. I don’t know if I’m putting something wrong.

 

I click affect shadows and “in all channels” into glass material options. Work with transparency in VRayDirt Parameters and exclude all glass material, all like the tutorials. I try to flip normals too but it doesn't work. I make an scene to try, box and window with chair inside.

 

I think it’s a problem of GI environment or something like that… Any idea?

 

Thank you! I’m desesperate! X_D