hello, just learning about writing shaders in mental ray. i'm trying to write a texture shader that returns a shade of gray based on distance from a convex or concave adjacent face angle. I think I really only need the normal of the adjacent faces from the triangle that the point is being calculated on. I have all the points from the face using the mi_query function, but I can't for the life of me find anything that would tell me any information on connected adjacent faces. any help would be greatly appreciated! thanks!