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Hi. I need to determine which objects are actually visible from the camera(objects inside of camera frustrum and not obscured by other objects) Maybe there is some simple way to get that. But i decided to assign different colors to the objects, to render/screenshot from the camera and compare which colors were in frame and which not. I was able to turn off AA in Mantra and to output diffuse image plane with solid colors and it does everything for me. But this way is very slow. around 15sec for 1 render of 250 spheres. I tried to grab screenshot with viewwrite -q 0. But it has some AA which is mixing my colors. I'm also trying to use OpenGL Rop but i have problems also. On top picture i have nice flat colors(with High Quality Lighting off) but also AA On bottom picture i have no AA but have shading from High Quality Ligjting. Is there any way to solve this?