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Comping reflections and shadows over other shadows

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  • Comping reflections and shadows over other shadows

    Hello,
    I know that this is a recurrent topic in the forum. I did a search but couldn't find the solution.

    I’ll explain the case:
    We are rendering an interior of a shopping centre and we want to comp animated people inside the building. The plate (building) has a glass roof with ribs that project some shadows in the floor. So now, idealy, we want to render people in separate pass and get:
    -shadows from them cut by the shadows of the ribs
    -reflection in the floor
    -reflection in the windows of the shops
    -People inside shops
    -Matte for objects in the foreground

    I did before some external animation comping and I got the reflections by rendering the people in white, hidden to the camera and use the white reflection as a mask. But here, this thing about the overlapped shadow is giving me a big headache.

    I give you a link to the scene sample where I’m trying to test these things. It consists in a few simple boxes and materials but it reproduces the situation (max9-64+Vray1.5).

    http://www.laffertystudio.com/matte.max.zip


    I assume that the answer may be quite elaborate so I want to thank any help in advance.

    Cheers!
    Manuel
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