32bit turns out 8bit on depth pass not other passes?

I am using mental ray in Maya 2009, I am using render layers, with associate passes, and using various render passes, such as diffuse, depth, specular, shadow, etc. I have them all set to 32 bit float, and on the render settings quality tab under framebuffer I have it set to RGBA 32 bit float. My masterbeuty comes out in 32bit, and so does for example diffuse too, but the depth pass comes out only 8 bit, even though it is locked at 32 bit (which cannot be changed).

Also, I wonder if someone might tell me what the "buffer minimum/maximum" on depth remapped really do. I use 200 on max and 0 on min which gives me an OK result I guess, but I just would like to know what they do/mean.

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