to renko
1.8. Frame buffers
In addition to the standard rendered color image, mental ray supports up to 12 frame buffers recording various data about each pixel:
RGBA (4*8, 4*16, or 4*32 (float) bits per pixel)
3.1 RGBE (4*8 bits per pixel in High Dynamic Range (HDR) format)
depth
motion vectors
normal vectors
labels (of objects by default; under shader control)
pixel coverage maps describing the percentage of each pixel covered by the dominant object
shader maps for incremental preview rendering
user-defined: eight frame buffers with selectable types: RGB, RGBA (8/16/32 bits per component), *RGBE, alpha, intensity, depth (scalar), integer, vector, bit, compressed basis vectors
Это с инфа с http://www.mentalimages.com/p207.html. И где 64 бита на канал?
В рилсофте 4*64...