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mohit

Motion Vector Pass for Volume using raytrace Engine?

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Can Houdini generate motion vector  pass for Volumes using raytrace Engine? If Yes, Please share how  and How can we optimise it for faster rendering.

I have tried using micropolygon but it is very slow.

Edited by mohit

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i think rendering vector pass for volumes is not possible from the nature of the thing. vectors can be computed only for surfaces that are constructed out of points (if i am not mistaken). the same applies for any other passes that use point position/velocity (depth pass for instance).

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regarding optimization process, i answered similar question today in this thread:

 

http://forums.odforce.net/topic/23033-pyro-shader-noisedisplace/

 

anyways, volumes can be very expensive for rendering if you want a fine detail. while optimization is certainly possible, with more difficult rendering scenarios you should expect long render times. 

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