yjcnbnbnb200 0 Posted February 14, 2014 I want to render 2D motion vector pass for my pyro volume based on its billowy smoke material, how to achieve that? And do I need to turn something on in mantra or just modify material node? Share this post Link to post Share on other sites
schwungsau 281 Posted February 14, 2014 you have feed the velocity into matrix, get inverted camera matrix and multiply it with the velocity. the write the result into color and render it. Share this post Link to post Share on other sites
yjcnbnbnb200 0 Posted February 15, 2014 Would you please show me how to get invert camera matrix? Share this post Link to post Share on other sites
yjcnbnbnb200 0 Posted February 15, 2014 And as far as I know, the vel of volume is a primitive attribute not on point level? Share this post Link to post Share on other sites
