I'd like to pickup that ink-shading topic based one the krakatoa-workflow (particles advected by fluids and rendered with volume-shader) http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=11822 As Miguel Salek stated there, not only the advecting particles but especially the custom RenderMan-shader did the diffusion-trick to get that streaklike-effect without having to render millions of particles. I'd like to know if there are maybe any similar VEX-shader