sorry for my dely on the reply… Today internet was offline in the office. Thanks for your replys.
JordanWalsh
You cant generate a vel from just the fog volume, it makes no sense. You will need the original particles with a v attrib already calculated then just add the v attribute on the VDB From Particles node, or use a volume velocity node to create the vel from your points.
Ok I see! thanks
Now I have another problem, I have create vdb from particles, I add the velocity att here, then I connect a cloud noise but the velocity is lost here… I suppose this node is incompatible with this workflow right?
jsmack
One of the features announced in 16.5 is volume optical flow, which can compute a vector field from a sequence of volumes or images.
Wow! that's sound amazing. Is there a tutorial to see how to use it properly?
Thanks for the info!