[SOLVED]VDB From Particles Too Buggy To Use?

[Atom]

Hi All,

I have a file cache of some whitewater particles. I am trying to use VDB From Particles to create a density volume so I can render them. However, as I scrub through the converted volume I see these giant white spheres sprinkled through out my animation. When I  inspect the particles I don't see the sphere, it only occurs after the vdbfromparticles node. I have tried tweaking values on the node but those giant spheres seem to persist.

Is there some other way to create a volume out of particles that does not require vdbfromparticles?

What causes those giant spheres to appear anyway?

 

If I convert to polygons they are clearly there.

Edited February 19, 2017 by Atom

[Atom]

Well, I figured it out by inspecting the pscale attribute in the geometry spreadsheet. I sorted from highest to lowest value and sure enough there were a few large values of 0.3 at the top. All other particles have a pscale of 0.048. So my guess is that these large bubbles were the result of surfacing those larger particles. I just followed it up with a wrangle and the problem went away.

if (f@pscale > 0.1) {f@pscale = 0.048;}

 

[Guest tar]

If you find a bug please post to the SideFx bug database, not the forums.

[Skybar]

You are probably creating the vdb from both points and volumes. Volume primitives have a single point in the middle which most likely is getting included as well in your case. Get rid of the volumes before using vdb from particles.