I have a smoke sim that emits from a characters upper body and flows outward and along the surface of the character, but I'm getting really gnarly collision banding. You can really see it in the alpha of the smoke render. I have been unable to clean up the banding artifacts in the sim, and I'm currently resorting to a post process.
The colliders are airtight polys with a collision sdf. The collision voxel size matches the size of the pyro sim.
The source is points that are peaked outward from the collision surface so they don't sit directly on the character surface.
Things I have tried to fix the artifcats.
Tried both static object collider (with deforming on) and volume source to source the collsion field and collsion velocity.
Tested increased max substeps between 1-3.
Increased collision field resolution and subdivided the collsion poly surface.
Tested with "fill object" on the collsion field and/or increased bandwidth.
Applied vdb_smooth_sdf to the collsion field.
I'm out of ideas at the moment. Willing to try anything.
lewis_T Put down a VDB smooth SDF, this will smooth it out.
I already tested with a vdb_smooth_sdf node as well as subdividing my geo prior to the collision_source_sop as noted above. But just to be doubley sure, I tried again and I'm getting the same results. I've included screenshots of my smooth sdf and the resulting smoke sim.
sepu check the collision when is solving you might have a pretty low res sdf in there. How are you feeding this into the solver? Can you post the .hip
I'll see about sanitizing the hip to post, but that'll be a bit of time. I have checked the collision field in the solver by turning on the visualizer for the pyro sparse object and it looks as expected, which is to say it looks like my collision sdf field at the sop leve.
I've tried sourcing the collider both with a static object and with a volume source dop (using collision and collisionvel fields).
I'll work on posting something maybe tomorrow-ish.
That looks correct - still tough to say without looking at your .hip You might want to look at this (https://www.sidefx.com/forum/topic/103550/); you might be running into a similar situation. I don't need the whole character, just where you are having issues or some repro.
sepu That looks correct - still tough to say without looking at your .hip You might want to look at this (https://www.sidefx.com/forum/topic/103550/); you might be running into a similar situation. I don't need the whole character, just where you are having issues or some repro.
Thanks for taking a look. Here's a sanitized hip. I have freeze-framed and stashed the geo.
