jim chang

Hi everyone,

I'm encountering an issue with whitewater rendering in Karma XPU and would appreciate your expertise.

Scenario:

Simulated ocean waves with Karma XPU

Dynamic whitewater: Volume-rendered

Stationary/splash whitewater: Uniform-rendered particles

Problem:
The dynamic whitewater appears unnaturally fog-like instead of having distinct foam shapes, even though stationary/splash particles render correctly with uniform mode.

Current Setup:

Dynamic whitewater: Volume rendering with @pscale attribute

Stationary/splash: Point cloud + Karma particle uniform rendering


Side-by-side comparison video (simulation vs render)
Attached:



Key Questions:

Is this caused by insufficient particle count for volume rendering?

Could there be hidden parameter conflicts between volume/particle renders?

Any recommended Karma XPU-specific optimizations for hybrid rendering setups?

Thank you in advance for any insights!

Hi everyone,

I'm working on a FLIP fluid simulation in Houdini, and I've noticed that the surface field generated by the FLIP Solver is significantly larger compared to the one created using the VDB from Particles node with the same particles.

Here are the key details of my setup:

The Particle Radius Scale in the FLIP Solver is set to 1.2 (same as in the VDB from Particles node).
Surface Tension is turned off.
Reseeding is disabled.
The VDB from Particles node is using its default settings.
The particle radii match between both methods.
Despite these matching parameters, the FLIP surface appears to be much larger and more inflated. I suspect it could be related to parameters like Smoothing Bandwidth, Surface Extrapolation, or Threshold, but I’m not entirely sure where the issue lies.

Could anyone provide insights or suggestions on what might be causing this discrepancy and how I can adjust the FLIP Solver to produce a surface field that more closely matches the VDB from Particles result?

Thank you in advance for your help!

Best regards,
jim