Read the complete experiment, code and evidence on Digital Garden. This is a short companion note; the original article contains the full method and measurements.
A bubble-shaped particle selection seemed like a manageable exercise after studying Entagma's viscous-fluid tutorial. I built a separate 48-frame pour in Houdini 22.0.429 and compared five ways to carry its distance attribute through the cache.
Three checks changed the implementation:
- On frames with no new centers, my distance-node configuration returned -1. Without a guard, the next threshold test selected the whole fluid.
- Stable IDs preserved identity when point order changed. Neighbor repair needed its own second Wrangle to read the completed inheritance result.
- Surfaced cavity shapes needed clipping against an inset liquid SDF. The containment checks covered 53 frame/radius outputs.
The limits are useful too. This is cached-material post-processing, not a second air-phase simulation. The larger-radius final mesh retained two local face-direction exceptions; the tests do not establish production-ready glass rendering or continuous collision freedom. The explicit CUDA probe fell back to CPU, so formal neural surfacing used DirectML.
The original write-up includes all five comparisons, the two-pass VEX, discrete mesh checks, an actual Solver SOP comparison, figures, CSV and a small source package. Codex executed the Houdini tests and assisted with numerical checks and writing.
Continue with the full Houdini FLIP bubble study on the original website.
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