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husk renders more deep samples than sick #2260

@xsisupport

Description

@xsisupport

Set up a scene with any VDB and render deepexr..
The render with husk will have more deep samples. A sick render has the expected number of samples.

User report:
If we leave the default 0.01 tolerance values (on both alpha and depth tolerance), we get about 20-55 samples per pixel when rendering in Husk vs 10-25 samples with Sick (almost half the disk space).
The big difference happens when we get way more aggressive and crank up both tolerance values to 0.5. We get around 10-50 samples per pixel for Husk vs 2-3 samples per pixel for Sick (Husk results take 10x more disk space).

In my own test, I saw 7 to 13 deep samples with husk, and 4 with sick
(that's what I saw with the DeepSample node in Nuke.

Here's a repro Houdini scene.
deep_volume_samples.zip

In Nuke, if you look at pos 958 778:

  • the husk render has 42 deep samples
  • the sick render has 3 deep samples

Used Software Versions

  • Latest HtoA

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