Add PPISP USD export, SPG controller rendering, and SH bake validation#243

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moennen wants to merge 42 commits into

nv-tlabs:mainfrom

moennen:nicolasm/ppisp-controller-usd-export

Commits on May 5, 2026

fix(transcode): import NuRec USD as LightField
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feat(export): validate written LightField USD stages
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feat(post-processing): add linear-to-sRGB module
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feat(export): add linear USD color-space toggle
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feat(export): add PPISP SPG USD export
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feat(export): add PPISP Omniverse fallback writer
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feat(export): refine PPISP fallback selection
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fix(export): compose USDZ scene data from root stage
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fix(export): make PPISP USD export usable from checkpoints
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feat(export): gate Omniverse USD authoring
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fix(export): refine PPISP Omniverse export behavior
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feat(export): bake post-processing into SH
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refactor(export): clarify post-processing native mode
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feat(export): support fixed PPISP native export
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feat(tools): add image comparison viewer
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fix(validation): avoid NaNs in linear to sRGB
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fix(tools): improve image comparison metrics
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feat(validation): add simple SH bake comparison
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feat(export): add ParticleField sorting hint option
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feat(export): PPISP controller SPG export

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feat(export): add --ignore-ppisp-controller flag

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feat(tools): add PPISP controller triage script

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fix(spg): route controller output through omni:rtx:aov RenderVar

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fix(spg): drop 'require' substring from PPISP lua sandbox messages

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fix(spg): probe slang buffer-helper API names at lua dispatch

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spg: broaden buffer-helper probe to surface metatable + all candidates

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fix(spg): rename g_Weights -> weights to match USD attribute name

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fix(spg): move weights inside ParameterBlock to silence reflection warning

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feat(bake): warm-start fitted PPISP SH bake with simple-bake init

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feat(bake): interpolated-view sampling for the SH bake fit loop

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fix(bake): match PPISP fit reference encoding (linear -> sRGB + clamp)

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fix(bake): compose Jacobian through srgb_to_linear and clip outliers

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refactor(bake): drop random-pair-slerp view sampler

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feat(tools): add ppisp_export bake-modes ablation tool

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feat(export): default to DC-only sRGB warm-start + trajectory + 13 epochs

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fix(bake): produce gamma-space SH and co-optimise density

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feat(export): expose per-param-group bake LRs; default vignetting=none

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refactor(tools): trim bake-modes benchmark for the gamma-SH pipeline

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perf(export): drop default bake epochs from 13 to 7

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feat(export): add --output-scale to scale exported SH output

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feat(ppisp-spg): add user-overridable per-camera responsivity

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chore(export): clean up PPISP PR docs
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