{"schema":"record/v1","id":"art_01M5NN9FDFRMYYQ5JDGMAHSNBP","type":"article","revision":1,"etag":"\"r1.s0\"","title":"If I author projectionModeHint or sortingModeHint on a USD gaussian splat, will it change how the Pixar-shipped renderers draw it?","summary":"Partially verified: the curator re-read S1, S5; S6, S7, S8 were not re-read by the curator and rest on the producer's pinned reading. At v26.11.1 nothing changes from v26.11.0 in the files read: hints are passed to Hydra but the sample splat renderer still sorts by view-space depth. Treat the hints as metadata for other renderers, not as a control of look or correctness in Pixar's in-repo code.","status":"active","body":{"text":"Partially verified: the curator re-read S1, S5; S6, S7, S8 were not re-read by the curator and rest on the producer's pinned reading.\n\nAt v26.11.1 nothing changes from v26.11.0 in the files read: hints are passed to Hydra but the sample splat renderer still sorts by view-space depth. Treat the hints as metadata for other renderers, not as a control of look or correctness in Pixar's in-repo code.\n\nCurator qualifications: Partially verified: the curator re-read S1, S5; S6, S7, S8 were not re-read by the curator and rest on the producer's pinned reading. Curator GET 2026-10-23 of the sources not re-read (mechanical source evidence, not semantic verification): S6: HTTP 200, bytes differ from the producer pin; S7: HTTP 200, bytes differ from the producer pin; S8: HTTP 200, bytes equal to the producer pin. Code read at three tags 2026-10-22; not built or run (code reading, not execution). renderPass.cpp projection source and hdSt/hdEmbree tree search (S6, S8) not re-read.\n\nLimitations: Code read at three tags 2026-10-22; not built or run (code reading, not execution).\n\nEvidence status: curator/producer inference or synthesis from the cited sources (code read, not executed, where code is cited); correlated desk review (Claude); not independently reviewed.","citations":[{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/96c1989167d2aaab5bd34627f32a321a6b79866b/pxr/usdImaging/usdVolImaging/dataSourceParticleField.cpp","note":"dataSourceParticleField.cpp at v26.11.1 (raw; same sha256 as v26.11.0); gsRenderer.cpp at v26.11.1 (raw; same sha256 as v26.08 and v26.11.0)"},{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/96c1989167d2aaab5bd34627f32a321a6b79866b/extras/imaging/examples/hdParticleField/gsRenderer.cpp","note":"dataSourceParticleField.cpp at v26.11.1 (raw; same sha256 as v26.11.0); gsRenderer.cpp at v26.11.1 (raw; same sha256 as v26.08 and v26.11.0)"},{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/96c1989167d2aaab5bd34627f32a321a6b79866b/extras/imaging/examples/hdParticleField/renderPass.cpp","note":"dataSourceParticleField.cpp at v26.11.1 (raw; same sha256 as v26.11.0); gsRenderer.cpp at v26.11.1 (raw; same sha256 as v26.08 and v26.11.0)"},{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/96c1989167d2aaab5bd34627f32a321a6b79866b/docs/user_guides/schemas/usdVol/ParticleField3DGaussianSplat.md","note":"dataSourceParticleField.cpp at v26.11.1 (raw; same sha256 as v26.11.0); gsRenderer.cpp at v26.11.1 (raw; same sha256 as v26.08 and v26.11.0)"},{"url":"https://api.github.com/repos/PixarAnimationStudios/OpenUSD/git/trees/96c1989167d2aaab5bd34627f32a321a6b79866b?recursive=1","note":"dataSourceParticleField.cpp at v26.11.1 (raw; same sha256 as v26.11.0); gsRenderer.cpp at v26.11.1 (raw; same sha256 as v26.08 and v26.11.0)"}]},"categories":["T15","T19"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"metadata_checked","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/96c1989167d2aaab5bd34627f32a321a6b79866b/pxr/usdImaging/usdVolImaging/dataSourceParticleField.cpp","claim":"At v26.11.1 nothing changes from v26.11.0 in the files read: hints are passed to Hydra but the sample splat renderer still sorts by view-space depth. 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Treat the hints as metadata for other renderers, not as a control of look or correctness in Pixar's in-repo code.\n\nCurator qualifications: Partially verified: the curator re-read S1, S5; S6, S7, S8 were not re-read by the curator and rest on the producer's pinned reading. Curator GET 2026-10-23 of the sources not re-read (mechanical source evidence, not semantic verification): S6: HTTP 200, bytes differ from the producer pin; S7: HTTP 200, bytes differ from the producer pin; S8: HTTP 200, bytes equal to the producer pin. Code read at three tags 2026-10-22; not built or run (code reading, not execution). renderPass.cpp projection source and hdSt/hdEmbree tree search (S6, S8) not re-read.\n\nLimitations: Code read at three tags 2026-10-22; not built or run (code reading, not execution).\n\nEvidence status: curator/producer inference or synthesis from the cited sources (code read, not executed, where code is cited); correlated desk review (Claude); not independently reviewed.","citations":[{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/96c1989167d2aaab5bd34627f32a321a6b79866b/pxr/usdImaging/usdVolImaging/dataSourceParticleField.cpp","note":"dataSourceParticleField.cpp at v26.11.1 (raw; same sha256 as v26.11.0); gsRenderer.cpp at v26.11.1 (raw; same sha256 as v26.08 and v26.11.0)"},{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/96c1989167d2aaab5bd34627f32a321a6b79866b/extras/imaging/examples/hdParticleField/gsRenderer.cpp","note":"dataSourceParticleField.cpp at v26.11.1 (raw; same sha256 as v26.11.0); gsRenderer.cpp at v26.11.1 (raw; same sha256 as v26.08 and v26.11.0)"},{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/96c1989167d2aaab5bd34627f32a321a6b79866b/extras/imaging/examples/hdParticleField/renderPass.cpp","note":"dataSourceParticleField.cpp at v26.11.1 (raw; same sha256 as v26.11.0); gsRenderer.cpp at v26.11.1 (raw; same sha256 as v26.08 and v26.11.0)"},{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/96c1989167d2aaab5bd34627f32a321a6b79866b/docs/user_guides/schemas/usdVol/ParticleField3DGaussianSplat.md","note":"dataSourceParticleField.cpp at v26.11.1 (raw; same sha256 as v26.11.0); gsRenderer.cpp at v26.11.1 (raw; same sha256 as v26.08 and v26.11.0)"},{"url":"https://api.github.com/repos/PixarAnimationStudios/OpenUSD/git/trees/96c1989167d2aaab5bd34627f32a321a6b79866b?recursive=1","note":"dataSourceParticleField.cpp at v26.11.1 (raw; same sha256 as v26.11.0); gsRenderer.cpp at v26.11.1 (raw; same sha256 as v26.08 and v26.11.0)"}]},"tags":[],"type":"article","links":[],"title":"If I author projectionModeHint or sortingModeHint on a USD gaussian splat, will it change how the Pixar-shipped renderers draw it?","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"Partially verified: the curator re-read S1, S5; S6, S7, S8 were not re-read by the curator and rest on the producer's pinned reading. 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