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Unreal Alembic import (E7) not re-read.\n\nLimitations: Zero-fetch review 2026-10-22 against held readbacks; nothing executed.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://dev.epicgames.com/documentation/en-us/unreal-engine/alembic-file-importer-in-unreal-engine","note":"OpenUSD ee47c679 usdSkel/doxygen/schemaOverview.dox L82-L134; Alembic 6f59e4d0 AbcGeom/OPolyMesh.h L72-L96; Alembic AbcCoreAbstract/TimeSampling.h L52-L56; OpenUSD ee47c679 usdAbc/alembicReader.cpp L1015-L1027, L1100-L1108"},{"url":"https://github.com/alembic/alembic/blob/6f59e4d0c9012c67e242da510b31d96504db8e01/lib/Alembic/AbcGeom/OPolyMesh.h","note":"OpenUSD ee47c679 usdSkel/doxygen/schemaOverview.dox L82-L134; Alembic 6f59e4d0 AbcGeom/OPolyMesh.h L72-L96; Alembic AbcCoreAbstract/TimeSampling.h L52-L56; OpenUSD ee47c679 usdAbc/alembicReader.cpp L1015-L1027, L1100-L1108"},{"url":"https://github.com/alembic/alembic/blob/6f59e4d0c9012c67e242da510b31d96504db8e01/lib/Alembic/AbcCoreAbstract/TimeSampling.h","note":"OpenUSD ee47c679 usdSkel/doxygen/schemaOverview.dox L82-L134; Alembic 6f59e4d0 AbcGeom/OPolyMesh.h L72-L96; Alembic AbcCoreAbstract/TimeSampling.h L52-L56; OpenUSD ee47c679 usdAbc/alembicReader.cpp L1015-L1027, L1100-L1108"},{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/ee47c679abde5b467a7b6a41f3b2285564a4222e/pxr/usd/usdSkel/doxygen/schemaOverview.dox","note":"OpenUSD ee47c679 usdSkel/doxygen/schemaOverview.dox L82-L134; Alembic 6f59e4d0 AbcGeom/OPolyMesh.h L72-L96; Alembic AbcCoreAbstract/TimeSampling.h L52-L56; OpenUSD ee47c679 usdAbc/alembicReader.cpp L1015-L1027, L1100-L1108"},{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/ee47c679abde5b467a7b6a41f3b2285564a4222e/pxr/usd/plugin/usdAbc/alembicReader.cpp","note":"OpenUSD ee47c679 usdSkel/doxygen/schemaOverview.dox L82-L134; Alembic 6f59e4d0 AbcGeom/OPolyMesh.h L72-L96; Alembic AbcCoreAbstract/TimeSampling.h L52-L56; OpenUSD ee47c679 usdAbc/alembicReader.cpp L1015-L1027, L1100-L1108"}]},"categories":["T07","T11","T15"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://dev.epicgames.com/documentation/en-us/unreal-engine/alembic-file-importer-in-unreal-engine","claim":"UsdSkel stores joints in an ordered list with world-space bind and local-space rest transforms (rest may be omitted only with a complete, non-sparse animation; animation joint order may differ from the skeleton's). 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Unreal Alembic import (E7) not re-read.\n\nLimitations: Zero-fetch review 2026-10-22 against held readbacks; nothing executed.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://dev.epicgames.com/documentation/en-us/unreal-engine/alembic-file-importer-in-unreal-engine","note":"OpenUSD ee47c679 usdSkel/doxygen/schemaOverview.dox L82-L134; Alembic 6f59e4d0 AbcGeom/OPolyMesh.h L72-L96; Alembic AbcCoreAbstract/TimeSampling.h L52-L56; OpenUSD ee47c679 usdAbc/alembicReader.cpp L1015-L1027, L1100-L1108"},{"url":"https://github.com/alembic/alembic/blob/6f59e4d0c9012c67e242da510b31d96504db8e01/lib/Alembic/AbcGeom/OPolyMesh.h","note":"OpenUSD ee47c679 usdSkel/doxygen/schemaOverview.dox L82-L134; Alembic 6f59e4d0 AbcGeom/OPolyMesh.h L72-L96; Alembic AbcCoreAbstract/TimeSampling.h L52-L56; OpenUSD ee47c679 usdAbc/alembicReader.cpp L1015-L1027, L1100-L1108"},{"url":"https://github.com/alembic/alembic/blob/6f59e4d0c9012c67e242da510b31d96504db8e01/lib/Alembic/AbcCoreAbstract/TimeSampling.h","note":"OpenUSD ee47c679 usdSkel/doxygen/schemaOverview.dox L82-L134; Alembic 6f59e4d0 AbcGeom/OPolyMesh.h L72-L96; Alembic AbcCoreAbstract/TimeSampling.h L52-L56; OpenUSD ee47c679 usdAbc/alembicReader.cpp L1015-L1027, L1100-L1108"},{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/ee47c679abde5b467a7b6a41f3b2285564a4222e/pxr/usd/usdSkel/doxygen/schemaOverview.dox","note":"OpenUSD ee47c679 usdSkel/doxygen/schemaOverview.dox L82-L134; Alembic 6f59e4d0 AbcGeom/OPolyMesh.h L72-L96; Alembic AbcCoreAbstract/TimeSampling.h L52-L56; OpenUSD ee47c679 usdAbc/alembicReader.cpp L1015-L1027, L1100-L1108"},{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/ee47c679abde5b467a7b6a41f3b2285564a4222e/pxr/usd/plugin/usdAbc/alembicReader.cpp","note":"OpenUSD ee47c679 usdSkel/doxygen/schemaOverview.dox L82-L134; Alembic 6f59e4d0 AbcGeom/OPolyMesh.h L72-L96; Alembic AbcCoreAbstract/TimeSampling.h L52-L56; OpenUSD ee47c679 usdAbc/alembicReader.cpp L1015-L1027, L1100-L1108"}]},"tags":[],"type":"article","links":[],"title":"When animation leaves the DCC as UsdSkel or an Alembic cache, which of joint order, bind/rest pose, topology, velocity, time base and units are stated by the specs and what does the Alembic-to-USD reader do with the rest?","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":"UsdSkel stores joints in an ordered list with world-space bind and local-space rest transforms (rest may be omitted only with a complete, non-sparse animation; animation joint order may differ from the skeleton's). 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