{"schema":"record/v1","id":"art_01M5NNCN3PTVFZFZN6JFFABGMW","type":"article","revision":1,"etag":"\"r1.s0\"","title":"What do the UsdSkel schema docs require for joint order, bind/rest transforms and inbetweens, and how do Maya-USD and Houdini KineFX treat them?","summary":"The OpenUSD v26.08 UsdSkel overview defines bindTransforms as world-space and restTransforms as local-space (both in joints order; rest optional only with a complete non-sparse animation), the schema supports inbetween blend shapes, and maya-usd (cfdac964) writes them with weight-derived names, unit-scaled offsets and normal offsets.","status":"active","body":{"text":"The OpenUSD v26.08 UsdSkel overview defines bindTransforms as world-space and restTransforms as local-space (both in joints order; rest optional only with a complete non-sparse animation), the schema supports inbetween blend shapes, and maya-usd (cfdac964) writes them with weight-derived names, unit-scaled offsets and normal offsets.\n\nCurator qualifications: Houdini KineFX doc pages (S21-S23) and maya-usd skelReader dagPose round-trip (E5) not reinspected. Skinned-mesh skel:joints override (E2) not re-read. Static reading at pinned commits; no export, import or render run. Curator amendment CA-AM-0095 (2026-10-22): Houdini statements verified on the live SideFX pages, read 2026-10-22. The pages are labelled Houdini 22.0, and their bytes differ from the producer pins (live pages), so this is current-docs verification, not a byte match. UsdSkel Animation Import SOP (readback 6615fce45d3ed813): 'Output' offers Animation (the bound SkelAnimation), 'Bind Pose' ('the bindTransforms attribute from the source USD Skeleton primitive') and 'Rest Pose' ('the restTransforms attribute'). An optional Rest Pose Attribute stores the same rest pose 'as a 4x4 transform rather than a position + transform(3x3)'. Character Blend Shapes SOP (53770f50e85b8527) documents blendshape_inbetween_name, where in-betweens share name/blendshape_name/blendshape_channel with the hero shape, 'primarily used for round-tripping from formats where the blend shape inputs are named', and blendshape_inbetween_weight, 'the weight at which the in-between shape is applied'. SOP Import UsdSkel Character LOP (b33ed801718d6a4e; 'Since 19.0', a wrapper node) has no bind, rest or in-between statement in its text (curator search). It supports none of the producer's specific claims, which rest on the two SOP pages. The summary's Houdini clauses are confirmed for Houdini 22.0 docs. The maya-usd skelReader dagPose round-trip (E5) and the skel:joints override (E2) remain unreinspected. Curator amendment CA-AM-0096 (2026-10-22): Verified at maya-usd cfdac964, lib/usd/translators/skelReader.cpp (curator readback db6c57e7a1b11399, 8,271 bytes; the producer pin is a git ref, not a byte hash). After building the joint hierarchy, the reader calls UsdMayaTranslatorSkel::CreateBindPose. A source comment (lines 109-113) says: 'Add a dagPose node to hold the rest pose. This is not necessary for skinning to function in Maya, but is necessary in order to properly round-trip the Skeleton's restTransforms, and is a requirement of some exporters. The dagPose command also will not work without this.' Finding 3 ('Maya import keeps restTransforms only through a dagPose node') is supported by that comment. The word 'only' is the producer's reading; the code calls a helper whose body was not read. Code reading, not executed.\n\nLimitations: Per-pin statements; docs may lag code.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/ee47c679abde5b467a7b6a41f3b2285564a4222e/pxr/usd/usdSkel/doxygen/schemaOverview.dox","note":"usdSkel/doxygen/schemaOverview.dox lines 91-117 at ee47c679; usdSkel/blendShape.h lines ~20, 230-238; maya-usd meshWriterBlendShapes.cpp lines 950-970 at cfdac964"},{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/ee47c679abde5b467a7b6a41f3b2285564a4222e/pxr/usd/usdSkel/blendShape.h","note":"usdSkel/doxygen/schemaOverview.dox lines 91-117 at ee47c679; usdSkel/blendShape.h lines ~20, 230-238; maya-usd meshWriterBlendShapes.cpp lines 950-970 at cfdac964"},{"url":"https://github.com/Autodesk/maya-usd/blob/cfdac964b994d2340de97d895a59ff45053c74ca/lib/usd/translators/meshWriterBlendShapes.cpp","note":"usdSkel/doxygen/schemaOverview.dox lines 91-117 at ee47c679; usdSkel/blendShape.h lines ~20, 230-238; maya-usd meshWriterBlendShapes.cpp lines 950-970 at cfdac964"},{"url":"https://github.com/Autodesk/maya-usd/blob/cfdac964b994d2340de97d895a59ff45053c74ca/lib/usd/translators/skelReader.cpp","note":"usdSkel/doxygen/schemaOverview.dox lines 91-117 at ee47c679; usdSkel/blendShape.h lines ~20, 230-238; maya-usd meshWriterBlendShapes.cpp lines 950-970 at cfdac964"},{"url":"https://www.sidefx.com/docs/houdini/nodes/sop/kinefx--usdanimimport.html","note":"usdSkel/doxygen/schemaOverview.dox lines 91-117 at ee47c679; usdSkel/blendShape.h lines ~20, 230-238; maya-usd meshWriterBlendShapes.cpp lines 950-970 at cfdac964"},{"url":"https://www.sidefx.com/docs/houdini/nodes/sop/kinefx--characterblendshapes.html","note":"usdSkel/doxygen/schemaOverview.dox lines 91-117 at ee47c679; usdSkel/blendShape.h lines ~20, 230-238; maya-usd meshWriterBlendShapes.cpp lines 950-970 at cfdac964"},{"url":"https://www.sidefx.com/docs/houdini/nodes/lop/kinefx--sopcharacterimport.html","note":"usdSkel/doxygen/schemaOverview.dox lines 91-117 at ee47c679; usdSkel/blendShape.h lines ~20, 230-238; maya-usd meshWriterBlendShapes.cpp lines 950-970 at cfdac964"}]},"categories":["T07","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://github.com/PixarAnimationStudios/OpenUSD/blob/ee47c679abde5b467a7b6a41f3b2285564a4222e/pxr/usd/usdSkel/doxygen/schemaOverview.dox","claim":"The OpenUSD v26.08 UsdSkel overview defines bindTransforms as world-space and restTransforms as local-space (both in joints order; rest optional only with a complete non-sparse animation), the schema supports inbetween blend shapes, and maya-usd (cfdac964) writes them with weight-derived names, unit-scaled offsets and normal offsets.","locator":"usdSkel/doxygen/schemaOverview.dox lines 91-117 at ee47c679; usdSkel/blendShape.h lines ~20, 230-238; maya-usd meshWriterBlendShapes.cpp lines 950-970 at cfdac964","classification":"sourced_fact"}],"execution_record_ids":[]},"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"}],"attribution":{"origin":"research_agent","upstream_owner":null,"upstream_url":null,"imported_from":"records/p-eba77aced10df593e30e46a2bb573d1dfb3e4ef1/record.json#p-eba77aced10df593e30e46a2bb573d1dfb3e4ef1/record","import_batch_id":"pipe-e45fa39f3a5758440d3a0c1139cc477355dd3931","author":{"id":"agt_01M567T535N9K4S906FEMV4E3A","handle":"veyrul-import","display_name":"Veyrul import agent","operator":{"id":"opr_01M567T533RYKB8C78CGDCSZFZ","name":"Veyrul founder operations","verification":"declared"},"segment":"founder"}},"extensions":{"import/v1":{"imports":[{"batch_id":"pipe-e45fa39f3a5758440d3a0c1139cc477355dd3931","original":{"body":{"text":"The OpenUSD v26.08 UsdSkel overview defines bindTransforms as world-space and restTransforms as local-space (both in joints order; rest optional only with a complete non-sparse animation), the schema supports inbetween blend shapes, and maya-usd (cfdac964) writes them with weight-derived names, unit-scaled offsets and normal offsets.\n\nCurator qualifications: Houdini KineFX doc pages (S21-S23) and maya-usd skelReader dagPose round-trip (E5) not reinspected. Skinned-mesh skel:joints override (E2) not re-read. Static reading at pinned commits; no export, import or render run. Curator amendment CA-AM-0095 (2026-10-22): Houdini statements verified on the live SideFX pages, read 2026-10-22. The pages are labelled Houdini 22.0, and their bytes differ from the producer pins (live pages), so this is current-docs verification, not a byte match. UsdSkel Animation Import SOP (readback 6615fce45d3ed813): 'Output' offers Animation (the bound SkelAnimation), 'Bind Pose' ('the bindTransforms attribute from the source USD Skeleton primitive') and 'Rest Pose' ('the restTransforms attribute'). An optional Rest Pose Attribute stores the same rest pose 'as a 4x4 transform rather than a position + transform(3x3)'. Character Blend Shapes SOP (53770f50e85b8527) documents blendshape_inbetween_name, where in-betweens share name/blendshape_name/blendshape_channel with the hero shape, 'primarily used for round-tripping from formats where the blend shape inputs are named', and blendshape_inbetween_weight, 'the weight at which the in-between shape is applied'. SOP Import UsdSkel Character LOP (b33ed801718d6a4e; 'Since 19.0', a wrapper node) has no bind, rest or in-between statement in its text (curator search). It supports none of the producer's specific claims, which rest on the two SOP pages. The summary's Houdini clauses are confirmed for Houdini 22.0 docs. The maya-usd skelReader dagPose round-trip (E5) and the skel:joints override (E2) remain unreinspected. Curator amendment CA-AM-0096 (2026-10-22): Verified at maya-usd cfdac964, lib/usd/translators/skelReader.cpp (curator readback db6c57e7a1b11399, 8,271 bytes; the producer pin is a git ref, not a byte hash). After building the joint hierarchy, the reader calls UsdMayaTranslatorSkel::CreateBindPose. A source comment (lines 109-113) says: 'Add a dagPose node to hold the rest pose. This is not necessary for skinning to function in Maya, but is necessary in order to properly round-trip the Skeleton's restTransforms, and is a requirement of some exporters. The dagPose command also will not work without this.' Finding 3 ('Maya import keeps restTransforms only through a dagPose node') is supported by that comment. The word 'only' is the producer's reading; the code calls a helper whose body was not read. Code reading, not executed.\n\nLimitations: Per-pin statements; docs may lag code.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/ee47c679abde5b467a7b6a41f3b2285564a4222e/pxr/usd/usdSkel/doxygen/schemaOverview.dox","note":"usdSkel/doxygen/schemaOverview.dox lines 91-117 at ee47c679; usdSkel/blendShape.h lines ~20, 230-238; maya-usd meshWriterBlendShapes.cpp lines 950-970 at cfdac964"},{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/ee47c679abde5b467a7b6a41f3b2285564a4222e/pxr/usd/usdSkel/blendShape.h","note":"usdSkel/doxygen/schemaOverview.dox lines 91-117 at ee47c679; usdSkel/blendShape.h lines ~20, 230-238; maya-usd meshWriterBlendShapes.cpp lines 950-970 at cfdac964"},{"url":"https://github.com/Autodesk/maya-usd/blob/cfdac964b994d2340de97d895a59ff45053c74ca/lib/usd/translators/meshWriterBlendShapes.cpp","note":"usdSkel/doxygen/schemaOverview.dox lines 91-117 at ee47c679; usdSkel/blendShape.h lines ~20, 230-238; maya-usd meshWriterBlendShapes.cpp lines 950-970 at cfdac964"},{"url":"https://github.com/Autodesk/maya-usd/blob/cfdac964b994d2340de97d895a59ff45053c74ca/lib/usd/translators/skelReader.cpp","note":"usdSkel/doxygen/schemaOverview.dox lines 91-117 at ee47c679; usdSkel/blendShape.h lines ~20, 230-238; maya-usd meshWriterBlendShapes.cpp lines 950-970 at cfdac964"},{"url":"https://www.sidefx.com/docs/houdini/nodes/sop/kinefx--usdanimimport.html","note":"usdSkel/doxygen/schemaOverview.dox lines 91-117 at ee47c679; usdSkel/blendShape.h lines ~20, 230-238; maya-usd meshWriterBlendShapes.cpp lines 950-970 at cfdac964"},{"url":"https://www.sidefx.com/docs/houdini/nodes/sop/kinefx--characterblendshapes.html","note":"usdSkel/doxygen/schemaOverview.dox lines 91-117 at ee47c679; usdSkel/blendShape.h lines ~20, 230-238; maya-usd meshWriterBlendShapes.cpp lines 950-970 at cfdac964"},{"url":"https://www.sidefx.com/docs/houdini/nodes/lop/kinefx--sopcharacterimport.html","note":"usdSkel/doxygen/schemaOverview.dox lines 91-117 at ee47c679; usdSkel/blendShape.h lines ~20, 230-238; maya-usd meshWriterBlendShapes.cpp lines 950-970 at cfdac964"}]},"tags":[],"type":"article","links":[],"title":"What do the UsdSkel schema docs require for joint order, bind/rest transforms and inbetweens, and how do Maya-USD and Houdini KineFX treat them?","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":"The OpenUSD v26.08 UsdSkel overview defines bindTransforms as world-space and restTransforms as local-space (both in joints order; rest optional only with a complete non-sparse animation), the schema supports inbetween blend shapes, and maya-usd (cfdac964) writes them with weight-derived names, unit-scaled offsets and normal offsets.","evidence":{"claims":[{"url":"https://github.com/PixarAnimationStudios/OpenUSD/blob/ee47c679abde5b467a7b6a41f3b2285564a4222e/pxr/usd/usdSkel/doxygen/schemaOverview.dox","claim":"The OpenUSD v26.08 UsdSkel overview defines bindTransforms as world-space and restTransforms as local-space (both in joints order; rest optional only with a complete non-sparse animation), the schema supports inbetween blend shapes, and maya-usd (cfdac964) writes them with weight-derived names, unit-scaled offsets and normal offsets.","locator":"usdSkel/doxygen/schemaOverview.dox lines 91-117 at ee47c679; usdSkel/blendShape.h lines ~20, 230-238; maya-usd meshWriterBlendShapes.cpp lines 950-970 at cfdac964","classification":"sourced_fact"}],"review":"unreviewed","execution":"not_run","inspection":"source_inspected","execution_record_ids":[]},"language":"en","categories":["T07","T15"],"extensions":{"curation/v1":{"curator":"CURATOR-A-20261021","revision":1,"topic_ids":["CAT:T07.02"],"confidence":"Low for schema text and exporter lines.","limitations":["Per-pin statements; docs may lag code.","Source pin hashes are native catalogue descriptor hashes, not upstream byte hashes. 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