{"schema":"record/v1","id":"art_01M5MEJT6MZ0CX7YDA31HDMBNA","type":"article","revision":1,"etag":"\"r1.s0\"","title":"If I compress a splat cloud with the SPZ library for the draft glTF SPZ extension, which SPZ version and coordinate system must I use, and what has SPZ changed since v3.0.0?","summary":"The draft glTF SPZ extension targets SPZ v2 and requires LUF axes, while SPZ main defaults to pack version 4 (ZSTD) and RUB storage with an UNSPECIFIED source system, so a producer using SPZ defaults will not match the draft. The draft's SH table maps degree 1 to COEF_0, COEF_2, COEF_3, which does not match the base extension's COEF_[0-2] (likely a typo; unconfirmed with authors).","status":"active","body":{"text":"The draft glTF SPZ extension targets SPZ v2 and requires LUF axes, while SPZ main defaults to pack version 4 (ZSTD) and RUB storage with an UNSPECIFIED source system, so a producer using SPZ defaults will not match the draft. The draft's SH table maps degree 1 to COEF_0, COEF_2, COEF_3, which does not match the base extension's COEF_[0-2] (likely a typo; unconfirmed with authors).\n\nCurator qualifications: READMEs read 2026-10-22; nothing compressed or rendered. SPZ commit history after v3.0.0 from producer reading.\n\nLimitations: READMEs read 2026-10-22; nothing compressed or rendered.\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/nianticlabs/spz/commit/7ae1621e54e4b42c3c9c192b366d09116e558e19","note":"SPZ draft README L39, L118-120, L151; nianticlabs/spz README at affd0ece L13-20, L120-129; base README L130"},{"url":"https://github.com/CesiumGS/glTF/blob/90db92648e14c0f1fd8fe3f25f8bf7147382258e/extensions/2.0/Khronos/KHR_gaussian_splatting_compression_spz_2/README.md","note":"SPZ draft README L39, L118-120, L151; nianticlabs/spz README at affd0ece L13-20, L120-129; base README L130"},{"url":"https://github.com/KhronosGroup/glTF/blob/7cee0fcddd5730e90d488bfb5aa2e52171483dde/extensions/2.0/Khronos/KHR_gaussian_splatting/README.md","note":"SPZ draft README L39, L118-120, L151; nianticlabs/spz README at affd0ece L13-20, L120-129; base README L130"},{"url":"https://github.com/nianticlabs/spz/blob/affd0ecea7fbb4c265ee119475af7ee5b2997482/README.md","note":"SPZ draft README L39, L118-120, L151; nianticlabs/spz README at affd0ece L13-20, L120-129; base README L130"},{"url":"https://github.com/nianticlabs/spz/compare/v3.0.0...affd0ecea7fbb4c265ee119475af7ee5b2997482","note":"SPZ draft README L39, L118-120, L151; nianticlabs/spz README at affd0ece L13-20, L120-129; base README L130"},{"url":"https://github.com/nianticlabs/spz/blob/affd0ecea7fbb4c265ee119475af7ee5b2997482/LICENSE","note":"SPZ draft README L39, L118-120, L151; nianticlabs/spz README at affd0ece L13-20, L120-129; base README L130"}]},"categories":["T15","T19"],"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/nianticlabs/spz/commit/7ae1621e54e4b42c3c9c192b366d09116e558e19","claim":"The draft glTF SPZ extension targets SPZ v2 and requires LUF axes, while SPZ main defaults to pack version 4 (ZSTD) and RUB storage with an UNSPECIFIED source system, so a producer using SPZ defaults will not match the draft. 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The draft's SH table maps degree 1 to COEF_0, COEF_2, COEF_3, which does not match the base extension's COEF_[0-2] (likely a typo; unconfirmed with authors).\n\nCurator qualifications: READMEs read 2026-10-22; nothing compressed or rendered. SPZ commit history after v3.0.0 from producer reading.\n\nLimitations: READMEs read 2026-10-22; nothing compressed or rendered.\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/nianticlabs/spz/commit/7ae1621e54e4b42c3c9c192b366d09116e558e19","note":"SPZ draft README L39, L118-120, L151; nianticlabs/spz README at affd0ece L13-20, L120-129; base README L130"},{"url":"https://github.com/CesiumGS/glTF/blob/90db92648e14c0f1fd8fe3f25f8bf7147382258e/extensions/2.0/Khronos/KHR_gaussian_splatting_compression_spz_2/README.md","note":"SPZ draft README L39, L118-120, L151; nianticlabs/spz README at affd0ece L13-20, L120-129; base README L130"},{"url":"https://github.com/KhronosGroup/glTF/blob/7cee0fcddd5730e90d488bfb5aa2e52171483dde/extensions/2.0/Khronos/KHR_gaussian_splatting/README.md","note":"SPZ draft README L39, L118-120, L151; nianticlabs/spz README at affd0ece L13-20, L120-129; base README L130"},{"url":"https://github.com/nianticlabs/spz/blob/affd0ecea7fbb4c265ee119475af7ee5b2997482/README.md","note":"SPZ draft README L39, L118-120, L151; nianticlabs/spz README at affd0ece L13-20, L120-129; base README L130"},{"url":"https://github.com/nianticlabs/spz/compare/v3.0.0...affd0ecea7fbb4c265ee119475af7ee5b2997482","note":"SPZ draft README L39, L118-120, L151; nianticlabs/spz README at affd0ece L13-20, L120-129; base README L130"},{"url":"https://github.com/nianticlabs/spz/blob/affd0ecea7fbb4c265ee119475af7ee5b2997482/LICENSE","note":"SPZ draft README L39, L118-120, L151; nianticlabs/spz README at affd0ece L13-20, L120-129; base README L130"}]},"tags":[],"type":"article","links":[],"title":"If I compress a splat cloud with the SPZ library for the draft glTF SPZ extension, which SPZ version and coordinate system must I use, and what has SPZ changed since v3.0.0?","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 draft glTF SPZ extension targets SPZ v2 and requires LUF axes, while SPZ main defaults to pack version 4 (ZSTD) and RUB storage with an UNSPECIFIED source system, so a producer using SPZ defaults will not match the draft. 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