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Document SOG version 3 and blind data - #1335
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The SOG format spec now covers versions 2 and 3, both supported, with a table of the differences and the version-specific parts marked: the exponential-map orientation, squared opacity up to 1.5625, a 4th SH band, 24-bit palette labels and per-gaussian blind data. The Work Buffer Format page shows how a copy modifier reads blind fields through getBlind_<name>() and SOG_BLIND_<name>, with the Blind Data example, and Streamed SOG notes that chunks may be either version. English and Japanese.
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Documents SOG version 3 (playcanvas/engine#9873) and its blind data (playcanvas/engine#9960) for engine 2.24. Version 2 stays fully documented: both versions are supported, and the spec marks where they differ.
Changes:
quats.webp, v3 a 24-bit exponential map in the alpha channels ofmeans_l,means_uandscales(noquats.webp)sh0.a / 255, v3(sh0.a / 204)²up to 1.5625, with the optionalmeta.opacity.maxmeta.blindimages, field types (u8–u32,f16,f32,unorm8,unorm16withrange), in-order little-endian packing and a decoding samplemeta.jsonfor both versions, and versioning guidance on when to write v2getBlind_<name>(),SOG_BLIND_<name>and the name-to-identifier rule, with a GLSL / WGSL modifier and the Blind Data exampleExamples:
gaussian-splatting-fx/blind-dataThe spec documents the
meta.blindlayout the engine reads (fields in order,range). SplatTransform's v3 writer, not yet released, still writesoffsetandmin/max, and needs to move to this layout.