Implement support for KHR_gaussian_splatting and KHR_gaussian_splatting_compression_spz_2
#1262
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One random thing to note, might be a concern might not, the SPZ decoding rewrites the color channel to always be a float. This is because I was having some issues with handling conversions to the |
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Some things I'd like to fix with the
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| "scripts": { | ||
| "generate-3d-tiles": "node index.js --schemas https://raw.githubusercontent.com/CesiumGS/3d-tiles/cesium-native/specification/schema/tileset.schema.json https://raw.githubusercontent.com/CesiumGS/3d-tiles/cesium-native/specification/schema/common/rootProperty.schema.json https://raw.githubusercontent.com/CesiumGS/3d-tiles/cesium-native/specification/schema/PropertyTable/propertyTable.schema.json https://raw.githubusercontent.com/CesiumGS/3d-tiles/cesium-native/specification/schema/Subtree/subtree.schema.json https://raw.githubusercontent.com/CesiumGS/3d-tiles/cesium-native/specification/schema/Schema/schema.schema.json https://raw.githubusercontent.com/CesiumGS/3d-tiles/cesium-native/specification/schema/Statistics/statistics.schema.json --output ../../Cesium3DTiles --readerOutput ../../Cesium3DTilesReader --writerOutput ../../Cesium3DTilesWriter --extensions https://raw.githubusercontent.com/CesiumGS/3d-tiles/cesium-native/extensions/ --namespace Cesium3DTiles --readerNamespace Cesium3DTilesReader --writerNamespace Cesium3DTilesWriter --config 3dTiles.json", | ||
| "generate-gltf": "node index.js --schemas https://raw.githubusercontent.com/CesiumGS/glTF/cesium-native/specification/2.0/schema/glTF.schema.json --output ../../CesiumGltf --readerOutput ../../CesiumGltfReader --writerOutput ../../CesiumGltfWriter --extensions https://raw.githubusercontent.com/CesiumGS/glTF/cesium-native/extensions/2.0/ --namespace CesiumGltf --readerNamespace CesiumGltfReader --writerNamespace CesiumGltfWriter --config glTF.json", | ||
| "generate-gltf": "node index.js --schemas https://raw.githubusercontent.com/CesiumGS/glTF/cesium-native/specification/2.0/schema/glTF.schema.json --output ../../CesiumGltf --readerOutput ../../CesiumGltfReader --writerOutput ../../CesiumGltfWriter --extensions https://raw.githubusercontent.com/CesiumGS/glTF/cesium-native/extensions/2.0/ https://raw.githubusercontent.com/CesiumGS/glTF/draft-splat-spz/extensions/2.0/ --namespace CesiumGltf --readerNamespace CesiumGltfReader --writerNamespace CesiumGltfWriter --config glTF.json", |
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Please open a PR to merge the draft extension into the cesium-native branch, rather than pulling it from a separate branch. Or maybe Adam already did?
CesiumGS/glTF#88
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Looks like it needs an update, but you can open another similar PR.
It now matches the official vcpkg one as of `2025.09.17`, plus it adds the `loadSpz.patch` patch to add an overload of loadSpz taking a raw pointer.
| return unpackGaussians(loadSpzPacked(data), o); | ||
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| +GaussianCloud loadSpz(const uint8_t *data, int32_t size, const UnpackOptions &o) { |
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Let's open a PR upstream for this. It seems like a nice change that should be easy to get accepted, and then we (eventually) won't need an overlay port. spz is in vcpkg now, btw.
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PR made: nianticlabs/spz#62
2 participants
Closes #1219. This PR adds support for the new
KHR_gaussian_splattingextension and theKHR_gaussian_splatting_compression_spz_2extension. The latter is the majority of this PR - it implements SPZ decoding using the spz library, allowing glTFs with SPZ payloads to be read. It also implements backwards compatibility for theKHR_spz_gaussian_splats_compressionandKHR_gaussian_splatting_compression_spzextensions, previous iterations that have already had some tilesets created using them.