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Add support for GLTF Serializer #1448
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Currently it is not possible to use the GLTF Serializer functionality due some missing Polyfills. Calling GLTF2Export.GLBAsync directly is not possible because Native does not have a implementation for Blob. It is simple to modify GLBAsync to export an ArrayBufferView instead. However, when serializing models with textures we also need OffscreenCanvas. Since this class does not exist in Native we get an exception in the serializer level.
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bkaradzic-microsoft commentedon Oct 23, 2026
The missing pieces are now implemented: native Blob landed in BabylonJS/JsRuntimeHost#108, and native Canvas support (including canvas-to-image export and canvas drawImage paths in #1855) is initialized by the current Embedding runtime. Current implementation locations are Canvas.cpp and Runtime.cpp.
Verified with published Babylon.js 9.31.3 on native headless Metal/JavaScriptCore:
GLTF2Export.GLBAsyncexports a box with a raw RGBA texture as a nativeBlob; readingBlob.arrayBuffer()produces a valid 6,520-byte GLB with an embedded PNG (checked both GLB structure and PNG signature). The existing non-Draco serializer cases 208-230 also pass individually against unchanged visual references. No exporter changes or Blob/Canvas shims were needed for this verification.Closing this serializer-support request. Broader Blob browser parity (#1241) and compression-specific failures (#1214) are separate and are not being closed by this result.