UnityGLTF 2.10.0-rc

This release fixes a number of stale issues in the repository, improves performance for scenes with many nodes, and contains various correctness improvements for topology, quantization, mesh accessors, exception handling. Thanks a lot to @pfcDorn for pushing many areas forward!

Notable new features:

• Support for EXT_mesh_gpu_instancing on import – instances are turned into individual GameObjects with GPU Instancing enabled for their materials.
• There is now a blend shape frame weight import option that helps with retargeting FBX and glTF blend shape animations, for example for facial animation data.
• The remaining topology modes allowed in glTF, LineLoop, TriangleStrip and TriangleFan, are now converted to topologies supported by Unity on import. Previously these modes were not supported.

Changelog:

• fix: GLTFRecorder issue where resulting animation would have linear interpolation for cases where a jump was expected
• fix: GLTFSettings toolbar active index correctly stored in session now
• fix: don't export empty buffers with length 0
• fix: check for valid Humanoid avatar before export (#681)
• fix: work around SRP issue with invalid camera data in render passes affecting rough refractions
• fix: issue when morph targets have varying normals and tangents data (#682)
• fix: prevent exception in earlier 2022.x versions with isDataSRGB not being available
• fix: missing normalization checks for quantized accessor data (#693)
• fix: make sure topology are triangles for calculating normals/tangents (#133)
• fix: KTX2 textures were not checking for linear for "Fix All" importer button
• fix: MAOS maps (combined metallic/ambient occlusion/roughness) were not exported correctly
• fix: wrong accessor UBYTE > BYTE and BYTE > SBYTE conversion when reading data in some
• fix: restore multithreading support and improve performance
• feat: import plugin for EXT_mesh_gpu_instancing extension
• feat: added blend shape frame weight import option for easier animation retargeting
• feat: show failing filenames more clearly when exceptions occur during import
• feat: add option to hide scene obj during loading in GLTFComponent
• feat: add import support for glTF LineLoop, TriangleStrip, TriangleFan topologies
• feat: performance improvements in name resolution for importing files with many nodes
• feat: performance improvements by using NativeArray and Mathematics types