I used the same code to load the same model in the official download version 1.76 and version 1.82. Version 1.76 loads correctly. Version 1.82 has an error message:
Cannot read property ‘undefined’ of undefined
I found in ModelUtility.computeBoundingSphere the gltf.scene is undefined (in version 1.76 is commonly 0) then I saw the model param requested address is a json (should be b3dm). What is the difference between parsing 3DTiles in 1.82 and 1.76?Or what can I do to fix it?
@onsummer
That’s correct! @QianWu184 more details about 1.83 can be found here:
# Change Log
### 1.83 - 2021-07-01
##### Breaking Changes :mega:
- Dropped support for KTX1 and Crunch textures; use the [`ktx2ktx2`](https://github.com/KhronosGroup/KTX-Software) converter tool to update existing KTX1 files.
##### Additions :tada:
- Added support for KTX2 and Basis Universal compressed textures. [#9513](https://github.com/CesiumGS/cesium/issues/9513)
- Added support for glTF models with the [`KHR_texture_basisu`](https://github.com/KhronosGroup/glTF/blob/master/extensions/2.0/Khronos/KHR_texture_basisu/README.md) extension.
- Added support for 8-bit, 16-bit float, and 32-bit float KTX2 specular environment maps.
- Added support for KTX2 images in `Material`.
- Added new `PixelFormat` and `WebGLConstants` enums from WebGL extensions `WEBGL_compressed_texture_etc`, `WEBGL_compressed_texture_astc`, and `EXT_texture_compression_bptc`.
- Added dynamic terrain exaggeration with `Globe.terrainExaggeration` and `Globe.terrainExaggerationRelativeHeight`. [#9603](https://github.com/CesiumGS/cesium/pull/9603)
- Added `CustomHeightmapTerrainProvider`, a simple `TerrainProvider` that gets height values from a callback function. [#9604](https://github.com/CesiumGS/cesium/pull/9604)
- Added the ability to hide outlines on OSM Buildings and other tilesets and glTF models using the CESIUM_primitive_outline extension. [#8959](https://github.com/CesiumGS/cesium/issues/8959)
- Added checks for supported 3D Tiles extensions. [#9552](https://github.com/CesiumGS/cesium/issues/9552)
- Added option to ignore extraneous colorspace information in glTF textures and `ImageBitmap`. [#9624](https://github.com/CesiumGS/cesium/pull/9624)
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-Sam