1.143

CesiumGS/cesium1.143Jul 1, 2026by ggetz

AI Summary

This release adds support for glTF meshopt compression and introduces a new material mode for PathGraphics to visualize path segments with different materials.

Key Highlights

Added support for KHR_meshopt_compression glTF extension
Added PathGraphics.materialMode with 'PORTIONS' option
Fixed crashes when using billboards with custom promise implementations

New Features

glTF meshopt compression support
PathGraphics segment visualization with different materials

Full Release Notes

1.143 - 2026-07-01

Highlights include:

- Added support for the [`KHR_meshopt_compression`](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_meshopt_compression) glTF extension, including the v1 attribute codec and the `COLOR` filter. [#13553](https://github.com/CesiumGS/cesium/pull/13553)
- Added `PathGraphics.materialMode`. A value of `"PORTIONS"` allows visualizing the path in segments with different materials specified by intervals or sampling. Each segment material is determined by the `material` property value at the corresponding simulation time. The default value of `"WHOLE"` preserves existing material behavior. [#13530](https://github.com/CesiumGS/cesium/pull/13530)
- Fixed a bug that caused crashes when using billboards in environments that replace `Promise` with custom promise implementations. [#13475](https://github.com/CesiumGS/cesium/pull/13475)

See the [changelog](https://github.com/CesiumGS/cesium/blob/1.143/CHANGES.md) for the complete list of changes.