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1.140

vercel/streamdown1.140Apr 1, 2026by lukemckinstry

AI Summary

This release introduces strict WebGL 2 requirements for billboards and labels, adds experimental performance-focused vector primitive APIs, and enhances Reality Data support for GaussianSplat3DTiles.

Key Highlights

  • Billboards and labels now require device support for WebGL 2, or WebGL 1 with specific extensions.
  • Experimental, performance-focused vector primitive APIs: BufferPointCollection, BufferPolylineCollection, and BufferPolygonCollection.
  • Added support for Reality Data of type GaussianSplat3DTiles in ITwinData.
  • WebMapTileServiceImageryProvider now supports GetFeatureInfo for both KVP and RESTful WMTS services.
  • Added a new PathGraphics.relativeTo property for reference frame flexibility.

Breaking Changes

  • Billboards and labels now require device support for WebGL 2, or WebGL 1 with ANGLE_instanced_arrays and MAX_VERTEX_TEXTURE_IMAGE_UNITS > 0.

New Features

  • Experimental BufferPointCollection, BufferPolylineCollection, and BufferPolygonCollection APIs
  • GaussianSplat3DTiles support via ITwinData
  • WebMapTileServiceImageryProvider GetFeatureInfo support
  • PathGraphics.relativeTo property

Full Release Notes

1.140 - 2026-04-01

Highlights include:

 - Billboards and labels now require device support for WebGL 2, or WebGL 1 with ANGLE_instanced_arrays and MAX_VERTEX_TEXTURE_IMAGE_UNITS > 0. https://github.com/CesiumGS/cesium/issues/13053 https://github.com/CesiumGS/cesium/pull/13253
 - Added experimental, performance-focused vector primitive APIs: BufferPointCollection, BufferPolylineCollection, and BufferPolygonCollection. https://github.com/CesiumGS/cesium/pull/13212
 - Added support for Reality Data of type ITwinPlatform.RealityDataType.GaussianSplat3DTiles to ITwinData.createTilesetForRealityDataId. https://github.com/CesiumGS/cesium/pull/13208
 - Added GetFeatureInfo support to WebMapTileServiceImageryProvider, enabling WebMapTileServiceImageryProvider.pickFeatures for both KVP and RESTful WMTS services. New class parameters include enablePickFeatures, getFeatureInfoFormats, getFeatureInfoUrl, and getFeatureInfoParameters. https://github.com/CesiumGS/cesium/pull/13196
 - Added limited support (via downcasting) for double-precision metadata types in custom shaders. https://github.com/CesiumGS/cesium/pull/13323
 - Added a new experimental property PathGraphics.relativeTo which allows entity PathGraphics to be displayed in a reference frame relative to another entity, or a different reference frame than the entity's Position.ReferenceFrame. https://github.com/CesiumGS/cesium/pull/13223


See the [changelog](https://github.com/CesiumGS/cesium/blob/1.140/CHANGES.md) for the complete list of changes.