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Cesium Releases in July 2025

Josh Rouzer

In June, we announced a geospatially accurate 3D Globe in QGIS supported by a Cesium Ecosystem Grant, shared our roadmap to seek your guidance as we bring iTwin digital twin capabilities to Cesium, enabled draping imagery layers on 3D Tiles in CesiumJS, and welcomed the community to Philadelphia for the first Cesium Developer Conference. 

Blue PSFS letters on top of the Loews Philadelphia Hotel in June 2025.

The iconic red PSFS letters on top of the Loews Philadelphia Hotel went blue one night and green the next during the 2025 Cesium Developer Conference.

We made improvements across Cesium this month. To get notifications about our monthly releases, you can subscribe to the Cesium release roundup thread on our community forum.

CesiumJS 1.131 release

CesiumJS 1.131 is now available. Highlights of the release include:

  • Added experimental support for loading 3D Tiles with Gaussian splats encoded with SPZ compression using the draft glTF extension. KHR_spz_gaussian_splats_compression in CesiumJS 1.130.1 #12582 
  • Added HeightReference to Cesium3DTileset.ConstructorOptions to allow clamping point features in 3D Tile vector data to terrain or 3D Tiles. #11710 
  • Added the ability to pass OffscreenCanvas & ImageBitmap directly to Material uniforms. #12558 
  • Fixed raymarching step size for cylindrical voxels. #12681 
  • Fixes handling of tileset modelMatrix changes for translations and rotations in GaussianSplatPrimitive. #12706 

For more details, see the changelog.

Download CesiumJS 1.131
Gaussian splats (left) compared to 3D Tiles Mesh (right) in CesiumJS.

Gaussian splats (left) compared to 3D Tiles Mesh (right) in CesiumJS. Try the Sandcastle.

Cesium for Unreal 2.17.0 release

Cesium for Unreal v2.17.0 is now available. This is the last release of Cesium for Unreal that will support Unreal Engine v5.3. Future versions will require Unreal Engine v5.4+.

Highlights of this release include:

  • Added support for Unreal Engine 5.6. 
  • Added a C++ and Blueprint API for loading and accessing GeoJSON data. 
  • Feature IDs that are encoded by UCesiumFeaturesMetadataComponent will now use a default null feature ID of -1 instead of 0. 
  • Materials generated by UCesiumFeaturesMetadataComponent now always check for null feature IDs, assuming a default value of –1. 

Check the Cesium for Unreal release and the Cesium for Unreal Samples release for the full list of updates.

Download the Cesium for Unreal plugin from Epic MarketplaceDownload the Cesium for Unreal Samples
Landmarks in an area in Singapore, parsed from GeoJSON and visualized in Cesium for Unreal. Sourced from iTwin Reality Feature Service (support in progress).

Landmarks in an area in Singapore, parsed from GeoJSON and visualized in Cesium for Unreal. Sourced from iTwin Reality Feature Service (support in progress).

Cesium for Unity 1.16.2 release

Cesium for Unity v1.16.2 is now available. Highlights of this release include:

  • Fixed broken support for TRIANGLE_FAN primitives in tile meshes. 
  • Fixed an editor crash that occurred when any scale component on Cesium3DTileset was set to zero. 
  • Fixed a bug where CameraFlyToController, after the user interrupted a flight, would jump to the middle of the flight path immediately upon starting the next flight. 

Check the Cesium for Unity changelog for the full list of updates, and follow our Cesium for Unity tutorials to get started. 

Download the Cesium for Unity samples

Cesium ion updates

Cesium ion SaaS 

  • Mesh reconstruction from photos is available as a technical preview. Upload geolocated photos and select the Photos (for 3D reconstruction) option. Read more. 
  • Added the ability to perform analysis on point clouds to produce classified point clouds. Try it with the Analyze button on the asset details panel. Read more. 
  • Gaussian splats is available as a technical preview. Upload a PLY file and enable the Gaussian splats toggle. Read more. 

Reality Tiler 

  • Fixed a rare issue with tile subdivision that could cause unnecessarily deep tileset trees. 
  • Fixed an issue causing a crash for some models with no materials. 
  • Set the mipmap generation option to be off by default. 

Check the changelogs for the full list of updates for Cesium ion SaaS and Cesium ion Self-Hosted.

Sign up for Cesium ionDownload Cesium ion Self-Hosted
Cesium ion “city detector” analylsis tool as seen in Cesium Stories.

Cesium ion “city detector” analysis tool as seen in Cesium Stories.

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