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Cesium Releases in September 2026

Matt Schwartz

In this month’s releases, we’re moving vector tiles, clipping polygons, design models, and asset management forward:  

  • This release contains our vector tiles technology preview, representing significant progress towards our implementation of 3D Tiles 2.0. You can now complete end-to-end vector workflows by uploading common vector data file formats into ion for tiling and then streaming those tiles to CesiumJS and Cesium for Unreal. Use the CesiumJS styling language to dynamically style those vectors in your applications. See our blog post for all the details. 
  • We’ve also improved CesiumJS clipping polygons based on similar techniques used in our vector tiles implementation. You can now create detailed clipping regions over large geographic areas. 
  • In the coming days, Cesium ion will introduce new capabilities for working with design models (BIM/CAD with Database), including an API to list the changes between two versions of a model. Keep an eye out for our blog post! The Cesium ion release will also include a new asset management model that separates source files from tiled assets, giving users greater control over storage usage today while laying the foundation for future capabilities, such as retiling data without reuploading source files.
OpenStreetMap road network for Philadelphia City, styled by road class 

The full OpenStreetMap road network for Philadelphia, styled by road class.

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 1.145 release

CesiumJS 1.145 is now available. Highlights of the release include: 

  • As part of the vector tiles technology preview, added support for draping clamped vector tile polygons and polylines onto 3D Tiles, with a new heightReference option and matching read-only property on BufferPrimitiveCollection. You can now drape your vectors onto terrain and 3D Tiles. #13653
  • ClippingPolygons now use an algorithm, based on the techniques used for vector tiles, that vastly improves quality across distance scales. You can now clip regions of the world across multiple miles with accurate vector cutouts. Warm-up cost is also modestly decreased. #13654 
  • ClippingPolygons now have support for specifying holes (aka islands) within each polygon for complex clipping tasks. This works in inverse clipping workflows as well. #13660 
  • Added experimental IonSnapService for server-side snap-to-geometry against Cesium ion assets backed by a BIM/CAD Database model, and the SnapService interface it implements. This enables building features such as measurement of design geometry with CAD-level precision and accuracy. #13682 

For more details, see the changelog.

Download CesiumJS 1.145Open an issue or a PR
A GeoJson footprint of Sweden used as a clipping polygon on the globe, now with support for holes (excluded regions) inside the clipping polygon. 

A GeoJson footprint of Sweden used as a clipping polygon on the globe, now with support for holes (excluded regions) inside the clipping polygon. 

Cesium for Unreal 2.29.1 release

Cesium for Unreal v2.29.1 is now available.

This release updates cesium-native from v0.63.0 to v0.64.0. See the changelog for a complete list of changes in cesium-native. 

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 SamplesOpen an issue or a PR

Cesium for Unity 1.25.1 release

Cesium for Unity v1.25.1 is now available. Highlights of this release include: 

  • Fixed a NullReferenceException that could be thrown if a CesiumCreditSystem was destroyed before it was ever enabled. 
  • Fixed a bug where CesiumCreditSystem would not unsubscribe from delegates on disable, causing duplicate subscriptions when re-enabled. 

In addition to the above, this release updates cesium-native from v0.63.0 to v0.64.0. See the changelog for a complete list of changes in cesium-native. 

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 samplesOpen an issue or a PR

Cesium ion and tilers updates

Cesium ion SaaS

  • Exciting new features for working with design models are coming to Cesium ion this week! Watch for our blog post.
  • In the next few days we will release improvements to how assets are managed in Cesium ion. The source files for tiled data will be managed separately from the tiled assets, which will immediately give users more control over their Cesium ion storage quota. It will unlock more enhancements in future releases, such as the ability to retile without reuploading source files.
    • Note: This change will result in a recalculation of account storage totals. As a result, we will also increase the storage quotas for each Cesium ion tier. Look for more details through email and in your Cesium ion account.
  • Updated the vector tiler to accept new formats. Also changed the enum for the SourceType that runs the vector pipeline from GEOJSON to VECTOR_DATA. Read more in the vector tiles technology preview blog.

Cesium ion Self-Hosted

Cesium ion Self-Hosted 1.11.0 is now available.

  • Added the ability to run self-hosted reconstruction jobs using iTwin Capture. To learn more, contact Cesium sales.
  • Added support for labels.
  • Design tiler: added IfcSpace relations to element properties in IFC metadata.
  • Fixed a bug with features.deleteSources where the sources volume wasn’t being cleaned correctly.
  • Point cloud tiler: fixed an issue where PNTS attributes could have incorrect alignment if compression was turned off.
  • Design tiler: tweaked IFC swept circular geometry for more consistent rotational offsets.
  • Reality tiler: fixed a race condition that could lead to subtree files with content/availability bits incorrectly set to zero.

Vector tiler

  • New vector tiler available as a technology preview.

Design tiler

  • Fixed an issue where texture scales can be wrong when using Meshopt compression.
  • Changed noData value for float-type metadata to -9999.0, from 0. This makes collisions with real metadata values less likely.
Sign up for Cesium ionDownload Cesium ion Self-Hosted
Global river flows dataset from HydroRiver. Showing north American view with fine LODs

Global river flows dataset from HydroRIVER. Showing North American view with fine LODs.

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