Cesium Brings KHR_gaussian_splatting Support to CesiumJS and Unreal Engine

When the Khronos Group announced the KHR_gaussian_splatting release candidate in February 2026, Cesium was already named as one of the early adopters committed to implementing the standard. That commitment is now code. Cesium’s March 2026 release cycle delivered KHR_gaussian_splatting extension support simultaneously in two major products: CesiumJS 1.139 and Cesium for Unreal v2.23.0.

The KHR_gaussian_splatting extension, developed with contributions from Cesium/Bentley Systems, Autodesk, Esri, Huawei, Niantic Spatial, NVIDIA, and XGRIDS, defines how 3D gaussian splats can be stored and delivered as part of a glTF 2.0 asset. Technically, each splat is represented as a specialized mesh primitive with position, orientation, scale, color, and opacity attributes – the renderer then interprets these not as polygons but as the ellipsoidal kernels that give gaussian splatting its distinctive visual quality. By treating splats as a first-class glTF primitive type rather than a proprietary format, the extension enables gaussian splat data to flow through the same interoperable pipelines already used for conventional 3D content.

Cesium’s position as an early adopter matters particularly because of the platform’s footprint in geospatial and infrastructure visualization. CesiumJS is the engine underlying a significant portion of enterprise and government 3D geospatial work, from urban digital twins to satellite imagery fusion. Adding gaussian splat support to that ecosystem means captured environments can now be delivered alongside traditional photogrammetry and 3D Tiles content as part of the same tileset pipeline. The March 2026 update also fixed a rendering issue where multiple gaussian splat primitives caused visible flashing.

The Unreal Engine integration is an equally significant data point. Cesium for Unreal has established itself as the primary bridge for delivering geospatial 3D Tiles content into Unreal Engine scenes, and its v2.23.0 release extends that same capability to KHR_gaussian_splatting tilesets. This opens a path for workflows that were previously cumbersome, such as large scale captured environments, originally processed as gaussian splats, can now be streamed directly into Unreal Engine scenes using Cesium’s tiling and LOD infrastructure, without requiring manual format conversion.

The Khronos standard itself is still working through its final ratification process, with formal approval currently targeted for Q2 2026. Cesium shipping production support before that milestone suggests confidence in the release candidate’s stability.

Full details on the March 2026 Cesium releases are at the Cesium blog, and for background on the KHR_gaussian_splatting extension itself, see our earlier coverage of the Khronos announcement.