Point on the 3D Tiles represented by the root transform matrix

CesiumJS
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How is your 3D Tileset created? If you’re using Cesium ion, this thread has some information on this: How to correctly position 3D models when tiling with Cesium ion. The origin will be re-computed to be the center of the geometry, unless you’re using the REST API, which will retain the origin in the original coordinate system.