I have a problem with collisions. The thing is that the collisions that are created on tiles are very bad, with inaccurate shapes. Can I create my own collisions for buildings and objects on tiles?
What version of Cesium for an Unreal are you using? This was a common issue prior to v2.7.1, but we’re not aware of any current problems with collisions. If you’re still seeing problems after that version, can you help us to reproduce to the problem ourselves?
To answer your actual question: you can’t change the collision shapes for tiles, but you can turn off collision with them entirely by unchecking the “Create Physics Meshes” property on the Cesium3DTileset. Then, you can create your own collision shapes separately.