When I look at the same place again after the camera leaves, the terrain will be deleted, and I want those places not to be deleted after the camera leaves or I can customize the deletion time
Hi @a87645507,
Tile unloading is controlled by the “Maximum Cached Bytes” property. If you increase this, your application will use more memory, but tiles will be less likely to unload when they’re not visible.
You may also benefit from enabling the “Forbid Holes” option on the Cesium3DTileset.