clamp_to_ground doesn't work, point can't clamp to 3dtile

[YHLpuyu]

What happened?

I add a entity with point, and set heightReference to CLAMP_TO_GROUND, in scene i add both terrain and 3dtile, but the entity is just clamp to terrain not 3dtile. the sandbox clamp to ground

Reproduction steps

1. add terrain
2. add 3dtile
3. add entity with points
4. set heightReference of point to CLAMP_TO_GROUND

Sandcastle example

https://sandcastle.cesium.com/index.html#c=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

Environment

Browser: CesiumJS Version: Operating System:

[YHLpuyu]

Browser: Microsoft Edge 125.0.2535.51 x64 CesiumJS Version: 117 Operation System: win10 home 22H2

[ggetz]

Hi @YHLpuyu, clamping is not enabled on all 3D Tiles by default for performance reasons. You'll need to provide the option enableCollision: true.

See this updated example.