I have several Box Entity and Building GeoJson polygon data. and I want check some Box that overlaped or intersected with building. But I can’t Find any reference or examples.
If you know something, Please share it with me.
Welcome to the community! 
This is somewhat of a recurring question and unfortunately, I do not have a robust answer for you at the time. Do other community members have any suggestions? I will also check in with the rest of the Cesium development team. For now, I recommend checking out the following community forum thread.
Let me know if you have any other questions or concerns. More information on your intended use case and your overall project would also be helpful.
-Sam