1. A concise explanation of the problem you're experiencing.
I am able to clamp KML and COLLADA data types to Cesium World terrain,
but then i uploaded the 3D tiles files there is no choice to clamp the models to the terrain.
Due to this the buildings are located below the terrain when Cesium World terrain are selected.
Is there any method on how to do this?
2. Context. Why do you need to do this? We might know a better way to accomplish your goal.
I need to do this so that the buildings are not located below the Cesium World Terrain