Projected outline

I need an outline of the 3d tileset onto the terrain underneath it.
Is there any tools within CesiumJS to create a projection of the 3d tile outline onto the terrain?

Any ideas/suggestions on how this might be accomplished are appreciated.

debugShowBoundingVolume? Model - Cesium Documentation

Bounding volume is a very rough approximation.
I was hoping for like something more precise that follows the polygon edges of the model.