Clipping concave polygons

I need to cut concave polygons from photogrammetry 3D tiles model. I know that question has been asked before and one answer says there are some clipping plane improvements allow to do it, but I haven’t find them. So is it possible to cut concave polygons?

Welcome to the Cesium Community @liyunxiao! This isn’t currently possible but we have a feature request for this here:

What kind of project are you working on? Are you trying to replace buildings in your photogrammetry?