How to display underground object (tunnel, plumbing and etc)

CesiumJS
1

1. A concise explanation of the problem you’re experiencing.

I want to build a 3D map that will show underground objects, how do I display underground objects in Cesium?

2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.

4. The Cesium version you’re using, your operating system and browser.

1.65

2

Underground rendering isn’t currently fully supported (there’s a few tricks you can now like clipping out the terrain and visualizing your objects that way), but we are working on it! See this issue for updates: https://github.com/AnalyticalGraphicsInc/cesium/issues/5665