spatial server that supports 3d tile (like geoserver)

Is there a “spatial server” that can connect with “cesium js” and support 3d tiles? (like geoserver)

I want to visualize 3D data directly from “post gis” in closed network.

What type of data are you trying to visualize? If it’s any of the formats shown on this page:

Then you could use the on-premise version of the Cesium ion server & 3D tiling pipeline: