Add RGB colors to 3D buildings

[Ed_]

Nowadays, rendering 3D buildings via a LiDAR point cloud is doable in ArcGIS Pro 3 but, the direct 3D rendering is very vanilla as the building 3D assets are colorless cubes.

My purpose is to add a little bit of more realism to these 3D objects using ArcGIS Pro and to not rely on other tools like Unreal Engine 5 (and I don't even know that whether exported 3D assets from UE5 are compatible with ArcGIS Pro at the moment).

If I have the following vanilla looking buildings, how can make them look a bit more realistic by adding RGB colors etc?

I do have representative high-resolution imagery (RGB) of the area if it's needed to collect color information.

Current output: