Is there a way to cut a mesh- not dynamically, just remove parts of it to add to the graphics? Simple stuff like removing a rectangle from a wall to make way for an opening in a door. I am aware we can already cut holes in terrains.
This is broadly called CSG:
Constructive solid geometry (CSG; formerly called computational binary solid geometry) is a technique used in solid modeling. Constructive solid geometry allows a modeler to create a complex surface or object by using Boolean operators to combine simpler objects, potentially generating visually complex objects by combining a few primitive ones.
In 3D computer graphics and CAD, CSG is often used in procedural modeling. CSG can also be performed on polygonal meshes, and may or may not be procedura...
There is some support in ProBuilder for this.
It will almost always be easier to pre-author your content than to try and write code to author it on the fly.
I guess I will have to check it out, then.