Update CSG to use manifold.js

[fire]

Use boolean operators (subtract, add, and divide) from the manifold https://github.com/elalish/manifold library

[fire]

OpenSCAD, IFCjs, Grid.Space, and OCADml have all integrated our Manifold geometry kernel! Why? Because its reliability is guaranteed and it's 1,000 times faster than other libraries. See our elalish/manifold#340 and elalish/manifold#383 discussions for all the latest and to add your own projects & analyses.

[frading]

Yes, that'd be great to have.

Manifold is already in use in Polygonjs, with the sop/SDFBuilder node ( source ). I had also started a boolean node using it, but did not complete it.

I should mention that there are already 3 boolean nodes, each with pros and cons:

• sop/CADBoolean, based on opencascade

• sop/CSGBoolean, based on jscad

• sop/Boolean, based on three-bvh-csg

• CADBoolean is the most powerful, but relies on a wasm that's about 9mb. So this is can be used for CAD editors, but not for landing pages which need to load fast.

• CSGBoolean works well, but can only operate on the jscad datastructure, not threejs geometries

• boolean works very well, and is regularly being improved.