Ver: 7.6.1 (latest now)
Env: Any browser
Playground:
Desc:
face count increase greatly after using subtractInPlace of CSG, in the example above, it shows
faces before csg 3876
faces after csg 29698
Why faces became ~10x more with subtractInPlace? Any way to optimize it?
CSG can create a lot of faces indeed, there’s not much that can be done about it…
You can try to simplify the mesh afterwards:
https://doc.babylonjs.com/features/featuresDeepDive/mesh/simplifyingMeshes
Have tried with simplify with meshoptimizer, but it does not help much, playground:
faces before csg 3904
faces after csg 18335
Does the buildin algorithm of babylon.js performs better than meshoptimizer, in quality or performance?
I would guess it isn’t. It uses quadratic mesh simplification, a pure js implementation. You can try it out (@Evgeni_Popov has provided you with a link for the docs), but if you already have meshoptimizer integrated (which i find impressive 
) I am pretty sure you are well optimized.