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gkjohnson / three-bvh-csg

A flexible, memory compact, fast and dynamic CSG implementation on top of three-mesh-bvh
MIT License
621 stars 48 forks source link

Keep root operand's material groups in boolean result? #132

Closed cptSwing closed 1 year ago

cptSwing commented 1 year ago

This isn't a bug, so please excuse me if this isn't the right place to ask!

Basically I am trying to bool shapes with useGroups = true, with the caveat that the resulting shape should retain the original material allocations - meaning, if I have a multi-material Mesh as root operand, and I subtract from it, I'd like the resulting carved-out portion to not have another, extra material, but to keep the respective materials assigned to the boolean root.

I've whipped up a quick CSB to demonstrate what I mean: https://codesandbox.io/s/eager-shamir-5zk5zf?file=%2Fsrc%2Findex.js

Instead of the having the faces of the square set to wholly different material, I'd like the red, green, hotpink materials to persist in the carved-out portion. Would it be possible to somehow take the underlying root's materials into account somehow?

Thanks for any pointers!

gkjohnson commented 1 year ago

How are you expecting this to look? There's no obvious way to apply the materials to the subtracted objects in a general case.