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Constructive Geometry on Imported Meshes - CSG

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I am trying to perform a Boolean subtraction operation on an imported Mesh (skull.babylon).  I have downloaded the demo from Babylon CSG.



 The operation seems to work on native meshes, but not on imported meshes.  Has anyone tried this before?

I used the loader to bring in the mesh, and then tried to reference it in the subtraction operation.

So far, no luck



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Booleen operations are geometry dependant, of course. I have discovered many booleens that either don't subtract, or produce unusable results. The more complex and edge vertices, the more computation is required - and will often reach a point where the result cannot rectify. Booleens are quite tempormental operations, and I generally avoid them until there is no other option left to produce a desired result. Perhaps this is old school carefulnes, but they are definately computationally heavy and quite often produce undesired artifacts.

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