Constructive Geometry on Imported Meshes - CSG

[ancientholiday]

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

 

Demo: http://www.babylonjs-playground.com/#NZPX4

 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

 Thanks

indexCSG.html

[adam]

I couldn't get it to work either:

http://www.babylonjs-playground.com/#XA6F3#1

It doesn't make it through:

var aCSG = BABYLON.CSG.FromMesh(a);

http://www.babylonjs-playground.com/#XA6F3#4

 

[dbawel]

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.

[ancientholiday]

If the boolean does not work then I would like another way to do a cross-section of a group of meshes.  Can this be achieved by making something transparent beyond a plane?

[Gijs]

Better late than never: turns out the problem here is that the skull doesn't have its UVs set:

http://www.babylonjs-playground.com/#XA6F3#10