Operation should be fast when brushes are not intersecting / near each other

[gkjohnson]

Test with bunny meshes in simple example

[gkjohnson]

Matrix transforms can happen multiple times. Would be good to do this just once and use the indices to get and use the post-transformed data. Effectively the geometry still has to be transformed even though no intersections have happened.

Could also early out and copy of it's the case that no geometry intersects.

[gkjohnson]

Might not be so simple. Matrix transformations still need to happen and there are still cases where operations occur even though no intersections have happened.