"Chris B" <nom### [at] nomail com> wrote:
> It turns out to be a lot quicker to create a small block with a hole in it
> and assemble those blocks.
> Mike Williams has written up a choice of solutions to this problem at
> http://www.econym.demon.co.uk/holetut/index.htm
I *think* it should also speed things up if you don't subtract individual holes,
but multiple unions of holes - or maybe even unions of unions of holes. The idea
is to enforce a nested hierarchy of bounding boxes this way, which is what's
actually missing with a difference containing hundreds of individual objects.
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