Michael Lundahl <d93### [at] efdlthse> wrote:
: Avoid merge.

  Why? If I have understood correctly, merge is as fast as union (the only
difference is that the inner surfaces are ignored; this is easyly done
by counting hits on exterior and interior of objects, ie. each time you
hit an object from outside, increase the counter; each time you hit the
object from inside, decrease the counter; ignore all the surfaces you hit
if the counter is >0 after the decrementation or if the counter is >1 after
the incrementation; I suppose povray uses this method, although I'm not sure).

-- 
                                                              - Warp. -

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