POV-Ray: Newsgroups: povray.general: Difference/Intersection of meshes

POV-Ray : Newsgroups : povray.general : Difference/Intersection of meshes		Server Time 8 Aug 2024 12:21:51 EDT (-0400)

From: Gigi Giorgi
Subject: Difference/Intersection of meshes
Date: 12 Dec 2000 06:26:24
Message: <3A36098E.F2A152C6@to.alespazio.it>

Hi all,
I had problem with CSG Difference between meshes (smooth_triangles). Two
meshes in CSG operations renders ok if I use Union but if the operator
is Difference or Intersection POV display nothing.
Is it not possible to make a CSG Difference between meshes?
Gigi

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From: Bob H
Subject: Re: Difference/Intersection of meshes
Date: 12 Dec 2000 07:00:48
Message: <3a361370@news.povray.org>

"Gigi Giorgi" <plg### [at] toalespazioit> wrote in message
news:3A36098E.F2A152C6@to.alespazio.it...
> I had problem with CSG Difference between meshes (smooth_triangles). Two
> meshes in CSG operations renders ok if I use Union but if the operator
> is Difference or Intersection POV display nothing.
> Is it not possible to make a CSG Difference between meshes?

Unfortunately triangles have no definite inside/outside when it comes to CSG.
Using MegaPov you have a choice of making a "solid triangle mesh" as stated in
section 5.3 of the documentation.  It needs to be a "mesh" though, not a union
of triangles. And they have to completely close, having no openings.  Well,
almost always.
If you don't know about MegaPov yet look here: http://nathan.kopp.com

Bob H.

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