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Re: [Closed REQ 5065]: geomview question: polygons with holes


  • To: software@geom
  • Subject: Re: [Closed REQ 5065]: geomview question: polygons with holes
  • From: "Mark Phillips" <mbp>
  • Date: Mon, 26 Sep 94 15:01:55 -0500


> Suppose my 3D object looks like a cube with a hole drilled through it.
> Thus, the top face and bottom faces of this object are indeed a
> polygons with a hole.  Is there any way for me to display my object
> using geomview?

Yes.  You just have to represent the faces containing the hole with
a union of holeless polygons.  E.g. a square with a square hole
could be split into two pieces as follows:


     _________
    |        /|
    |  _____/ |
    | |	    | |
    | |     | |
    | |_____| |
    | /       |
    |/________|


In fact, for this simple example you could actually represent this with
the following single polygon, two of whose edges happen to be the
same edge (the diagonal line).

     _________
    |        /|
    |  _____/ |
    | |	    | |
    | |     | |
    | |_____| |
    |         |
    |_________|


--Mark


 
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