Re: Clipping point generation

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#29

From: Wm Randolph Franklin
Date: Wed, 20 Jan 1993 23:17

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In article <11757@sun13.scri.fsu.edu> on 19 Jan 93 15:17:41 GMT,
danielbt@cs.curtin.edu.au (Brett Daniel) writes:

  > Can you describe a convex polygon that intersects all six clipping planes?

Let the clipping polyhedron be the cube with grand diagonal (0,0,0) to
(1,1,1).  The plane x+y+z=3/2 should intersect all 6 faces, if I've done
my math right.  The intersection polygon is a hexagon. Make your
clippable polygon a hexagon in that plane with a vertex just outside
each clip plane, i.e rotated 30 degrees wrt the intersection polygon.
Clipping the clippable polygon should make a dodecagon.

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Wm. Randolph Franklin,  wrf@ecse.rpi.edu, (518) 276-6077;  Fax: -6261
ECSE Dept., 6026 JEC, Rensselaer Polytechnic Inst, Troy NY, 12180 USA

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From: wrf@ecse.rpi.edu (Wm Randolph Franklin)
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Subject: Re: Clipping point generation
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Date: 20 Jan 93 23:17:37 GMT
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