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Re: Problem with 3D Polygon

  • To: mathgroup at
  • Subject: [mg33422] Re: Problem with 3D Polygon
  • From: Jens-Peer Kuska <kuska at>
  • Date: Thu, 21 Mar 2002 09:26:59 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <a79cit$7ug$>
  • Reply-to: kuska at
  • Sender: owner-wri-mathgroup at


Mathematica can't render non-convex polygons in 3d !
You can  triangulate the polygon by hand if you have only
one or you can use


"Kevin J. McCann" wrote:
> When I plot the following
> Graphics3D[{LightBlue,
>         Polygon[{{1,0,0},{1,0,1},{-1,0,1},{-1,0,0},{-1/2,0,0},{-1/2,0,
>               1/2},{1/2,0,1/2},{1/2,0,0},{1,0,0}}]}],Lighting->False,
>     Boxed->False];
> I get just a blue rectangle with some of the boundary drawn, not an inverted
> "U" shape. Can someone explain this please.
> Kevin

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