MathGroup Archive 2000

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Re: fade to mauve

  • To: mathgroup at
  • Subject: [mg24411] Re: fade to mauve
  • From: Jens-Peer Kuska <kuska at>
  • Date: Tue, 18 Jul 2000 00:58:09 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <8kjesh$>
  • Sender: owner-wri-mathgroup at


thats's because the LightSources are placed arround your head
(in the camera coordinate system) if your camera moves to a 
far place the light source move also. 

You must compute the light sources in world coordinates 
and transform it to the camera coordinates using the 
ViewPoint, ViewCenter and ViewVertical parameter of our
plot. The z-direction is ViewPoint-ViewCenter, the
y-direction ViewVertical. And you must redo the calculation
when your view point changes.

Hope that helps

> When I draw big things and need to use big Viewpoints to get the
> perspective right, they lose their lighting.
> I don't see why it has to be this way.
> Dr. C. J. Purcell

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