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MathGroup Archive 1997

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Re: Lighting, SurfaceColor, and Graphics3D..

  • To: mathgroup at smc.vnet.net
  • Subject: [mg5877] Re: [mg5721] Lighting, SurfaceColor, and Graphics3D..
  • From: sherod at newton.Colorado.EDU (Scott Herod)
  • Date: Sun, 2 Feb 1997 01:31:43 -0500
  • Organization: /usr/local/lib/rn/organization
  • Sender: owner-wri-mathgroup at wolfram.com

Stan Wagon just showed me a trick to do this.  With Mma 3.0 you can
specify the normal vector of a polygon overriding its true normal.
The trick is then to find a value for the normal which will have it
point in the direction to receive a given shading.  Check the 
yellow (?) book titled something like "Graphics in Mathematica" 
for the normal specification.

Scott Herod
(sherod at newton.colorado.edu)

In article <5cg4b8$t34 at smc.vnet.net> george at mech.seas.upenn.edu ( George Jefferson ) writes:
>Is it possable to have a 3d graphic with Lighting->True,
>but explicitly specify the color of a particular polygon?
>
>I tried creating a figure with lighting->true and another
>with lighting->false and combining them with one Show.
>No good, the lighting->true overrides.
>
>I thought you should be able to do it with a SurfaceColor specification,
>but that doesn't seem to have the flexability to say 'ignore the
>lighting and just set the color'
>
>Ideas?
>
>
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