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MathGroup Archive 1996

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Re: ParametricPlot3D: shading?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg4453] Re: [mg4368] ParametricPlot3D: shading?
  • From: John Fultz <jfultz>
  • Date: Mon, 29 Jul 1996 02:37:12 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

> I am trying to use ParametricPlot3D in the form
> 
> ParametricPlot3D[{fx, fy, fz, s}, ...]
> 
> where s is a colour specification. I expected that the following two
> commands would give roughly the same output:
> 
> In[3]:= ParametricPlot3D[{x, y, 1, Hue[x]}, {x, 0, 1}, {y, 0, 1}]
> 
> Out[3]= -Graphics3D-
> 
> In[4]:= Plot3D[{1, Hue[x]}, {x, 0, 1}, {y, 0, 1}]
> 
> Out[4]= -SurfaceGraphics-
> 
> But while the second gives a nicely coloured surface, the first does
> not.
:
:
> What am I doing wrong? Or is there a bug?
> 
> James Lawry.

Not a bug, per se, but definitely an assumption that throws a lot of users
off.  By default, ParametricPlot3D uses the lighting model to determine
color, and so all color specifications are ignored.  In order to expose
the color, you need to shut off the lighting.

ParametricPlot3D[{x, y, 1, Hue[x]}, {x, 0, 1}, {y, 0, 1}, Lighting->False]

does the trick.

Sincerely,

John Fultz
jfultz at wolfram.com
Applications Group
Wolfram Research, Inc.

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