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Re: Re: Re: Scalar plot in 3D

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96647] Re: [mg96473] Re: [mg96409] Re: Scalar plot in 3D
  • From: Franco Milicchio <franco.milicchio at gmail.com>
  • Date: Wed, 18 Feb 2009 04:24:00 -0500 (EST)
  • References: <gn11bt$7tg$1@smc.vnet.net> <200902130841.DAA26539@smc.vnet.net> <153706.1234601261285.JavaMail.root@m02> <000001c98e9a$41b57a90$c5206fb0$@net>

On Feb 14, 2009, at 12:49pm, David Park wrote:

> Franco,
>
> Most of the color gradient functions have a scale that goes from 0  
> to 1. For
> precise control you can use ColorFunctionScaling -> False, and then  
> use
> Rescale on the coloring variable to make it fit that domain.
>
>
> David Park

Thanks, this did the right job! This is my code given radii r and R,  
and a list { {u, v}->scalarValue }:

ParametricPlot3D[
  {
   {(R + r*Cos[v]) Sin[u],
    (R + r*Cos[v]) Cos[u],
    r*Sin[v]}},
  {u, 0, 2 Pi},
  {v, 0, 2 Pi},
  ColorFunction -> Function[{x, y, z, u, v}, Hue[First[Nearest[vals,  
{v, u}]]]],
  ColorFunctionScaling -> False,
  Mesh -> 19,
  MeshStyle -> Gray
  ]


I rescaled the field with Rescale[] as you suggested. Do you have any  
suggestion on how to improve this code?

-- 
Franco Milicchio <franco.milicchio at gmail.com>

DiS - Dept. of Studies on Structures
DIA - Dept. of Computer Science and Engineering
University Roma Tre
http://plm.dia.uniroma3.it/milicchio/



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