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Re: SphericalPlot3D ColorFunction problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg104720] Re: SphericalPlot3D ColorFunction problem
  • From: Peter Breitfeld <phbrf at t-online.de>
  • Date: Sat, 7 Nov 2009 07:02:02 -0500 (EST)
  • References: <hd0spr$7jb$1@smc.vnet.net>

Porscha Louise McRobbie wrote:

> Hello,
>
> Can anyone explain why the following simple plot is a single color?
>
> SphericalPlot3D[Abs[Cos[t]], {t, 0, Pi}, {p, -Pi, Pi},
>   ColorFunction -> Function[{t}, Hue[Arg[Cos[t]]/(2. Pi)]],
>   ColorFunctionScaling -> False]
>
> Arg[Cos[t]]/(2. Pi)] should be zero for t<Pi/2, and 0.5 for t>Pi/2, so  
> I expect the the upper lobe of the plot to be red (Hue[0]) and the  
> lower lobe to be cyan (Hue[0.5]).  Is there something different about  
> ColorFunctions in SphericalPlot3D compared with Plot3D?
>
> Any help is greatly appreciated!
>
> Porscha
>

If you look at the options section of Spherical Plot, you will see, that
in the general case ColorFunction has to be a function of 6 variables
like Function[{x,y,z,z,theta,phi,r}, stuff]

-- 
_________________________________________________________________
Peter Breitfeld, Bad Saulgau, Germany -- http://www.pBreitfeld.de


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