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MathGroup Archive 2001

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ParamtricPlot3D

  • To: mathgroup at smc.vnet.net
  • Subject: [mg32119] ParamtricPlot3D
  • From: Erich Neuwirth <erich.neuwirth at univie.ac.at>
  • Date: Fri, 28 Dec 2001 02:41:34 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

when displaying s sphere with

ParametricPlot3D[{Sin[u]*Cos[v],Cos[u]*Cos[v],Sin[v]},{u,-Pi,Pi},{v,-Pi,Pi}]

the resultig display does NOT have a convex surface.

and so does
ParametricPlot3D[{Sin[u]*Sin[v],Cos[u]*Sin[v],Cos[v]},{u,-Pi,Pi},{v,-Pi,Pi}]

in the second case, in the horizontal crosscuts
ther points go "in and out", one is close, ons is farther next is closer
...
to the center.

since i want to create 3d objects in other programs,
this is not good.

setting PlotPoints higher 
does not completely solve the problem.
is there an easy solution?

--
Erich Neuwirth, Computer Supported Didactics Working Group
Visit our SunSITE at http://sunsite.univie.ac.at
Phone: +43-1-4277-38624 Fax: +43-1-4277-9386


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