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Re: Sub-division of surface plotting by PlotPoints->{m,n}

  • To: mathgroup at smc.vnet.net
  • Subject: [mg85748] Re: Sub-division of surface plotting by PlotPoints->{m,n}
  • From: Narasimham <mathma18 at hotmail.com>
  • Date: Thu, 21 Feb 2008 17:54:15 -0500 (EST)
  • References: <fp675t$5ao$1@smc.vnet.net> <fp98qe$11t$1@smc.vnet.net>

On Feb 17, 4:20 am, Jens-Peer Kuska <ku... at informatik.uni-leipzig.de>
wrote:
> Hi,
>
> a) your surface has *no* "straight edge"
> b)
>     ParametricPlot3D[{u Cos[t], u Sin[t], t}, {u, 1, 2}, {t, 0, 2 Pi},
>   Mesh -> All, PlotPoints -> {4096, 4096}]
>
> will create more polygons in the polygonal approximation than you
> will need.
>
> Regards
>     Jens
>
> Narasimham wrote:
> > I need to further sub-divide some skew quadrilaterals dividing each
> > side again, say into 10 sub-divisions for each straight edge.Thanks in
> > advance for such an  indication.
>
> > ParametricPlot3D[ {u Cos[t], u Sin[t], t}, {u,1,2}, {v,0,Pi},
i.e.,actually ParametricPlot3D[ {u Cos[t], u Sin[t], t}, {u,1,2}, {t,
0,Pi},
> > PlotPoints-> {2,3} ]
>
> > Narasimham

Thanks to you and David Park.

I meant {2,3} subdivision points and incorrectly put in the same
numbers for PlotPoints. Actually I wished to post

<<RealTime3D`
ParametricPlot3D[{u Cos[t],u Sin[t],t},{u,1,2},{t,0,2 Pi},PlotPoints-
>{3,4}]
which has 2 X 3 = 6 skew quadrilaterals with total all 8 straight
edges.

 Right?

Narasimham


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