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MathGroup Archive 2007

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Re: Animation of a rotating object. (Mathematica 6)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg80760] Re: Animation of a rotating object. (Mathematica 6)
  • From: "Wim W. Wilhelm" <wilhelm at euronet.nl>
  • Date: Sat, 1 Sep 2007 00:23:01 -0400 (EDT)
  • References: <fb83p8$849$1@smc.twtelecom.net>

In version 6. you might do the 
following:
Manipulate[{Plot3D[Sin[x y], {x, -5, 5}, 
{y, -5, 5}, MaxRecursion -> 1,
PlotPoints -> 50, Mesh -> None, Boxed -> 
False,
ViewPoint -> {x, y, 2}]}, {x, -2, 2}, 
{y, -2, 2}]

Regards.

Wim W. Wilhelm






"Nacho" <ncc1701zzz at gmail.com> wrote in 
message 
news:fb83p8$849$1 at smc.twtelecom.net...
> Hello.
>
> I'm trying to make an animation of a 
> rotating 3D object and I'm having
> some problems.
>
> I want to make a list of images to 
> export them to an AVI file.
>
> For example, the following object:
>
> a = Plot3D[Sin[x y], {x, -5, 5}, 
> {y, -5, 5}, MaxRecursion -> 1,
>   PlotPoints -> 50, Mesh -> None];
>
> I want to rotate it around the z axis 
> slowly. I've tried Rotate and
> changing ViewPoint, but neither work 
> for me because Rotate distorted
> the scale of every image and changing 
> ViewPoint only works if I want
> to rotate everything at the same time.
>
> I think that I should use Rotate, so I 
> can Rotate several objects in
> different angles or speeds. But I 
> would like to avoid the distortion
> in the size of the image:
>
> I've tried specifying PlotRange, and 
> it looks promising, but I have
> two problems: calculating the best 
> PlotRange paramters so everything
> is included, and maximizing the 
> plotted area (so the white region
> around the objects is minimized).
>
> This is close, but a lot of white 
> space is around the object, and I
> have to set the limits of PlotRange by 
> try-and-see.
>
> b = Table[
>  Graphics3D[Rotate[a[[1]], phi, {0, 0, 
> 1}], Boxed -> False,
>   PlotRange -> {{-7, 7}, {-7, 7}, {-1, 
> 1}}], {phi, 0, 1/4 Pi,
>   1/4 Pi /5}]
>
>
> Any hint to do this?
>
> The object doesn't need to be this 
> particular Plot3D. It could be a
> ParametricPlot3D, several Graphics3D 
> primitives, etc.
>
> Thanks a lot.
>
> Best regards.
>
> 




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