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Re: Mathematica Animation Problem
*To*: mathgroup at smc.vnet.net
*Subject*: [mg35447] Re: Mathematica Animation Problem
*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
*Date*: Sat, 13 Jul 2002 03:48:16 -0400 (EDT)
*Organization*: Universitaet Leipzig
*References*: <agm551$5at$1@smc.vnet.net>
*Reply-to*: kuska at informatik.uni-leipzig.de
*Sender*: owner-wri-mathgroup at wolfram.com
Hi,
For[alpha = 0.0, alpha < 2 Pi, alpha = alpha + 0.1,
Plot3D[Exp[-(x^2 + y^2)], {x, -2, 2}, {y, -2, 2},
{ViewCenter -> {0.5, 0.5, 0.5},
ViewPoint -> {5 Cos[alpha], 5 Sin[alpha], 0.5}},
PlotRange -> {{-2, 2}, {-2, 2}, {-0.5, 1}}, SphericalRegion -> True,
Axes -> False
]
]
looks fine. You must switch off the axes labels, other wise the jumping
text labels will modify the center of the image.
Regards
Jens
Tobi wrote:
>
> Dear all,
>
> I hope someone can give me advice concerning the following Mathematica
> (Version 4.1) problem:
>
> I am trying to produce an animation of a circular "walk" around a 3D
> plot. I get the animation, but it looks like sometimes I get nearer to
> the plot and sometimes the plot looks more distant, so that I don't
> get the impression of walking on a circle.
>
> My guess is that I have not yet understood how the options
> "ViewCenter" and "ViewPoint" work.
>
> So here is what I wrote to produce the image sequence:
>
> For [alpha = 0.0, alpha < 2 Pi, alpha = alpha + 0.1,
> Plot3D[ Exp[-(x^2 + y^2)], {x, -2, 2}, {y, -2, 2},
> {ViewCenter -> {0, 0, 0},
> ViewPoint -> {5 Cos[alpha], 5 Sin[alpha], 0.5}}]]
>
> So all viewpoints should lie on a circle of radius 5 around the origin
> and with a constant height of 0.5. But the visual impression is
> different, as decribed above. Anyone knows what's wrong?
>
> Thanks in advance,
> Tobi
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