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Mathematica Animation Problem


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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