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Exporting video of simulation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg116718] Exporting video of simulation
  • From: Gabriel Landi <gtlandi at gmail.com>
  • Date: Fri, 25 Feb 2011 06:33:59 -0500 (EST)

Hey guys,

I've been using Mathematica to do the following:

(1) Import data values from a simulation done in a different software.
Simulation is basically solving a ODE.
The data has the form (t, x1, x2, x3, ...)

(2) I then use this data to make a ParametricPlot3D of (x1(t), x2(t),
x3(t)). I Use function interpolation which works pretty well.

(3) Now... what I really want is to make a video of this parametric 3D plot
as a function of time. i. e., the 3D curve is drawn with time in the video.
So far, the best I have come up with is to create a Manipulate Object and
then export it (almost aways to quicktime .mov even though the format
doesn't matter).
I also plot alongside the 3D plot a 2D graph of one of the components.

The problem is: making the video takes alot more time than the simulation.
It takes over 1/2 hour.

The reason, which I believe it is, is that each frame is constructed by
completely re-ploting the graph.
In other words, if one frame has the plot from t0 to t1 and the next has the
plot from t0 to t2, then Mathematica makes 2 different graphs.

I was wondering if there was a way to "AppendTo" the plot so he doesn't
construct a new graph object.

Also, overall, I am kindly asking for any tips you guys might have on this
subject.

Notebook is given below. It has been condensed into a single function which
takes as only parameter the part of the file name that I want to produce the
video (I have several files named sequentially).
File is also pretty big, around 30 MB and so the line
*data = Take[import, {1,-1,2000}] *
is used to make it a little bit lighter.

Thank you all in advance.

Gabriel



videoer[i_] :=
 Module[{data, ani, t0, fx, fy, fz, t, t2, tf, dt, T, import, h, opt},

  opt = {LabelStyle -> Directive["Times", 16],  Frame -> True,
    FrameStyle -> Directive[16, "Times"]};

  import =
   Most[Drop[Import["h0_" <> ToString[i] <> "-phi_0.dat", "Table"], 2]];
  data = Take[import, {1, -1, 2000}];
  Print["Import Done"];
  t0 = data[[1, 1]]; t2 = data[[2, 1]]; tf = data[[-1, 1]]; dt = t2 - t0;
  fx = Interpolation[data[[All, {1, 2}]]];
  fy = Interpolation[data[[All, {1, 3}]]];
  fz = Interpolation[data[[All, {1, 4}]]];

  h = Interpolation[data[[All, {1, 8}]]];

  ani = Manipulate[Grid[{{

       Plot[{h[t], fz[t]}, {t, t0, T},
        PlotRange -> {{t0, tf}, If[i <= 1, {-1, 1}, {-i, i}]},
        ImageSize -> 250, PerformanceGoal -> "Quality", opt,
        PlotStyle -> {Directive[Black, Thickness[0.007]], Red}],

       Show[
        Graphics3D[{

          Style[Sphere[{0, 0, 0}, 0.2], Red],
          {Black, Arrowheads[0.05],
           Arrow[Tube[{{0, 0, 0}, {fx[T], fy[T], fz[T]}}]]},
          Line[{{0, 0, -1.5}, {0, 0, 1.5}}],
          Line[{{0, -1.5, 0}, {0, 1.5, 0}}],
          Line[{{-1.5, 0, 0}, {1.5, 0, 0}}]

          }, Boxed -> False,
         PlotRange -> {{-1.5, 1.5}, {-1.5, 1.5}, {-1.5, 1.5}},
         ViewPoint -> {Pi, Pi, 1}
         ],

        ParametricPlot3D[{fx[t], fy[t], fz[t]}, {t, t0, T},
         MaxRecursion -> Infinity, PerformanceGoal -> "Quality"]

        , ImageSize -> 400]

       }}]
    ,
    {T, t2, tf}, Bookmarks -> {"start" :> (T = t2), "stop" :> (T = tf)}];
  Print["Manipulate Object Construction Complete"];

  Export["./Videos/vid_H_" <> ToString[i] <> ".mov", ani,
   "AnimationDuration" -> 20., "FrameRate" -> 15.]
  ]


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