On 07/06/2011 9:24 AM, Michael Friendly wrote:
Two questions related to creating animated movies with rgl:
1. I've created an rgl scene with 5 different views I want to display in
a movie, but I'd like to insert pauses (say, 5 seconds)
at each view. How can I do this?
I first created 5 userMatrix's, then
play3d( par3dinterp( userMatrix=list(M1, M2, M3, M4, M5)),
,duration=2*60/5) )
then tried simply repeating each twice,
play3d( par3dinterp( userMatrix=list(M1, M1, M2, M2, M3, M3, M4, M4, M5,
M5)), ,duration=2*60/5) )
but that didn't give the desired effect. I see that play3d() has a
times= argument, but the documentation
doesn't indicate how to use it in this context.
Something like this works:
play3d(par3dinterp(times=c(0,5,6,11,12,17),
userMatrix=list(m1,m1,m2,m2,m3,m3),
method="linear"))
The "linear" says to use linear interpolation between time points, so it
will stay exactly constant when the userMatrix doesn't change. If you
leave it out, it uses spline interpolation, and that gives some
irritating overshooting.
2. With movie3d(), I can get an animated .gif, but I wonder if there are
other movie formats (.mov, .mpg) I can get,
either with convert, or an external tool, e.g., so I can embed a movie
in a LaTeX -> .pdf document using the
movie15 package.
e.g., I tried using convert at in a command prompt window,
> convert -delay 1x8 coffee-av3D-1*.png coffee-av3D-1.mov
but it seems that only one frame was used.
I don't know what formats convert handles these days. I used ffmpeg to
put together an mp4 movie a while ago. The command line was
ffmpeg -b 2400000 -r 24 -i movie%03d.png -s xga movie.mp4
That is: a bitrate of 2.4 million bits per second, showing at 24 frames per second,
frames named movie001.png etc, output size 1024x768 ("xga" size) in file
movie.mp4.
Duncan Murdoch
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