For animations where the function is changing this is a good idea as
we haven't implemented efficient communication with Jmol yet. For
things like spinning, zooming, etc...that functionality is in the 3-D
Jmol applet used for default 3-D display in the notebook.
Jmol can do animation with user control of frame rate and the ability
to step back and forth, it just requires building the input data
sets. Nobody has done that yet.
Jonathan
On Sep 25, 8:02 am, Aielyn <coolrun...@excite.com> wrote:
> I feel I should start by noting that I'm new to Sage itself, and I'm
> no developer.
>
> Anyway, one thing that I immediately looked for upon compiling Sage on
> my system was a way to animate plots. For 2D plots, it was simple, of
> course. But I was concerned when I saw that there was no animation
> functionality for 3D plots.
>
> Having a little bit of experience with coding in python, and using a
> bit of simple initiative, I figured out that 3D animation using
> Tachyon in Sage is actually quite trivial (at least in Notebook mode),
> in that it follows the exact same code approach used for 2D animation
> - indeed, no need to even specify Tachyon, as it seems to default to
> that when using the png-generation function that is used by animate.
>
> Anyway, I suppose I'm wondering why such a simple functionality has
> not been added to Sage, yet?
>
> Here's how it works:
>
> def png3d(G, dir=None):
> d = sage.misc.misc.tmp_dir()
> for i, frame in enumerate(G):
> filename = '%s/%s'%(d,sage.misc.misc.pad_zeros(i,8))
> frame.save(filename + '.png')
> return d
>
> def gif3d(animset, delay=20, savefile=None, iterations=0,
> show_path=False):
> if not savefile:
> savefile = sage.misc.misc.graphics_filename(ext='gif')
> if not savefile.endswith('.gif'):
> savefile += '.gif'
> savefile = os.path.abspath(savefile)
> d = png3d(animset)
> cmd = 'cd "%s"; sage-native-execute convert -delay %s -loop %s
> *.png "%s"'%(d, int(delay), int(iterations), savefile)
> from subprocess import check_call, CalledProcessError
> try:
> check_call(cmd, shell=True)
> if show_path:
> print "Animation saved to file %s." % savefile
> except (CalledProcessError, OSError):
> print ""
> print "Error: ImageMagick does not appear to be installed.
> Saving an"
> print "animation to a GIF file or displaying an animation
> requires"
> print "ImageMagick, so please install it and try again."
> print ""
> print "Seewww.imagemagick.org, for example."
>
> def animate3dshow(animset, delay=20, iterations=0):
> gif3d(animset,delay = delay, iterations = iterations)
>
> Most of this code is just directly from Sage's animate.py, with
> appropriate changes. All the comments, obviously useless parts (in
> context), etc, have been stripped away, so I could test it quickly. It
> produces 3D animations using tachyon, and outputs them in the
> notebook, just as desired.
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