animations of raytraces of 3d plots.
Christopher Olah
I've been trying to make animations of Tachyon raytraced 3d plots, so
that people can see a plot from multiple angles without java. (It
could also be used to visualise a forth dimension...) None of my
attempts have worked....
The best strategy I've had was:
sage: b = parametric_plot3d((u^2, v, u*v), [u, -1, 1], [v, -1, 1],
viewer='tachyon')
sage: animate([b.rotateY( 2*pi*(j/6) ) for j in range(6)])
But that didn't work either... I seem to be over my head in the
internal magic of sage. Can someone help me?
Thanks,
Christopher
Robert Bradshaw
Animate doesn't understand 3d graphics objects. This shouldn't be too
hard to fix, is anyone working on that?
- Robert
Christopher Olah
at least, I'm not trying to...). I'm passing a list of images of a 3d
object.
The problem is that I'm having trouble geting that list. I'm trying to
use Tachyon to render images, but... It's not working very well.
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Jason Grout
My guess is that since http://trac.sagemath.org/sage_trac/ticket/2872
has been merged, the above code will work in sage 4.3.3. Does anyone
have an alpha they can try it in? You might have to fiddle with the
viewer='tachyon' bit, though.
Thanks,
Jason
Marshall Hampton
than animate as long as animate is just using imagemagick. You need
to save the image files with sequential names. I can post an example
if you are interested.
-Marshall Hampton
On Feb 17, 2:33 pm, Christopher Olah <christopherolah...@gmail.com>
wrote:
> I think you misunderstand. I'm not passing a 3d object to animate (or
> at least, I'm not trying to...). I'm passing a list of images of a 3d
> object.
>
> The problem is that I'm having trouble geting that list. I'm trying to
> use Tachyon to render images, but... It's not working very well.
>
> On Wed, Feb 17, 2010 at 1:52 PM, Robert Bradshaw
>
Jason Grout
> I recommend using ffmpeg for stuff like that, it will do a better job
> than animate as long as animate is just using imagemagick. You need
> to save the image files with sequential names. I can post an example
> if you are interested.
Someone might be interested in reviewing #7298: use html5 video tag for
animations:
"The attached patch adds support for creating Ogg Theora videos from
animation objects.
The resulting video files are embedded into the notebook using the html5
video tag. "
Thanks,
Jason
Marshall Hampton
review that and got stuck/frustrated with compilation problems. I
encourage someone else to give it a try. I think it might be easier
on linux than OS X (I usually do development work on OS X, especially
for notebook related work).
-Marshall
Christopher Olah
> I recommend using ffmpeg for stuff like that, it will do a better job
> than animate as long as animate is just using imagemagick. You need
> to save the image files with sequential names. I can post an example
> if you are interested.
Sure.
calc...@aol.com
tachyon over a cluster?
TIA,
A. Jorge Garcia
http://calcpage.tripod.com
Teacher & Professor
Applied Mathematics, Physics & Computer Science
Baldwin Senior High School & Nassau Community College
Marshall Hampton
things is the zero-padding of file names, e.g. in the line "fname =
prelabel + '0'*(3-len(str(i)))+str(i)":
def tachbs(p, th = .2, fade = 1.0, xres = 500, yres = 500, **kwds):
c_center = [2*max([q[i] for q in p.vertices()]) for i in range(3)]
c_center[0],c_center[1] = c_center[0]*cos(th)+c_center[1]*sin(th),-
c_center[0]*sin(th)+c_center[1]*cos(th)
t = Tachyon(xres = xres, yres = yres, camera_center = c_center,
**kwds)
lightc = [x for x in c_center]
lightc[2] += 5
t.light(lightc,.5,(1.0,0.0,1.0))
t.texture('mattered',color = (1.0,0,0), ambient = .2*fade, opacity
= 1.0*fade, diffuse = .8*fade)
t.texture('matteblue',color = (0,0,1.0), ambient = .2*fade,
opacity = 1.0*fade, diffuse = .8*fade)
for q in p.vertices():
t.sphere(q,.05,'mattered')
for q in p.vertex_adjacencies():
q1 = q[0]
for q2 in q[1]:
t.fcylinder(p.vertices()[q1], p.vertices()[q2], .01,
'matteblue')
return t
def makeblackframe(fname, xres = 500, yres = 500):
t = Tachyon(xres = xres, yres = yres)
t.save(fname)
pico = polytopes.icosahedron()
prelabel = 'demo'
npi = RDF(pi)
frames = 120
for i in srange(0,frames):
if mod(i,20)==0: print i
fname = prelabel + '0'*(3-len(str(i)))+str(i)
tachbs(pico,th = 2.0*npi*i/(frames-1.0), antialiasing=True,
raydepth = 6).save(DATA+fname+'.png')
makeblackframe(DATA+ prelabel + '0'*(3-len(str(i+1)))+str(i+1)
+'.png')
os.system('ffmpeg -qmax 2 -r 20 -i ' + DATA + prelabel + '%3d.png ./'
+ prelabel +'.mp4')
-Marshall
On Mar 3, 11:08 am, Christopher Olah <christopherolah...@gmail.com>
wrote:
Jason Grout
> Okay, this is somewhat baroque but might be helpful. One of the main
> things is the zero-padding of file names, e.g. in the line "fname =
> prelabel + '0'*(3-len(str(i)))+str(i)":
You could use the python formatting magic:
sage: "%03d"%1
'001'
sage: "%03d"%11
'011'
sage: "%03d"%199
'199'
sage: "%03d"%1999
'1999'
See http://docs.python.org/library/stdtypes.html#string-formatting for
more options.
Thanks,
Jason
Marshall Hampton
too lazy to look it up :)
Thanks,
Marshall
Robert Bradshaw
> BTW, tachyon is supposed to run over MPI. Can I use SAGE to run
> tachyon over a cluster?
Sage just calls the tachyon executable, so if you (re)compile tachyon
with MPI support it might just work. Of course if you're doing an
animation it's trivial to parallelize the individual frames (though
you might run out of memory before you run out of CPU in that case).
- Robert
Marshall Hampton
Cranking up the raydepth and size and complexity of objects could get
that up to 15-20 MB pretty easily. I've never done a really complex
scene, i.e. realistic stuff with thousands of objects. For my
polyhedral movies the bottleneck often is on the Sage end of things.
-Marshall
On Mar 4, 2:50 am, Robert Bradshaw <rober...@math.washington.edu>
wrote: