Here is an example which might help. For it to work you need to
install ffmpeg. It generates a rotating icosahedron movie. For what
you want to do list_plot3d might be more appropriate:
{{{
c = polytopes.icosahedron()
label = 'Ico_movie'
# Numerical pi predefined for some speed
npi = RDF(pi)
#A rotation matrix
def rot(i,j,th):
q = matrix(RDF,3)
for k in range(3):
q[k,k] = 1.0
q[i,i] = cos(th)
q[j,j] = cos(th)
q[i,j] = sin(th)
q[j,i] = -sin(th)
return q
index = 0
for theta in srange(0,2*npi,npi/10):
vs = c.vertices()[:]
#rotate the vertices:
vs = [rot(0,1,theta)*vector(v) for v in vs]
edgedata = c.vertex_adjacencies()
facedata = c.triangulated_facial_incidences()
#Set up Tachyon.
#use small xres, yres for speed. antialiasing helps things look
better.
t = Tachyon(xres = 250, yres = 250, antialiasing = True)
t.texture('e1', color = (0,0,1))
t.texture('f1',opacity = .5, color = (1,0,0))
t.light((2,2,2), 0.1, (1,1,1))
#Draw edges:
edges = []
for anedge in edgedata:
v0 = anedge[0]
for v1 in anedge[1]:
if v1 > v0:
edges.append([vs[v0],vs[v1]])
for anedge in edges:
t.fcylinder(anedge[0],anedge[1],.01,'e1')
#Draw transparent faces:
for atri in facedata:
t.triangle(vs[atri[1][0]],vs[atri[1][1]],vs[atri[1][2]],'f1')
#Make file names in order for ffmpeg
str_index = '0'*(3-len(str(index)))+str(index)
t.save(DATA+label+ str_index + '.png')
index += 1
#Add a black final frame, since otherwise the compression in ffmpeg
gets confused.
t = Tachyon(xres = 250, yres = 250, antialiasing = True)
str_index = '0'*(3-len(str(index)))+str(index)
t.save(DATA+label+ str_index + '.png')
#Use ffmpeg to animate:
os.system('ffmpeg -qmax 2 -i ' + DATA + label + '%3d.png ./test.mp4')
}}}
On Dec 9, 5:02 am, ggrafendorfer <georg.grafendor...@gmail.com> wrote:
> Hi Marshall,
> thanks for the answer, if you once have the frames I also know these
> two projects, but I did not try them out yet:
>
> http://www.onyxbits.de/giftedmotion
>
> http://www.lcdf.org/~eddietwo/gifsicle/
>
> Is it possible to make the frames, i.e. .jpg or .png files with
> tachyon from within sage or python?
>
> Actually I was hoping for an easy "on the fly" solution, to keep all
> the data of all surfaces in one file and produce the moving surface
> directly from that file
>
> thanks,
> Georg
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