# ITER Fly-Through¶

This video of a MOAB-based ITER surface model was generate with the yt using the following notebook!

In [24]:
from IPython.display import YouTubeVideo

Out[24]:
In [1]:
import h5py
from yt.mods import *
import matplotlib.pyplot as plt
from matplotlib import collections
from yt.utilities.lib.geometry_utils import triangle_plane_intersect

In [2]:
def intersect_plane(ax, coord, tri):
# Tri is [ (p0, p1, p2), (p0, p1, p2), (p0, p1, p2) ]
p = []
for i0, i1 in [(0, 1), (1, 2), (2, 0)]:
p0 = tri[i0,:]
p1 = tri[i1,:]
vec = p1 - p0
t = (coord - p0[ax])/vec[ax]
# coord = t0[ax] + vec[ax]*t
if 0.0 <= t <= 1.0:
p.append(p0 + vec * t)
return p

In [3]:
#f = h5py.File("teapot.h5m", "r")
#f = h5py.File("iter_imprinted.h5m", "r")
f = h5py.File("bllite30matls_zip.h5m", "r")
coords = f["/tstt/nodes/coordinates"][:]
conn = f["/tstt/elements/Tri3/connectivity"][:]
points = coords[conn-1]

In [19]:
%%time
ax = 2
xax, yax = x_dict[ax], y_dict[ax]
mi = coords.min(axis=0)
ma = coords.max(axis=0)
cut_points = np.mgrid[coords[:,ax].min():coords[:,ax].max():1008j]
for i, coord in parallel_objects(enumerate(cut_points)):
plt.clf()
l_cy = triangle_plane_intersect(ax, coord, points)[:,:,(xax, yax)]
lc = collections.LineCollection(l_cy, colors='k')
plt.xlim(mi[xax], ma[xax])
plt.ylim(mi[yax], ma[yax])
plt.title("z = {0:.4} cm".format(coord))
plt.xlabel("x [cm]")
plt.ylabel("y [cm]")
plt.savefig("iter{0:03}.png".format(i))
print("generated {0:.4} {1}".format(coord, i))

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generated 733.5 938
generated 735.2 939
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generated 740.3 942
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generated 750.4 948
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generated 777.4 964
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generated 801.0 978
generated 802.7 979
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generated 836.5 999
generated 838.2 1000
generated 839.9 1001
generated 841.6 1002
generated 843.2 1003
generated 844.9 1004
generated 846.6 1005
generated 848.3 1006
generated 850.0 1007
CPU times: user 17min 57s, sys: 4.24 s, total: 18min 1s
Wall time: 18min 3s

In [23]:
!mencoder 'mf://iter*.png' -mf fps=24 -o iter-surfaces.mp4 -ovc lavc -lavcopts vcodec=mpeg4

MEncoder svn r34540 (Ubuntu), built with gcc-4.7 (C) 2000-2012 MPlayer Team

WARNING: OUTPUT FILE FORMAT IS _AVI_. See -of help.
success: format: 16  data: 0x0 - 0x0
MF file format detected.
[mf] search expr: iter*.png
[mf] number of files: 1008 (8064)
[demux_mf] file type was not set! trying 'type=png'...
VIDEO:  [MPNG]  0x0  24bpp  24.000 fps    0.0 kbps ( 0.0 kbyte/s)
[V] filefmt:16  fourcc:0x474E504D  size:0x0  fps:24.000  ftime:=0.0417
libavcodec version 53.35.0 (external)
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffpng] vfm: ffmpeg (FFmpeg PNG)
==========================================================================
Could not find matching colorspace - retrying with -vf scale...
Opening video filter: [scale]
Movie-Aspect is undefined - no prescaling applied.
[swscaler @ 0x7fe74c4e3640]BICUBIC scaler, from bgra to yuv420p using MMX2
videocodec: libavcodec (432x288 fourcc=34504d46 [FMP4])
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.

[VD_FFMPEG] DRI failure.

Flushing video frames.
Writing index...

!rm iter*.png