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"""isosurface.py -- plot isosurfaces
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Heavily based on iso.c in the GTS examples directory
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Copyright (C) 2009 Richard Everson
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Richard Everson <R.M.Everson@exeter.ac.uk>
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School of Engineering, Computing and Mathematics,
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the
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Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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from optparse import OptionParser
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from enthought.mayavi import mlab
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# Visualise a bug in GTS by running this with args --function=ellipsoid
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# -c80.0 --method=dual
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# In addition to the expected ellipsoid, there is an open surface in the
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# z=-10 plane which appears to be the "shadow" of the ellipsoid intersected
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# with the data grid. Running the GTS/examples/iso -d 50 50 50 80 yields
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# similar, confirming that this is a GTS bug.
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x, y, z = numpy.ogrid[-10:10:Nj, -10:10:Nj, -10:10:Nj]
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scalars = x*x + 2.0*y*y + z*z/2.0
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# The Clebsch diagonal surface: a smooth cubic surface admitting the
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# symmetry of the tetrahedron (courtesy Johannes Beigel via GTS).
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x, y, z = numpy.ogrid[-10:10:Nj, -10:10:Nj, -10:10:Nj]
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c2 = p*p*p + q*q*q + r*r*r - s*s*s
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functions = { "ellipsoid" : ellipsoid,
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parser = OptionParser()
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parser.add_option("-n", "--N", type="int",
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help="Size of data cube")
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parser.add_option("-c", "--isovalue", type="string",
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dest="c", default="80.0",
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help="""Comma separated list of values defining isosurfaces.
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Try: --isovalue=25.0,120.0 --function=ellipsoid
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parser.add_option("--function", type="string", dest="function",
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help="Function defining surface: ['ellipsoid'|'clebsch']")
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parser.add_option("--method", type="string",
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dest="method", default="cube",
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help="Iso-surface generation method: " \
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"['cube'|'tetra'|'dual'|'bounded']")
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(opt, args) = parser.parse_args()
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extents = numpy.asarray([-10.0, 10.0, -10.0, 10.0, -10.0, 10.0])
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func = functions[opt.function]
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for c in [string.atof(x) for x in opt.c.split(',')]:
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S.add(gts.isosurface(data, c, extents=extents, method=opt.method))
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print S.stats()['n_faces'], 'facets'
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x,y,z,t = gts.get_coords_and_face_indices(S,True)
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mlab.triangular_mesh(x,y,z,t,color=(0.25,0.25,0.75))
added
removed
.pc/fix_examples.patch/examples/isosurface.py
