920fd9333e
- volumetric rendering - isosurfaces, mesh rendering - basic transformation and parent/child functionality
1169 lines
42 KiB
Python
1169 lines
42 KiB
Python
# -*- coding: utf-8 -*-
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"""
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functions.py - Miscellaneous functions with no other home
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Copyright 2010 Luke Campagnola
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Distributed under MIT/X11 license. See license.txt for more infomation.
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"""
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Colors = {
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'b': (0,0,255,255),
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'g': (0,255,0,255),
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'r': (255,0,0,255),
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'c': (0,255,255,255),
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'm': (255,0,255,255),
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'y': (255,255,0,255),
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'k': (0,0,0,255),
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'w': (255,255,255,255),
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}
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SI_PREFIXES = u'yzafpnµm kMGTPEZY'
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SI_PREFIXES_ASCII = 'yzafpnum kMGTPEZY'
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USE_WEAVE = True
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from Qt import QtGui, QtCore
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import numpy as np
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import scipy.ndimage
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import decimal, re
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import scipy.weave
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import debug
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def siScale(x, minVal=1e-25, allowUnicode=True):
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"""
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Return the recommended scale factor and SI prefix string for x.
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Example::
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siScale(0.0001) # returns (1e6, 'μ')
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# This indicates that the number 0.0001 is best represented as 0.0001 * 1e6 = 100 μUnits
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"""
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if isinstance(x, decimal.Decimal):
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x = float(x)
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try:
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if np.isnan(x) or np.isinf(x):
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return(1, '')
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except:
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print x, type(x)
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raise
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if abs(x) < minVal:
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m = 0
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x = 0
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else:
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m = int(np.clip(np.floor(np.log(abs(x))/np.log(1000)), -9.0, 9.0))
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if m == 0:
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pref = ''
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elif m < -8 or m > 8:
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pref = 'e%d' % (m*3)
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else:
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if allowUnicode:
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pref = SI_PREFIXES[m+8]
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else:
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pref = SI_PREFIXES_ASCII[m+8]
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p = .001**m
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return (p, pref)
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def siFormat(x, precision=3, suffix='', space=True, error=None, minVal=1e-25, allowUnicode=True):
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"""
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Return the number x formatted in engineering notation with SI prefix.
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Example::
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siFormat(0.0001, suffix='V') # returns "100 μV"
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"""
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if space is True:
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space = ' '
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if space is False:
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space = ''
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(p, pref) = siScale(x, minVal, allowUnicode)
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if not (len(pref) > 0 and pref[0] == 'e'):
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pref = space + pref
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if error is None:
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fmt = "%." + str(precision) + "g%s%s"
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return fmt % (x*p, pref, suffix)
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else:
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plusminus = space + u"±" + space
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fmt = "%." + str(precision) + u"g%s%s%s%s"
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return fmt % (x*p, pref, suffix, plusminus, siFormat(error, precision=precision, suffix=suffix, space=space, minVal=minVal))
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def siEval(s):
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"""
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Convert a value written in SI notation to its equivalent prefixless value
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Example::
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siEval("100 μV") # returns 0.0001
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"""
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s = unicode(s)
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m = re.match(r'(-?((\d+(\.\d*)?)|(\.\d+))([eE]-?\d+)?)\s*([u' + SI_PREFIXES + r']?)$', s)
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if m is None:
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raise Exception("Can't convert string '%s' to number." % s)
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v = float(m.groups()[0])
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p = m.groups()[6]
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#if p not in SI_PREFIXES:
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#raise Exception("Can't convert string '%s' to number--unknown prefix." % s)
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if p == '':
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n = 0
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elif p == 'u':
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n = -2
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else:
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n = SI_PREFIXES.index(p) - 8
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return v * 1000**n
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class Color(QtGui.QColor):
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def __init__(self, *args):
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QtGui.QColor.__init__(self, mkColor(*args))
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def glColor(self):
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"""Return (r,g,b,a) normalized for use in opengl"""
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return (self.red()/255., self.green()/255., self.blue()/255., self.alpha()/255.)
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def __getitem__(self, ind):
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return (self.red, self.green, self.blue, self.alpha)[ind]()
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def mkColor(*args):
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"""
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Convenience function for constructing QColor from a variety of argument types. Accepted arguments are:
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================ ================================================
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'c' one of: r, g, b, c, m, y, k, w
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R, G, B, [A] integers 0-255
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(R, G, B, [A]) tuple of integers 0-255
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float greyscale, 0.0-1.0
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int see :func:`intColor() <pyqtgraph.intColor>`
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(int, hues) see :func:`intColor() <pyqtgraph.intColor>`
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"RGB" hexadecimal strings; may begin with '#'
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"RGBA"
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"RRGGBB"
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"RRGGBBAA"
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QColor QColor instance; makes a copy.
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================ ================================================
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"""
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err = 'Not sure how to make a color from "%s"' % str(args)
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if len(args) == 1:
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if isinstance(args[0], QtGui.QColor):
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return QtGui.QColor(args[0])
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elif isinstance(args[0], float):
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r = g = b = int(args[0] * 255)
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a = 255
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elif isinstance(args[0], basestring):
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c = args[0]
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if c[0] == '#':
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c = c[1:]
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if len(c) == 1:
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(r, g, b, a) = Colors[c]
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if len(c) == 3:
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r = int(c[0]*2, 16)
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g = int(c[1]*2, 16)
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b = int(c[2]*2, 16)
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a = 255
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elif len(c) == 4:
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r = int(c[0]*2, 16)
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g = int(c[1]*2, 16)
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b = int(c[2]*2, 16)
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a = int(c[3]*2, 16)
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elif len(c) == 6:
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r = int(c[0:2], 16)
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g = int(c[2:4], 16)
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b = int(c[4:6], 16)
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a = 255
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elif len(c) == 8:
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r = int(c[0:2], 16)
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g = int(c[2:4], 16)
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b = int(c[4:6], 16)
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a = int(c[6:8], 16)
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elif hasattr(args[0], '__len__'):
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if len(args[0]) == 3:
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(r, g, b) = args[0]
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a = 255
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elif len(args[0]) == 4:
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(r, g, b, a) = args[0]
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elif len(args[0]) == 2:
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return intColor(*args[0])
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else:
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raise Exception(err)
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elif type(args[0]) == int:
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return intColor(args[0])
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else:
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raise Exception(err)
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elif len(args) == 3:
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(r, g, b) = args
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a = 255
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elif len(args) == 4:
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(r, g, b, a) = args
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else:
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raise Exception(err)
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args = [r,g,b,a]
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args = map(lambda a: 0 if np.isnan(a) or np.isinf(a) else a, args)
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args = map(int, args)
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return QtGui.QColor(*args)
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def mkBrush(*args):
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"""
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| Convenience function for constructing Brush.
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| This function always constructs a solid brush and accepts the same arguments as :func:`mkColor() <pyqtgraph.mkColor>`
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| Calling mkBrush(None) returns an invisible brush.
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"""
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if len(args) == 1:
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arg = args[0]
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if arg is None:
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return QtGui.QBrush(QtCore.Qt.NoBrush)
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elif isinstance(arg, QtGui.QBrush):
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return QtGui.QBrush(arg)
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else:
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color = arg
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if len(args) > 1:
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color = args
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return QtGui.QBrush(mkColor(color))
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def mkPen(*args, **kargs):
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"""
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Convenience function for constructing QPen.
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Examples::
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mkPen(color)
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mkPen(color, width=2)
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mkPen(cosmetic=False, width=4.5, color='r')
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mkPen({'color': "FF0", width: 2})
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mkPen(None) # (no pen)
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In these examples, *color* may be replaced with any arguments accepted by :func:`mkColor() <pyqtgraph.mkColor>` """
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color = kargs.get('color', None)
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width = kargs.get('width', 1)
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style = kargs.get('style', None)
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cosmetic = kargs.get('cosmetic', True)
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hsv = kargs.get('hsv', None)
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if len(args) == 1:
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arg = args[0]
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if isinstance(arg, dict):
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return mkPen(**arg)
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if isinstance(arg, QtGui.QPen):
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return arg
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elif arg is None:
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style = QtCore.Qt.NoPen
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else:
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color = arg
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if len(args) > 1:
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color = args
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if color is None:
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color = mkColor(200, 200, 200)
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if hsv is not None:
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color = hsvColor(*hsv)
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else:
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color = mkColor(color)
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pen = QtGui.QPen(QtGui.QBrush(color), width)
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pen.setCosmetic(cosmetic)
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if style is not None:
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pen.setStyle(style)
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return pen
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def hsvColor(h, s=1.0, v=1.0, a=1.0):
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"""Generate a QColor from HSVa values."""
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c = QtGui.QColor()
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c.setHsvF(h, s, v, a)
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return c
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def colorTuple(c):
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"""Return a tuple (R,G,B,A) from a QColor"""
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return (c.red(), c.green(), c.blue(), c.alpha())
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def colorStr(c):
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"""Generate a hex string code from a QColor"""
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return ('%02x'*4) % colorTuple(c)
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def intColor(index, hues=9, values=1, maxValue=255, minValue=150, maxHue=360, minHue=0, sat=255, alpha=255, **kargs):
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"""
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Creates a QColor from a single index. Useful for stepping through a predefined list of colors.
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The argument *index* determines which color from the set will be returned. All other arguments determine what the set of predefined colors will be
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Colors are chosen by cycling across hues while varying the value (brightness).
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By default, this selects from a list of 9 hues."""
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hues = int(hues)
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values = int(values)
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ind = int(index) % (hues * values)
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indh = ind % hues
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indv = ind / hues
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if values > 1:
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v = minValue + indv * ((maxValue-minValue) / (values-1))
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else:
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v = maxValue
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h = minHue + (indh * (maxHue-minHue)) / hues
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c = QtGui.QColor()
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c.setHsv(h, sat, v)
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c.setAlpha(alpha)
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return c
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def affineSlice(data, shape, origin, vectors, axes, **kargs):
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"""
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Take a slice of any orientation through an array. This is useful for extracting sections of multi-dimensional arrays such as MRI images for viewing as 1D or 2D data.
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The slicing axes are aribtrary; they do not need to be orthogonal to the original data or even to each other. It is possible to use this function to extract arbitrary linear, rectangular, or parallelepiped shapes from within larger datasets.
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For a graphical interface to this function, see :func:`ROI.getArrayRegion`
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Arguments:
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| *data* (ndarray): the original dataset
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| *shape*: the shape of the slice to take (Note the return value may have more dimensions than len(shape))
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| *origin*: the location in the original dataset that will become the origin in the sliced data.
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| *vectors*: list of unit vectors which point in the direction of the slice axes
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* each vector must have the same length as *axes*
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* If the vectors are not unit length, the result will be scaled.
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* If the vectors are not orthogonal, the result will be sheared.
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*axes*: the axes in the original dataset which correspond to the slice *vectors*
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Example: start with a 4D fMRI data set, take a diagonal-planar slice out of the last 3 axes
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* data = array with dims (time, x, y, z) = (100, 40, 40, 40)
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* The plane to pull out is perpendicular to the vector (x,y,z) = (1,1,1)
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* The origin of the slice will be at (x,y,z) = (40, 0, 0)
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* We will slice a 20x20 plane from each timepoint, giving a final shape (100, 20, 20)
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The call for this example would look like::
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affineSlice(data, shape=(20,20), origin=(40,0,0), vectors=((-1, 1, 0), (-1, 0, 1)), axes=(1,2,3))
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Note the following must be true:
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| len(shape) == len(vectors)
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| len(origin) == len(axes) == len(vectors[0])
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"""
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# sanity check
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if len(shape) != len(vectors):
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raise Exception("shape and vectors must have same length.")
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if len(origin) != len(axes):
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raise Exception("origin and axes must have same length.")
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for v in vectors:
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if len(v) != len(axes):
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raise Exception("each vector must be same length as axes.")
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shape = map(np.ceil, shape)
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## transpose data so slice axes come first
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trAx = range(data.ndim)
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for x in axes:
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trAx.remove(x)
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tr1 = tuple(axes) + tuple(trAx)
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data = data.transpose(tr1)
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#print "tr1:", tr1
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## dims are now [(slice axes), (other axes)]
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## make sure vectors are arrays
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vectors = np.array(vectors)
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origin = np.array(origin)
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origin.shape = (len(axes),) + (1,)*len(shape)
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## Build array of sample locations.
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grid = np.mgrid[tuple([slice(0,x) for x in shape])] ## mesh grid of indexes
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#print shape, grid.shape
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x = (grid[np.newaxis,...] * vectors.transpose()[(Ellipsis,) + (np.newaxis,)*len(shape)]).sum(axis=1) ## magic
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x += origin
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#print "X values:"
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#print x
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## iterate manually over unused axes since map_coordinates won't do it for us
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extraShape = data.shape[len(axes):]
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output = np.empty(tuple(shape) + extraShape, dtype=data.dtype)
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for inds in np.ndindex(*extraShape):
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ind = (Ellipsis,) + inds
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#print data[ind].shape, x.shape, output[ind].shape, output.shape
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output[ind] = scipy.ndimage.map_coordinates(data[ind], x, **kargs)
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tr = range(output.ndim)
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trb = []
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for i in range(min(axes)):
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ind = tr1.index(i) + (len(shape)-len(axes))
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tr.remove(ind)
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trb.append(ind)
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tr2 = tuple(trb+tr)
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## Untranspose array before returning
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return output.transpose(tr2)
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def makeARGB(data, lut=None, levels=None):
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"""
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Convert a 2D or 3D array into an ARGB array suitable for building QImages
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Will optionally do scaling and/or table lookups to determine final colors.
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Returns the ARGB array and a boolean indicating whether there is alpha channel data.
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Arguments:
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data - 2D or 3D numpy array of int/float types
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For 2D arrays (x, y):
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* The color will be determined using a lookup table (see argument 'lut').
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* If levels are given, the data is rescaled and converted to int
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before using the lookup table.
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For 3D arrays (x, y, rgba):
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* The third axis must have length 3 or 4 and will be interpreted as RGBA.
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* The 'lut' argument is not allowed.
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lut - Lookup table for 2D data. May be 1D or 2D (N,rgba) and must have dtype=ubyte.
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Values in data will be converted to color by indexing directly from lut.
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Lookup tables can be built using GradientWidget.
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levels - List [min, max]; optionally rescale data before converting through the
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lookup table. rescaled = (data-min) * len(lut) / (max-min)
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"""
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prof = debug.Profiler('functions.makeARGB', disabled=True)
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## sanity checks
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if data.ndim == 3:
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if data.shape[2] not in (3,4):
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raise Exception("data.shape[2] must be 3 or 4")
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#if lut is not None:
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#raise Exception("can not use lookup table with 3D data")
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elif data.ndim != 2:
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raise Exception("data must be 2D or 3D")
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if lut is not None:
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if lut.ndim == 2:
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if lut.shape[1] not in (3,4):
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raise Exception("lut.shape[1] must be 3 or 4")
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elif lut.ndim != 1:
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raise Exception("lut must be 1D or 2D")
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if lut.dtype != np.ubyte:
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raise Exception('lookup table must have dtype=ubyte (got %s instead)' % str(lut.dtype))
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if levels is not None:
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levels = np.array(levels)
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if levels.shape == (2,):
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pass
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elif levels.shape in [(3,2), (4,2)]:
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if data.ndim == 3:
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raise Exception("Can not use 2D levels with 3D data.")
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if lut is not None:
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raise Exception('Can not use 2D levels and lookup table together.')
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else:
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raise Exception("Levels must have shape (2,) or (3,2) or (4,2)")
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prof.mark('1')
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if lut is not None:
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lutLength = lut.shape[0]
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else:
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lutLength = 256
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## weave requires contiguous arrays
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global USE_WEAVE
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if (levels is not None or lut is not None) and USE_WEAVE:
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data = np.ascontiguousarray(data)
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## Apply levels if given
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if levels is not None:
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try: ## use weave to speed up scaling
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if not USE_WEAVE:
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raise Exception('Weave is disabled; falling back to slower version.')
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if levels.ndim == 1:
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scale = float(lutLength) / (levels[1]-levels[0])
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offset = float(levels[0])
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data = rescaleData(data, scale, offset)
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else:
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if data.ndim == 2:
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newData = np.empty(data.shape+(levels.shape[0],), dtype=np.uint32)
|
|
for i in xrange(levels.shape[0]):
|
|
scale = float(lutLength / (levels[i,1]-levels[i,0]))
|
|
offset = float(levels[i,0])
|
|
newData[...,i] = rescaleData(data, scale, offset)
|
|
elif data.ndim == 3:
|
|
newData = np.empty(data.shape, dtype=np.uint32)
|
|
for i in xrange(data.shape[2]):
|
|
scale = float(lutLength / (levels[i,1]-levels[i,0]))
|
|
offset = float(levels[i,0])
|
|
#print scale, offset, data.shape, newData.shape, levels.shape
|
|
newData[...,i] = rescaleData(data[...,i], scale, offset)
|
|
data = newData
|
|
except:
|
|
if USE_WEAVE:
|
|
debug.printExc("Error; disabling weave.")
|
|
USE_WEAVE = False
|
|
|
|
if levels.ndim == 1:
|
|
if data.ndim == 2:
|
|
levels = levels[np.newaxis, np.newaxis, :]
|
|
else:
|
|
levels = levels[np.newaxis, np.newaxis, np.newaxis, :]
|
|
else:
|
|
levels = levels[np.newaxis, np.newaxis, ...]
|
|
if data.ndim == 2:
|
|
data = data[..., np.newaxis]
|
|
data = ((data-levels[...,0]) * lutLength) / (levels[...,1]-levels[...,0])
|
|
|
|
prof.mark('2')
|
|
|
|
|
|
## apply LUT if given
|
|
if lut is not None and data.ndim == 2:
|
|
|
|
if data.dtype.kind not in ('i', 'u'):
|
|
data = data.astype(int)
|
|
|
|
data = np.clip(data, 0, lutLength-1)
|
|
try:
|
|
if not USE_WEAVE:
|
|
raise Exception('Weave is disabled; falling back to slower version.')
|
|
|
|
newData = np.empty((data.size,) + lut.shape[1:], dtype=np.uint8)
|
|
flat = data.reshape(data.size)
|
|
size = data.size
|
|
ncol = lut.shape[1]
|
|
newStride = newData.strides[0]
|
|
newColStride = newData.strides[1]
|
|
lutStride = lut.strides[0]
|
|
lutColStride = lut.strides[1]
|
|
flatStride = flat.strides[0] / flat.dtype.itemsize
|
|
|
|
#print "newData:", newData.shape, newData.dtype
|
|
#print "flat:", flat.shape, flat.dtype, flat.min(), flat.max()
|
|
#print "lut:", lut.shape, lut.dtype
|
|
#print "size:", size, "ncols:", ncol
|
|
#print "strides:", newStride, newColStride, lutStride, lutColStride, flatStride
|
|
|
|
code = """
|
|
|
|
for( int i=0; i<size; i++ ) {
|
|
for( int j=0; j<ncol; j++ ) {
|
|
newData[i*newStride + j*newColStride] = lut[flat[i*flatStride]*lutStride + j*lutColStride];
|
|
}
|
|
}
|
|
"""
|
|
scipy.weave.inline(code, ['flat', 'lut', 'newData', 'size', 'ncol', 'newStride', 'lutStride', 'flatStride', 'newColStride', 'lutColStride'])
|
|
data = newData.reshape(data.shape + lut.shape[1:])
|
|
except:
|
|
if USE_WEAVE:
|
|
debug.printExc("Error; disabling weave.")
|
|
USE_WEAVE = False
|
|
data = lut[data]
|
|
else:
|
|
if data.dtype is not np.ubyte:
|
|
data = np.clip(data, 0, 255).astype(np.ubyte)
|
|
|
|
prof.mark('3')
|
|
|
|
|
|
## copy data into ARGB ordered array
|
|
imgData = np.empty(data.shape[:2]+(4,), dtype=np.ubyte)
|
|
if data.ndim == 2:
|
|
data = data[..., np.newaxis]
|
|
|
|
prof.mark('4')
|
|
|
|
|
|
order = [2,1,0,3] ## for some reason, the colors line up as BGR in the final image.
|
|
if data.shape[2] == 1:
|
|
for i in xrange(3):
|
|
imgData[..., order[i]] = data[..., 0]
|
|
else:
|
|
for i in xrange(0, data.shape[2]):
|
|
imgData[..., order[i]] = data[..., i]
|
|
|
|
prof.mark('5')
|
|
|
|
if data.shape[2] == 4:
|
|
alpha = True
|
|
else:
|
|
alpha = False
|
|
imgData[..., 3] = 255
|
|
|
|
prof.mark('6')
|
|
|
|
prof.finish()
|
|
return imgData, alpha
|
|
|
|
|
|
def makeQImage(imgData, alpha):
|
|
"""Turn an ARGB array into QImage"""
|
|
## create QImage from buffer
|
|
prof = debug.Profiler('functions.makeQImage', disabled=True)
|
|
|
|
if alpha:
|
|
imgFormat = QtGui.QImage.Format_ARGB32
|
|
else:
|
|
imgFormat = QtGui.QImage.Format_RGB32
|
|
|
|
imgData = imgData.transpose((1, 0, 2)) ## QImage expects the row/column order to be opposite
|
|
try:
|
|
buf = imgData.data
|
|
except AttributeError:
|
|
imgData = np.ascontiguousarray(imgData)
|
|
buf = imgData.data
|
|
|
|
prof.mark('1')
|
|
qimage = QtGui.QImage(buf, imgData.shape[1], imgData.shape[0], imgFormat)
|
|
prof.mark('2')
|
|
qimage.data = imgData
|
|
prof.finish()
|
|
return qimage
|
|
|
|
|
|
def rescaleData(data, scale, offset):
|
|
newData = np.empty((data.size,), dtype=np.int)
|
|
flat = data.reshape(data.size)
|
|
size = data.size
|
|
|
|
code = """
|
|
double sc = (double)scale;
|
|
double off = (double)offset;
|
|
for( int i=0; i<size; i++ ) {
|
|
newData[i] = (int)(((double)flat[i] - off) * sc);
|
|
}
|
|
"""
|
|
scipy.weave.inline(code, ['flat', 'newData', 'size', 'offset', 'scale'], compiler='gcc')
|
|
data = newData.reshape(data.shape)
|
|
return data
|
|
|
|
|
|
#def isosurface(data, level):
|
|
#"""
|
|
#Generate isosurface from volumetric data using marching tetrahedra algorithm.
|
|
#See Paul Bourke, "Polygonising a Scalar Field Using Tetrahedrons" (http://local.wasp.uwa.edu.au/~pbourke/geometry/polygonise/)
|
|
|
|
#*data* 3D numpy array of scalar values
|
|
#*level* The level at which to generate an isosurface
|
|
#"""
|
|
|
|
#facets = []
|
|
|
|
### mark everything below the isosurface level
|
|
#mask = data < level
|
|
|
|
#### make eight sub-fields
|
|
#fields = np.empty((2,2,2), dtype=object)
|
|
#slices = [slice(0,-1), slice(1,None)]
|
|
#for i in [0,1]:
|
|
#for j in [0,1]:
|
|
#for k in [0,1]:
|
|
#fields[i,j,k] = mask[slices[i], slices[j], slices[k]]
|
|
|
|
|
|
|
|
### split each cell into 6 tetrahedra
|
|
### these all have the same 'orienation'; points 1,2,3 circle
|
|
### clockwise around point 0
|
|
#tetrahedra = [
|
|
#[(0,1,0), (1,1,1), (0,1,1), (1,0,1)],
|
|
#[(0,1,0), (0,1,1), (0,0,1), (1,0,1)],
|
|
#[(0,1,0), (0,0,1), (0,0,0), (1,0,1)],
|
|
#[(0,1,0), (0,0,0), (1,0,0), (1,0,1)],
|
|
#[(0,1,0), (1,0,0), (1,1,0), (1,0,1)],
|
|
#[(0,1,0), (1,1,0), (1,1,1), (1,0,1)]
|
|
#]
|
|
|
|
### each tetrahedron will be assigned an index
|
|
### which determines how to generate its facets.
|
|
### this structure is:
|
|
### facets[index][facet1, facet2, ...]
|
|
### where each facet is triangular and its points are each
|
|
### interpolated between two points on the tetrahedron
|
|
### facet = [(p1a, p1b), (p2a, p2b), (p3a, p3b)]
|
|
### facet points always circle clockwise if you are looking
|
|
### at them from below the isosurface.
|
|
#indexFacets = [
|
|
#[], ## all above
|
|
#[[(0,1), (0,2), (0,3)]], # 0 below
|
|
#[[(1,0), (1,3), (1,2)]], # 1 below
|
|
#[[(0,2), (1,3), (1,2)], [(0,2), (0,3), (1,3)]], # 0,1 below
|
|
#[[(2,0), (2,1), (2,3)]], # 2 below
|
|
#[[(0,3), (1,2), (2,3)], [(0,3), (0,1), (1,2)]], # 0,2 below
|
|
#[[(1,0), (2,3), (2,0)], [(1,0), (1,3), (2,3)]], # 1,2 below
|
|
#[[(3,0), (3,1), (3,2)]], # 3 above
|
|
#[[(3,0), (3,2), (3,1)]], # 3 below
|
|
#[[(1,0), (2,0), (2,3)], [(1,0), (2,3), (1,3)]], # 0,3 below
|
|
#[[(0,3), (2,3), (1,2)], [(0,3), (1,2), (0,1)]], # 1,3 below
|
|
#[[(2,0), (2,3), (2,1)]], # 0,1,3 below
|
|
#[[(0,2), (1,2), (1,3)], [(0,2), (1,3), (0,3)]], # 2,3 below
|
|
#[[(1,0), (1,2), (1,3)]], # 0,2,3 below
|
|
#[[(0,1), (0,3), (0,2)]], # 1,2,3 below
|
|
#[] ## all below
|
|
#]
|
|
|
|
#for tet in tetrahedra:
|
|
|
|
### get the 4 fields for this tetrahedron
|
|
#tetFields = [fields[c] for c in tet]
|
|
|
|
### generate an index for each grid cell
|
|
#index = tetFields[0] + tetFields[1]*2 + tetFields[2]*4 + tetFields[3]*8
|
|
|
|
### add facets
|
|
#for i in xrange(index.shape[0]): # data x-axis
|
|
#for j in xrange(index.shape[1]): # data y-axis
|
|
#for k in xrange(index.shape[2]): # data z-axis
|
|
#for f in indexFacets[index[i,j,k]]: # faces to generate for this tet
|
|
#pts = []
|
|
#for l in [0,1,2]: # points in this face
|
|
#p1 = tet[f[l][0]] # tet corner 1
|
|
#p2 = tet[f[l][1]] # tet corner 2
|
|
#pts.append([(p1[x]+p2[x])*0.5+[i,j,k][x]+0.5 for x in [0,1,2]]) ## interpolate between tet corners
|
|
#facets.append(pts)
|
|
|
|
#return facets
|
|
|
|
|
|
|
|
|
|
def isosurface(data, level):
|
|
"""
|
|
Generate isosurface from volumetric data using marching tetrahedra algorithm.
|
|
See Paul Bourke, "Polygonising a Scalar Field"
|
|
(http://local.wasp.uwa.edu.au/~pbourke/geometry/polygonise/)
|
|
|
|
*data* 3D numpy array of scalar values
|
|
*level* The level at which to generate an isosurface
|
|
|
|
This function is SLOW; plenty of room for optimization here.
|
|
"""
|
|
|
|
## map from grid cell index to edge index.
|
|
## grid cell index tells us which corners are below the isosurface,
|
|
## edge index tells us which edges are cut by the isosurface.
|
|
## (Data stolen from Bourk; see above.)
|
|
edgeTable = [
|
|
0x0 , 0x109, 0x203, 0x30a, 0x406, 0x50f, 0x605, 0x70c,
|
|
0x80c, 0x905, 0xa0f, 0xb06, 0xc0a, 0xd03, 0xe09, 0xf00,
|
|
0x190, 0x99 , 0x393, 0x29a, 0x596, 0x49f, 0x795, 0x69c,
|
|
0x99c, 0x895, 0xb9f, 0xa96, 0xd9a, 0xc93, 0xf99, 0xe90,
|
|
0x230, 0x339, 0x33 , 0x13a, 0x636, 0x73f, 0x435, 0x53c,
|
|
0xa3c, 0xb35, 0x83f, 0x936, 0xe3a, 0xf33, 0xc39, 0xd30,
|
|
0x3a0, 0x2a9, 0x1a3, 0xaa , 0x7a6, 0x6af, 0x5a5, 0x4ac,
|
|
0xbac, 0xaa5, 0x9af, 0x8a6, 0xfaa, 0xea3, 0xda9, 0xca0,
|
|
0x460, 0x569, 0x663, 0x76a, 0x66 , 0x16f, 0x265, 0x36c,
|
|
0xc6c, 0xd65, 0xe6f, 0xf66, 0x86a, 0x963, 0xa69, 0xb60,
|
|
0x5f0, 0x4f9, 0x7f3, 0x6fa, 0x1f6, 0xff , 0x3f5, 0x2fc,
|
|
0xdfc, 0xcf5, 0xfff, 0xef6, 0x9fa, 0x8f3, 0xbf9, 0xaf0,
|
|
0x650, 0x759, 0x453, 0x55a, 0x256, 0x35f, 0x55 , 0x15c,
|
|
0xe5c, 0xf55, 0xc5f, 0xd56, 0xa5a, 0xb53, 0x859, 0x950,
|
|
0x7c0, 0x6c9, 0x5c3, 0x4ca, 0x3c6, 0x2cf, 0x1c5, 0xcc ,
|
|
0xfcc, 0xec5, 0xdcf, 0xcc6, 0xbca, 0xac3, 0x9c9, 0x8c0,
|
|
0x8c0, 0x9c9, 0xac3, 0xbca, 0xcc6, 0xdcf, 0xec5, 0xfcc,
|
|
0xcc , 0x1c5, 0x2cf, 0x3c6, 0x4ca, 0x5c3, 0x6c9, 0x7c0,
|
|
0x950, 0x859, 0xb53, 0xa5a, 0xd56, 0xc5f, 0xf55, 0xe5c,
|
|
0x15c, 0x55 , 0x35f, 0x256, 0x55a, 0x453, 0x759, 0x650,
|
|
0xaf0, 0xbf9, 0x8f3, 0x9fa, 0xef6, 0xfff, 0xcf5, 0xdfc,
|
|
0x2fc, 0x3f5, 0xff , 0x1f6, 0x6fa, 0x7f3, 0x4f9, 0x5f0,
|
|
0xb60, 0xa69, 0x963, 0x86a, 0xf66, 0xe6f, 0xd65, 0xc6c,
|
|
0x36c, 0x265, 0x16f, 0x66 , 0x76a, 0x663, 0x569, 0x460,
|
|
0xca0, 0xda9, 0xea3, 0xfaa, 0x8a6, 0x9af, 0xaa5, 0xbac,
|
|
0x4ac, 0x5a5, 0x6af, 0x7a6, 0xaa , 0x1a3, 0x2a9, 0x3a0,
|
|
0xd30, 0xc39, 0xf33, 0xe3a, 0x936, 0x83f, 0xb35, 0xa3c,
|
|
0x53c, 0x435, 0x73f, 0x636, 0x13a, 0x33 , 0x339, 0x230,
|
|
0xe90, 0xf99, 0xc93, 0xd9a, 0xa96, 0xb9f, 0x895, 0x99c,
|
|
0x69c, 0x795, 0x49f, 0x596, 0x29a, 0x393, 0x99 , 0x190,
|
|
0xf00, 0xe09, 0xd03, 0xc0a, 0xb06, 0xa0f, 0x905, 0x80c,
|
|
0x70c, 0x605, 0x50f, 0x406, 0x30a, 0x203, 0x109, 0x0 ]
|
|
|
|
## Table of triangles to use for filling each grid cell.
|
|
## Each set of three integers tells us which three edges to
|
|
## draw a triangle between.
|
|
## (Data stolen from Bourk; see above.)
|
|
triTable = [
|
|
[],
|
|
[0, 8, 3],
|
|
[0, 1, 9],
|
|
[1, 8, 3, 9, 8, 1],
|
|
[1, 2, 10],
|
|
[0, 8, 3, 1, 2, 10],
|
|
[9, 2, 10, 0, 2, 9],
|
|
[2, 8, 3, 2, 10, 8, 10, 9, 8],
|
|
[3, 11, 2],
|
|
[0, 11, 2, 8, 11, 0],
|
|
[1, 9, 0, 2, 3, 11],
|
|
[1, 11, 2, 1, 9, 11, 9, 8, 11],
|
|
[3, 10, 1, 11, 10, 3],
|
|
[0, 10, 1, 0, 8, 10, 8, 11, 10],
|
|
[3, 9, 0, 3, 11, 9, 11, 10, 9],
|
|
[9, 8, 10, 10, 8, 11],
|
|
[4, 7, 8],
|
|
[4, 3, 0, 7, 3, 4],
|
|
[0, 1, 9, 8, 4, 7],
|
|
[4, 1, 9, 4, 7, 1, 7, 3, 1],
|
|
[1, 2, 10, 8, 4, 7],
|
|
[3, 4, 7, 3, 0, 4, 1, 2, 10],
|
|
[9, 2, 10, 9, 0, 2, 8, 4, 7],
|
|
[2, 10, 9, 2, 9, 7, 2, 7, 3, 7, 9, 4],
|
|
[8, 4, 7, 3, 11, 2],
|
|
[11, 4, 7, 11, 2, 4, 2, 0, 4],
|
|
[9, 0, 1, 8, 4, 7, 2, 3, 11],
|
|
[4, 7, 11, 9, 4, 11, 9, 11, 2, 9, 2, 1],
|
|
[3, 10, 1, 3, 11, 10, 7, 8, 4],
|
|
[1, 11, 10, 1, 4, 11, 1, 0, 4, 7, 11, 4],
|
|
[4, 7, 8, 9, 0, 11, 9, 11, 10, 11, 0, 3],
|
|
[4, 7, 11, 4, 11, 9, 9, 11, 10],
|
|
[9, 5, 4],
|
|
[9, 5, 4, 0, 8, 3],
|
|
[0, 5, 4, 1, 5, 0],
|
|
[8, 5, 4, 8, 3, 5, 3, 1, 5],
|
|
[1, 2, 10, 9, 5, 4],
|
|
[3, 0, 8, 1, 2, 10, 4, 9, 5],
|
|
[5, 2, 10, 5, 4, 2, 4, 0, 2],
|
|
[2, 10, 5, 3, 2, 5, 3, 5, 4, 3, 4, 8],
|
|
[9, 5, 4, 2, 3, 11],
|
|
[0, 11, 2, 0, 8, 11, 4, 9, 5],
|
|
[0, 5, 4, 0, 1, 5, 2, 3, 11],
|
|
[2, 1, 5, 2, 5, 8, 2, 8, 11, 4, 8, 5],
|
|
[10, 3, 11, 10, 1, 3, 9, 5, 4],
|
|
[4, 9, 5, 0, 8, 1, 8, 10, 1, 8, 11, 10],
|
|
[5, 4, 0, 5, 0, 11, 5, 11, 10, 11, 0, 3],
|
|
[5, 4, 8, 5, 8, 10, 10, 8, 11],
|
|
[9, 7, 8, 5, 7, 9],
|
|
[9, 3, 0, 9, 5, 3, 5, 7, 3],
|
|
[0, 7, 8, 0, 1, 7, 1, 5, 7],
|
|
[1, 5, 3, 3, 5, 7],
|
|
[9, 7, 8, 9, 5, 7, 10, 1, 2],
|
|
[10, 1, 2, 9, 5, 0, 5, 3, 0, 5, 7, 3],
|
|
[8, 0, 2, 8, 2, 5, 8, 5, 7, 10, 5, 2],
|
|
[2, 10, 5, 2, 5, 3, 3, 5, 7],
|
|
[7, 9, 5, 7, 8, 9, 3, 11, 2],
|
|
[9, 5, 7, 9, 7, 2, 9, 2, 0, 2, 7, 11],
|
|
[2, 3, 11, 0, 1, 8, 1, 7, 8, 1, 5, 7],
|
|
[11, 2, 1, 11, 1, 7, 7, 1, 5],
|
|
[9, 5, 8, 8, 5, 7, 10, 1, 3, 10, 3, 11],
|
|
[5, 7, 0, 5, 0, 9, 7, 11, 0, 1, 0, 10, 11, 10, 0],
|
|
[11, 10, 0, 11, 0, 3, 10, 5, 0, 8, 0, 7, 5, 7, 0],
|
|
[11, 10, 5, 7, 11, 5],
|
|
[10, 6, 5],
|
|
[0, 8, 3, 5, 10, 6],
|
|
[9, 0, 1, 5, 10, 6],
|
|
[1, 8, 3, 1, 9, 8, 5, 10, 6],
|
|
[1, 6, 5, 2, 6, 1],
|
|
[1, 6, 5, 1, 2, 6, 3, 0, 8],
|
|
[9, 6, 5, 9, 0, 6, 0, 2, 6],
|
|
[5, 9, 8, 5, 8, 2, 5, 2, 6, 3, 2, 8],
|
|
[2, 3, 11, 10, 6, 5],
|
|
[11, 0, 8, 11, 2, 0, 10, 6, 5],
|
|
[0, 1, 9, 2, 3, 11, 5, 10, 6],
|
|
[5, 10, 6, 1, 9, 2, 9, 11, 2, 9, 8, 11],
|
|
[6, 3, 11, 6, 5, 3, 5, 1, 3],
|
|
[0, 8, 11, 0, 11, 5, 0, 5, 1, 5, 11, 6],
|
|
[3, 11, 6, 0, 3, 6, 0, 6, 5, 0, 5, 9],
|
|
[6, 5, 9, 6, 9, 11, 11, 9, 8],
|
|
[5, 10, 6, 4, 7, 8],
|
|
[4, 3, 0, 4, 7, 3, 6, 5, 10],
|
|
[1, 9, 0, 5, 10, 6, 8, 4, 7],
|
|
[10, 6, 5, 1, 9, 7, 1, 7, 3, 7, 9, 4],
|
|
[6, 1, 2, 6, 5, 1, 4, 7, 8],
|
|
[1, 2, 5, 5, 2, 6, 3, 0, 4, 3, 4, 7],
|
|
[8, 4, 7, 9, 0, 5, 0, 6, 5, 0, 2, 6],
|
|
[7, 3, 9, 7, 9, 4, 3, 2, 9, 5, 9, 6, 2, 6, 9],
|
|
[3, 11, 2, 7, 8, 4, 10, 6, 5],
|
|
[5, 10, 6, 4, 7, 2, 4, 2, 0, 2, 7, 11],
|
|
[0, 1, 9, 4, 7, 8, 2, 3, 11, 5, 10, 6],
|
|
[9, 2, 1, 9, 11, 2, 9, 4, 11, 7, 11, 4, 5, 10, 6],
|
|
[8, 4, 7, 3, 11, 5, 3, 5, 1, 5, 11, 6],
|
|
[5, 1, 11, 5, 11, 6, 1, 0, 11, 7, 11, 4, 0, 4, 11],
|
|
[0, 5, 9, 0, 6, 5, 0, 3, 6, 11, 6, 3, 8, 4, 7],
|
|
[6, 5, 9, 6, 9, 11, 4, 7, 9, 7, 11, 9],
|
|
[10, 4, 9, 6, 4, 10],
|
|
[4, 10, 6, 4, 9, 10, 0, 8, 3],
|
|
[10, 0, 1, 10, 6, 0, 6, 4, 0],
|
|
[8, 3, 1, 8, 1, 6, 8, 6, 4, 6, 1, 10],
|
|
[1, 4, 9, 1, 2, 4, 2, 6, 4],
|
|
[3, 0, 8, 1, 2, 9, 2, 4, 9, 2, 6, 4],
|
|
[0, 2, 4, 4, 2, 6],
|
|
[8, 3, 2, 8, 2, 4, 4, 2, 6],
|
|
[10, 4, 9, 10, 6, 4, 11, 2, 3],
|
|
[0, 8, 2, 2, 8, 11, 4, 9, 10, 4, 10, 6],
|
|
[3, 11, 2, 0, 1, 6, 0, 6, 4, 6, 1, 10],
|
|
[6, 4, 1, 6, 1, 10, 4, 8, 1, 2, 1, 11, 8, 11, 1],
|
|
[9, 6, 4, 9, 3, 6, 9, 1, 3, 11, 6, 3],
|
|
[8, 11, 1, 8, 1, 0, 11, 6, 1, 9, 1, 4, 6, 4, 1],
|
|
[3, 11, 6, 3, 6, 0, 0, 6, 4],
|
|
[6, 4, 8, 11, 6, 8],
|
|
[7, 10, 6, 7, 8, 10, 8, 9, 10],
|
|
[0, 7, 3, 0, 10, 7, 0, 9, 10, 6, 7, 10],
|
|
[10, 6, 7, 1, 10, 7, 1, 7, 8, 1, 8, 0],
|
|
[10, 6, 7, 10, 7, 1, 1, 7, 3],
|
|
[1, 2, 6, 1, 6, 8, 1, 8, 9, 8, 6, 7],
|
|
[2, 6, 9, 2, 9, 1, 6, 7, 9, 0, 9, 3, 7, 3, 9],
|
|
[7, 8, 0, 7, 0, 6, 6, 0, 2],
|
|
[7, 3, 2, 6, 7, 2],
|
|
[2, 3, 11, 10, 6, 8, 10, 8, 9, 8, 6, 7],
|
|
[2, 0, 7, 2, 7, 11, 0, 9, 7, 6, 7, 10, 9, 10, 7],
|
|
[1, 8, 0, 1, 7, 8, 1, 10, 7, 6, 7, 10, 2, 3, 11],
|
|
[11, 2, 1, 11, 1, 7, 10, 6, 1, 6, 7, 1],
|
|
[8, 9, 6, 8, 6, 7, 9, 1, 6, 11, 6, 3, 1, 3, 6],
|
|
[0, 9, 1, 11, 6, 7],
|
|
[7, 8, 0, 7, 0, 6, 3, 11, 0, 11, 6, 0],
|
|
[7, 11, 6],
|
|
[7, 6, 11],
|
|
[3, 0, 8, 11, 7, 6],
|
|
[0, 1, 9, 11, 7, 6],
|
|
[8, 1, 9, 8, 3, 1, 11, 7, 6],
|
|
[10, 1, 2, 6, 11, 7],
|
|
[1, 2, 10, 3, 0, 8, 6, 11, 7],
|
|
[2, 9, 0, 2, 10, 9, 6, 11, 7],
|
|
[6, 11, 7, 2, 10, 3, 10, 8, 3, 10, 9, 8],
|
|
[7, 2, 3, 6, 2, 7],
|
|
[7, 0, 8, 7, 6, 0, 6, 2, 0],
|
|
[2, 7, 6, 2, 3, 7, 0, 1, 9],
|
|
[1, 6, 2, 1, 8, 6, 1, 9, 8, 8, 7, 6],
|
|
[10, 7, 6, 10, 1, 7, 1, 3, 7],
|
|
[10, 7, 6, 1, 7, 10, 1, 8, 7, 1, 0, 8],
|
|
[0, 3, 7, 0, 7, 10, 0, 10, 9, 6, 10, 7],
|
|
[7, 6, 10, 7, 10, 8, 8, 10, 9],
|
|
[6, 8, 4, 11, 8, 6],
|
|
[3, 6, 11, 3, 0, 6, 0, 4, 6],
|
|
[8, 6, 11, 8, 4, 6, 9, 0, 1],
|
|
[9, 4, 6, 9, 6, 3, 9, 3, 1, 11, 3, 6],
|
|
[6, 8, 4, 6, 11, 8, 2, 10, 1],
|
|
[1, 2, 10, 3, 0, 11, 0, 6, 11, 0, 4, 6],
|
|
[4, 11, 8, 4, 6, 11, 0, 2, 9, 2, 10, 9],
|
|
[10, 9, 3, 10, 3, 2, 9, 4, 3, 11, 3, 6, 4, 6, 3],
|
|
[8, 2, 3, 8, 4, 2, 4, 6, 2],
|
|
[0, 4, 2, 4, 6, 2],
|
|
[1, 9, 0, 2, 3, 4, 2, 4, 6, 4, 3, 8],
|
|
[1, 9, 4, 1, 4, 2, 2, 4, 6],
|
|
[8, 1, 3, 8, 6, 1, 8, 4, 6, 6, 10, 1],
|
|
[10, 1, 0, 10, 0, 6, 6, 0, 4],
|
|
[4, 6, 3, 4, 3, 8, 6, 10, 3, 0, 3, 9, 10, 9, 3],
|
|
[10, 9, 4, 6, 10, 4],
|
|
[4, 9, 5, 7, 6, 11],
|
|
[0, 8, 3, 4, 9, 5, 11, 7, 6],
|
|
[5, 0, 1, 5, 4, 0, 7, 6, 11],
|
|
[11, 7, 6, 8, 3, 4, 3, 5, 4, 3, 1, 5],
|
|
[9, 5, 4, 10, 1, 2, 7, 6, 11],
|
|
[6, 11, 7, 1, 2, 10, 0, 8, 3, 4, 9, 5],
|
|
[7, 6, 11, 5, 4, 10, 4, 2, 10, 4, 0, 2],
|
|
[3, 4, 8, 3, 5, 4, 3, 2, 5, 10, 5, 2, 11, 7, 6],
|
|
[7, 2, 3, 7, 6, 2, 5, 4, 9],
|
|
[9, 5, 4, 0, 8, 6, 0, 6, 2, 6, 8, 7],
|
|
[3, 6, 2, 3, 7, 6, 1, 5, 0, 5, 4, 0],
|
|
[6, 2, 8, 6, 8, 7, 2, 1, 8, 4, 8, 5, 1, 5, 8],
|
|
[9, 5, 4, 10, 1, 6, 1, 7, 6, 1, 3, 7],
|
|
[1, 6, 10, 1, 7, 6, 1, 0, 7, 8, 7, 0, 9, 5, 4],
|
|
[4, 0, 10, 4, 10, 5, 0, 3, 10, 6, 10, 7, 3, 7, 10],
|
|
[7, 6, 10, 7, 10, 8, 5, 4, 10, 4, 8, 10],
|
|
[6, 9, 5, 6, 11, 9, 11, 8, 9],
|
|
[3, 6, 11, 0, 6, 3, 0, 5, 6, 0, 9, 5],
|
|
[0, 11, 8, 0, 5, 11, 0, 1, 5, 5, 6, 11],
|
|
[6, 11, 3, 6, 3, 5, 5, 3, 1],
|
|
[1, 2, 10, 9, 5, 11, 9, 11, 8, 11, 5, 6],
|
|
[0, 11, 3, 0, 6, 11, 0, 9, 6, 5, 6, 9, 1, 2, 10],
|
|
[11, 8, 5, 11, 5, 6, 8, 0, 5, 10, 5, 2, 0, 2, 5],
|
|
[6, 11, 3, 6, 3, 5, 2, 10, 3, 10, 5, 3],
|
|
[5, 8, 9, 5, 2, 8, 5, 6, 2, 3, 8, 2],
|
|
[9, 5, 6, 9, 6, 0, 0, 6, 2],
|
|
[1, 5, 8, 1, 8, 0, 5, 6, 8, 3, 8, 2, 6, 2, 8],
|
|
[1, 5, 6, 2, 1, 6],
|
|
[1, 3, 6, 1, 6, 10, 3, 8, 6, 5, 6, 9, 8, 9, 6],
|
|
[10, 1, 0, 10, 0, 6, 9, 5, 0, 5, 6, 0],
|
|
[0, 3, 8, 5, 6, 10],
|
|
[10, 5, 6],
|
|
[11, 5, 10, 7, 5, 11],
|
|
[11, 5, 10, 11, 7, 5, 8, 3, 0],
|
|
[5, 11, 7, 5, 10, 11, 1, 9, 0],
|
|
[10, 7, 5, 10, 11, 7, 9, 8, 1, 8, 3, 1],
|
|
[11, 1, 2, 11, 7, 1, 7, 5, 1],
|
|
[0, 8, 3, 1, 2, 7, 1, 7, 5, 7, 2, 11],
|
|
[9, 7, 5, 9, 2, 7, 9, 0, 2, 2, 11, 7],
|
|
[7, 5, 2, 7, 2, 11, 5, 9, 2, 3, 2, 8, 9, 8, 2],
|
|
[2, 5, 10, 2, 3, 5, 3, 7, 5],
|
|
[8, 2, 0, 8, 5, 2, 8, 7, 5, 10, 2, 5],
|
|
[9, 0, 1, 5, 10, 3, 5, 3, 7, 3, 10, 2],
|
|
[9, 8, 2, 9, 2, 1, 8, 7, 2, 10, 2, 5, 7, 5, 2],
|
|
[1, 3, 5, 3, 7, 5],
|
|
[0, 8, 7, 0, 7, 1, 1, 7, 5],
|
|
[9, 0, 3, 9, 3, 5, 5, 3, 7],
|
|
[9, 8, 7, 5, 9, 7],
|
|
[5, 8, 4, 5, 10, 8, 10, 11, 8],
|
|
[5, 0, 4, 5, 11, 0, 5, 10, 11, 11, 3, 0],
|
|
[0, 1, 9, 8, 4, 10, 8, 10, 11, 10, 4, 5],
|
|
[10, 11, 4, 10, 4, 5, 11, 3, 4, 9, 4, 1, 3, 1, 4],
|
|
[2, 5, 1, 2, 8, 5, 2, 11, 8, 4, 5, 8],
|
|
[0, 4, 11, 0, 11, 3, 4, 5, 11, 2, 11, 1, 5, 1, 11],
|
|
[0, 2, 5, 0, 5, 9, 2, 11, 5, 4, 5, 8, 11, 8, 5],
|
|
[9, 4, 5, 2, 11, 3],
|
|
[2, 5, 10, 3, 5, 2, 3, 4, 5, 3, 8, 4],
|
|
[5, 10, 2, 5, 2, 4, 4, 2, 0],
|
|
[3, 10, 2, 3, 5, 10, 3, 8, 5, 4, 5, 8, 0, 1, 9],
|
|
[5, 10, 2, 5, 2, 4, 1, 9, 2, 9, 4, 2],
|
|
[8, 4, 5, 8, 5, 3, 3, 5, 1],
|
|
[0, 4, 5, 1, 0, 5],
|
|
[8, 4, 5, 8, 5, 3, 9, 0, 5, 0, 3, 5],
|
|
[9, 4, 5],
|
|
[4, 11, 7, 4, 9, 11, 9, 10, 11],
|
|
[0, 8, 3, 4, 9, 7, 9, 11, 7, 9, 10, 11],
|
|
[1, 10, 11, 1, 11, 4, 1, 4, 0, 7, 4, 11],
|
|
[3, 1, 4, 3, 4, 8, 1, 10, 4, 7, 4, 11, 10, 11, 4],
|
|
[4, 11, 7, 9, 11, 4, 9, 2, 11, 9, 1, 2],
|
|
[9, 7, 4, 9, 11, 7, 9, 1, 11, 2, 11, 1, 0, 8, 3],
|
|
[11, 7, 4, 11, 4, 2, 2, 4, 0],
|
|
[11, 7, 4, 11, 4, 2, 8, 3, 4, 3, 2, 4],
|
|
[2, 9, 10, 2, 7, 9, 2, 3, 7, 7, 4, 9],
|
|
[9, 10, 7, 9, 7, 4, 10, 2, 7, 8, 7, 0, 2, 0, 7],
|
|
[3, 7, 10, 3, 10, 2, 7, 4, 10, 1, 10, 0, 4, 0, 10],
|
|
[1, 10, 2, 8, 7, 4],
|
|
[4, 9, 1, 4, 1, 7, 7, 1, 3],
|
|
[4, 9, 1, 4, 1, 7, 0, 8, 1, 8, 7, 1],
|
|
[4, 0, 3, 7, 4, 3],
|
|
[4, 8, 7],
|
|
[9, 10, 8, 10, 11, 8],
|
|
[3, 0, 9, 3, 9, 11, 11, 9, 10],
|
|
[0, 1, 10, 0, 10, 8, 8, 10, 11],
|
|
[3, 1, 10, 11, 3, 10],
|
|
[1, 2, 11, 1, 11, 9, 9, 11, 8],
|
|
[3, 0, 9, 3, 9, 11, 1, 2, 9, 2, 11, 9],
|
|
[0, 2, 11, 8, 0, 11],
|
|
[3, 2, 11],
|
|
[2, 3, 8, 2, 8, 10, 10, 8, 9],
|
|
[9, 10, 2, 0, 9, 2],
|
|
[2, 3, 8, 2, 8, 10, 0, 1, 8, 1, 10, 8],
|
|
[1, 10, 2],
|
|
[1, 3, 8, 9, 1, 8],
|
|
[0, 9, 1],
|
|
[0, 3, 8],
|
|
[]
|
|
]
|
|
|
|
## translation between edge index and
|
|
## the vertex indexes that bound the edge
|
|
edgeKey = [
|
|
[(0,0,0), (1,0,0)],
|
|
[(1,0,0), (1,1,0)],
|
|
[(1,1,0), (0,1,0)],
|
|
[(0,1,0), (0,0,0)],
|
|
[(0,0,1), (1,0,1)],
|
|
[(1,0,1), (1,1,1)],
|
|
[(1,1,1), (0,1,1)],
|
|
[(0,1,1), (0,0,1)],
|
|
[(0,0,0), (0,0,1)],
|
|
[(1,0,0), (1,0,1)],
|
|
[(1,1,0), (1,1,1)],
|
|
[(0,1,0), (0,1,1)],
|
|
]
|
|
|
|
|
|
|
|
facets = []
|
|
|
|
## mark everything below the isosurface level
|
|
mask = data < level
|
|
|
|
### make eight sub-fields and compute indexes for grid cells
|
|
index = np.zeros([x-1 for x in data.shape], dtype=np.ubyte)
|
|
fields = np.empty((2,2,2), dtype=object)
|
|
slices = [slice(0,-1), slice(1,None)]
|
|
for i in [0,1]:
|
|
for j in [0,1]:
|
|
for k in [0,1]:
|
|
fields[i,j,k] = mask[slices[i], slices[j], slices[k]]
|
|
vertIndex = i - 2*j*i + 3*j + 4*k ## this is just to match Bourk's vertex numbering scheme
|
|
#print i,j,k," : ", fields[i,j,k], 2**vertIndex
|
|
index += fields[i,j,k] * 2**vertIndex
|
|
#print index
|
|
#print index
|
|
|
|
## add facets
|
|
for i in xrange(index.shape[0]): # data x-axis
|
|
for j in xrange(index.shape[1]): # data y-axis
|
|
for k in xrange(index.shape[2]): # data z-axis
|
|
tris = triTable[index[i,j,k]]
|
|
for l in range(0, len(tris), 3): ## faces for this grid cell
|
|
edges = tris[l:l+3]
|
|
pts = []
|
|
for m in [0,1,2]: # points in this face
|
|
p1 = edgeKey[edges[m]][0]
|
|
p2 = edgeKey[edges[m]][1]
|
|
v1 = data[i+p1[0], j+p1[1], k+p1[2]]
|
|
v2 = data[i+p2[0], j+p2[1], k+p2[2]]
|
|
f = (level-v1) / (v2-v1)
|
|
fi = 1.0 - f
|
|
p = ( ## interpolate between corners
|
|
p1[0]*fi + p2[0]*f + i + 0.5,
|
|
p1[1]*fi + p2[1]*f + j + 0.5,
|
|
p1[2]*fi + p2[2]*f + k + 0.5
|
|
)
|
|
pts.append(p)
|
|
facets.append(pts)
|
|
|
|
return facets
|
|
|
|
|
|
def meshNormals(data):
|
|
"""
|
|
Return list of normal vectors and list of faces which reference the normals
|
|
data must be list of triangles; each triangle is a list of three points
|
|
[ [(x,y,z), (x,y,z), (x,y,z)], ...]
|
|
Return values are
|
|
normals: [(x,y,z), ...]
|
|
faces: [(n1, n2, n3), ...]
|
|
"""
|
|
|
|
normals = []
|
|
points = {}
|
|
for i, face in enumerate(data):
|
|
## compute face normal
|
|
pts = [QtGui.QVector3D(*x) for x in face]
|
|
norm = QtGui.QVector3D.crossProduct(pts[1]-pts[0], pts[2]-pts[0])
|
|
normals.append(norm)
|
|
|
|
## remember each point was associated with this normal
|
|
for p in face:
|
|
p = tuple(map(lambda x: np.round(x, 8), p))
|
|
if p not in points:
|
|
points[p] = []
|
|
points[p].append(i)
|
|
|
|
## compute averages
|
|
avgLookup = {}
|
|
avgNorms = []
|
|
for k,v in points.iteritems():
|
|
norms = [normals[i] for i in v]
|
|
a = norms[0]
|
|
if len(v) > 1:
|
|
for n in norms[1:]:
|
|
a = a + n
|
|
a = a / len(v)
|
|
avgLookup[k] = len(avgNorms)
|
|
avgNorms.append(a)
|
|
|
|
## generate return array
|
|
faces = []
|
|
for i, face in enumerate(data):
|
|
f = []
|
|
for p in face:
|
|
p = tuple(map(lambda x: np.round(x, 8), p))
|
|
f.append(avgLookup[p])
|
|
faces.append(tuple(f))
|
|
|
|
return avgNorms, faces
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|