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Fixed 2D volume calculation.

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This commit is contained in:
Rowan Cockett
2013-07-29 23:02:25 -07:00
parent 079acb1153
commit ead836c341
2 changed files with 16 additions and 10 deletions
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SimPEG/utils.py
+4 -4
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@@ -247,9 +247,9 @@ def faceInfo(xyz, A, B, C, D, average=True):
DA = xyz[A, :] - xyz[D, :]
def cross(X, Y):
return np.c_[X[1, :]*Y[2, :] - X[2, :]*Y[1, :],
X[2, :]*Y[0, :] - X[0, :]*Y[2, :],
X[0, :]*Y[1, :] - X[1, :]*Y[0, :]]
return np.c_[X[:, 1]*Y[:, 2] - X[:, 2]*Y[:, 1],
X[:, 2]*Y[:, 0] - X[:, 0]*Y[:, 2],
X[:, 0]*Y[:, 1] - X[:, 1]*Y[:, 0]]
nA = cross(AB, DA)
nB = cross(BC, AB)
@@ -257,7 +257,7 @@ def faceInfo(xyz, A, B, C, D, average=True):
nD = cross(DA, CD)
length = lambda x: (x[:, 0]**2 + x[:, 1]**2 + x[:, 2]**2)**0.5
normalize = lambda x: x/np.kron(np.ones((1, x.shape[1]), length(x), 1))
normalize = lambda x: x/np.kron(np.ones((1, x.shape[1])), mkvc(length(N), 2))
if average:
# average the normals at each vertex.
N = (nA + nB + nC + nD)/4 # this is intrinsically weighted by area