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Py Mathutils: add invert_safe() and inverted_safe() to Matrix.

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Those two mimic our BLI invert_m4_m4_safe - they add a small offset to diagonal values,
in case org matrix is degenerated, and if still non-invertible, return identity matrix.

Org patch by me, final enhanced version by ideasman42, many thanks!
This commit is contained in:
Bastien Montagne
2014-09-06 14:54:08 +02:00
parent f670a8aeaa
commit e44c49d89d
3 changed files with 204 additions and 61 deletions
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23
tests/python/bl_pyapi_mathutils.py
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@@ -162,6 +162,29 @@ class MatrixTesting(unittest.TestCase):
self.assertEqual(mat.inverted(), inv_mat)
def test_matrix_inverse_safe(self):
mat = Matrix(((1, 4, 0, -1),
(2, -1, 0, -2),
(0, 3, 0, 3),
(-2, 9, 0, 0)))
# Warning, if we change epsilon in py api we have to update this!!!
epsilon = 1e-8
inv_mat_safe = mat.copy()
inv_mat_safe[0][0] += epsilon
inv_mat_safe[1][1] += epsilon
inv_mat_safe[2][2] += epsilon
inv_mat_safe[3][3] += epsilon
inv_mat_safe.invert()
'''
inv_mat_safe = Matrix(((1.0, -0.5, 0.0, -0.5),
(0.222222, -0.111111, -0.0, 0.0),
(-333333344.0, 316666656.0, 100000000.0, 150000000.0),
(0.888888, -0.9444444, 0.0, -0.5)))
'''
self.assertEqual(mat.inverted_safe(), inv_mat_safe)
def test_matrix_mult(self):
mat = Matrix(((1, 4, 0, -1),
(2, -1, 2, -2),