def Normal(self):
# () -> np.ndarray
r"""
Get the normal vector, :math:`n`.
5
/ \
6 4
/ \
1----2----3
.. math::
n = \frac{(n_0-n_1) \times (n_0-n_2)}
{\lvert (n_0-n_1) \times (n_0-n_2) \lvert}
"""
nodes = [self.nodes_ref[inid] for inid in [0, 2, 4]]
n1, n3, n5 = self.get_node_positions(nodes=nodes)
try:
n = _normal(n1 - n3, n1 - n5)
except:
msg = 'ERROR computing normal vector for eid=%i.\n' % self.eid
msg += ' nid1=%i n1=%s\n' % (self.nodes_ref[0].nid, n1)
msg += ' nid3=%i n3=%s\n' % (self.nodes_ref[2].nid, n3)
msg += ' nid5=%i n5=%s\n' % (self.nodes_ref[4].nid, n5)
raise RuntimeError(msg)
return n
def Normal(self):
(n1, n2, n3, n4) = self.get_node_positions()[:4]
return _normal(n1 - n3, n2 - n4)
def Normal(self):
(n1, n2, n3, n4) = self.get_node_positions()[:4]
return _normal(n1 - n3, n2 - n4)