mesh.Mesh.reverse#

Mesh.reverse(sel=None, inplace=False)#

Reverse some or all elements of a Mesh.

Reversing an element has the following meaning:

for 1D elements: reverse the traversal direction,
for 2D elements: reverse the direction of the positive normal,
for 3D elements: reverse inside and outside directions of the element’s border surface. This also changes the sign of the element’s volume.

Parameters#

sel: int or boolean array_like, optional: The selected elements to be reversed. Default is to reverse all elements.

Returns#

Mesh: A Mesh like the input but with the specified elements reversed.

Notes#

The reflect() method by default calls this method to undo the element reversal caused by the reflection operation.

Examples#

>>> M = Mesh(eltype='tri3')
>>> print(M.elems)
[[0 1 2]]
>>> M1 = M.reverse()
>>> print(M1.elems)
[[2 1 0]]
>>> print(M.elems)
[[0 1 2]]
>>> print(M.reverse(inplace=True).elems)
[[2 1 0]]