Optional Inputs for ChElementShellBST in PyChrono

[Qian Cao]

Hello,

According to the documentation, there 3 optional inputs in ChElementShellBST for neighboring nodes in the triangular mesh:

https://api.projectchrono.org/classchrono_1_1fea_1_1_ch_element_shell_b_s_t.html

What is the correct way to specify a "nullptr" in pychrono? Do I just pass in a None? Or do I pass in node initialized with a ChVectorD that's been SetNull()?

from pychrono.fea import fea

nullvec = chrono.ChVectorD()

nullvec.SetNull()

nullnode = fea.ChNodeFEAxyz(nullvec)

element = fea.ChElementShellBST()
element.SetNodes(node0, node1, node2, None, node4, nullnode)

Thanks,

Qian

[ben...@wisc.edu]

Hi Qian,

SetNull is a ChVector method that sets x,y,z = 0, so definitely not what you're looking for.

The Python equivalent of nullptr is, in fact, None.

There is also an example here:

https://github.com/projectchrono/chrono/blob/develop/src/demos/python/fea/demo_FEA_shellsBST.py

Thanks,

Simon