collapse_bad_quads Module

defines:
  • convert_bad_quads_to_tris(model, eids_to_check=None, xyz_cid0=None,

    min_edge_length=0.0)

pyNastran.bdf.mesh_utils.collapse_bad_quads.convert_bad_quads_to_tris(model: BDF, eids_to_check: List[int] = None, xyz_cid0: Optional[np.ndarray] = None, min_edge_length: float = 0.0) → None[source]

A standard quad is a nice rectangle. If an edge is collapsed, it’s a triangle. Change the element type with an inplace operation. Deletes any line elements created.

Parameters
modelBDF()

a BDF model that has not had it’s properties/load xref’d, but is valid such that it could

eidslist; (default=None -> all CQUAD4s)

the subset of element ids to check

xyz_cid0(n, 3) ndarray

nodes in cid=0

min_edge_lengthfloat; default=0.0

what is classified as “short”

.. warning:: Don’t cross reference properties/loads
.. todo:: check for bad xref
pyNastran.bdf.mesh_utils.collapse_bad_quads.delete_bad_tris(model: BDF, eids_to_check: List[int] = None, xyz_cid0: Optional[np.ndarray] = None, min_edge_length: float = 0.0) → None[source]

If an triangular edge is collapsed, it’s a line and should be deleted.

Parameters
modelBDF()

a BDF model that has not had it’s properties/load xref’d, but is valid such that it could

eidslist; (default=None -> all CTRIA3s)

the subset of element ids to check

xyz_cid0(n, 3) ndarray

nodes in cid=0

min_edge_lengthfloat; default=0.0

what is classified as “short”

.. warning:: Don’t cross reference properties/loads
.. todo:: check for bad xref