Merging meshes

Merging meshes is a common operation in mesh processing. It is used to combine two or more meshes into a single one. This can be useful when you want to combine meshes from different sources.

import krado

mesh1 = krado.import_mesh("path/to/mesh1.exo")
mesh2 = krado.import_mesh("path/to/mesh2.exo")

merged_mesh = mesh1.add(mesh2)

merged_mesh.set_up()
krado.export_mesh(merged_mesh, "path/to/merged_mesh.exo")

Note that if the meshes share nodes, the nodes will be duplicated in the merged mesh. To remove duplicate nodes, you can use the krado.Mesh.remove_duplicate_points()

merged_mesh.remove_duplicate_points(1e-10)

merged_mesh.set_up()
krado.export_mesh("path/to/merged_mesh.exo", merged_mesh)

The parameter 1e-10 is the (absolute) tolerance that decides if two nodes are identical or not. To see if nodes were actaully merged, turn on diagnostic report:

krado.log.set_verbosity(2)      # 2 or higher number will print the dianostic report

Then, you get a report like so:

[info] Diagnostics:
[info]   Total close pairs: 2
[info]   Histogram (0.0 = identical, 1.0 = exactly at tolerance)
[info]   0.0 – 0.1 | 2 ++++++++++++++++++++++++++++++++++++++++++++++++++
[info]   0.1 – 0.2 | 0
[info]   0.2 – 0.3 | 0
[info]   0.3 – 0.4 | 0
[info]   0.4 – 0.5 | 0
[info]   0.5 – 0.6 | 0
[info]   0.6 – 0.7 | 0
[info]   0.7 – 0.8 | 0
[info]   0.8 – 0.9 | 0
[info]   0.9 – 1.0 | 0
[info]   Smallest separation: 0

Large counts in the first bins indicate tight node alignment. Large counts in the last bin suggest the tolerance may be too small.