MergeMeshes overset cell vertex messing
Background overset mesh created with SHM is nice and castellated.
Overset mesh is created with SHM. Mesh is nice cylinder and rather OK quality.
After the mergeMeshes the following happens
MergeMesh is NOT run in parallel. When renumbering meshes before merging, only one pierced cell is created, when not renumbering, more are created. Mesh has 8 mil. cells