Use Create Domains (

) to create one domain for each (connected) finite void region that is defined by an imported 3D mesh and analyze these domains with respect to the mesh that might already exist in the sequence.
Together with the Free Tetrahedral operation, the
Create Domains operation makes it possible to mesh an imported surface meshes without creating a geometry, as long as the imported surface mesh is of good quality. To improve the quality of a surface mesh, use
Remesh Faces.
Add a Create Domains node, choose one of the following:
Select the Resulting domains checkbox to create a predefined selection in subsequent nodes in the mesh sequence. To also make the selection available in all applicable selection lists in physics and materials settings, for example, select the
Show in physics (
Show in instances if in a mesh part) checkbox. These selections do not appear as separate selection nodes in the model tree. From the
Color list, choose a color for highlighting the resulting objects selection. See
Selection Colors and
Creating Named Selections in Mesh Sequences.