Layer Selections
The By layer import method is an efficient way of creating selections when used together with the Layer selections option for the import. Easily identifiable selections with layer names are automatically created and can be used for assigning mesh size or physics settings, for example material properties.
In the following you will use these selections to assign appropriate materials, but first let’s review the selection settings for the import.
1
In the Model Builder window click the Import 1 node.
2
In the Settings window for Import, locate and expand the Selections of Resulting Entities section.
By default the Layer Selections checkbox is selected, and the Show in physics list is set to All levels so that the layer selections for domains and boundaries will be available in the physics and mesh settings. You may also choose Domain selection or Boundary selection, or turn off the display of these selections in physics altogether. For this latter case the selections will still be available in the geometry sequence.
3
In the Model Builder, click on Geometry 1 node. Make sure that the checkbox Automatic detection of small details is selected under Cleanup section.
4
In the Home toolbar click  Add Materials to open the Add Material window.
After import, selection called Metal was created and it includes everything in the files specified as metal. This single selection can be used for assigning materials or a meshing operation.
5
In the tree, select Built-in > Copper.
6
Right click and choose Add to Component 1. If the Automatic detection of small details checkbox is selected under Geometry 1 node, this action will bring up a dialog from Geometry Cleanup. Some small details have been detected that could make the meshing difficult.
7
Click Clean up Automatically.
8
After the cleanup is finished click  Add Material to close the Add Material window.
9
Click the Copper node and locate the Geometric Entity Selection section.
10
From the selection list, choose Metal.
Notice that we have two more selection available apart from the individual selection. Metal is a selection that includes all the metal specified in the file, and Dielectric is a selection of everything else.
11
For a better view of the selection click the Wireframe button in the Graphics toolbar.