Boolean selections — Union Selection (
),
Intersection Selection (
),
Difference Selection (
), and
Complement Selection (
) — are useful to combine two or more selections (union), create a selection of entities that are common to the input selections (intersections), create a selection of entities that are in one selection but not in another (difference), and to create a selection as the complement (inverse) of one or more selections. The complement can be convenient if a selection is needed that consists of all boundaries except one or a few (all boundaries except the inflow boundaries, for example). Then it is easier to first create a selection (just the one boundary, for example) and then use a
Complement Selection node to create its complement. All Boolean selection nodes’
Settings windows have similar sections.
To add one of these nodes, right-click the Geometry node and choose an option from the
Selections menu.
Based on space dimension, select a Level —
Domain,
Boundary,
Edge (3D only), or
Point for the selections to add or remove from the
Selections to add (
Selections to intersect,
Selections to subtract, and
Selections to invert) list.
Based on space dimension, select a Geometric entity level:
Domain,
Boundary,
Edge, or
Point for the entities to add to the selection.
Click the Add button (
) to open an
Add dialog that contains all previously defined selections for the same geometric entity level. Select one or several of the selections and click
OK; you can use the search bar to filter the list. Use the
Delete (
) button to delete any selection from the list. The selected entities are highlighted in the
Graphics window.
Select the Show in physics checkbox (selected by default) to make the resulting selection available as a named selection should appear in applicable settings for physics, materials, and other parts of the model tree outside of the mesh sequence or in instances of the mesh part. Clear the checkbox to keep the selection local to this mesh sequence.
) menu.
) menu.
