### 2.1.7. Selection Rules

Selection Rules allow you to select elements through geometrical operations. These selections can be combined with Oriented Selection Sets or Modeling Plies to define plies of arbitrary shape. The final extension of the ply is the intersection of the Selection Rule and the selected Oriented Selection Sets. This feature can be used to define local reinforcements (patches) or staggering. You can select between different selection rule types which are explained in the sections below. It is also possible to combine different rules.

Figure : Selection Rules Context Menu

When multiple Selection Rules are used in combination they behave like sequential filters. If there is no common area of intersection then no elements are selected. Two Selection Rules have to overlap to select any elements.

The .CSV file interface of ACP offers the ability to create or modify selection rules externally or share them with other ACP users working on the same model or even on a different project.

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