Parallel, Cylindrical, and Spherical Selection Rules are simple shapes which can be defined by a few parameters:
Parallel: Defined by two parallel planes. The planes are defined by an origin, a normal vector and two distances (offsets of the planes from the origin along the normal vector).
Cylindrical: The cylinder is defined by an origin and the vector of the axial direction and the radius. The cylinder has infinite height.
Spherical: The sphere is defined by the center and the radius.
Selection Rule based on Rosettes
Parallel, Cylindrical, and Spherical Selection Rules can be defined in terms of the coordinate relative to a specific Rosette. To choose a Rosette, uncheck "Use global Coordinate System" and select a Rosette from the drop-down menu. If a Rosette is selected, Origin and Direction are in the Rosette's reference frame. Only parallel Rosettes can be used to define Selection Rules.
Relative Selection Rule
It is possible to define a Selection Rule as relative. In this case, the Selection Rule parameters define the ratios of the selection rule relative to the Modeling Ply dimensions. Take care that the Plotted Selection rule is evaluated from the global geometry dimensions and that this plot does not represent the final shape of the Selection Rule which depends on the Modeling Ply. Select the ply and check the highlighted elements which represent the final shape of the ply.
Include Selection Rule
The Include Selection Rule Type option can be used to select the elements inside the geometry or outside. By default the option is active (as shown in Figure 2.49: Example of a Parallel Selection Rule). If the option is inactive, the inverse selection takes effect. Plies with a hole can be created through a Cylindrical Selection Rule and disabled Include Selection Rule Type option. This option applies to all geometrical rules as well as the Tube Selection Rule.