Picking Parts Styles

A model's picking parts style determines the kinds of objects that are eligible for placement in a hit list during a pick operation. Currently, you can use the picking parts style to limit your attention to certain parts of a mesh. The picking parts style is specified by a value defined using one or more pick parts masks, which are defined by these constants:

typedef enum TQ3PickPartsMasks {
    kQ3PickPartsObject                                      = 0,
    kQ3PickPartsMaskFace                                    = 1 << 0,
    kQ3PickPartsMaskEdge                                    = 1 << 1,
    kQ3PickPartsMaskVertex                                  = 1 << 2
} TQ3PickPartsMasks;


The default picking parts style is kQ3PickPartsObject , which indicates that the hit list is to contain only whole objects. You can add in the other masks to select parts of a mesh for picking. For instance, to pick edges and vertices, you would draw a pick parts style using the value:

kQ3PickPartsMaskEdge | kQ3PickPartsMaskVertex


For a description of mesh parts, see the chapter "Geometric Objects." For complete information about picking parts, see the chapter "Pick Objects."

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© 1997 Apple Computer, Inc.

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