3D Graphics Programming with QuickDraw 3D 1.5.4

Using Pick Objects

A pick object contains all the information necessary to calculate geometric intersections between the pick geometry and the objects in a model. To create a pick object, you need to fill out data structures with the appropriate information, including

how the hits are to be sorted
how many hits to return
what information should be returned about any hits
whether to pick whole objects or parts of objects
how much tolerance to allow when calculating hits
the pick geometry

The following sections illustrate how to perform these tasks.

Handling Object Picking

Handling Mesh Part Picking

Picking in Immediate Mode