Inside Macintosh: 3D Graphics Programming With QuickDraw 3D /

Chapter 20 - QuickDraw 3D Mathematical Utilities / QuickDraw 3D Mathematical Utilities Reference

Data Structures

Bounding Spheres

A bounding sphere is a sphere that completely encloses an object. A bounding sphere is defined by the TQ3BoundingSphere data type.

typedef struct TQ3BoundingSphere {
   TQ3Point3D                 origin;
   float                      radius;
   TQ3Boolean                 isEmpty;
} TQ3BoundingSphere;

Field Description

origin

The origin of the bounding sphere.

radius

The radius of the bounding sphere; all points making up the bounding sphere are this far away from the origin of the sphere.

isEmpty

A Boolean value that specifies whether the bounding sphere is empty (kQ3True) or not (kQ3False). If this field contains the value kQ3True, the other field of this structure are invalid.