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

Chapter 4 - Geometric Objects / Geometric Objects Reference

Data Structures

Parametric Points

QuickDraw 3D defines the TQ3Param2D and TQ3Param3D data structures to represent two- and three-dimensional parametric points.

typedef struct TQ3Param2D {
   float       u;
   float       v;
} TQ3Param2D;
typedef struct TQ3Param3D {
   float       u;
   float       v;
   float       w;
} TQ3Param3D;

Field Description

u

The u component of a parametric point.

v

The v component of a parametric point.

w

The w component of a parametric point.

Note

The u, v, and w components are sometimes represented by the letters s, t, and u, respectively. This book always uses u, v, and w.