Areas and Plane Equations (IM: QD3D)

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

Chapter 4 - Geometric Objects / Geometric Objects Reference

Areas and Plane Equations
A two-dimensional area is defined by the TQ3Area data type.
typedef struct TQ3Area {
   TQ3Point2D                 min;
   TQ3Point2D                 max;
} TQ3Area;
Field Description

min
A two-dimensional point.
max
A two-dimensional point.
A plane equation is defined by the TQ3PlaneEquation data type.
typedef struct TQ3PlaneEquation {
   TQ3Vector3D                normal;
   float                      constant;
} TQ3PlaneEquation;
Field Description

normal
The vector that is normal (perpendicular) to the plane.
constant
The plane constant. A plane constant is the value d in the plane equation ax+by+cz+d = 0. The coefficients a, b, and c are the x, y, and z components of the normal vector.