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

Chapter 4 - Geometric Objects / Geometric Objects Reference

Data Structures

Triangles

A triangle is a closed plane figure defined by the three edges that connect three vertices. The entire triangle can have a set of attributes, and any or all of the three vertices can also have a set of attributes. A triangle is defined by the TQ3TriangleData data type. See "Creating and Editing Triangles," beginning on page 4-76 for a description of the routines you can use to create and edit triangles. Figure 4-12 shows a triangle.

Figure 4-12 A triangle

typedef struct TQ3TriangleData {
   TQ3Vertex3D                vertices[3];
   TQ3AttributeSet            triangleAttributeSet;
} TQ3TriangleData;

Field Description

vertices

The three vertices that define the three sides of the triangle.

triangleAttributeSet

A set of attributes for the triangle. The value in this field is NULL if no triangle attributes are defined.