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

Chapter 4 - Geometric Objects / Geometric Objects Reference

Geometric Objects Routines / Creating and Editing General Polygons

Q3GeneralPolygon_GetVertexPosition

You can use the Q3GeneralPolygon_GetVertexPosition function to get the position of a vertex of a general polygon.

TQ3Status Q3GeneralPolygon_GetVertexPosition (
TQ3GeometryObject generalPolygon, 
unsigned long contourIndex, 
unsigned long pointIndex, 
TQ3Point3D *position);

generalPolygon

A general polygon.

contourIndex

An index into the contours array of the specified general polygon. This index should be greater than or equal to 0 and less than the number of contours in the contours array.

pointIndex

An index into the vertices array of the specified contour. This index should be greater than or equal to 0 and less than the number of points in the vertices array.

position

On exit, the position of the specified vertex.

DESCRIPTION

The Q3GeneralPolygon_GetVertexPosition function returns, in the position parameter, the position of a vertex in the general polygon specified by the generalPolygon parameter. The vertex has the index specified by the pointIndex parameter in the vertices array of the contour specified by the contourIndex parameter.