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

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

QuickDraw 3D Mathematical Utilities / Determining Point Affine Combinations

Q3RationalPoint4D_AffineComb

You can use the Q3RationalPoint4D_AffineComb function to determine the rational four-dimensional point that is the affine combination of an array of points.

TQ3RationalPoint4D *Q3RationalPoint4D_AffineComb (
const TQ3RationalPoint4D *points4D, 
const float *weights, 
unsigned long nPoints, 
TQ3RationalPoint4D *result);

points4D

A pointer to an array of rational four-dimensional points.

weights

A pointer to an array of weights. The weights must sum to 1.0.

nPoints

The number of points in the points4D array.

result

On exit, the point that is the affine combination of the points in points4D which have the weights in the weights array.

DESCRIPTION

The Q3RationalPoint4D_AffineComb function returns, as its function result and in the result parameter, the rational point that is the affine combination of the points in the array points4D which have the weights in the array weights.