cross_product

Section: Allegro manual (3)
Updated: version 4.2.2
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NAME

cross_product, cross_product_f - Calculates the cross product. Allegro game programming library.  

SYNOPSIS

#include <allegro.h>

void cross_product(fixed x1, y1, z1, x2, y2, z2, *xout, *yout, *zout);

void cross_product_f(float x1, y1, z1, x2, y2, z2, *xout, *yout, *zout);  

DESCRIPTION

Calculates the cross product (x1, y1, z1) x (x2, y2, z2), storing the result in (*xout, *yout, *zout). The cross product is perpendicular to both of the input vectors, so it can be used to generate polygon normals.

 

SEE ALSO

dot_product(3), polygon_z_normal(3), normalize_vector(3), exstars(3)