man dot_product () - Calculates the dot product. Allegro game programming library.
NAME
dot_product, dot_product_f - Calculates the dot product. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
fixed dot_product(fixed x1, y1, z1, x2, y2, z2);
float dot_product_f(float x1, y1, z1, x2, y2, z2);
DESCRIPTION
Calculates the dot product (x1, y1, z1) . (x2, y2, z2), returning the result.