s3d_vector_cross_product - calculate cross product of two vectors
#include <s3d.h>
void s3d_vector_cross_product(const float vector1[],
const float vector2[],
float result_vector[]);
Calculates and returns the cross product of vector1 and vector2. All
vectors should have the format float[3]. More info on wikipedia.
http://en.wikipedia.org/wiki/Vector_(spatial)
Simon Wunderlich
Author of s3d