#include <math.h>
#include "typedefs.h"

double normalize(t_3d *a)
{
	double d;
	d = sqrt(a->x * a->x + a->y * a->y + a->z * a->z);
	a->x /= d;
	a->y /= d;
	a->z /= d;
	return d;
}

double dotp(t_3d *a, t_3d *b)
{
	double d;
	d = (a->x * b->x) + (a->y * b->y) + (a->z * b->z);
	return d;
}

int crossp(t_3d *o, t_3d *a, t_3d *b)
{
	double d;
	o->x = (a->y * b->z) - (a->z * b->y);
	o->y = (a->z * b->x) - (a->x * b->z);
	o->z = (a->x * b->y) - (a->y * b->x);
	d = sqrt(o->x * o->x + o->y * o->y + o->z * o->z);
	o->x /= d;
	o->y /= d;
	o->z /= d;

	return d;
}