vector3.cpp

#include <math.h>

#include "vector3.h"



vector3 vector3::normalize() {

	float length = sqrt((x * x) + (y * y) + (z * z));

	if ((length > -0.01) && (length < 0.01))

		return vector3(0.0, 0.0, 0.0);

	else

		return vector3((x / length), (y / length), (z / length));

}



vector3 vector3::add(vector3 v) {

	return vector3(x + v.x, y + v.y, z + v.z);

}



vector3 vector3::subtract(vector3 v) {

	return vector3(x - v.x, y - v.y, z - v.z);

}



vector3 vector3::scalar(float f) {

	return vector3(x * f, y * f, z * f);

}



float vector3::dot(vector3 v) {

	return ((x * v.x) + (y * v.y) + (z * v.z));

}



vector3 vector3::cross(vector3 v) {

	float x1 = (y * v.z) - (z * v.y);

	float y1 = (z * v.x) - (x * v.z);

	float z1 = (x * v.y) - (y * v.x);



	return vector3(x1, y1, z1);

}



vector3 vector3::reflect(vector3 norm) {

	// u = v - 2 * |Inc * Norm| * Norm

	vector3 n_inc = normalize();

	float   term1 = 2 * n_inc.dot(norm);

	vector3 term2 = norm.scalar(term1);



	return vector3(n_inc.subtract(term2));

}



float vector3::distance(vector3 v) {

	float dx = v.x - x;

	float dy = v.y - y;

	float dz = v.z - z;

	return sqrt((dx * dx) + (dy * dy) + (dz * dz));

}