cartesianToSpherical / sphericalToCartesian

Spherical coordinate

ofVec3f cartesianToSpherical(const ofVec3f &v)
{
	float r = v.length();
	float s = acos(v.z / r);
	float f = atan2(v.y, v.x);
	return ofVec3f(r, s, f);
}

ofVec3f sphericalToCartesian(const ofVec3f &v)
{
	ofVec3f vv;
	vv.x = v.x * sin(v.y) * cos(v.z);
	vv.y = v.x * sin(v.y) * sin(v.z);
	vv.z = v.x * cos(v.y);
	return vv;
}