const double Utils::getAngleBetweenVectors(const Zeni::Vector3f &v0, const Zeni::Vector3f &v1) {
const double a = v0.magnitude();
const double b = v1.magnitude();
const double c = (v1 - v0).magnitude();
double d = (a * a + b * b - c * c) / (2 * a * b);
if (d > 1) {
d = 1.0f;
} else if (d < -1.0f) {
d = -1.0f;
}
return double(acos(d));
}
const Zeni::Vector3f Utils::getVectorComponent(const Zeni::Vector3f &vector, const Zeni::Vector3f &direction) {
return vector*direction/direction.magnitude() * direction.normalized();
}