Method distance

jni/venus/vec3.h:228–232

	}

	friend T distance(const vec3<T>& pt1, const vec3<T>& pt2)
	{
		vec3<T> v = pt2 - pt1;
		return v.length();
	}

	friend T dot(const vec3<T>& v1, const vec3<T>& v2)
	{