+template<class T>
+T manhattan_distance(const glm::tvec3<T> &a, const glm::tvec3<T> &b) {
+ glm::tvec3<T> diff(abs(a - b));
+ return diff.x + diff.y + diff.z;
+}
+
+template<class T>
+T manhattan_radius(const glm::tvec3<T> &v) {
+ glm::tvec3<T> a(abs(v));
+ return std::max(a.x, std::max(a.y, a.z));
+}
+
+