+ return length2(v) < std::numeric_limits<typename T::value_type>::epsilon();
+}
+
+template<class Vec>
+inline void limit(Vec &v, float max) noexcept {
+ float len2 = length2(v);
+ float max2 = max * max;
+ if (len2 > max2) {
+ v = normalize(v) * max;
+ }