public static Escaping Instance(float speed, float radius, int threshold, short? objType)
 {
     var key = new Tuple<float, float, int, short?>(speed, radius, threshold, objType);
     Escaping ret;
     if (!instances.TryGetValue(key, out ret))
         ret = instances[key] = new Escaping(speed, radius, threshold, objType);
     return ret;
 }
 public static Escaping Instance(float speed, float radius, int threshold, short? objType)
 {
     var key = new Tuple<float, float, int, short?>(speed, radius, threshold, objType);
     Escaping ret;
     if (!instances.TryGetValue(key, out ret))
         ret = instances[key] = new Escaping(speed, radius, threshold, objType);
     return ret;
 }