diff --git a/fastlib2/fastlib/tree/bounds.h b/fastlib2/fastlib/tree/bounds.h
index 0b595bb167..058077ec85 100644
--- a/fastlib2/fastlib/tree/bounds.h
+++ b/fastlib2/fastlib/tree/bounds.h
@@ -33,10 +33,10 @@ class DHrectBound {
   DRange *bounds_;
   index_t dim_;
 
-  OBJECT_TRAVERSAL(DHrectBound) {
-    OT_OBJ(dim_);
-    OT_ALLOC(bounds_, dim_);
-  };
+  OT_DEF(DHrectBound) {
+    OT_MY_OBJECT(dim_);
+    OT_MALLOC_ARRAY(bounds_, dim_);
+  }
 
  public:
   /**
@@ -85,18 +85,7 @@ class DHrectBound {
     DEBUG_BOUNDS(i, dim_);
     return bounds_[i];
   }
-  
-  /**
-   * Calculates the maximum distance within the rectangle
-   */
-  double CalculateMaxDistanceSq() const {
-    double max_distance=0;
-    for (index_t i = 0; i < dim_; i++) {
-      max_distance+=math::Sqr(bounds_[i].width());
-    }
-    return max_distance;  
-  }
-  
+
   /** Calculates the midpoint of the range */
   void CalculateMidpoint(Vector *centroid) const {
     centroid->Init(dim_);
@@ -104,13 +93,6 @@ class DHrectBound {
       (*centroid)[i] = bounds_[i].mid();
     }
   }
-  /** Calculates the midpoint of the range */
-  void CalculateMidpointOverwrite(Vector *centroid) const {
-    for (index_t i = 0; i < dim_; i++) {
-      (*centroid)[i] = bounds_[i].mid();
-    }
-  }
-
 
   /**
    * Calculates minimum bound-to-point squared distance.
@@ -172,7 +154,6 @@ class DHrectBound {
     return math::Pow<2, t_pow>(sum) / 4;
   }
 
-
  
  /**
   * Calcualtes minimum bound-to-bound squared distance, with
@@ -188,8 +169,8 @@ class DHrectBound {
    //Add Debug for offset vector
 
    for (index_t d = 0; d < mdim; d++) {
-     double v1 = b[d].lo + offset[d] - a[d].hi;
-     double v2 = a[d].lo - offset[d] - b[d].lo;
+     double v1 = b[d].lo - offset[d] - a[d].hi;
+     double v2 = a[d].lo + offset[d] - b[d].lo;
 
      double v = (v1 + fabs(v1)) + (v2 + fabs(v2));
 
@@ -199,7 +180,7 @@ class DHrectBound {
    return math::Pow<2, t_pow>(sum) / 4;
  }
 
-
+ 
   /**
    * Calculates maximum bound-to-point squared distance.
    */
@@ -245,13 +226,37 @@ class DHrectBound {
     DEBUG_SAME_SIZE(dim_, other.dim_);
 
     for (index_t d = 0; d < dim_; d++) {
-      double v = std::max(b[d].hi + offset[d] - a[d].lo, 
-			  a[d].hi - offset[d] - b[d].lo);
+      double v = std::max(b[d].hi - offset[d] - a[d].lo, 
+			  a[d].hi + offset[d] - b[d].lo);
       sum += math::PowAbs<t_pow, 1>(v); // v is non-negative
     }
 
     return math::Pow<2, t_pow>(sum);
-  }
+ }
+
+ double PeriodicMinDistanceSq(const DHrectBound& other, const Vector& box_size)
+ const {
+   double sum = 0;
+   const DRange *a = this->bounds_;
+   const DRange *b = other.bounds_;
+   
+   DEBUG_SAME_SIZE(dim_, other.dim_);
+   
+   for (index_t d = 0; d < dim_; d++){
+     double v = 0;
+     bool i,j,k,l;
+     i = a[d].lo < a[d].hi;
+     j = b[d].lo < b[d].hi;
+     k = a[d].hi > b[d].lo;
+     l = b[d].hi > a[d].lo;
+     v = ((i^j) & !(k | l)) * std::min(a[d].lo - b[d].hi, b[d].lo - a[d].hi);
+     v = v + (i & j & (k ^ l)) * std::min(a[d].lo - b[d].hi + l*box_size[d], 
+					    b[d].lo - a[d].hi + k*box_size[d]);
+     sum += math::PowAbs<t_pow, 1>(v);
+   }
+   
+   return math::Pow<2, t_pow>(sum);
+ }
 
 
   /**
@@ -460,9 +465,9 @@ class DBallBound {
   double radius_;
   TPoint center_;
 
-  OBJECT_TRAVERSAL(DBallBound) {
-    OT_OBJ(radius_);
-    OT_OBJ(center_);
+  OT_DEF(DBallBound) {
+    OT_MY_OBJECT(radius_);
+    OT_MY_OBJECT(center_);
   }
 
  public:
@@ -497,7 +502,7 @@ class DBallBound {
    * is needed.
    */
   void CalculateMidpoint(Point *centroid) const {
-    ot::InitCopy(center_, centroid);
+    ot::Copy(center_, centroid);
   }
 
   /**