code: protected void afterAddInstance(KDTreeNode node) {
      node.m_Start++;
      node.m_End++;
      if (!node.isALeaf()) {
        afterAddInstance(node.m_Left);
        afterAddInstance(node.m_Right);
      }
    }
docs: Corrects the start and end indices of a
  KDTreeNode after an instance is added to
  the tree. The start and end indices for
  the master index array (m_InstList)
  stored in the nodes need to be updated
  for all nodes in the subtree on the
  right of a node where the instance
  was added.
  NOTE: No outside class should call this
  method.
  
  @param node KDTreeNode whose start and end indices
  need to be updated.