Hi, Currently in TNode.h there is the declaration & definition for the method to change a TNode's parent, e.g.: virtual void SetParent(TNode *parent) {fParent=parent;} But this does only half the work necessary. The parent losing the custody battle is never informed and continues to think they have this child. I think the right code is: void TNode::SetParent(TNode *parent) { // set the pointer to the parent, keep parents informed about who they have if (fParent) fParent->GetListOfNodes()->Remove(this); else gGeometry->GetListOfNodes()->Remove(this); fParent = parent; if (fParent) { fParent->BuildListOfNodes(); // new parent might not have list fParent->GetListOfNodes()->Add(this); } else gGeometry->GetListOfNodes()->Add(this); } Could this be the distributed definition? There are times when building a geometry it's easier to build a "containee" node before one builds the "container" node and then after the fact make the right adjustments. Thanks, -robert Robert W. Hatcher | rhatcher@slac.stanford.edu Research Associate | 650.926.3171 [FAX 4001 or 3587] Stanford University | PO Box 4349, MS #63, Stanford CA 94309
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