Hi roottalk, I would like to write a class that inherits from TGeoNode and place nodes of this derived class in my constructed geometry volumes. I'm having trouble in that there is no TGeoVolume::AddNode method to support adding a preexisting node to a volume, e.g. there is no AddNode method of the form: TGeoVolume::AddNode(const TGeoNode* node) I'm wondering if its possible to add support for this. My second request is that I'd like to have the TVirtualMC methods which configure the MC: virtual void SetCut(const char* cutName, Double_t cutValue) = 0; virtual void SetProcess(const char* flagName, Int_t flagValue) = 0; return a value which indicates a success or failure for the setting of the requested flag/cut. This would allow the caller to take appropriate action if there is failure. Thanks for your help, -Sue
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