This page contains documentation, write-ups and links related to the upgrade of the existing Geant 3 based infrastructure to the ROOT-based Virtual Monte Carlo simulation engine and ROOT geometry model.     VMC Virtual Monte Carlo (VMC) and Detector Description Services for STAR Brief status of the VMC project (for developers only) VMC Workshop'04 at CERN Case study: Alice VMC VMC Implementation in Alice Alice MC Event Structure Geant 3.21 code variations between Alice and STAR Track by track comparison of the Geant 3 and TGeo propagation engines VMC event structure for STAR XML Issues related to using the XML-based approach in geometry description GDML schema representation and references GDML schema compared to AGDD (Atlas) GRID Using GRID to run the STAR simulation