Object Model to Construct the Mixed "Open Inventor™ " / ROOT 3D Scenes

This paper presents an OO model and its implementation, allowing for the creation of OO definitions of complex 3D scenes based on Open Inventor™[1] and ROOT 3D object models simultaneously. Such approach allows us to create the unified visualization software layer to fulfil the different, sometimes contradicting, requirements for Detector Simulation, Event reconstruction and Online Monitoring that could not be otherwise satisfied with existing packages. The object built upon this model can be saved and retrieved using either ROOT (ROOT macro, ROOT files) or Open Inventor ™ ("iv " or "vrml " format files) I/O. They can be rendered with the built-in ROOT TVirtualViewer3D plug-in and with the OpenInventor™-based implementation. To reveal the OpenInventor ™ components, a dedicated plug-in was developed. The plug-in and working examples are available as a part of QtRoot project and available for download fro