Didier Laporte (Centre National de la Recherche Scientifique (FR))
Obtaining accurate and quick estimates of the amount of material represented by a detector is essential in the design phase, especially for tracking detectors. It allows the designers to have a quick feed-back of the effect of the design choices on important aspects of the physics performance. The best available information on the detector geometry is the 3D CAD mockup. We will show through several examples (IBL, ITK, ID services, and also LArg calorimeter) how the 3D CAD mockup can be used efficiently to produce this information under Catia , by using a Visual basic macro able to access the geometrical information inside Catia. The presentation will cover the internal logic of the macro, the preparation of the CAD mockup for adequate analysis. Results obtained will be shown and discussed, including limitations on amount of information that can be extracted.