First look at a quick review of why volume overlaps matter in GEANT.
I created a simple GEANT example to test Gverify's accuracy. The system consists of a box which contains two trapezoids and two boxes. Each trapezoid contains two boxes which overlap. Gverify easily discovers the box overlaps, but finds a bogus overlap between one of the trapezoids and a box. The TopDrawer plots illustrate this clearly (the raw points are here).
I believe Gverify has a bug or two in its handling of TRAP shapes (perhaps in the GVOLS subpackage). BOXes seem to be OK, though.
Or this example of a daughter extending outside the mother, graphically shown in this projection. I'm not quite sure why the L0CJ daughter has a rotation around the Z axis. L0CJ also extends beyond L00C in z as well as radially.
Unfortunately Gverify complains a lot about the snout, which is made of a lot of TRAP volumes (which Gverify doesn't handle correctly).
I have here a partial list of the
daughters which stick outside their
Here is a partial list of
daughters which intersect.
Here is a partial list of daughters which intersect.
List of Gverify summaries and details: (note that if there aren't any bad volumes, the details will be missing) All jobs have now finished running as of 5-Feb-2004, and the list is complete.
Modified 5-February-2004 at 8:54
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