|Message: Re: Hole in a conical section||Not Logged In (login)|
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In case you need(ed) additional information, I had some additional suggestions and comments: On Nov 24, 2009, John Allison wrote: > To see graphics that relies only on tracking, use RayTracer(X). I strongly urge you to use this visualisation option, to double check your geometry. It uses the exact geometry description you have created to track the rays. Due to this it can diagnose issues in a geometry which cannot be seen otherwise. (The visualisation simplifies the geometry in all cases, and has a difficult task in the case of boolean solids.) On Nov 23, 2009, Estela Suarez wrote: > When I put my detector in the hole and fire it with many particles I > don't get any segmentation violation, which I > think would be the case if I would have volumes superimposed. Only occasionally will an overlap cause a segmentation fault. Typically the behaviour is just not well define - e.g. locating the volume for a position which is in an overlap region can depend on the state of the navigator before that call. For boolean solids (and other challenging shapes) the best ways to ensure that the geometry is well described, and that overlaps are not occurring are: - to use the newest overlap detection method (add a parameter at the end of the G4PVPlacement constructor to check whether a volume overlaps when you define it - see the documentation for details); - visualise it using the RayTracer (as above); - set the Check Mode when tracking (both for the RayTracer and for particles in your simulation) by using the commands /geometry/navigator/check_mode true This will do extra checks during the navigation, and report any problems which it finds. It is not guaranteed to find any and all problems, but does try to report all the potential issues it finds and the additional checking should not be a large overhead. For more information, in case you find a likely problem you can use an additional flag during the debugging of your geometry that will give additional information as it does this checking: /geometry/navigator/verbose 1 I hope that these suggestions can enable you to verify your geometry. Best regards, John Apostolakis
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