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Question Volumes' overlaps checking with G4PVPlacement and /geometry/test/recursive_test 

Forum: Geometry
Date: 20 Aug, 2010
From: Angela Lucaci <Angela Lucaci>

Dear all, we have a detector for which no overlaps is detected between the different volumes in case the check is done by enabling the corresponding flag in G4PVPlacement, but there is an overlap in case we use

/geometry/test/recursive_test

If we increase the radius of the detector with a few microns, then the overlap dissapears also in the latter case.

Now, I understand that the two cases use different methods to check for overlaps. But I'm not aware of the details. My question is: what is the main difference between the two methods? If the check done with G4PVPlacement does not indicate any volumes's overlaps, should I trust the result from the recursive test, or there may be some numerical instabilities?

Thank you in advance for any claryfying words, Angela

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1 More: Re: Volumes' overlaps checking with G4PVPlacement and /geometry/test/recursive_test   (Gabriele Cosmo - 27 Aug, 2010)
(_ None: Re: Volumes' overlaps checking with G4PVPlacement and /geometry/test/recursive_test   (Angela Lucaci - 27 Aug, 2010)
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