Problem 1687

Summary:	Spurious warnings about valid "overlap with mother volume"
Product:	Geant4	Reporter:	Amnon Harel <harelamnon>
Component:	geometry/volumes	Assignee:	Gabriele Cosmo <Gabriele.Cosmo>
Status:	RESOLVED INVALID
Severity:	minor
Priority:	P5
Version:	10.0
Hardware:	All
OS:	All

Description Amnon Harel 2014-11-05 16:18:18 CET

When checking for overlaps during construction of a detector geometry, spurious warning messages about "Overlap with mother value" are issued. But from 
http://geant4.web.cern.ch/geant4/G4UsersDocuments/UsersGuides/ForApplicationDeveloper/html/Detector/geomOverlap.html
it is clear that such overlaps are perfectly valid.

An "Information" message would be legitimate here.

This issue was discussed in 
http://hypernews.slac.stanford.edu/HyperNews/geant4/get/geometry/980/1.html
and I believe their suggestion of offering a verbosity level that disables these messages is a good one, precisely for the reasoning given back then.

However, this is independent of the wrong categorization of these messages.

Comment 1 Gabriele Cosmo 2014-11-05 17:29:04 CET

Could you please provide a simple test case which reproduces the problem you're having?
There should not be spurious warnings in the way overlaps are computed in the new release; if reported, they're likely real, or we need to understand why false reports are given.

It is possible already to turn off verbosity of the overlaps-checking and tune precision in order to exclude messages from tiny overlaps for debug purposes, as reported in the documentation.