|Message: Major tracking bug in G4ExtrudedSolid||Not Logged In (login)|
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Suddenly one of my regression tests is failing. It uses a G4ExtrudedSolid
combined with a UserSteppingAction that kills any track that enters the
physical volume of the solid. The error is that SOME of the tracks that enter
the physical volume are not killed, causing my regression test to fail. SteppingVerbose
shows that these tracks never enter the physical volume -- they have steps that
are manifestly inside it, but the steps are in volume "World". Other tracks
are killed properly at the front face of the physical volume. The extrusion is
the only volume in the World, and is displayed correctly in Open Inventor.
This fails in Geant4 version Name: geant4-10-00-patch-02 (13-June-2014)
This works in Geant4 version Name: geant4-09-06-patch-02 (17-May-2013)
This is Mac OS X 10.9.5 (Mavericks). I've checked, and am pretty sure that no relevant G4beamline code changed between those two versions.
Attached is a screen shot of the Open Inventor viewer, looking from downstream of the extrusion toward the rectangular source of the blue beam tracks (the viewer is tilted slightly so the tracks are visible). All beam tracks are parallel to Z. The extrusion is red, and the tracks that hit its triangle in the upper left are not killed, but those in the rest of the extrusion are killed properly (hence not visible). Tracks that miss the extrusion are visible.
The vertices of the extrusion are: 50,50; 350,50; 350,350; 250,350; 250,250; 150,250; 100,350; 50,250; This is G4beamline, in which this sort of test is easy; it will take me a while to construct a pure Geant4 test case. Note that G4beamline automatically reverses the order of vertices if it is wrong. In the image, (x=0,y=0) is in the lower left, with X increasing to the right, Y increasing up, and Z out of the page.
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