Some volumes break GEANT visualization

[gaponenko]

I can look at some parts of the Mu2e setup using the GEANT Qt visualization, but not others. I do not know if there is a problem
with the PS enclosure geometry, or it is a bug in the visualization code we use.

Steps to reproduce:

1. Build Mu2e Offline with Qt visualization enabled: "muse setup -q qt:st; muse build". I use the current HEAD, git commit ea9030b

2. Create a test job config file in the top level muse directory:
   cat > vistest.fcl <<EOF
   #include "Offline/Mu2eG4/fcl/g4test_stage0ST.fcl"
   services.GeometryService.inputFile: "geom_vistest.txt"
   physics.producers.g4run.physics.physicsListName: "Minimal" # for faster load
   physics.producers.g4run.visualization.initMacro: "Offline/Mu2eG4/vis/vismqt.mac"
   physics.producers.g4run.visualization.GUIMacro: "Offline/Mu2eG4/vis/visqtGUI.mac"
   EOF

3. Create a test geometry file with visibility of most volumes turned off
   cat > geom_vistest.txt <<EOF
   #include "Offline/Mu2eG4/geom/geom_common.txt"
   bool g4.visible = false;
   vector g4.visible.order = { "g4.visible.drop", "g4.visible.keep" };
   vector g4.visible.drop = { "*" };
   vector g4.visible.keep = { "PSShield" };
   //vector g4.visible.keep = { "psEnclosure" };
   EOF

4. Run the job as is to make sure you can visualize the HRS: "mu2e -c vistest.fcl -n1", type "g" to enter the GUI session, click on the "Start Here"|"Start by clicking Here Once" menu entry.

5. Comment out the PSShield line in geom_vistest.txt and uncomment the psEnclosure line. Repeat the GUI session, and observe the breakage.

[resnegfk]

I can confirm the behavior.

A small correction for the simple config file (vector needs the string parameter here) so, 3 above should read

cat > geom_vistest.txt <<EOF
#include "Offline/Mu2eG4/geom/geom_common.txt"
bool g4.visible = false;
vector g4.visible.order = { "g4.visible.drop", "g4.visible.keep" };
vector g4.visible.drop = { "*" };
vector g4.visible.keep = { "PSShield" };
//vector g4.visible.keep = { "psEnclosure" };
EOF

In 4 it may be useful to first click/select the "Scene Tree" tab before clicking "Start Here"

The, now quite old note: old note https://mu2e-docdb.fnal.gov/cgi-bin/sso/ShowDocument?docid=3680 has still some valid hints on Qt

Perhaps a check with other tools like TEve could shed some light here, although the gdml file seems valid, but perhaps has some constructs which the vis tool cannot handle.