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Forum: Geometry
Re: Question G4ThreeVector - y value is not being read correctly
Date: 12 Jan, 2017
From: <php1ic>

Hi John and John,

Thanks for the responses, but I think this may be a visualisation issue when working over my remote connection, why it only affects the y-direction I have no idea.

For context, I have geant4 installed on a fully updated debian stable (8.6 x64), built with the following:

-DCMAKE_BUILD_TYPE=RelWithDebInfo -DGEANT4_BUILD_MULTITHREADED=ON -DGEANT4_USE_QT=ON -DGEANT4_USE_OPENGL_X11=ON -DGEANT4_USE_GDML=ON -DGEANT4_USE_RAYTRACER_X11=ON

There is also a vncserver running and I connect to the debian system using VNCviewer from a windows 10 machine.

The attached screenshot (VNC_visualisation.png) highlights the issue. With the previously given G4ThreeVector position, the cone should be sticking out the top of the envelope, as can be seen it doesn't. I have also fired a geantino which appears to pass through the cone (Shape1), but from the track output on the left you can see that it does not.

To test I created a VM with debian and installed geant4 v10.3 with the same cmake options and alterations to B1. The other attachment (Normal_visualisation.png) shows the cone in the correct position.

It looks like the y-value is being correctly read, but my setup has a visualisation issue. I don't get this with 10.2.2 so will probably revert to that version for the moment.

I'm happy to provide more detail if anyone requires, but I think we can conclude that this is not an issue with G4ThreeVector.

Thanks again.

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/01/12/06.12-75717-Normal_visualisation.png
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/01/12/06.12-35161-VNC_visualisation.png

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