OpenGL Visualization Issues

Recording, Visualizing and Persisting Data
1

Hi All,
I am having issues using OpenGL for interactive visualization of detector geometry. I have no issues using RayTracer, DAWNFILE, etc., but I am not able to use any interactive GUIs (I would like to use OGLIX).

I am using Geant4.10.06 on a server running SLC7. For downloading Geant, I used the directions here: http://geant4-userdoc.web.cern.ch/geant4-userdoc/UsersGuides/InstallationGuide/html/installguide.html

In addition to those directions, I have ensured that I have the environment variables G4VIS_BUILD_OPENGLX_DRIVER and G4_VIS_USE_OPENGLX set correctly during my build. Despite this, I don’t think the OpenGL visualization driver is getting built properly and it is definitely not accessible from with Geant.

I am able to see GUIs from other programs (for example, ROOT), so I believe this is an issue with the way Geant is built on my system or a problem with one of the drivers.

I would really appreciate any suggestions or help you all could provide!

Cheers,
Stephen

2

Hi Stephen

Building: Using cmake?: You need to specify GEANT4_USE_OPENGL_X11 with the -D option. Can you confirm that you are doing this?

Running: the environment variables you mention are no longer required.

Running over the network: Are you using ssh -X (or better, ssh -Y)? And is GLX enabled on your local X11?

Let us know if this helps.

John

3

Hi John,
Thanks so much for your help. I am using ssh -Y, but I was not previously using the -DGEANT4_USE_OPENGL_X11 option when building with cmake.

Using this options with cmake gives the following error after executing the make command:

fatal error: GL/gl.h: No such file or directory.

As simple as this issue is, I’m not sure I know enough about OpenGL to fix it. Please let me know if you have any suggestions about how I can fix it.

Thanks again,
Stephen

4

Did you rebuild from scratch? I think that should fix it.

5

Or maybe OpenGL is not installed on your server. Could you consult your system manager? What operating system does it use?

6

I rebuilt from scratch, and this did not solve the issue.

I checked with the system manager, and OpenGL is installed on the server.
I added find_package(OpenGL REQUIRED)
to the main CMakeLists.txt file and it finds it ok. Perhaps there is something else I need to add to this file?

7

Which “main CMakeLists.txt” did you add the find_package to? Could you please post the output from:

  1. Running CMake to build Geant4 itself, including the command line you used
  2. Running CMake to build your application, including the command line you used
8

I think I have solved the issue.

I am using conda enviornment manager, so I the "#include " directive was searching by default only within my conda enviornment. I added a link to the system GL directory inside by conda directory, and this solved the issue.

Thanks for your help!

9

Actually, it seems like OGLIX is still not listed in the candidate list for visualization, despite building with the -DGEANT4_USE_OPENGL_X11=ON option, and having no errors building or installing.

Any idea what could be the issue?