Good day,

I get the error below when running MRIcroGL. I cannot seem to track down any information related to this error.

This is a physical system
CentOS7.4
Kernel driver in use: nvidia
Kernel modules: nouveau, nvidia_drm, nvidia
NVIDIA Corporation GP108 [GeForce GT 1030]

user@localhost ~]$ /usr/local/mricrogl_lx/MRIcroGL
[FORMS.PP] ExceptionOccurred
Sender=Exception
Exception=gdk_gl_context_share_new_usefpglx no visual found
Stack trace:
$000000000071F6D0
$000000000071F48F
$000000000071F432
$000000000071FDB6
$000000000071FFE0
$000000000071ECE0
$000000000062139A
$0000000000620AAE
$00000000006221E7
$0000000000621662
$0000000000526A24
$000000000052E43D
$000000000052F736
$0000000000620AAE
$00000000006221E7
$000000000053716F
TApplication.HandleException gdk_gl_context_share_new_usefpglx no visual found
Stack trace:
$000000000071F6D0
$000000000071F48F
$000000000071F432
$000000000071FDB6
$000000000071FFE0
$000000000071ECE0
$000000000062139A
$0000000000620AAE
$00000000006221E7
$0000000000621662
$0000000000526A24
$000000000052E43D
$000000000052F736
$0000000000620AAE
$00000000006221E7
$000000000053716F

First of all, I would make sure you downloaded the latest release. Details for installation of MRIcroGL are in the Wiki. It links to the troubleshooting page that describes your issue. You will need hardware that supports OpenGL 2.1 (released in 2006). You can check your OpenGL support with the command line tool glxinfo. Note that a (crippled) version of FSLeyes runs using OpenGL 1.4. So that might be your best bet if you do not have a modern graphics card. You can also use MRIcron which does not require OpenGL at all, though note that it can not provide interactive volume rendering.