At least in my testing, the 3D window managers in Ubuntu 14.04 (Unity) 
and RHEL 7 (Gnome 3.8.x) now work when you use the latest pre-releases 
of VirtualGL (2.4 post-beta: 
http://www.virtualgl.org/DeveloperInfo/PreReleases) and TurboVNC (2.0 
evolving: http://www.turbovnc.org/DeveloperInfo/PreReleases).

Pass an argument of -3dwm to /opt/TurboVNC/bin/vncserver when starting 
TurboVNC in order to activate 3D window manager support (all this really 
does is run the xstartup.turbovnc file with 'vglrun +wm'.  You can 
achieve the same thing less automatically with other X proxies, if you 
choose.)

Be sure to delete ~/.vnc/xstartup.turbovnc and let vncserver create a 
new one for you, because there are some fixes in xstartup.turbovnc that 
are necessary to make Unity start properly under Ubuntu 14.04. 
Specifically, the new xstartup.turbovnc will automatically launch the 
gnome-fallback session if 3D window manager support isn't activated, and 
it will launch Unity otherwise.

Using -3dwm also allows you to run older versions of Gnome (for 
instance, the one that ships with RHEL 6) with desktop effects enabled.

As a side effect, running a 3D window manager in this way allows you to 
launch 3D applications without using vglrun.  I don't consider this a 
"feature", though.  It's actually more of a bug, because there are 
likely some hidden issues that will spring up because of it-- certain 
non-3D applications that won't enjoy having VirtualGL preloaded into 
them.  I don't know of a way around it at the moment, though, so please 
do your own testing and file a bug report or post a message to 
VirtualGL-Users if you encounter any issues.

DRC

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