-----------------------------------------------------------
Pedro Paulo de M. Oliveira Junior
Diretor de Operações
Netfilter & SpeedComm Telecom
--- Novo Netfilter 3.2 www.Netfilter.com.br
--- Novo Netfilter Small Business

2009/9/30 Nick Schmansky <nicks@nmr.mgh.harvard.edu>

Tim,

Thanks for the pointer to VirtualGL, that seems like a great solution to
some of the VNC problems we have.

I've put together a wiki page describing the tksurfer 'sliver' display
problem, and potential solutions, here:

http://surfer.nmr.mgh.harvard.edu/fswiki/TksurferDisplayProblems

Thanks to everybody on the list who has contributed potential
solutions.

Nick

On Wed, 2009-09-30 at 12:12 -0400, Timothy Vickery wrote:
> I have another suggestion. When I am logged to my machine locally,
> tksurfer works but only if I enable auto-redraw AND the color scale
> bar. However, when I log in remotely (via FreeNX), I get the same
> sliver problem described here.
>
> I found a workaround, which is to use VirtualGL. If you can install
> VirtualGL on your system, then you can run tksurfer like so:
>
> /opt/VirtualGL/bin/vglrun tksurfer bert lh inflated
>
> The idea of VirtualGL is to force the hardware on the server to run
> the rendering commands, and then stream the resulting images to the
> client, rather than forcing the client to do the rendering. Thus, I
> would expect that using VirtualGL from a local session would be
> exactly the same as not using it from a local session (only slower).
> Strangely, tksurfer actually works better for me when I use VirtualGL,
> even if I am running a local session! That is, I no longer have to
> enable auto-redraw and a color scale bar to see the surface.
>
> So if you can install VirtualGL and its dependencies on your system,
> it's possible it will improve tksurfer reliability even on local
> sessions. For some reason. Note that this may impose a performance
> penalty, but it is not noticeable on my setup.
>
> -Tim
>
>
> On Wed, Sep 30, 2009 at 11:46 AM, Nick Schmansky
> <nicks@nmr.mgh.harvard.edu> wrote:
> > Abe,
> >
> > This tksurfer display problem has been a difficult one to debug, due to
> > the complexity of opengl and graphics drivers, and the lack of error
> > codes (at least that I can find).
> >
> > Sebastian mentions some possible workarounds in his email. The first
> > one to try, assuming you have an Nvidia graphics card, is to update the
> > driver. To do this:
> >
> > su root
> > /sbin/init 3
> > /usr/bin/nividia-installer --update
> >
> > (follow the instructions)
> >
> > often times this update fixes the tksurfer 'sliver' problem. outside of
> > that, you can try overriding the mesa drivers. you'll need to talk to
> > your sysadmin to do that.
> >
> > Nick
> >
> >
> > On Wed, 2009-09-30 at 05:50 -0700, Abe, Sumiko wrote:
> >> We have same problem. Any advise would be great appreciated.
> >>
> >>
> >>
> >> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >> Sumiko Abe, Ph.D
> >> Dept. of Psychiatry & Human Behavior
> >> University of California, Irvine
> >> 5251 California Dr, #204
> >> Irvine, CA 92697
> >>
> >> Tel: 1-949-824-2972
> >> E-mail: sumikoa@uci.edu
> >>
> >>
> >>
> >>
> >>
> >> ______________________________________________________________________
> >> From: freesurfer-bounces@nmr.mgh.harvard.edu
> >> [mailto:freesurfer-bounces@nmr.mgh.harvard.edu] On Behalf OfAhmed, F,
> >> Me <fahmed@sun.ac.za>
> >> Sent: Wednesday, September 30, 2009 1:31 AM
> >> To: Freesurfer Mailing List
> >> Subject: [Freesurfer] tksurfer
> >>
> >>
> >>
> >>
> >> Hello,
> >>
> >>
> >>
> >>
> >>
> >> I’m trying to view and check the smoothing and inflation surfaces, the
> >> white and pial surfaces for “bert” using tksurfer as I’m trying to get
> >> used to using Freesurfer, but I’m a little confused to what I’m
> >> seeing. When I type in: “tksurfer bert lh inflated” for example, I
> >> only see a very small section at the very end of the image…is this
> >> correct? When I view the curv files, I do see a green pattern overlaid
> >> on the inflated surface, however it’s still so small. When I view the
> >> pial and white surfaces, again, the section displayed is very small, I
> >> don’t know if this is correct or if this is what I am supposed to be
> >> seeing? Also, when I type in: “tksurfer bert lh sphere”, I see nothing
> >> at all.
> >>
> >>
> >>
> >>
> >>
> >> If someone could shed some light on the matter I’d be extremely
> >> grateful.
> >>
> >>
> >>
> >>
> >>
> >> Thank you
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
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