[vtkusers] Re: Offscreen Rendering

[Randy Heiland]

It's *running* your pgm remotely that's the problem, not *compiling* remotely.

Try the following things:

where:
R=remote computer you're telneted in from
H=host computer running the pgm

1) from R do a 'xhost +<name of H>', e.g., 'xhost +marvin',
    then try to run

if that still fails:
2) from H, insert your pgm into a script which exports the DISPLAY env var,
e.g.

run.sh:
-------
DISPLAY=:0.0
export DISPLAY
dispPgm

then execute 'run.sh'

if that still fails:
3)  change the line in the code to be this:

      this->DisplayId = XOpenDisplay((char *)NULL);

recompile the class, your pgm, and iterate on 1) and 2) til you're exhausted :)

Oh yeah, also do a 'man XOpenDisplay' and read it.

good luck,
--Randy


On Oct 3, 11:45am, Miguel Angel Martin Fernandez wrote:
> Subject: [vtkusers] Re: Offscreen Rendering
> Hi vtkusers!
>
> I am having a problem with vtkOpenGLOffscreenRenderWindow, sometimes when
> I compile (on a remote host using telnet) a program that uses it, i get
> the following error as i try to run my program:
>
>
> Xlib: connection to ":0.0" refused by server Xlib: Invalid
> MIT-MAGIC-COOKIE-1 key
>
> ERROR: In vtkOpenGLOffscreenRenderWindow.cxx, line 683
> vtkOpenGLOffscreenRenderWindow (0x807f478): bad X server connection.
>
> p1_27512:  p4_error: interrupt SIGSEGV: 11 rm_l_1_27513:  p4_error:
> interrupt SIGINT: 2 p0_22175: (2.142237) Trying to receive a message when
> there are no connections; Bailing out
>
>
> The cxx code line involved in this error is:
>
>   if (!this->DisplayId) {
>     this->DisplayId = XOpenDisplay(":0");
>     if (this->DisplayId == NULL) {
>       vtkErrorMacro(<< "bad X server connection.\n");
>     }
>
>
>
> However, if I compile the program while I am fisically in front of the
> computer (not using telnet) then everything works OK, and  i don't get any
> erorrs even if i then run it using telnet.
>
> Maybe when I am actually sitting by the computer, then this->DisplayId
> does exist, and therefore it doesn't enter that "if"??
>
> Any ideas on how to fix this without having to run around the lab will be
> definitely welcome!!!
>
>
> Thank you very much in advance
>
>
> 			Diego Hernando
>
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>-- End of excerpt from Miguel Angel Martin Fernandez