This looks like a bug in gl-world. gl-world fails to specify the style 'gl to the canvas% constructor. See: <a href="http://docs.racket-lang.org/gui/canvas_.html?q=canvas">http://docs.racket-lang.org/gui/canvas_.html?q=canvas</a> I guess Jay is using a platform on which it happens to work without style 'gl. Stephan <div class="gmail_quote">2012/5/18 JP Verkamp <<a href="mailto:racket@jverkamp.com" target="_blank">racket@jverkamp.com</a>> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Interesting. Taking away the gl-world code and using the code to create a canvas% with a gl-context from here ( <a href="http://lists.racket-lang.org/users/archive/attachments/20100118/4272caa0/attachment-0001.ksh" target="_blank">http://lists.racket-lang.org/users/archive/attachments/20100118/4272caa0/attachment-0001.ksh</a> ) works just fine (albeit slowly, I need to get the OpenGL drivers working correctly again). Perhaps I'm using gl-world incorrectly. It would still be helpful if there was a way to get a better error message to tell me what was going wrong though. <div class="HOEnZb"><div class="h5"> On Thu, May 17, 2012 at 6:09 PM, JP Verkamp <<a href="mailto:racket@jverkamp.com">racket@jverkamp.com</a>> wrote: > For whatever reason I don't have that directory. I ran this version instead: > <a href="https://raw.github.com/plt/racket/master/collects/sgl/examples/gears.rkt" target="_blank">https://raw.github.com/plt/racket/master/collects/sgl/examples/gears.rkt</a> > > That worked fine, rotating the gears as expected and printing this to > the console: > RENDERER: Mesa DRI Intel(R) 945GM x86/MMX/SSE2 > VERSION: 1.4 Mesa 8.0.2 > VENDOR: Tungsten Graphics, Inc > EXTENSIONS: ... > > If it helps, I'm using Ubuntu 12.04 which either didn't have Racket or > at least not a newer version, so I'm installing from this PPA: > deb <a href="http://ppa.launchpad.net/plt/racket/ubuntu" target="_blank">http://ppa.launchpad.net/plt/racket/ubuntu</a> precise main > > On Thu, May 17, 2012 at 4:58 PM, Michael Wilber <<a href="mailto:mwilber@uccs.edu">mwilber@uccs.edu</a>> wrote: >> Can you run other OpenGL Racket programs? For example, try the gears example: >> >> racket /usr/lib/racket/collects/sgl/examples/gears.rkt >> >> On Thu, 17 May 2012 17:49:21 -0400, JP Verkamp <<a href="mailto:racket@jverkamp.com">racket@jverkamp.com</a>> wrote: >>> Hopefully someone out there can help me out, I've run into a a bit of >>> a problem with the gl2d and gl-world packages from PLaneT. I've got a >>> relatively small sample and whenever I run the code (even after >>> commenting out all of the OpenGL specific code other than the big-bang >>> call), I always get this error: >>> >>> send: target is not an object: #f for method: call-as-current >>> >>> The one relevant response I've found thus far on the subject is from >>> Matthew Flatt from last December on the mailing list ( >>> <a href="http://lists.racket-lang.org/users/archive/2011-October/048813.html" target="_blank">http://lists.racket-lang.org/users/archive/2011-October/048813.html</a> ) >>> which says to check "Do you have "libgdkglext-x11-1.0" and >>> "libgtkglext-x11-1.0" installed?", which I do. There's a .so for each >>> in my /usr/lib directory. After that though, I'm not sure where to go. >>> Is there perhaps some way to check which libraries that Racket is >>> trying to load / what else might be causing the error? >>> >>> Thanks, >>> JP >>> ____________________ >>> Racket Users list: >>> <a href="http://lists.racket-lang.org/users" target="_blank">http://lists.racket-lang.org/users</a> ____________________ Racket Users list: <a href="http://lists.racket-lang.org/users" target="_blank">http://lists.racket-lang.org/users</a> </div></div></blockquote></div>