[ODE] Drawstuff memory problem on OS X

[thibodea at cs.umass.edu]

Hi -

drawCylinder() in drawstuff.cpp is creating a memory leak on my OS X machine 
(10.4.2).  It seems that any program that calls dsDrawCylinder(), including the 
test programs built by ode (though I didn't exhaustively check them all) will 
take up more and more memory as it runs.  My simulation takes about 90M of VM if 
I don't draw cylinders, but will climb to over 400M of VM in a minute or so if I 
am drawing 2 cylinders per time step.  I tested both the CVS version and the 0.5 
release and found the same problems.  I was able to work around the problem 
using gluCylinder() and gluDisk() inside of dsDrawCylinder() instead of 
drawCylinder(). 

I don't know enough about OpenGL to figure out why the the original drawCylinder
() is causing problems on OS X.  Also, I couldn't reproduce the problem on a 
linux machine.  I don't know how many people actually use the drawstuff 
libraries, but this problem does keep some of the example programs from running 
smoothly on OS X for any length of time.

If anyone can suggest a potential fix, or suggest why the original function is 
problematic on OS X, I'll try to debug the original function if I get a chance.  
It is also possible that other functions in drawstuff also cause the same 
problem, but I haven't gone through and tested them all.  The dsDrawBox() 
function seems to work OK.

Bryan

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