[ODE] iterative solver: testing needed

[david@csworkbench.com]

Doh!  I knew I'd miss one of those.  <goes off grumbling something about
Microsoft, Bill Gates, and the Antichrist>

David

>
> Small problem compiling the test on MS VC:
>
> ode/test/test_crash.cpp(205) : error C2086: 'i' : redefinition
>
> simply remove "int i" at line 172.
> --
> gl
>
>
> ----- Original Message -----
> From: <david@csworkbench.com>
> To: <ode@q12.org>
> Sent: Friday, March 28, 2003 3:32 PM
> Subject: [ODE] iterative solver: testing needed
>
>
>> Well guys, I need some help finding out why my car is spinning when it
>> stops in the iterative solver, so I'm releasing it for y'all to play
>> with.
>>  If you can help me define exactly what causes it, maybe I can track
>> down
>> my bug.  I think it has something to do with the contact constraint,
>> but I've tried all kinds of friction and slip parameters with both the
>> LCP and my simpler solver (there's a define at the top of stepfast.cpp
>> -- FAST_FACTOR or SLOW_LCP).  And I just can't seem to find anything
>> that makes it not spin (intuitively, the last thing I changed is what
>> would have caused it....)  So y'all give it a whirl and throw some
>> ideas at me.
>>
>> http://www.csworkbench.com/stepfast.zip
>>
>> Place that in the ode directory and extract it.  It will replace your
>> Makefile, Makefile.deps, and ode/include/objects.h files, as well as
>> placing the stepfast.h/cpp in the ode/src directory.  Then running
>> make should compile it in.  I've also put the test file I've been
>> using (test_crash.cpp) in the ode/test directory.  You'll notice lots
>> of defines at the top.  You can change ROWS and COLS to a higher
>> number to make the army of cars, and uncomment #define WALL to add the
>> box wall to the simulation.  ITERS is the number of iterations per
>> step.  You can press 'f' during the simulation to switch back and
>> forth between the iterative solver and the old solver.  The green/red
>> ball in the sky tells you which one you're using currently
>> (green=iterative, red=old).
>>
>> So, play around with it, see if you can help me find my bug.  (Or just
>> play around with it :)  I'll continue testing and work on some
>> documentation.  If you want to use the iterative solver in a current
>> program of yours, just change:
>> dWorldStep(world, timestep);
>> to
>> dWorldStepFast(world, timestep, iterations);
>> 5 seems to be a generally good start for the number of iterations in
>> the tests I've run.  But more complex systems may need a higher
>> number.
>>
>> Thanks for the help,
>> David Whittaker
>>
>>
>> _______________________________________________
>> ODE mailing list
>> ODE@q12.org
>> http://q12.org/mailman/listinfo/ode