[ODE] QuickStep comparison to Tokamak - large-scale stacking

[Megan Fox]

That test is using the standard 1 unit = 1 meter scale, with boxes that are
1x1x1.

Heck, it's right here -
http://shalinor.circustent.us/elium/builds/PhysDemo.zip - if anyone wants to
fiddle with it.  Powered by Nebula 2, etc etc, blah - if it crashes, you're
one of the small minority that has that problem with my builds (no idea why,
I'm overdue for a WinXP reinstall anyways).


Boxes that are 1/2 meter cubed shouldn't be any more or less stable in a
properly-behaving sim, though - and they certainly aren't in Tokamak, not
sure in ODE as I've only ever used 1x1x1's.

-Megan Fox


> Hi Ed,
>
> EJ> Where I am -9.80665 is normal!
> EJ> ;)
>
>     ;)
>     But if you apply -9.8 gravity in test_boxstack.cpp you'll make ODE
>     much more unstable because such value is too large for,say, a
>     0.5*0.5*0.5 box, So i you drop a box from 5 (m) into a box in the
>     ground,you'll notice very deep penetration.
>     So I just afraid that people use geoms like common ODE sample but
>     with very high gravity(you could see in test_boxstack.cpp, gravity
>     is -0.5).
>
>     Actually, we should take special care to units in physics to avoid
>     numerical problem.
>
> --
> Best regards,
>
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