[ODE] 2d system

david@csworkbench.com david at csworkbench.com
Tue Apr 1 14:52:02 2003


Don't you mean 1/30 ? :)

>       __GUARANTEED__
>
> And it will be called "O2DE".
> With an irrational version number of 1/300.
> This places it slightly behind the current ODE in functionality.
> Except for the included iterative solver.
>
>    - John DeWeese             (An April fool :)
>
> On Tuesday, April 1, 2003, at 12:16 PM, <david@csworkbench.com> wrote:
>
>> I don't know about "guaranteed" to be easier than ODE to implement.
>> Sure,
>> there's a few less possible joints since there's only 3 degrees of
>> freedom, but all the rest of the internal work would still be the
>> same, just on a smaller (and therefore more efficient) matrix.  That
>> is  assuming
>> you took the same approach at the problem as ODE does.  The only thing
>>  you
>> wouldn't need to implement would be amotors and ball joints, and maybe
>> hinge2's.  But you'd probably want to keep hinge2's in there and
>> convert
>> the turning axis to a suspension slider only.
>>
>> David
>>
>>> This question popped up on the list a few weeks ago and fizzled out
>>> quickly (DOH).
>>>
>>> http://q12.org/pipermail/ode/2003-March/003616.html
>>>
>>> and the replies...
>>> http://q12.org/pipermail/ode/2003-March/003619.html
>>> http://q12.org/pipermail/ode/2003-March/003620.html
>>>
>>> I haven't been able to find any 2D rigid-body physics software. Seems
>>> that most people who want 2D physics have just written their own
>>> spring-mass system with cross bars and funny integrators for
>>> stability.
>>> Let me know if you find any though.
>>>
>>> Anyway, it wouldn't make much sense to insert 2D functionality into
>>> ODE
>>> as it currently stands. You'd be better off reimplementing the API in
>>>  a
>>> 2D-like fashion, and seeing if you can pull in the solver and other
>>> guts
>>>  as well. On the bright side, it's GUARANTEED to be easier than ODE
>>> to
>>> implement!
>>>
>>> I am interested in assisting if you pick up that challenge.
>>>
>>> Christopher Jefferson wrote:
>>>> Hi!
>>>> I would like to use ODE in a 2 dimensional system. I notice from the
>>>> documentation that 2d is mentioned in the changelog but can't find
>>>> it anywhere else. To simple get me started I decided to try using
>>>> spheres
>>>> and cubes and set the co-ordinates appropriately. This does work at
>>>> first but unsurprisingly it slowly drifts into the third dimension.
>>>> I can keep forcing things back into 2d but I was wondering if there
>>>> is  a
>>>> better way to do this?
>>>> Chris
>
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