[ODE] quadratic planes

[Benoit Forestier]

Hello,
firstly, i would like to apologize for my poor english.
I would like to simulate  the motion (and collisions) of spheres within an
empty cylinder.
from what i saw in the user guide, there is no geom type i can use to
perform that kind of calculation. 
has anybody heard about any quadratic plane geom class (i.e. a plane with
equation of the form ax^2 + by^2 + cz^2 + dxy + exz + fyz + gx + hy + iz + j
= 0)? 
should i  build my own class?
is there any other way to model a cylindrical vessel?
Thanks
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