[ODE] Cylinder colisions
Russ Smith
russ at q12.org
Thu Oct 10 22:39:01 2002
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> Why don't we add the "real" cylinder class directly into ode?
the non-capped cylinder code is a good chunk of work, but i think it's
work-in-progress. there are a few current problems, especially with
cylinder-cylinder contact. the attached image illustrates the problem -
it is possible (in fact rather easy) to put two cylinders into a
configuration where the contact point (the blue box) does not even
intersect one of the cylinders. this is IMO a big error.
having said that, this cylinder work is a great step in the right
direction. even with the errors it can be useful for many people. i'll
add it to the contrib directory for now. thanks konstantin!
to explain why i think this error is a problem:
the ODE scheme of contact points/normals/depths is of course just
an approximate way of representing contact between two objects. to
reduce the approximation error, all the current contact code tries to
put the contacts somewhere inside the intersection volume, in positions
that will (a) preserve non-penetration and (b) not generate unnecessary
body motion (no extra energy allowed!). the cyl-cyl contacts often do
not meet these conditions. if you integrate cylinders into the box
stacking demo and stack them up you'll see that this error causes them
to jitter and pop way more than even the stacked boxes (which themselves
jitter because of another well understood reason). i spent a lot of time
on the current primitive-primitive collision code to prevent exactly
this sort of thing. in some cases, like the capped-cyl-to-box code,
i had to go through quite a few different schemes before i got it
(hopefully) right.
russ.
--
Russell Smith
http://www.q12.org
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--Multipart_Thu__10_Oct_2002_22:43:29_-0400_0839c960--