[ODE] Wheels bending ;-)
kaffiene
kaffiene at xtra.co.nz
Sun Jun 2 02:59:02 2002
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Hi - I posted this and got no replies, so I'm asking again =3D)
p.s. should the axis passed into dBodySetFiniteRotationAxis be the =
swiftly rotating axis in model space or word space? (I was using model =
space)
Cheers,
Peter.
----- Original Message -----=20
From: kaffiene=20
To: ODE List=20
Sent: Friday, May 31, 2002 8:59 PM
Subject: [ODE] Wheels bending ;-)
Hi All,
I've come across a problem which seems to be mentioned in the docs =
(section 11.9) - the problem of wheels on a car moving out of alignment =
under fast rotations.
I've applied the recommended fix (dBodySetFiniteRotationMode(<each =
wheel body.>, 1) when bodies are created, and =
dBodySetFiniteRotationAxis(<each wheel body>, 0, 1, 0) before or after =
each time step of the simulation) but it doesn't seem to work. When I =
use the setFiniteRotationAxis with axis y as above, I cannot steer my =
car at all!=20
Anyone come accross this before? Any ideas?
p.s. I have tried using dBodySetFiniteRotationAxis(<each wheel body>, =
0, 0, 0) and dBodySetFiniteRotationAxis(<each wheel body>, 0, 0, 1) =
(it's a hinge2 joint with z and y axis, but I'm pretty sure that the z =
axis is *not* the one the wheel rotates about). Neither of those =
approaches fixes the original problem, but I can at least steer =3D)
Help! =3D)
Thanks in advance for any ideas.
Peter.
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<DIV><FONT face=3DArial size=3D2>Hi - I posted this and got no replies, =
so I'm=20
asking again =3D)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>p.s. should the axis passed=20
into dBodySetFiniteRotationAxis be the swiftly rotating axis in =
model space=20
or word space? (I was using model space)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Cheers,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Peter.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dkaffiene@xtra.co.nz =
href=3D"mailto:kaffiene@xtra.co.nz">kaffiene</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A title=3Dode@q12.org=20
href=3D"mailto:ode@q12.org">ODE List</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Friday, May 31, 2002 8:59 =
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [ODE] Wheels bending =
;-)</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>Hi All,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>I've come across a problem which =
seems to be=20
mentioned in the docs (section 11.9) - the problem of wheels on a car =
moving=20
out of alignment under fast rotations.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>I've applied the recommended fix=20
(dBodySetFiniteRotationMode(<each wheel body.>, 1) when bodies =
are=20
created, and dBodySetFiniteRotationAxis(<each wheel body>, 0, 1, =
0)=20
before or after each time step of the simulation) but it doesn't seem =
to=20
work. When I use the setFiniteRotationAxis with axis y as above, =
I=20
cannot steer my car at all! </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Anyone come accross this =
before? Any=20
ideas?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>p.s. I have tried using=20
dBodySetFiniteRotationAxis(<each wheel body>, 0, 0, 0) and=20
dBodySetFiniteRotationAxis(<each wheel body>, 0, 0, 1) (it's a =
hinge2=20
joint with z and y axis, but I'm pretty sure that the z axis is *not* =
the one=20
the wheel rotates about). Neither of those approaches fixes the =
original=20
problem, but I can at least steer =3D)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Help! =3D)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Thanks in advance for any =
ideas.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial =
size=3D2>Peter.</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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