Re: what are advantages of dAMotorUser?

I have made small update to show how bad joint and amotor works for me:

http://www.kxl.com.pl/ODE/Update/demo_chain1.c

it is easy to notice, that after a litte play with a rope, red and blue
axis stop to be perpendicular to each other. How can I improve this?

PS. I have add a switch between using universal and ball+amotor joint.
Use:

#define useUNIVERSAL

or

#define useBALL

Thanks,

Krystian

Krystian Ligenza pisze:

Hi again,

I see that topic of amotor joint is not the interesting one for you?
I need to tune some parts of my plugin, that uses physics. I have made a
test case, a rope builded from capsule joined by universal joint. Here
is a source code:

http://www.kxl.com.pl/ODE/demo_chain1.c

(it is based on demo_chain1 so to run it simply make a copy of oryginal
file,override it, and build)
Demo work ok, but what I really need (not for the rope simulation, but
in my plugin) is:
- to have that last third axis(twist axis) possible to use (so I need
ball joint?)
- I need to have limits on all axis, but for twist they can be lower
that Pi/2 (so I need also amotor, but use it in euler or user mode? Do
they have similar results?)
- to have possibility to form shapes from this rope (by adding a torque
or using dParamVel to joints? ), so I can make it to look like L,S or V
- make it close to stable

when I will finish, I can provide this as a demo for ODE, becouse I
think it could help more then only me.

Thanks
Krystian

Krystian Ligenza pisze:

Hi,

I must correct way my ragdoll behave. In most for bone-joints Im using
universal joint, but there are few that have ball and amotor joint. As
for now Im using dAMotorEuler and have strange jitering in a motion.
What are the advantages of using dAMotorUser?

Thank you!
Krystian
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