[ODE] adhesive strength of Hingejoint

[Hampus Soderstrom]

Hi Patrick,

dParamFMax also specifies the amount of force needed to move the hinge.

I'm not sure why you don't get any effect at all though. I use fmax  
for stiff hingejoints in my simulation and it works quite well.

cheers

/Hampa
toribash.com


27 feb 2006 kl. 23.36 skrev Patrick Oppermann:

>
> Hm, I tried a value of 1.000.000 and it had no effect at all (the arm
> segments have a mass of 100 and 50). dParamFMax specifies the  
> maximum amount
> of force that the hinge can apply to its two Bodies. But I need to  
> control
> the "stiffness" of the hinge so it doesn't sink down when its  
> velocity is 0.
>
> See the screenshot at http://www.totalhavoc.de/dev/robotArm.JPG
> Patrick
>
> --------------------------------------------------------------------
>
> Hi Patrick,
>
> Setting dParamFMax to a high value and dParamVel to 0 would hold the
> joint.
>
> cheers
>
> Hampa
> Toribash.com
>
> ---------------------------------------------------------------------
> 26 feb 2006 kl. 21.20 skrev Patrick Oppermann at gmx.de:
>
> Hi!
> I am  working on a virtual assembly arm (with the jMonkeyEngine and
> jmePhysics), which basically consists of boxes connected by
> JointHinge objects.
>
> The Problem is that the arm is always sagging down because of its own
> weight as soon as it is stopped by setting the hinge's velocity to 0.
> Neither reducing the mass solves the problem, nor does increasing the
> torque.
>
> Is there a way to stabilize the arm when it is not moving? Is there a
> specific ode parameter that controls the ,grip', the adhesive
> strength of the Joint? I couldn't find any yet.
>
> I tried to stabilize it by setting the Hinge's minAngle and maxAngle
> stops to its current rotation angle (plus/minus a little tolerance)
> when it is stopped. Unluckily the Joint seems to be reset completely
> by dJointSetHingeParam() with the parameter dParamVel. Is that so?
>
> greetings
> Patrick
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