[ODE] Rope simulation

[Jon Watte (ODE)]

If you add inertial dampening (especially counter-torque) each timestep, 
it'll be much more stable. This is to simulate the internal friction of 
the rope.

At its simplest, you can express it something like:

dReal avDamp = -0.05f;
dReal lvDamp = -0.02f;
dReal const * dr = dBodyGetAngularVel( ropePiece );
dBodyAddTorque( ropePiece, dr[0]*avDamp, dr[1]*avDamp, dr[2]*avDamp );
dr = dBodyGetLinearVel( ropePiece );
dBodyAddForce( ropePiece, dr[0]*lvDamp, dr[1]*lvDamp, dr[2]*lvDamp );

Cheers,

			/ h+


Medvedev Sergey wrote:
> Hi everybody.
>   I  tried to simulate rope in ODE, seems to br stable when the number 
> of nodes up to 10.
> I  simulate 3km connection wire, so this rope has 30 nodes  connected by 
> ball-joints, the one  end  is unmovable, the rope hangs top-down.
>  This construction was not stable when I had tried to give force impulse 
> to lowest end.  Have you any idea what causes such problem (CFM,ERP may be)
>    There is also another question: Had anyone tried  to make a rope with 
> variable length, when for example you can clew it.
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