[ODE] Rope simulation

[Erin Catto]

I have created a particle system that uses a similar constraint solver as
ODE and I have it stable at 25 nodes for a rope. Here are some tweaks that
should help:

1. CFM doesn't help, set it to zero.
2. Reduce ERP, try 0.05 or 0.1
3. Make the links heavier as you approach the fixed end. For example, say
the rooted link is link 0, then use the rule: mass_i = 1.2*mass_i+1
4. Since you are using rigid bodies, not particles, you should ensure that
the inertia tensor is not too "skinny". Increase the axial inertia of the
links as needed.

Erin



-----Original Message-----
From: ode-bounces at q12.org [mailto:ode-bounces at q12.org] On Behalf Of Medvedev
Sergey
Sent: Tuesday, May 24, 2005 9:38 AM
To: ode at q12.org
Subject: [ODE] Rope simulation

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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