Help Some questions & requests

[landosilva]

Hi! I've bought Obi Rope some years ago but only now I'm getting my hands on it, and I’m having some issues. I will list them below.

1. How to set rope start and end position?
   I’m spawning ropes at runtime and I felt like the documentation and tutorials are missing some examples on this.
   What I was trying to do is to link the rope in two dynamic objects that has physics. So the attachment works but the rope is misplaced. I can’t figure out how to set the initial position of the rope’s start and end reliably. Here's the code:
   
   public void Connect(Transform origin, Transform end)
   { 
       _attachment1.target = origin;
       _attachment2.target = end;
   }
   
   public void SetStartPosition(Vector3 position)
   {
       int firstParticle = _rope.elements[0].particle1;
       _rope.solver.positions[firstParticle] = position;
   }
   
   public void SetLastPosition(Vector3 position)
   {
       int lastParticle = _rope.elements[^1].particle2;
       _rope.solver.positions[lastParticle] = position;
   }
   
   So basically, I'm spawning a rope inside an existing Solver in the Scene, calling "SetStartPosition", "SetLastPosition" and "Connect" in sequence. It seems to work only right after spawning. If I need to change the link to some other object I can't set the position again it seems.
   
   
2. Rope is too stretchy. How to handle that?
   I don’t want my rope to stretch too much when moving my objects. I saw in the docs that I can increase the amount of substeps in the fixed updater, or decrease Unity’s fixed timestep, but I don’t think I had good results. What am I missing?
   
   
3. How to reset Rope to it’s rest position?
   When I assign the rope to a new position (and when it works, see 1.) it seems to come with the motion from its original position, starting with a lot of movement already, and I don’t want that. How to stop the rope’s forces and return it to the rest state?
   Tried this but didn't get good results:
   
   private void StopRope()
   {
       foreach (int solverIndex in _rope.solverIndices)
       {
           _rope.solver.velocities[solverIndex] = Vector4.zero;
           _rope.solver.externalForces[solverIndex] = Vector4.zero;
       }
   }
   
   
4. Is it possible to make it influenced by Time.timeScale?
   My game is changing Time.timeScale sometimes, but it doesn’t seem to affect ropes. There is a workaround?
   
   
5. ArgumentOutOfRange ObiRopeCursor.cs:169
   I get this error sometimes when changing ropes length at runtime.
   

I think that's it for now. Any help is much appreciated.
Thanks!