Help RuntimeRopeGenerator basic questions

Code:
public Transform startp;

 public Transform endp; 



 public Material material;



 private ObiRope rope;

 public ObiSolver solver;

 public ObiRopeBlueprint ropeBlueprint;

 private ObiRopeCursor cursor;



 public void createropeline()



  {



      solver = GameObject.Find("Obi Solver").GetComponent<ObiSolver>();     

      GameObject ropeObject = new GameObject("ObiRope");

      ropeObject.transform.SetParent(solver.transform);    

      rope = ropeObject.AddComponent<ObiRope>();



      var pinConstraints = rope.GetConstraintsByType(Oni.ConstraintType.Pin) as ObiConstraints<ObiPinConstraintsBatch>;

      pinConstraints.Clear();

      

      var ropeRenderer = ropeObject.AddComponent<ObiRopeLineRenderer>();

      ropeRenderer.uvScale = new Vector2(1, 5);

      ropeRenderer.material = material;



      

      rope.bendConstraintsEnabled = false;

      rope.stretchingScale = 0.5f;

      rope.aerodynamicsEnabled = false;



      

      int filter = ObiUtils.MakeFilter(ObiUtils.CollideWithEverything, 0);





      ropeBlueprint.path.Clear();

      ropeBlueprint.path.AddControlPoint(startp.position, Vector3.zero, Vector3.zero, Vector3.zero, 0.05f, 0.05f, 0.3f, filter, Color.white, "Start");

      ropeBlueprint.path.AddControlPoint(endp.position, Vector3.zero, Vector3.zero, Vector3.zero, 0.05f, 0.05f, 0.3f, filter, Color.white, "End");

      ropeBlueprint.path.FlushEvents();



      

      rope.ropeBlueprint = ropeBlueprint;

      

     

      AttachRopeEnds();



      

  }

  public void AttachRopeEnds()

  {

      if (rope == null || ropeBlueprint == null)

          return;



      var attachmentA = rope.gameObject.AddComponent<ObiParticleAttachment>();

      attachmentA.target = startp;

      attachmentA.particleGroup = ropeBlueprint.groups[0];

      attachmentA.attachmentType = ObiParticleAttachment.AttachmentType.Dynamic;



      var attachmentB = rope.gameObject.AddComponent<ObiParticleAttachment>();

      attachmentB.target = endp;

      attachmentB.particleGroup = ropeBlueprint.groups[ropeBlueprint.groups.Count - 1];

      attachmentB.attachmentType = ObiParticleAttachment.AttachmentType.Dynamic;



    

      

  }