去掉obi，使用自写绳索

Assets/Obi/Samples/Common/SampleResources/Scripts/ActorCOMTransform.cs

@@ -1,23 +0,0 @@
-using System.Collections;
-using System.Collections.Generic;
-using UnityEngine;
-
-namespace Obi.Samples
-{
-    public class ActorCOMTransform : MonoBehaviour
-    {
-
-        public Vector3 offset;
-        public ObiActor actor;
-
-        public void Update()
-        {
-            if (actor != null && actor.isLoaded)
-            {
-                Vector3 com;
-                actor.GetMass(out com);
-                transform.position = actor.solver.transform.TransformPoint(com) + offset;
-            }
-        }
-    }
-}