去掉obi，使用自写绳索

Assets/Obi/Scripts/RopeAndRod/DataStructures/ObiRopeSection.cs

@@ -1,52 +0,0 @@
-using System.Collections.Generic;
-using UnityEngine;
-
-namespace Obi
-{
-    [CreateAssetMenu(fileName = "rope section", menuName = "Obi/Rope Section", order = 142)]
-	public class ObiRopeSection : ScriptableObject
-	{
-		[HideInInspector] public List<Vector2> vertices;
-		public int snapX = 0;
-		public int snapY = 0;
-
-		public int Segments{
-			get{return vertices.Count-1;}
-		}
-
-		public void OnEnable(){
-
-			if (vertices == null){
-				vertices = new List<Vector2>();
-				CirclePreset(8);
-			}
-
-    	}
-
-		public void CirclePreset(int segments){
-
-			vertices.Clear();
-
-			for (int j = 0; j <= segments; ++j){
-				float angle = 2 * Mathf.PI / segments * j;
-				vertices.Add(Mathf.Cos(angle)*Vector2.right + Mathf.Sin(angle)*Vector2.up);
-			}
-		}
-
-		/**
-		 * Snaps a float value to the nearest multiple of snapInterval.
-		 */	
-		public static int SnapTo(float val, int snapInterval, int threshold){
-			int intVal = (int) val;	
-			if (snapInterval <= 0)
-				return intVal;
-			int under = Mathf.FloorToInt(val / snapInterval) * snapInterval;
-			int over = under + snapInterval;
-			if (intVal - under < threshold) return under;
-			if (over - intVal < threshold) return over;
-			return intVal;
-		}
-
-	}
-}
-