去掉obi，使用自写绳索

Assets/Obi/Editor/Common/Utils/ObiRaycastHit.cs

@@ -1,26 +0,0 @@
-using UnityEngine;
-using System.Collections.Generic;
-
-namespace Obi
-{
-    public class ObiRaycastHit
-    {
-        
-        /// Distance from the Raycast origin to the point of impact.
-        public float distance;
-        /// The position in model space where a raycast intercepted a triangle.
-        public Vector3 position;
-        /// The normal in model space of the triangle that this raycast hit.
-        public Vector3 normal;
-        /// The triangle index of the hit face.
-        public int triangle;
-
-        public ObiRaycastHit(float distance, Vector3 position, Vector3 normal, int triangle)
-        {
-            this.distance   = distance;
-            this.position   = position;
-            this.normal     = normal;
-            this.triangle   = triangle;
-        }
-    }
-}