去掉obi，使用自写绳索

Assets/Obi/Scripts/Common/DataStructures/Aabb.cs

@@ -1,53 +0,0 @@
-using UnityEngine;
-
-namespace Obi
-{
-    public struct Aabb
-    {
-        public Vector4 min;
-        public Vector4 max;
-
-        public Vector4 center
-        {
-            get { return min + (max - min) * 0.5f; }
-        }
-
-        public Vector4 size
-        {
-            get { return max - min; }
-        }
-
-        public Aabb(Vector4 min, Vector4 max)
-        {
-            this.min = min;
-            this.max = max;
-        }
-
-        public Aabb(Vector4 point)
-        {
-            this.min = point;
-            this.max = point;
-        }
-
-        public void Encapsulate(Vector4 point)
-        {
-            min = Vector4.Min(min, point);
-            max = Vector4.Max(max, point); 
-        }
-
-        public void Encapsulate(Aabb other)
-        {
-            min = Vector4.Min(min, other.min);
-            max = Vector4.Max(max, other.max);
-        }
-
-        public void FromBounds(Bounds bounds, float thickness, bool is2D = false)
-        {
-            Vector3 s = Vector3.one * thickness;
-            min = bounds.min - s;
-            max = bounds.max + s;
-            if (is2D)
-                max[2] = min[2] = 0;
-        }
-    }
-}