去掉obi，使用自写绳索

Assets/Obi/Editor/Common/Blueprints/Brushes/ObiScreenSpaceBrush.cs

@@ -1,61 +0,0 @@
-using UnityEngine;
-using UnityEditor;
-using System;
-using System.Collections;
-using System.Collections.Generic;
-
-namespace Obi
-{
-
-    public class ObiScreenSpaceBrush : ObiBrushBase
-    {
-        public ObiScreenSpaceBrush(Action onStrokeStart, Action onStrokeUpdate, Action onStrokeEnd) : base(onStrokeStart, onStrokeUpdate, onStrokeEnd) 
-        {
-            radius = 32;
-        }
-       
-        protected override float WeightFromDistance(float distance)
-        {
-            // anything outside the brush should have zero weight:
-            if (distance * EditorGUIUtility.pixelsPerPoint > radius)
-                return 0;
-            return 1;
-        }
-
-        protected override void GenerateWeights(Vector3[] positions)
-        {
-            for (int i = 0; i < positions.Length; i++)
-            {
-                // get particle position in gui space:
-                Vector2 pos = HandleUtility.WorldToGUIPoint(positions[i]);
-
-                // get distance from mouse position to particle position:
-                weights[i] = WeightFromDistance(Vector3.Distance(Event.current.mousePosition, pos));
-            }
-        }
-
-        protected override void OnRepaint()
-        {
-            base.OnRepaint();
-
-            Camera cam = Camera.current;
-            float depth = (cam.nearClipPlane + cam.farClipPlane) * 0.5f;
-
-            float ppp = EditorGUIUtility.pixelsPerPoint;
-            Vector2 mousePos = new Vector2(Event.current.mousePosition.x * ppp,
-                                           cam.pixelHeight - Event.current.mousePosition.y * ppp);
-
-            Handles.color = ObiEditorSettings.GetOrCreateSettings().brushColor;
-            Vector3 point = new Vector3(mousePos.x, mousePos.y, depth);
-            Vector3 wsPoint = cam.ScreenToWorldPoint(point);
-
-            var p1 = cam.ScreenToWorldPoint(new Vector3(1, 0, depth));
-            var p2 = cam.ScreenToWorldPoint(new Vector3(0, 0, depth));
-            float units = Vector3.Distance(p1, p2);
-
-            Handles.DrawWireDisc(wsPoint, cam.transform.forward, radius * units);
-        }
-
-    }
-}
-