在编辑模式下显示物体法向量脚本

 1 using UnityEngine;
 2 using System.Collections;
 3 using UnityEditor;
 4 public class ShowNormals :EditorWindow 
 5 {
 6     [MenuItem ("Window/Tools/Show Normals")]
 7     public static void InitWindow()
 8     {
 9         EditorWindow.GetWindow<ShowNormals>();
10     }
11 
12     public GameObject Model;
13      
14     void OnEnable()
15     {
16         SceneView.onSceneGUIDelegate += OnSceneGUI;
17     }
18     
19     void OnDisable()
20     {
21         SceneView.onSceneGUIDelegate -= OnSceneGUI;
22     }
23 
24     void OnGUI()
25     {
26      
27      
28     }
29 
30 
31 
32     void ShowNormal(Mesh mesh)
33     {
34         Handles.color=Color.green;
35         var vertices=mesh.vertices;
36         var normals=mesh.normals;
37 
38         for(var i=0;i<normals.Length;i++)
39         {
40             var start=vertices[i];
41             var end=start+normals[i];
42             Handles.DrawLine(start,end);
43         }
44     }
45     void OnSceneGUI(SceneView sceneView)
46     {
47         if(Selection.activeGameObject != null)
48         {
49             var go=Selection.activeGameObject.GetComponent<MeshFilter>();
50             if(go!=null)
51             {
52                 var mesh=go.sharedMesh;
53                  
54                 ShowNormal (mesh );                
55             }    
56         }
57     }
58 }