设置摄像机的非对称投影矩阵

王者再临

设置摄像机的非对称投影矩阵

1. using UnityEngine;
   
2. using System.Collections;
   
3. using System.Collections.Generic;
   
4. 
   
5. public class CamProjectionMatrix : MonoBehaviour
   
6. {
   
7. 
   
8.     public float left;
   
9.     public float right;
   
10.     public float top;
    
11.     public float bottom;
    
12. 
    
13.     public Camera mCam;
    
14.     public GameObject obj;
    
15. 
    
16.     bool init;
    
17. 
    
18.     void Start()
    
19.     {
    
20.         RateTrasform(mCam.gameObject, obj, mCam.nearClipPlane, out left, out right, out top, out bottom);
    
21.         init = true;
    
22.     }
    
23. 
    
24.     void LateUpdate()
    
25.     {
    
26.         if(init)
    
27.         {
    
28.             obj.SetActive(false);
    
29.         }
    
30. 
    
31.         //RateTrasform(mCam.gameObject, obj, mCam.nearClipPlane, out left, out right, out top, out bottom);
    
32.         Matrix4x4 m = PerspectiveOffCenter(left, right, top, bottom, mCam.nearClipPlane, mCam.farClipPlane);
    
33.         mCam.projectionMatrix = m;
    
34.         
    
35.     }
    
36. 
    
37. 
    
38. 
    
39.     public static Matrix4x4 PerspectiveOffCenter(float left, float right, float top, float bottom, float near, float far)
    
40.     {
    
41.        // Debug.Log("   " + left + "   " + right + "  " + top + "  " + bottom);
    
42.         float x = 2.0F * near / (right - left);
    
43.         float y = 2.0F * near / (top - bottom);
    
44.         float a = (right + left) / (right - left);
    
45.         float b = (top + bottom) / (top - bottom);
    
46.         float c = -(far + near) / (far - near);
    
47.         float d = -(2.0F * far * near) / (far - near);
    
48.         float e = -1.0F;
    
49.         Matrix4x4 m = new Matrix4x4();
    
50.         m[0, 0] = x;
    
51.         m[0, 1] = 0;
    
52.         m[0, 2] = a;
    
53.         m[0, 3] = 0;
    
54.         m[1, 0] = 0;
    
55.         m[1, 1] = y;
    
56.         m[1, 2] = b;
    
57.         m[1, 3] = 0;
    
58.         m[2, 0] = 0;
    
59.         m[2, 1] = 0;
    
60.         m[2, 2] = c;
    
61.         m[2, 3] = d;
    
62.         m[3, 0] = 0;
    
63.         m[3, 1] = 0;
    
64.         m[3, 2] = e;
    
65.         m[3, 3] = 0;
    
66.         return m;
    
67.     }
    
68. 
    
69.     void RateTrasform(GameObject cam, GameObject obj, float near, out float left, out float right, out float top, out float bottom)
    
70.     {
    
71.         float xSize = obj.GetComponent<MeshFilter>().mesh.bounds.size.x * obj.transform.localScale.x/2.0f;
    
72.         float ySize = obj.GetComponent<MeshFilter>().mesh.bounds.size.y * obj.transform.localScale.y / 2.0f;
    
73. 
    
74. 
    
75.         float leftx = obj.transform.position.x - xSize;
    
76.         float rightx = obj.transform.position.x + xSize;
    
77.         float topy = obj.transform.position.y + ySize;
    
78.         float bottomy = obj.transform.position.y - ySize;
    
79. 
    
80.         left = leftx - cam.transform.position.x;
    
81.         right = rightx - cam.transform.position.x;
    
82.         top = topy - cam.transform.position.y;
    
83.         bottom = bottomy - cam.transform.position.y;
    
84. 
    
85.         float zlenght = obj.transform.position.z - cam.transform.position.z - obj.transform.localScale.z / 2.0f;
    
86. 
    
87.         left = near * left / zlenght;
    
88.         right = near * right / zlenght;
    
89.         top = near * top / zlenght;
    
90.         bottom = near * bottom / zlenght;
    
91.     }
    
92. 
    
93. }

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