Unity3D 实现涡纹旋花效果[Shader]（一）

    今天为大家分享一下，如何写一个涡纹旋花效果的小Demo哈！

    1.新建一个Unity3d 项目，新建一个CameraFilterPack_Vision_Psycho.shader文件。
  

1. ///////////////////////////////////////////
   
2. //  CameraFilterPack v2.0 - by VETASOFT 2015 ///
   
3. ///////////////////////////////////////////
   
4. 
   
5. 
   
6. Shader "CameraFilterPack/Vision_Psycho" {
   
7. Properties
   
8. {
   
9. _MainTex ("Base (RGB)", 2D) = "white" {}
   
10. _TimeX ("Time", Range(0.0, 1.0)) = 1.0
    
11. _ScreenResolution ("_ScreenResolution", Vector) = (0.,0.,0.,0.)
    
12. }
    
13. SubShader
    
14. {
    
15. Pass
    
16. {
    
17. ZTest Always
    
18. CGPROGRAM
    
19. #pragma vertex vert
    
20. #pragma fragment frag
    
21. #pragma fragmentoption ARB_precision_hint_fastest
    
22. #pragma target 3.0
    
23. #pragma glsl
    
24. #include "UnityCG.cginc"
    
25. uniform sampler2D _MainTex;
    
26. uniform float _TimeX;
    
27. uniform float _Value;
    
28. uniform float _Value2;
    
29. uniform float _Value3;
    
30. uniform float _Value4;
    
31. uniform float4 _ScreenResolution;
    
32. struct appdata_t
    
33. {
    
34. float4 vertex   : POSITION;
    
35. float4 color    : COLOR;
    
36. float2 texcoord : TEXCOORD0;
    
37. };
    
38. struct v2f
    
39. {
    
40. half2 texcoord  : TEXCOORD0;
    
41. float4 vertex   : SV_POSITION;
    
42. fixed4 color    : COLOR;
    
43. };
    
44. v2f vert(appdata_t IN)
    
45. {
    
46. v2f OUT;
    
47. OUT.vertex = mul(UNITY_MATRIX_MVP, IN.vertex);
    
48. OUT.texcoord = IN.texcoord;
    
49. OUT.color = IN.color;
    
50. return OUT;
    
51. }
    
52. float4 frag (v2f i) : COLOR
    
53. {
    
54. float k=0.;
    
55. float2 uv=i.texcoord.xy;
    
56. float3 d =  float3(uv,1.0)/1.0-.5, o = d, c=k*d, p;
    
57. d += float3(tex2D(_MainTex, float2(0.1, 0.5)).rgb) * 0.01;
    
58. for( int i=0; i<12; i++ )
    
59. {
    
60. p = o+ cos(_TimeX);
    
61. for (int j = 0; j < 10; j++)
    
62. p = abs(p.zyx-.2) -.7,k += exp(-2. * abs(dot(p,o)));
    
63. k/=3.;
    
64. o += d *.5*k;
    
65. c = .97*c + .1*k*float3(k*k*k*_Value3,k*k*_Value4,_Value4);
    
66. }
    
67. float dist2 = 1.0 - smoothstep(_Value,_Value-0.05-_Value2, length(float2(0.5,0.5) - uv));
    
68. c =  .4 *log(1.+c);
    
69. float2 cc= float2(c.r/2*uv.x,c.r/2*uv.y);
    
70. c +=tex2D(_MainTex, cc);
    
71. c=lerp(tex2D(_MainTex,uv),c,dist2);
    
72. return float4(c,1.0);
    
73. }
    
74. ENDCG
    
75. }
    
76. }
    
77. }

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    2.shader完成后，我们需要考虑可以更改shader的一些参数，所以我们新建一个CameraFilterPack_Vision_Psycho.cs 组件类，方便使用。

1. ///////////////////////////////////////////
   
2. //  CameraFilterPack v2.0 - by VETASOFT 2015 ///
   
3. ///////////////////////////////////////////
   
4. using UnityEngine;
   
5. using System.Collections;
   
6. [ExecuteInEditMode]
   
7. [AddComponentMenu("Camera Filter Pack/Vision/Psycho")]
   
8. public class CameraFilterPack_Vision_Psycho : MonoBehaviour
   
9. {
   
10.     #region Variables
    
11.     public Shader SCShader;
    
12.     private float TimeX = 1.0f;
    
13.     private Vector4 ScreenResolution;
    
14.     private Material SCMaterial;
    
15.     [Range(0.01f, 1f)]
    
16.     public float HoleSize = 0.6f;
    
17.     [Range(-1f, 1f)]
    
18.     public float HoleSmooth = 0.3f;
    
19.     [Range(-2f, 2f)]
    
20.     public float Color1 = 0.2f;
    
21.     [Range(-2f, 2f)]
    
22.     public float Color2 = 0.9f;
    
23.     public static float ChangeValue;
    
24.     public static float ChangeValue2;
    
25.     public static float ChangeValue3;
    
26.     public static float ChangeValue4;
    
27.     #endregion
    
28.     #region Properties
    
29.     Material material
    
30.     {
    
31.         get
    
32.         {
    
33.             if (SCMaterial == null)
    
34.             {
    
35.                 SCMaterial = new Material(SCShader);
    
36.                 SCMaterial.hideFlags = HideFlags.HideAndDontSave;
    
37.             }
    
38.             return SCMaterial;
    
39.         }
    
40.     }
    
41.     #endregion
    
42.     void Start()
    
43.     {
    
44.         ChangeValue = HoleSize;
    
45.         ChangeValue2 = HoleSmooth;
    
46.         ChangeValue3 = Color1;
    
47.         ChangeValue4 = Color2;
    
48.         SCShader = Shader.Find("CameraFilterPack/Vision_Psycho");
    
49.         if (!SystemInfo.supportsImageEffects)
    
50.         {
    
51.             enabled = false;
    
52.             return;
    
53.         }
    
54.     }
    
55. 
    
56.     void OnRenderImage(RenderTexture sourceTexture, RenderTexture destTexture)
    
57.     {
    
58.         if (SCShader != null)
    
59.         {
    
60.             TimeX += Time.deltaTime;
    
61.             if (TimeX > 100) TimeX = 0;
    
62.             material.SetFloat("_TimeX", TimeX);
    
63.             material.SetFloat("_Value", HoleSize);
    
64.             material.SetFloat("_Value2", HoleSmooth);
    
65.             material.SetFloat("_Value3", Color1);
    
66.             material.SetFloat("_Value4", Color2);
    
67.             material.SetVector("_ScreenResolution", new Vector4(sourceTexture.width, sourceTexture.height, 0.0f, 0.0f));
    
68.             Graphics.Blit(sourceTexture, destTexture, material);
    
69.         }
    
70.         else
    
71.         {
    
72.             Graphics.Blit(sourceTexture, destTexture);
    
73.         }
    
74.     }
    
75. 
    
76.     void OnValidate()
    
77.     {
    
78.         ChangeValue = HoleSize;
    
79.         ChangeValue2 = HoleSmooth;
    
80.         ChangeValue3 = Color1;
    
81.         ChangeValue4 = Color2;
    
82. 
    
83.     }
    
84.     void Update()
    
85.     {
    
86.         if (Application.isPlaying)
    
87.         {
    
88.             HoleSize = ChangeValue;
    
89.             HoleSmooth = ChangeValue2;
    
90.             Color1 = ChangeValue3;
    
91.             Color2 = ChangeValue4;
    
92.         }
    
93. #if UNITY_EDITOR
    
94.         if (Application.isPlaying != true)
    
95.         {
    
96.             SCShader = Shader.Find("CameraFilterPack/Vision_Psycho");
    
97.         }
    
98. #endif
    
99.     }
    
100.     void OnDisable()
     
101.     {
     
102.         if (SCMaterial)
     
103.         {
     
104.             DestroyImmediate(SCMaterial);
     
105.         }
     
106.     }
     
107. }
     

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    3.我们通过点击屏幕按钮添加特效文件，所以在摄像机上附加AddCameraFilter.cs组件。

1. using UnityEngine;
   
2. using System.Collections;
   
3. 
   
4. public class AddCameraFilter : MonoBehaviour {
   
5. 
   
6.     private CameraFilterPack_Vision_Psycho _cameraFilterPack;
   
7.     // Use this for initialization
   
8.     void Start () {
   
9.         _cameraFilterPack = GetComponent();
   
10.     }
    
11.    
    
12.     // Update is called once per frame
    
13.     void OnGUI()
    
14.     {
    
15. 
    
16.         if (GUI.Button(new Rect(50, 200, 200, 30), "添加涡纹旋花效果"))
    
17.         {
    
18.             if(_cameraFilterPack==null)
    
19.                 _cameraFilterPack= gameObject.AddComponent();
    
20.             if (_cameraFilterPack != null)
    
21.                 _cameraFilterPack.enabled = true;
    
22.         }
    
23.         if (GUI.Button(new Rect(50, 250, 200, 30), "移除涡纹旋花效果"))
    
24.         {
    
25.             if (_cameraFilterPack != null)
    
26.                 _cameraFilterPack.enabled = false;
    
27.         }
    
28.     }
    
29. }
    

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    4.好吧！最后我们直接运行项目看效果啦！
   

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