Unity3D Shdaer 实现镜头模糊效果[Shader]

原文链接：http://www.manew.com/thread-98523-1-1.html

效果如下：

shader代码：

Shader "Custom/CameraFilterPack_Blur_Movie" {Properties {_MainTex("Base(RGB)", 2D) = "white" {}_TimeX("Time", Range(0.0, 1.0)) = 1.0_Distortion("_Distortion", Range(0.0, 1.0)) = 0.3 _ScreenResolution("_ScreenResolution", Vector) = (0.0, 0.0, 0.0, 0.0)_Radius("_Radius", Range(0.0, 1000.0)) = 700 _Factor("_Factor", Range(0.0, 1000.0)) = 200}SubShader {Pass {ZTest Always CGPROGRAM#pragma vertex vert #pragma fragment frag #pragma fragmentoption ARB_precision_hint_fastest #pragma target 3.0 #pragma glsl #include "UnityCG.cginc"uniform sampler2D _MainTex;uniform float _TimeX;            uniform float _Distortion;            uniform float4 _ScreenResolution;            uniform float _Radius;            uniform float _Factor;struct appdata_t {float4 vertex : POSITION;float4 color : COLOR;float2 texcoord : TEXCOORD0;};struct v2f {half2 texcoord : TEXCOORD0;float4 vertex : SV_POSITION;fixed4 color : COLOR;};v2f vert(appdata_t IN){v2f o;o.vertex = mul(UNITY_MATRIX_MVP, IN.vertex);o.texcoord = IN.texcoord;o.color = IN.color;return o;}#define tex2D(sampler, uvs) tex2Dlod(sampler, float4((uvs), 0.0f, 0.0f))float4 frag(v2f i) : COLOR {float factor = _Factor / _ScreenResolution.y * 64.0;float radius = _Radius / _ScreenResolution.x * 2.0;float4 col = 0.0;float4 accumColx = 0.0;float4 accumW = 0.0;for(float j = -5.0; j < 5.0; j += 1.0){for(float u = -5.0; u < 5.0; u += 1.0){float2 offsetx = (1.0 / _ScreenResolution.xy) * float2(u + j, j - u);col = tex2D(_MainTex, i.texcoord.xy + offsetx * radius);float4 movie = 1.0 + col * col * col * factor;accumColx = accumColx + col * movie;accumW += movie;}}accumColx = accumColx / accumW;return accumColx;}ENDCG}}FallBack "Diffuse"}

C#代码：

using UnityEngine;[ExecuteInEditMode][AddComponentMenu("Camera Filter Pack/Blur/Movie")]public class CameraFilterPack_Blur_Movie : MonoBehaviour{    #region Variables    public Shader SCShader;    private float TimeX = 1.0f;    private Vector4 ScreenResolution;    private Material SCMaterial;    [Range(0, 1000)]    public float Radius = 150.0f;    [Range(0, 1000)]    public float Factor = 200.0f;    [Range(1, 8)]    public int FastFilter = 2;    public static float ChangeRadius;    public static float ChangeFactor;    public static int ChangeFastFilter;    #endregion    #region Properties    Material material    {        get        {            if (SCMaterial == null)            {                SCMaterial = new Material(SCShader);                SCMaterial.hideFlags = HideFlags.HideAndDontSave;            }            return SCMaterial;        }    }    #endregion    void Start()    {        ChangeRadius = Radius;        ChangeFactor = Factor;        ChangeFastFilter = FastFilter;        SCShader = Shader.Find("Custom/CameraFilterPack_Blur_Movie");        if (!SystemInfo.supportsImageEffects)        {            enabled = false;            return;        }    }    void OnRenderImage(RenderTexture sourceTexture, RenderTexture destTexture)    {        if (SCShader != null)        {            int DownScale = FastFilter;            TimeX += Time.deltaTime;            if (TimeX > 100) TimeX = 0;            material.SetFloat("_TimeX", TimeX);            material.SetFloat("_Radius", Radius / DownScale);            material.SetFloat("_Factor", Factor);            material.SetVector("_ScreenResolution", new Vector2(Screen.width / DownScale, Screen.height / DownScale));            int rtW = sourceTexture.width / DownScale;            int rtH = sourceTexture.height / DownScale;            if (FastFilter > 1)            {                RenderTexture buffer = RenderTexture.GetTemporary(rtW, rtH, 0);                Graphics.Blit(sourceTexture, buffer, material);                Graphics.Blit(buffer, destTexture);                RenderTexture.ReleaseTemporary(buffer);            }            else            {                Graphics.Blit(sourceTexture, destTexture, material);            }        }        else        {            Graphics.Blit(sourceTexture, destTexture);        }    }    void OnValidate()    {        ChangeRadius = Radius;        ChangeFactor = Factor;        ChangeFastFilter = FastFilter;    }    // Update is called once per frame    void Update()    {        if (Application.isPlaying)        {            Radius = ChangeRadius;            Factor = ChangeFactor;            FastFilter = ChangeFastFilter;        }#if UNITY_EDITOR        if (Application.isPlaying != true)        {            SCShader = Shader.Find("Custom/CameraFilterPack_Blur_Movie");        }#endif    }    void OnDisable()    {        if (SCMaterial)        {            DestroyImmediate(SCMaterial);        }    }}