Radial Blur

【Radial Blur】

　　

　　核心代码如下：

 v2f vert (appdata_img v)
 {
     v2f o;
     o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
     o.uv = v.texcoord.xy;
     return o;
 }

 float4 frag (v2f i) : COLOR
 {
     float2 texCoord = i.uv;
     float2 dir = 0.5 – texCoord;
     float dist = length(dir);
     dir /= dist;
     float4 color = tex2D(_MainTex, texCoord);
     float4 sum = color;

     float samples[] = float[](-0.08,-0.05,-0.03,-0.02,-0.01,0.01,0.02,0.03,0.05,0.08);

     for (int i = ; i < ; ++i)
     {
         sum += tex2D(_MainTex, texCoord + dir*samples[i]*fSampleDist);
     }

     sum /= 11.0;
     float t = saturate(dist * fSampleStrength);
     return lerp(color, sum, t);
 } 

参考：

1、http://www.gamerendering.com/2008/12/20/radial-blur-filter/