Radial Blur

【Radial Blur】

　　核心代码如下：

 1 v2f vert (appdata_img v)
 2 {
 3     v2f o;
 4     o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
 5     o.uv = v.texcoord.xy;
 6     return o;
 7 }
 8
 9 float4 frag (v2f i) : COLOR
10 {
11     float2 texCoord = i.uv;
12     float2 dir = 0.5 – texCoord;
13     float dist = length(dir);
14     dir /= dist;
15     float4 color = tex2D(_MainTex, texCoord);
16     float4 sum = color;
17
18     float samples[10] = float[](-0.08,-0.05,-0.03,-0.02,-0.01,0.01,0.02,0.03,0.05,0.08);
19
20     for (int i = 0; i < 10; ++i)
21     {
22         sum += tex2D(_MainTex, texCoord + dir*samples[i]*fSampleDist);
23     }
24
25     sum /= 11.0;
26     float t = saturate(dist * fSampleStrength);
27     return lerp(color, sum, t);
28 } 

参考：

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