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 }