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

    for (int i = 0; i < 10; ++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/