UE4滤镜：边缘模糊_ue4模型边缘虚化怎么做

float2 blurRadius = KernelSize / TextureSize;
float4 finalColor =Texture2DSample(Tex, TexSampler, UVs);
if(KernelSize==0){
return finalColor.a;
}
if(NumSamples==0){
return finalColor.a;
}
float2 newUV = UVs;
float alpha = 0;
for (int i=0;i<NumSamples;++i)
{
	float2 pdf = CosineSampleHemisphere(Hammersley(i, NumSamples, 0)).xy;
	float2 uvOffset = pdf * blurRadius;
	float2 uvShifted = UVs + uvOffset;
	float4 hitColor = Texture2DSample(Tex, TexSampler, saturate(uvShifted));
    alpha += hitColor.a;
}
alpha = alpha/NumSamples;
if (alpha > finalColor.a)
{
return alpha;
}
return finalColor.a;