在UnrealEngine中用Custom节点实现高斯模糊-白红宇

在UnrealEngine中用Custom节点实现高斯模糊

阅读量：6998 次

发布时间：2019-06-27

本文共 4161 字，大约阅读时间需要 13 分钟。

3x3高斯模糊//input sW 分辨率宽//input sH 分辨率高//input NotUse 为了开启SceneTextureLookup函数而连接的节点，但是不参与逻辑//input UV 屏幕缓存的坐标//14是原始颜色int tIndex=14;float4 x1y1=0.0625*SceneTextureLookup(UV+float2(-1.0f/sW,-1.0/sH),tIndex,false);float4 x2y1=0.125*SceneTextureLookup(UV+float2(0.0f,-1.0/sH),tIndex,false);float4 x3y1=0.0625*SceneTextureLookup(UV+float2(1.0f/sW,-1.0/sH),tIndex,false);float4 x1y2=0.125*SceneTextureLookup(UV+float2(-1.0f/sW,0.0f),tIndex,false);float4 x2y2=0.25*SceneTextureLookup(UV+float2(0.0f,0.0f),tIndex,false);float4 x3y2=0.125*SceneTextureLookup(UV+float2(1.0f/sW,0.0f),tIndex,false);float4 x1y3=0.0625*SceneTextureLookup(UV+float2(-1.0f/sW,1.0/sH),tIndex,false);float4 x2y3=0.125*SceneTextureLookup(UV+float2(0.0f,1.0/sH),tIndex,false);float4 x3y3=0.0625*SceneTextureLookup(UV+float2(1.0f/sW,1.0/sH),tIndex,false);return x1y1+x2y1+x3y1+x1y2+x2y2+x3y2+x1y3+x2y3+x3y3;

3X3均值模糊//input sW 分辨率宽//input sH 分辨率高//input NotUse 为了开启SceneTextureLookup函数而连接的节点，但是不参与逻辑//input UV 屏幕缓存的坐标//14是原始颜色int tIndex=14;float4 x1y1=SceneTextureLookup(UV+float2(-1.0f/sW,-1.0/sH),tIndex,false);float4 x2y1=SceneTextureLookup(UV+float2(0.0f,-1.0/sH),tIndex,false);float4 x3y1=SceneTextureLookup(UV+float2(1.0f/sW,-1.0/sH),tIndex,false);float4 x1y2=SceneTextureLookup(UV+float2(-1.0f/sW,0.0f),tIndex,false);float4 x2y2=SceneTextureLookup(UV+float2(0.0f,0.0f),tIndex,false);float4 x3y2=SceneTextureLookup(UV+float2(1.0f/sW,0.0f),tIndex,false);float4 x1y3=SceneTextureLookup(UV+float2(-1.0f/sW,1.0/sH),tIndex,false);float4 x2y3=SceneTextureLookup(UV+float2(0.0f,1.0/sH),tIndex,false);float4 x3y3=SceneTextureLookup(UV+float2(1.0f/sW,1.0/sH),tIndex,false);return (x1y1+x2y1+x3y1+x1y2+x2y2+x3y2+x1y3+x2y3+x3y3)/9;

　　看了官方论坛的帖子，法线Custom里面可以写for循环，于是……

//5x5高斯模糊//input sW 分辨率宽//input sH 分辨率高//input NotUse 为了开启SceneTextureLookup函数而连接的节点，但是不参与逻辑//input UV 屏幕缓存的坐标//14是原始颜色int tIndex=14;int UVOfferset[]={-2,-1,0,1,2};float Weights[]={	0.0036,0.0146,0.0256,0.0146,0.0036,	0.0146,0.0586,0.0952,0.0586,0.0146,	0.0256,0.0952,0.1501,0.0952,0.0256,	0.0146,0.0586,0.0952,0.0586,0.0146,	0.0036,0.0146,0.0256,0.0146,0.0036};float3 OutColor={0.0,0.0,0.0};for(int i=0;i<=4;i++){		for(int j=0;j<=4;j++)		{			OutColor+=Weights[i*5+j]*SceneTextureLookup(UV+float2(UVOfferset[j]/sW,UVOfferset[i]/sH),tIndex,false).xyz;		}}	return float4(OutColor,1.0f);

参考了一下网上的文章写了个可以动态调整的高斯模糊

//动态高斯模糊//input sW 分辨率宽//input sH 分辨率高//input NotUse 为了开启SceneTextureLookup函数而连接的节点，但是不参与逻辑//input Radius 模糊半径 //input UV 屏幕缓存的坐标//14是原始颜色int tIndex=14;if(Radius<1.0)	return SceneTextureLookup(UV,tIndex,false);float3 OutColor={0.0,0.0,0.0};Radius=floor(Radius);float Sigma=Radius/3;float Sigma2=2*Sigma*Sigma;int Number=Radius;float WeightsSum;for(int i=-Number;i<=Number;i++){	for(int j=-Number;j<=Number;j++)	{		float Weights=(1/(Sigma2*3.1415))*exp(-(j*j+i*i)/Sigma2);		WeightsSum+=Weights;		OutColor+=Weights*SceneTextureLookup(UV+float2(j/sW,i/sH),tIndex,false).xyz;	}}OutColor/=WeightsSum;return float4(OutColor,1.0f);

群里朋友需要一个模糊贴图的于是又写了个

//5x5高斯模糊//input UV 贴图UV//input Texture 传入TextureObject//input TexSize 图片大小，比如float2（512,512）int UVOfferset[]={-2,-1,0,1,2};float Weights[]={    0.0036,0.0146,0.0256,0.0146,0.0036,    0.0146,0.0586,0.0952,0.0586,0.0146,    0.0256,0.0952,0.1501,0.0952,0.0256,    0.0146,0.0586,0.0952,0.0586,0.0146,    0.0036,0.0146,0.0256,0.0146,0.0036};float3 OutColor={0.0,0.0,0.0};for(int i=0;i<=4;i++){        for(int j=0;j<=4;j++)        {			OutColor+=Weights[i*5+j]*Texture2DSample(Texture, TextureSampler, UV+float2(UVOfferset[j]/TexSize.x,UVOfferset[i]/TexSize.y));        }}  return float4(OutColor,1.0f);

//7x7均值模糊//input UV 贴图UV//input Texture 传入TextureObject//input TexSize 图片大小，比如float2（512,512）int UVOfferset[]={-3,-2,-1,0,1,2,3};float Weights[]={	1,1,1,1,1,1,1,	1,1,1,1,1,1,1,	1,1,1,1,1,1,1,	1,1,1,1,1,1,1,	1,1,1,1,1,1,1,	1,1,1,1,1,1,1,	1,1,1,1,1,1,1};float3 OutColor={0.0,0.0,0.0};for(int i=0;i<=6;i++){        for(int j=0;j<=6;j++)        {			OutColor+=Weights[i*7+j]*Texture2DSample(Texture, TextureSampler, UV+float2(UVOfferset[j]/TexSize.x,UVOfferset[i]/TexSize.y));        }}  return float4(OutColor,1.0f)/49;

转载于:https://www.cnblogs.com/blueroses/p/6363009.html

你可能感兴趣的文章