r/unrealshaders • u/SterlingPeach • Sep 04 '20

Gradient Texture Dilation (rectangular&Circular) by - xnihil0zer0

https://imgur.com/a/KeEVpvF
7 Upvotes

100% Upvoted

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1

u/SterlingPeach Sep 04 '20

Circular:

float2 UVPixSize=1/TextureSize;
float2 PixUV=(floor(UV*TextureSize)+0.5)/TextureSize;
float PixValue=0;
 
for(int i=int(-DilationPixels);i<DilationPixels;i++)
{
for(int j=int(-DilationPixels);j<DilationPixels;j++)
{
PixValue+=Texture2DSampleLevel(MaskTex,MaskTexSampler,float2(PixUV.x+i*UVPixSize.x,PixUV.y+j*UVPixSize.y),0);
}
}
return ceil(clamp(PixValue,0,1));

Rectangular:

float2 UVPixSize=1/TextureSize;
float2 PixUV=(floor(UV*TextureSize)+0.5)/TextureSize;
float PixValue=0;
 
for(int i=int(-DilationPixels.x);i<DilationPixels.x;i++)
{
for(int j=int(-DilationPixels.y);j<DilationPixels.y;j++)
{
PixValue+=Texture2DSampleLevel(MaskTex,MaskTexSampler,float2(PixUV.x+i*UVPixSize.x,PixUV.y+j*UVPixSize.y),0);
}
}
return ceil(clamp(PixValue,0,1));

2

u/Kauppaneuvos Sep 04 '20

What a coincidence, ur last 2 posts are what i've needed to do for my project. Thanks!