Gaussian blur post processing material

[Suhas_Sreenivas]

@devast3d

Hi all! While working on the project I needed Gaussian blur material. With the help of the forum folks, I managed to write one and thought that someone else may find it useful too! So here it is!

As you see not much is going on in the graph so here’s CustomNode code:

float3 res = 0;
float2 invSize = PostprocessInput0Size.zw;

float weights] =
{
0.01, 0.02, 0.04, 0.02, 0.01,
0.02, 0.04, 0.08, 0.04, 0.02,
0.04, 0.08, 0.16, 0.08, 0.04,
0.02, 0.04, 0.08, 0.04, 0.02,
0.01, 0.02, 0.04, 0.02, 0.01
};
float offsets] = { -2, -1, 0, 1, 2 };

uv *= 0.5;
for (int i = 0; i < 5; ++i)
{
float v = uv.y + offsets* * invSize.y;
int temp = i * 5;
for (int j = 0; j < 5; ++j)
{
float u = uv.x + offsets[j] * invSize.x;
float2 uvShifted = uv + float2(u, v);
float weight = weights[temp + j];
float3 tex = Texture2DSample(PostprocessInput0, PostprocessInput0Sampler, uvShifted).rgb;
res += tex * weight;
}
}

return float4(res, 1);

Enjoy!

p.s. It’s possible to separate the blur into horizontal and vertical passes, however in my case I needed to retain original contents of the render target thus made blurring in single step.

Hey! Thanks for this! Was a huge help! In the end you said it was possible to separate the blur into horizontal and vertical passes. I added 2 materials to a global postprocess volume; one of them was used to blur the image horizontally and the other in the vertical direction i.e, in separate passes as I decreased the priority of one of them. However, my results are less than desirable. Could you show me how you would write the shader for separate passes?