So Blurred glass material is impossible in Unreal Engine 4?

[anonymous_user_050222471 (anonymous_user_05022247)]

Coincidentally last “Epic Friday” I messed around with doing a radial style blur custom node. It only took 2 line changes to make it work with SceneColor like you want.

I added a distance mask as well so you can have the blur get slightly less as objects get closer to the glass.

This is probably not very optimized, I just barely got TempAA dithering working on it but the settings are very fiddly to fix the specular artifacts.

It requires that you hook up the SceneColor node somewhere in opacity otherwise the compiler won’t recognize the texture.

The material graph:

The hlsl code for the custom material node:

float3 CurColor;
float2 BaseUV = MaterialFloat2(ScreenAlignedPosition(Parameters.ScreenPosition).xy);
float2 NewUV = BaseUV;
int i;
float StepSize = Distance / (int) DistanceSteps;
float CurDistance;
float2 CurOffset;
float TwoPi = 6.283185;
float Substep;
float2 ScenePixels = View.RenderTargetSizeBaseUV;
float2 RandomSamp = View.TemporalAAParams.r+ScenePixels;
RandomSamp = ((uint)(RandomSamp.x) + 2 * (uint)(RandomSamp.y)) % 5;
RandomSamp=TempAARandom;
if (DistanceSteps<1)
{
return DecodeSceneColorForMaterialNode(NewUV);
}
else
{
while ( i < (int) DistanceSteps)
{

CurDistance += StepSize;
for (int j = 0; j < (int) RadialSteps; j++)
{
Substep++;
CurOffset.x = cos(TwoPi*((RandomSamp+Substep) / RadialSteps));
CurOffset.y = (TwoPi*((RandomSamp+Substep) / RadialSteps));
CurOffset =DistanceMask;
NewUV.x = BaseUV.x + (CurOffset.x * (CurDistance+RandomSampStepSize));
NewUV.y = BaseUV.y + (CurOffset.y * (CurDistance+RandomSampStepSize));
CurColor += DecodeSceneColorForMaterialNode(NewUV);
}
Substep+=0;
i++;
}
CurColor = CurColor / ((int)DistanceSteps(int)RadialSteps);
return CurColor;
}

How is this implemented with other nodes? Does anyone have the missing images that were linked in this post?