I know it’s a late answer but to anyone who needs help here is what I’ve done to get the paint effect working.
I copied this :
float2 UV = GetDefaultSceneTextureUV(Parameters, 14);
float4 MeanAndVariance[4];
float4 Range;
float Angle = GetPixelAngle(UV);
float2x2 RotationMatrix = float2x2(cos(Angle), -sin(Angle), sin(Angle), cos(Angle));
Range = float4(-XRadius, 0, -YRadius, 0);
MeanAndVariance[0] = GetKernelMeanAndVariance(UV, Range, RotationMatrix);
Range = float4(0, XRadius, -YRadius, 0);
MeanAndVariance[1] = GetKernelMeanAndVariance(UV, Range, RotationMatrix);
Range = float4(-XRadius, 0, 0, YRadius);
MeanAndVariance[2] = GetKernelMeanAndVariance(UV, Range, RotationMatrix);
Range = float4(0, XRadius, 0, YRadius);
MeanAndVariance[3] = GetKernelMeanAndVariance(UV, Range, RotationMatrix);
// 1
float3 FinalColor = MeanAndVariance[0].rgb;
float MinimumVariance = MeanAndVariance[0].a;
// 2
for (int i = 1; i < 4; i++)
{
if (MeanAndVariance*.a < MinimumVariance)
{
FinalColor = MeanAndVariance*.rgb;
MinimumVariance = MeanAndVariance*.a;
}
}
return FinalColor;
into a “Custom” node.
Here is the final node :
