Hello!
I have tried all the ways I could think of to mask a “Background Blur Widget” to get the result you see in the image:
But I have been unable, I think the problem is that I don’t know how to use the image section:
Or maybe it has something to do with the “alpha” section that I don’t quite know where it comes from either (since I don’t know which alpha it refers to).
Greetings and thanks in advance.
Blur strength - you can see it working immediately 
Thanks, but that’s not the problem. Maybe I’ve explained myself wrong, but I want to make a mask, I don’t want a blurred square, I want the blur to have a certain shape.
The best example is this one (although I want to do it with the tools that unreal already has and not pay to do it):
Ah… The only example of success I saw, was someone who modified the engine… :-/
It is doable using a slate post buffer.
This video shows an example.
I do not recommand the BackgroundBlurWithMask plugin.
We used it in Unreal 5.5 - 5.7, it often crashes in editor.
On 5.7, it doesn’t work in build.
