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[UMG] Is there a way to mask background blur widget?

Hey Guys! I'm trying to create an effect where the edges of the screen are blurred in a circular fashion something like this image.

I tried using retainer box to mask out the entire widget with a blur background in it. But I'm unable to setup a material successfully that can give me a desired result. So any ideas or solutions are much appreciated.


Product Version: UE 4.17
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asked Aug 20 '17 at 06:58 PM in Using UE4

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avatar image Amaresh Aug 22 '17 at 07:04 AM

Just a gentle bump.

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I found the way of making such effect, but I think it can be done more effective:

  • make a "sniper" camera and assign a dynamic render texture into it

  • make a material that accepts render texture (from camera), and apply all necessary masks

  • in umg: make a background blur, add image and assign that material

What is bad in this approach:

  • you will render a scene twice: from a main camera and from a sniper camera. In my tests, 4K main camera, and 1024x1024 sniper camera I have 10 FPS drop (from 70 to 60)

  • part of the blur (almost 50% of your screen) will be covered by the image from a sniper camera

What would be nice to have: masked blur, to eliminate sniper camera and unnecessary blur.

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answered Feb 25 '18 at 06:15 PM

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