[4.15 P1] UMG Background Blur is opaque on a 3D Widget
I'm not sure if this is a bug or a known limitation, but I was playing around with the new UMG Background Blur widget and noticed that it does not work the same in the viewport and as a 3D widget.
If you have a 3D Widget with a Background Blur in it (and it has a value above 0), any area it covers will be opaque in the world. This includes transparency from images inside the widget itself. I was expecting it to blur the world behind it as it does when you add a widget with Blur to the viewport.
This limits the use of the blur widget pretty severely for 3D UIs/Menus since you can only use it on opaque images.
This is a 3D widget with only a blur widget in it, and a value of 1. As you can see it's completely opaque.
Here's another example but with an image under the background blur in the widget (in that example I resized the blur to be around the same size as the image).
I was able to reproduce this issue on our end. I have written up a report and I have submitted it to the developers for further consideration. I have provided a link to the public tracker. Please feel free to use the link provided for future updates. Thank you for your time and information.
Make it a great day
Edit: Corrected link
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