Blur effect: background color / color opacity bug

[monsieurbab]

Hello!

I'm facing a problem with the new blur effect. I have a UIBlock 2D with Blur Effect script attached (and also setup the Background Blur Group on my root gameobj) . All works well when the body background color is #FFFFFF 100%. But if I edit my background color to #000000 50%, this is not blurred anymore.
This seems like the blur is only created when background opacity is 100%.

Is this a bug or a wanted behaviour? Thanks.

[adgray1]

What you're describing is the expected behavior when changing the opacity on the blurred UIBlock. The "background blur" effect is achieved by creating a blurred image of the background content and rendering that through the Image features on the attached UIBlock. What that means is changing the opacity on a UIBlock using a blur effect yields the same result as changing the opacity on any UIBlock, which is it just makes the body of the UIBlock partially (or completely) transparent.

When the opacity is set to 50%, the blur is still technically there, but it's now partially transparent and rendering over the unblurred content - so the illusion starts to disappear.

If you add a UIBlock2D as a child of the blur effect UIBlock and have the child match its parent's width and height, then changing the opacity on the child UIBlock will likely produce an effect closer to what you're looking for!

[monsieurbab]

Thanks for the reply! Indeed, the solution you describe at the end of your message works.