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Blur UMG Not working on Android

Hi there, I have been trying to add blur component to my umg. It works really cool on desktop, editor preview, Open GL ES2.0 previiew, Open GL ES3.0 preview.

But the blur doesnot work on real android device, it renders transparent . The android device which I m using is ONE PLUS 6 and I m using OPENGL ES3.0 build. It renders fine on mobile preview inside editor with both OPENGL 2.0 and 3.0. I believe that there is a trick which only EPIC guys know and they don't want to reveal to general public.

I have tried for 3 days to get it working but no luck at all.

If someone knows how to get it working please help me out. I don't have any hope of getting any answer from EPIC.

Product Version: UE 4.20
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asked Oct 03 '18 at 04:57 PM in Bug Reports

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avatar image Jeff A ♦♦ STAFF Oct 03 '18 at 07:51 PM


We've recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.



avatar image ANURAGX Oct 04 '18 at 05:03 PM

I have submitted my report on your above link, I just hope this time EPIC guys behave properly and sort out the issue quickly.

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1 answer: sort voted first

I wonder if that effect requires Mobile HDR. Check your project settings and make sure Mobile HDR is turned on, click the green Restart button, and then try building to your Android device again from there and let me know if that helps. I'm just guessing because I know a lot of rendering features don't work without Mobile HDR enabled. Turning it off gives you faster performance and you might especially want it off for things like Paper2D projects where you don't need it in general, though. But a lot of things don't work with it on.

Also check your project settings: Target Hardward setting. Changing the Maximum/Scalable and Mobile/Desktop buttons there will give you a list of features that will be turned on/off with the new setting.

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answered Oct 03 '18 at 05:10 PM

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avatar image ANURAGX Oct 03 '18 at 05:19 PM

Thanks mate for quick response. The Mobile HDR is enabled. But in target hardware, its showing Motion Blur is disabled, is it the blur which is used in UMG.

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avatar image mightyenigma Oct 03 '18 at 07:22 PM

No, I am fairly sure that motion blur is only a post-process effect for objects moving in world space, not the UMG blur effect. Have you seen the UMG blur used on other mobile projects? If not, maybe it's not supported for mobile?

avatar image ANURAGX Oct 04 '18 at 04:58 PM

If UMG blur is not supported on mobile devices, then the blur should not work on mobile preview as well, but in mobile preview blur is working upon launch on android device (One Plus 6 ) it renders transparent. And also there is no official doc which states that blur is not supported on mobile.

avatar image mightyenigma Oct 04 '18 at 10:20 PM

Well I'm stumped. I thought I saw something in the official docs about which platforms support it, but I don't remember what it said.

avatar image ANURAGX Oct 05 '18 at 04:40 PM

Hi mate, Here is some screenshots to confirm the bug.

Blue UMG Widget PC Launch Mobile Preview on PC Mobile Screenshot

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avatar image Roi Danton Feb 03 '19 at 12:35 PM

I can reproduce this. Have you filed a bug report?

avatar image ANURAGX Feb 03 '19 at 04:18 PM
avatar image ANURAGX Feb 03 '19 at 04:19 PM

But I dont see it being resolved as of now, and Its target fix is 4.22

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