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Reducing Resolution Scale in editor messes up actors selection in viewport

Branch: This is a 'Binary' build from the Unreal Launcher.

Build version: 4.10.0-2758231+++depot+UE4-Releases+4.10 (running on Windows 10)

Detailed description of the issue: I noticed when using for example 50% Resolution Scale in the editor (when simulating a game directly in the viewport) it will mess up the actors selection. I assume it's because of wrong conversion of the viewport mouse click coordinates to the down-scaled render buffer? You can easily see this in the editor in the map "Minimal-Default" from the UE4 StarterContent (although it's not a map related issue).

Repro Steps:

  1. Open the "Minimal-Default" map from the UE4 StarterContent of a new project.

  2. From the "Settings -> Engine Scalability Settings -> Resolution Scale" reduce the resolution to 50%.

  3. Click the "Play -> Simulate" option.

  4. Now in the viewport try to click to select a chair actor or table or ground and repeat this for various actors in the scene. You'll notice the click selection accuracy issues. When trying to select a chair sometimes the ground will get selected instead. If you change the "Resolution Scale" back to 100% you'll notice the selection accuracy is ok again.

The issue has a 100% repro-rate.

Product Version: UE 4.10
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asked Nov 22 '15 at 09:15 PM in Bug Reports

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avatar image hurt720 Oct 13 '17 at 08:33 PM

It has been two years, and this issue is more relevant now with 4k screens and a need to have a lower viewport resolution for playable framerates. Please reopen the ticket, thanks in advance.

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Hey florin,

This is a known issue with UE4 that we have in our system as UE-5401. I've added your information to the report. We'll let you know if we see any update or if we require any additional information. Thanks for the report!

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answered Nov 23 '15 at 02:12 PM

avatar image florin.covit Dec 03 '15 at 09:12 AM

Thanks for the quick feedback! Great work!

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