Reducing Resolution Scale in editor messes up actors selection in viewport

Development Rendering
, , , ,
1

Branch: This is a ‘Binary’ build from Unreal Launcher.

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

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

Repro Steps:

  1. Open “Minimal-Default” map from UE4 StarterContent of a new project.
  2. From “Settings → Engine Scalability Settings → Resolution Scale” reduce resolution to 50%.
  3. Click “Play → Simulate” option.
  4. Now in viewport try to click to select a chair actor or table or ground and repeat this for various actors in scene. You’ll notice click selection accuracy issues. When trying to select a chair sometimes ground will get selected instead. If you change “Resolution Scale” back to 100% you’ll notice selection accuracy is ok again.

issue has a 100% repro-rate.

2

Hey florin,

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

3

Thanks for quick feedback! Great work!

4

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 ticket, thanks in advance.