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Black artifacts and outline artifacts in editor viewports

I get black artifacts in the editor viewport. It's like anything forward-rendered (the UI mainly) gets "stuck" but with a black color. Like some buffer is not cleared correctly.

This happens in both lit and unlit mode, the only mode that is working correctly is wireframe. I can temporarily "clear" the blackness by switching to and from wireframe mode, but as soon as the camera transform is changed again, more blackness shows up.

This issue is more prone to happening in lower viewport sizes/resolutions. If I resize the viewport to make it bigger (or go fullscreen), the issue pretty much disappears. However, when I do this, I notice another issue; The "masking buffer" for the yellow actor selection outlines doesnt seem to get cleared either. When I rotate the camera view, the outline just grows according to where the selected actor is, but it doesnt disappear where it isnt.

This doesnt seem to happen in PIE/play mode.

EDIT: This doesnt happen either if I check "Game view"

Please poke me if you need more information or any clarifications.

System informaiton:

 Arch Linux x86_64
 Intel(R) Core(TM) i5-6440HQ CPU @ 2.60GHz
 Intel HD 530
 [2017.02.18-14.23.37:824][  0]LogRHI:   GL_VENDOR: Intel Open Source Technology Center
 [2017.02.18-14.23.37:824][  0]LogRHI:   GL_RENDERER: Mesa DRI Intel(R) HD Graphics 530 (Skylake GT2) 
 [2017.02.18-14.23.37:824][  0]LogRHI:   GL_VERSION: 4.5 (Core Profile) Mesa 17.0.0
 [2017.02.18-14.23.37:824][  0]LogRHI:   GL_SHADING_LANGUAGE_VERSION: 4.50
 LogInit: Build: ++UE4+Release-4.15-CL-0
 LogInit: Engine Version: 4.15.0-0+++UE4+Release-4.15
 LogInit: Compatible Engine Version: 4.15.0-0+++UE4+Release-4.15
 LogInit: Compiled (64-bit): Feb 18 2017 14:52:59
 LogInit: Compiled with Clang: 3.9.1 (tags/RELEASE_391/final)
 LogInit: Build Configuration: Development
 LogInit: Branch Name: ++UE4+Release-4.15

Product Version: UE 4.15
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asked Feb 18 '17 at 02:49 PM in Bug Reports

Fredrik.Haze gravatar image

6 1 1

ohookins gravatar image ohookins Feb 19 '17 at 08:08 PM

Anything like this? alt text

Fredrik.Haze gravatar image Fredrik.Haze Feb 19 '17 at 09:59 PM
ohookins gravatar image ohookins Feb 20 '17 at 08:11 PM

OK, that looks nothing like what I get.

Doug Wilson gravatar image Doug Wilson ♦♦ STAFF Feb 21 '17 at 01:23 PM

Hey Fredrik-

I do not see the same results in a new project on my end. Can you try updating your graphic drivers for me? Additionally, can you let me know what your Engine Scalability Settings and Preview Rendering Level are set at? You can find both of these in the Settings dropdown at the top of the viewport.

Fredrik.Haze gravatar image Fredrik.Haze Feb 21 '17 at 01:41 PM

I use the latest xf86-video-intel package on Arch Linux (xf86-video-intel 1:2.99.917+757+g93942b7d-1) in combination with the latest mesa packages (mesa and mesa-libgl 17.0.0-1). If you use Ubuntu or something, these versions (or newer) will inevitably come to those distros some time in the future as well.

Engine Scalability is set to low, changing the resolution scaling doesnt affect the issue. Setting scalability to high or above just gives me a completely black viewport.

Preview rendering level is set to SM5. I tried setting it to SM4, but now the editor doesnt respond. Will leave my laptop for a few mins and respond later.

Reading up on the wiki it's apparently recommended these days to ditch the xf86-video-intel and go with the bare modesetting driver. I will try this and come back to you.

Fredrik.Haze gravatar image Fredrik.Haze Feb 21 '17 at 02:06 PM

No change without xf86-video-intel. Now I just use the standard mesa and kernel drivers.

 Device: Mesa DRI Intel(R) HD Graphics 530 (Skylake GT2)  (0x191b)
Fredrik.Haze gravatar image Fredrik.Haze Feb 21 '17 at 01:55 PM

SM4 gives a completely corrupted viewport (looks like it just renders uninitialized buffers or something, random memory regions).

jasoncunsw gravatar image jasoncunsw 2 days ago

Currently using UE 4.15 and have an issue where the viewport screen displays black artefacts (which flicker both when editing and when Playing in Editor)

The other issues are that selected objects are highlighted even when highlight colour is set to transparent and the game object icons are chequer boarded at all times as though selected.

UE 4.14 was OK on the same iMac (Intel Iris Pro Graphics 6200).

It seems to be an incompatibility issue with the Intel Iris Pro Graphics 6200 as another iMac with Nvidia graphics don’t display the issues.alt text

artefacts.png (231.5 kB)
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