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DX12 crashes when Forward Rendering + MSAA are enabled

Build Type: Binary and source build both exhibit this bug

Build version: 4.16.1 - 3466753

Description of the issue: Enabling Forward Rendering with MSAA with DX12 enabled causes an instant crash in the editor, caused by the Slate library.

Repro Steps

1. Create a new project

2. Set the project to use Forward Shading/Rendering and use MSAA for antialiasing

3. Restart the editor using the -DX12 option to force DirectX 12. The editor should instantly crash. The crash appears to occur most often in FViewport::Draw, although sometimes there are other assertion failures related to viewport rendering. They all appear to be triggered by code in Slate.

Frequency: 100%

Product Version: UE 4.16
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asked Jun 20 '17 at 06:24 PM in Bug Reports

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2 answers: sort voted first

Hey pseudoeric0,

I just attempted to reproduce this crash on my end but did reproduce the issue. Could you provide me with your full crash logs and your system's 'dxdiag' so I can gather more information in order to report this crash.

Since I was unable to reproduce the issue on my end, perhaps try updating your GPU to be sure it is not a driver issue.

Let me know if you have further questions.


Andrew H.

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answered Jun 23 '17 at 09:39 PM

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hi pseudoeric0,

I had the same issue when trying to convert an existing project with forwarding rendering and MSAA enabled, the editor would crash on startup from the desktop shortcut with dx12 enabled. I created a youtube video showing this.


It seems to be caused by MSAA and not the forward rendering. changing the AA (Anti-aliasing) to temporal allows me to launch successfully with dx12.

Hope this helps,

Jonathan B

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answered Apr 24 '19 at 03:03 PM

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