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[UE-67936] Strange material bug

Hi guys, I am having this strange issue with a material function I created in UE 4.21.1. The node result work perfectly fine in 4.18. I have attached images of both versions below. Can anyone please let me know what maybe wrong? Or am I staring at a bug :O

Steps to Reproduce - Open the editor, Create a material like the attached image, Select the cube preview mesh

Results: Artifacts appear across the mesh in 4.21.1

Expected: Artifacts would not appear (4.18 image)

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Product Version: UE 4.21
pixelnws-418.jpg (173.1 kB)
pixelnws-4211.jpg (177.6 kB)
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asked Jan 02 '19 at 01:46 PM in Bug Reports

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Dark X
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avatar image Jeff A ♦♦ STAFF Jan 02 '19 at 05:48 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 Dark X Jan 02 '19 at 08:28 PM

Thanks Jeff, just received an email from Epic regarding my bug submission. Eagerly waiting for a fix.

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Hello, I managed to get this resolved.

If anyone's wondering how, I clamped the Alpha's of the two Lerp nodes (which wasn't required in v4.18, v4.19).

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However, I just noticed that the bug report for the above issue was marked 'By Design' yesterday (14th Feb 19) on https://issues.unrealengine.com/issue/UE-67936 .

Can someone please explain what changed from v4.20?

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answered Feb 14 '19 at 09:25 PM

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Dark X
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avatar image [HP] Apr 16 '19 at 03:51 AM

I can confirm this solved the issue for me! Rather strange that the alpha needs to be clamped now, I know my way around the material editor and I don't think I would solve this in a milion years, so random. Regardnless, thanks!

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