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Decal has white border artifact on metals

alt text

This is a png in which there is the blood with the alpha channel. When I drag this decal on to shiny metals materials I continue to get this border. I am pretty sure I am making the alpha map correctly (as this decal looks fine on not-reflective non-shiny surfaces)

How can I get this border gone on my decals??

Product Version: UE 4.15
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asked Jul 21 '17 at 07:07 PM in Using UE4

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avatar image LostScout Jul 21 '17 at 07:55 PM

The problem seems to be in the metallic property. After lowering the metallic property by .2 the borders were gone. I have no clue why that is. Any Idea?

avatar image Zero-Night Aug 09 '17 at 11:37 AM

Metalness doesn't respond well to transitions between metal and nonmetal surfaces, it's just an artifact of the metal/rough PBR workflow.


Nothing you can do about it without modifying engine shaders. Just try to have the transition be as short as possible on that channel to reduce the problem a bit.

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