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Black faces after building lights

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Hi, I have been using ue4 for a while now, and this is the first time I have seen this problem. Each step (thread+riser) on my stairs is a separate mesh. Basically It is just copy and pasted, so they all have the same uvs, lightmaps, Lightmap density and mesh settings. But when I build the lights some faces just render completely black.

Product Version: UE 4.19
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asked Jul 07 '18 at 04:50 PM in Rendering

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BullmcCabe
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2 answers: sort voted first

I meant to post a reply to this months ago but I totally forgot. I got it fixed. It was a problem with lighting + reflections setup and the metallic panels on the steps. Originally I was using only static lights and a lot of them. Other people have had similar problems with static lights + Metallic materials. https://answers.unrealengine.com/questions/738564/why-metal-surface-get-very-dark-in-static-light.html Anyway I just simplified my lighting setup. I used 6 stationary lights to provide the main source of light and a few static lights here and there to highlight some details. Also I setup proper reflections

https://www.youtube.com/watch?v=4sPPGICx51w&t=11s

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answered Oct 26 '18 at 03:58 PM

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BullmcCabe
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Hi!

It's "always" a lightmap error! Maybe when you duplicated your meshes in your 3d app the normals got flipped! ...also could be duplicated faces looking at your screenshot... But it's almost 100% a lightmap issue! /could be missing, wrong channel is set...

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answered Jul 07 '18 at 10:12 PM

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Makigirl
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