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Assets and Objects turning black

I have been building a game for a competition for the last four months, with the contest being Tomorrow. Yesterday, my partner for the contest was doing some touch up lighting on the second level, and some of the objects turned black. Now, anytime I place/replace/move lighting, it fixes the problem, but as soon as I rebuild the lighting on the level, everything that was previously broke is now black again.

Product Version: UE 4.14
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asked Apr 06 '17 at 07:50 PM in Rendering

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avatar image LeFxGuy Apr 06 '17 at 09:53 PM

Well, do you get any warnings, error messages after building? Did you check if the objects are set to static and have a lightmap uv? Did you check the lights, are they set to static or whatever they need to be?

avatar image amoser May 17 '17 at 09:50 AM

I'm having exactly the same problem, and unfortunately it's very difficult to find information about this since it gets drowned out by a bunch similar-sounding images (lightmap UVs, indirect lighting cache, etc). This is a totally separate issue, and I'm sure it's a bug since it (temporarily) gets resolved as soon as the object is moved or one of its materials is changed.

I've only noticed it happen with one object at a time, but when I tried deleting the offending object, a different nearby object had exactly the same problem. That seems particularly worrisome, since it suggests that this is a scene-wide mismatch of some kind that could potentially result in other issues or even the scene becoming corrupted/unopenable.

Out of curiosity, are you also using level streaming? I wonder if the engine might be having trouble counting references between multiple levels, e.g. things being double counted if the base layer has references to two levels, which in turn, BOTH reference another level.

EDIT: also, behold my ability to unintentionally answer your question -2 times

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