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Occlusion culling laggy?

Hey I'm currently working on a fast paced drone game and I seem to have found a weakness in the built in occlusion culling, I don't want to disable it as it will be needed for performance in the future but was curious if there was a way to increase tolerances or eliminate this frame or two of lag?

Example video: https://www.youtube.com/watch?v=hTzI-2EyRe0

Product Version: UE 4.19
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asked Jul 31 '18 at 02:09 PM in Rendering

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MissKraya
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2 answers: sort voted first

That is expected side effect. Consider increasing overall framerate of your game, changing lighting setup, so that popping is not that visible, or disabling occlusion culling in project settings.

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answered Jul 31 '18 at 03:00 PM

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Deathrey
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avatar image MissKraya Jul 31 '18 at 04:45 PM

It definitely isn't intended... the game is running at 120fps in the video and I should be able to have dark indoor areas and not have to worry about this...If UE4 automatically culls objects there must be a tolerance setting somewhere.

avatar image Deathrey Aug 02 '18 at 07:57 AM

Yeah, this is totally intended due to how occlusion culling works. You can increase bounds scale of the objects, that give you problems, but it won't hold up on fast camera turns and will reduce effectiveness of culling to the point, where you might be better of extinguishing it completely.

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This is due to the GPU occlusion culling. there is a one frame lag. If you want to avoid it, Epic implemented software occlusion culling in 4.20. Switch to this should avoid the one frame delay but will increase the cpu workload. Its probably best to use it if you dont have too many objects. Try to use precomputed visibility culling, to save some performance there.

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answered Aug 02 '18 at 10:51 AM

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WAII
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