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Lightmap problems

I have made modular walls and I have also made Light Maps for the modular set. Every time I build the lighting i have these problems where each individual piece does not blend well at all in shaded areas: alt text
alt text

When I build the the walls outside of the interior it is perfect: alt textalt text

I have tried upping the resolutions of the lightmaps of all pieces and still nothing. Also the ground and roof are the same model and lightmap and the ground shadows are good and the roof looks bad. not sure why.



Product Version: UE 4.13
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asked May 05 '17 at 01:44 AM in Using UE4

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avatar image Umberto May 25 '17 at 05:19 PM

Assuming you have good UVs for the lightmap. and Assuming you have the correct UV index for said lightmap,

Check out this video:

Lighting & Rendering in Unreal Engine: An Evening with Epic Games here: https://www.gnomon.edu/community/events/lighting-rendering-in-unreal-engine-an-evening-with-epic-games


You should read this ENTIRE thread: https://forums.unrealengine.com/showthread.php?140006-Lightmass-multi-bounced-sky-lighting

best of luck

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2 answers: sort voted first

try to play with light setting in world settings: num of indirect, world scale and etc.

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answered May 05 '17 at 10:04 AM

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avatar image Garreezy May 05 '17 at 10:10 PM

I tried changing those settings and end up having the same results as before. Not sure why this is happening.

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When I started working with UE4, I encountered the same problem, the answer I was given was something along the line of "different pieces will be rendered by a different cpu core, and there will always be different results". I don't know the science behind this statement so please take it with a grain of salt, I accepted the answer and dropped that kind of modular assets for ArchViz for good (it was roughly 2 years ago, I moved on).

You can tweak the settings for absurd quality and you might be able to fix it or get really really close, but as far as I know, most artists create artificial seams to avoid this issue (imagine sci-fi corridor with something in between each wall tile). I don't think this is the way to go at all.

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answered May 25 '17 at 03:05 PM

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