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Does Lightmass take a long time to process Skylight Radiosity for other people?

Since I upgraded to 4.18 it seems like Lightmass spends most of it's time processing the Skylight Radiosity. Is this common on other people's systems as well? I just upgraded my processor to a fx-8320e for more threads and I have 16gb of ram. The processor cores are all at 100% and the memory usage is around 50% with little to no spikes on harddrive performance while I'm building my lightmaps.

Product Version: UE 4.18
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asked Dec 23 '17 at 07:10 PM in Rendering

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darkhemic
86 3 4 9

avatar image gurankas Aug 31 '18 at 12:54 PM

Anyone found any solution for this? My scene is not that complicated. It just has a fair bit of fauna and I have been told that it should take about 5 minutes to build my lighting; but after an hour, I'm still under 6%. I have an i5-6600 8 GB ram GTX 1060.

avatar image Makigirl Aug 31 '18 at 02:18 PM

Hi!

...imo it would be really helpful if any/all of you would post your settings (lightmass) too and not just the fact that it's slow!!

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4 answers: sort voted first

I noticed the same exact thing when I upgraded to 4.18. I let a light build run overnight (archviz VR) and after 12 hours I was at 6% complete using 30 cores swarmed together. After that, the mappings finished processing in under 5 hours. I've been tweaking settings to try to cut down render time but haven't found the key yet. I only have 5 skylight bounces and all lights except one are static. It does seem like the same setting used to take much less time to compute though.

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answered Mar 21 '18 at 05:27 PM

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jparido
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Hi!

I guess it depends on your settings (number of bounces, scale, quality)... the additional bounces are not "free" as it used to be before... But yeah the same here: lightmass uses 75% of all cpu, I have more ram but unreal never needed them all...

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answered Dec 23 '17 at 09:09 PM

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Makigirl
1.1k 3 4 8

avatar image darkhemic Dec 24 '17 at 03:56 PM

I've tried only 1 light bounce and 0 skylight bounces but skylight radiosity still takes the longest to process for my system. It takes about 1 hour and 30 mins for lightmass to complete and 1 hour and 15mins of that time is just processing skylight radiosity. I'm just trying to make sure something is wrong in my settings or if that is normal since 4.18.

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Well again it also depends on your scene... number of objects + lightmap resolution + those other settings... but it shouldn't be that long I guess!! Should be the same speed as it was with earlier releases!

Happy Christmas! ;)

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answered Dec 24 '17 at 04:15 PM

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Makigirl
1.1k 3 4 8

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anyone found an answer for this as i'm having the same problem 12 hours of Skylight Radiosity and still 0%. Using only 5 skylight bounces in world settings and Average lightmass is 256 for the archiviz scene.

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answered Jul 09 '18 at 12:58 PM

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OverbeckStudios
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