Lighting channels do not function when the number of lights affecting actors is 79 or higher. Any number of lights that is 78 or fewer will honor lighting channel assignments.
Next, select the 'BP_SpawnPointLight' actor in the level and in the Details tab, adjust the Default > Count value from 79 to any number less than 79 and note that the 'Floor' is no longer being lit by 'BP_SpawnPointLight'.
Now, select the Sphere and uncheck Lighting Channels 1 and 2 (so it is no longer assigned to any Lighting Channel), observe Sphere goes dark.
Select 'BP_SpawnPointLight' again and change the 'Count' value back to 79 or higher, observe that the Sphere lights back up in spite of not being assigned to a Lighting Channel.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-51512 in the post.
3 |
Component | UE - Graphics Features |
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Affects Versions | 4.16.3, 4.17.2, 4.18 |
Target Fix | 4.20 |
Fix Commit | 3851889 |
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Main Commit | 4042226 |
Release Commit | 4095966 |
Created | Oct 20, 2017 |
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Resolved | Jan 23, 2018 |
Updated | May 31, 2018 |