Black Lightmapping in UE4.12.5

Development Rendering
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1

There are two test projects (LM_Test_4.11.2 and LM_Test_4.12.5) contained within this zip file:
https://dl.dropboxusercontent.com/u/15053325/LM_Test.zip

When lighting is built for LM_Test_4.11.2 the lightmaps are baked as expected (as it always has).

However, if I switch (convert) the LM_Test_4.11.2 project to UE4.12.5 and [Build lighting] then the lightmappings is lost.

I also attempted merging the LM_Test_4.11.2 map into a new UE4.12.5 project.
The baked lighting migrates correctly, but again, if I [Build lighting] the lightmapping is lost.

(Fyi, The lightmap coord indices haven’t changed).

Does anyone know how to fix this issue?

101996-100768-4.11.2.jpg
101996-100768-4.11.2.jpg1130×971 187 KB

101997-100769-4.12.5.jpg
101997-100769-4.12.5.jpg1151×888 85.6 KB

2

Hi Ash,

This is a known issue with 4.12 with a target fix for 4.13 currently. You can follow the ticket here: Unreal Engine Issues and Bug Tracker (UE-33238)

Bounce cards currently do not work when the actor is set to “Actor Hidden in Game” to True. The workaround is to disable this when building lighting and then re-enable after the light build.

Thank you!

Tim

3

Perfect!
Thanks for the workaround Tim!