# Black Lightmapping in UE4.12.5

**URL:** <https://forums.unrealengine.com/t/black-lightmapping-in-ue4-12-5/366517>\
**Category:** Rendering\
**Tags:** Lightmass, black, unreal-engine, Lightmap, question\
**Created:** [August 8, 2016, 5:37pm UTC](https://forums.unrealengine.com/t/black-lightmapping-in-ue4-12-5/366517 "2016-08-08T17:37:45Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![anonymous\_user\_4071fa6e1](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_4071fa6e1](https://forums.unrealengine.com/u/anonymous_user_4071fa6e1)\
**Post date:** [August 8, 2016, 5:37pm UTC](https://forums.unrealengine.com/t/black-lightmapping-in-ue4-12-5/366517/1 "2016-08-08T17:37:45Z")

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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](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](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/7/b/27b2e9f61dba551796dc70ba379839521f31eba3.jpeg)

 ![101997-100769-4.12.5.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/4/f/7/4f70ff4f6bd186f53a3a2e7e83f46c35797cdf1e.jpeg)

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**Author:** ![Tim\_Hobson](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Tim\_Hobson](https://forums.unrealengine.com/u/Tim_Hobson)\
**Post date:** [August 8, 2016, 8:39pm UTC](https://forums.unrealengine.com/t/black-lightmapping-in-ue4-12-5/366517/2 "2016-08-08T20:39:08Z")

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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)](https://issues.unrealengine.com/issue/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

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<div class="post-metadata">

**Author:** ![anonymous\_user\_4071fa6e1](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_4071fa6e1](https://forums.unrealengine.com/u/anonymous_user_4071fa6e1)\
**Post date:** [August 9, 2016, 4:23am UTC](https://forums.unrealengine.com/t/black-lightmapping-in-ue4-12-5/366517/3 "2016-08-09T04:23:52Z")

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Perfect!  
Thanks for the workaround Tim!