# UE5.3 LandScape LightMap error with GPULightMass

**URL:** <https://forums.unrealengine.com/t/ue5-3-landscape-lightmap-error-with-gpulightmass/1330442>\
**Category:** Rendering\
**Tags:** unreal-engine, bug-report, Rendering, Lighting, question\
**Created:** [October 12, 2023, 2:47pm UTC](https://forums.unrealengine.com/t/ue5-3-landscape-lightmap-error-with-gpulightmass/1330442 "2023-10-12T14:47:34Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![zhushiboai](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@zhushiboai](https://forums.unrealengine.com/u/zhushiboai)\
**Post date:** [October 12, 2023, 2:47pm UTC](https://forums.unrealengine.com/t/ue5-3-landscape-lightmap-error-with-gpulightmass/1330442/1 "2023-10-12T14:47:34Z")

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create a landScape without nanite

 ![16970963017179](https://d3kjluh73b9h9o.cloudfront.net/original/4X/c/8/1/c8119eb5ee8b1fd71ce81b97eaed3681b27b023e.png)

BuildLight by GPULightMass. it cant get correct shadowmap

 ![16970959539578](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/5/7/257a6da0582add6f4ad5b87c529e2d846f4f0754.jpeg)

it can fix by build naniteData.  
 ![16970966425384](https://d3kjluh73b9h9o.cloudfront.net/original/4X/0/4/a/04a4052777e504277d01e4f1460b9e5ee2aba715.png)

 ![1697096504945](https://d3kjluh73b9h9o.cloudfront.net/original/4X/b/e/3/be3426bdb199f4412671a084be7853e5f5d3983b.jpeg)

only landScape with Nanite canbe use in UE5.3? or there is any settings i should change?

PS: the shadow also works correct in CPULightMass.

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**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\
**Post date:** [April 18, 2024, 4:15pm UTC](https://forums.unrealengine.com/t/ue5-3-landscape-lightmap-error-with-gpulightmass/1330442/2 "2024-04-18T16:15:01Z")

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hi @zhushiboai  
You will need the patch to UE 5.3 to make this work see  
[GPU Lightmass not working on Landscape 5.3 patch](https://forums.unrealengine.com/t/gpu-lightmass-not-working-on-landscape/1371174/17)

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**Author:** ![system](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/3/713c9d3f58553f0de89543d76a8a3a2779dc9fa4.png) [@system](https://forums.unrealengine.com/u/system)\
**Post date:** [May 18, 2024, 4:15pm UTC](https://forums.unrealengine.com/t/ue5-3-landscape-lightmap-error-with-gpulightmass/1330442/3 "2024-05-18T16:15:39Z")

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