# Masked material shadows with Lightmass GPU no working

**URL:** <https://forums.unrealengine.com/t/masked-material-shadows-with-lightmass-gpu-no-working/1325296>\
**Category:** Rendering\
**Tags:** unreal-engine, Lighting, question\
**Created:** [October 7, 2023, 3:12pm UTC](https://forums.unrealengine.com/t/masked-material-shadows-with-lightmass-gpu-no-working/1325296 "2023-10-07T15:12:01Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Ozykz](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/ozykz/32/1194601_2.png) [@Ozykz](https://forums.unrealengine.com/u/Ozykz)\
**Post date:** [October 7, 2023, 5:41pm UTC](https://forums.unrealengine.com/t/masked-material-shadows-with-lightmass-gpu-no-working/1325296/2 "2023-10-07T17:41:41Z")

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Be aware that shadowing with GPULM in general is broken in 5.3: See [Epic's GPUlightmass](https://forums.unrealengine.com/t/epics-gpulightmass/139357/)

Could this be your issue?

If you can, test in 5.1.1, which is the last good working engine with GPU Lightmass.

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