# Is there a way i can build only volumetric light cache?

**URL:** <https://forums.unrealengine.com/t/is-there-a-way-i-can-build-only-volumetric-light-cache/480851>\
**Category:** Rendering\
**Tags:** sublevel, building-lighting, sub-level, light-build, unreal-engine, question\
**Created:** [March 25, 2021, 9:45am UTC](https://forums.unrealengine.com/t/is-there-a-way-i-can-build-only-volumetric-light-cache/480851 "2021-03-25T09:45:34Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![rise678487](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@rise678487](https://forums.unrealengine.com/u/rise678487)\
**Post date:** [March 25, 2021, 9:45am UTC](https://forums.unrealengine.com/t/is-there-a-way-i-can-build-only-volumetric-light-cache/480851/1 "2021-03-25T09:45:34Z")

</div>

I have a very large consistent level contains many sub-levels, I used CPU for build lighting( r9 3950x) and it takes about 10h to finish but the result is not good as GPU (2070s) build with a half of time. But one drawback of GPU build lighting is VRAM limit, so i build sub level one by one with my GPU .When I combined sub-levels into consistent level, light cache just gone :((((. Does any know the way that i can rebuild only light cache in persistent level ? Many thank !!