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Owned by rendering thread [ULevel](API\Runtime\Engine\Engine\ULevel)'s MapBuildData GC-visible property guarantees that the [FPrecomputedVolumetricLightmapData](API\Runtime\Engine\FPrecomputedVolumetricLightmapDa-) will not be deleted during the lifetime of [FPrecomputedVolumetricLightmap](API\Runtime\Engine\FPrecomputedVolumetricLightmap).

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Owned by rendering thread ULevel's MapBuildData GC-visible property guarantees that the FPrecomputedVolumetricLightmapData will not be deleted during the lifetime of FPrecomputedVolumetricLightmap.

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