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How to use and set 8k resolution lightmaps for huge meshes in scene

I am trying to setup this architectural scene where entire floors are imported as single mesh. The UVs are flattened and does not overlap, but the amount of meshes in one UV is large that even 2k res lightmap is not enough (which is max that can be set in the engine). There are several building complexes and several floors for each, so breaking it up into smaller rooms is not an option. I know that unreal supports upto 8k res textures, can the same be applied for lightmap as well? How can it be done? Does a newer version of unreal (above 4.9) make this process easier or better?

Product Version: UE 4.9
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asked Jan 23 '16 at 07:56 AM in Using UE4

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