I’m struggling, learning new things in UE4 and working on my archviz scene. My current issues are shadow quality and the light. Here s My worflow.
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i export my collada (dae) meshes from sketchup and i build my uvmap and lightmap (distance between my objects +/- 0,007) on blender.
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i export from blender my fbx on unreal engine and unselect ‘create new lightmap’ when i import.
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i change my lightmaps resolution to get the same lightmap density on my meshes.
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i put all my textures on neutral white to check the right light
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i change my lightmass settings in world settings
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I change the settings in baselightmass.ini to build light (production level)
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i got a lightmass importance volume and i use only the direct light, no artificial light
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i use a different post process volume to fix the light problem between outside and inside.
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How to remove the splotches in the area where there is no skylight hitting directly (Areas far from windows).
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Shadows become somewhat messy after a certain distance. How to make area shadows more clear and smooth.
tHank you 
ps: i have no overlapping problem on ue4
