Light build not building on mesh

Development Rendering
1

Hi guys, can shed light on why part of the mesh I imported wasn’t able to build lights?.. both had same lightmass setting, uv checked and correct… not in blueprint just static mesh and both set to static too.

The top turret and head of tank just refuses to build light…
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2

Does it appear correct in the Lightmap Density view? You should check the Lighting Only view too, as the lighting looks pretty accurate to me. From the screenshot, it almost appears as though you stopped the lighting build partway through…