UV overlapping is fine for UV0, but you need to ensure none are overlapping in UV1 which as @Raildex_ mentioned is typically your lightmap channel. Once you’ve ensured no islands are overlapping you shouldn’t receive an error or have dark objects.
UV overlapping is fine for UV0, but you need to ensure none are overlapping in UV1 which as @Raildex_ mentioned is typically your lightmap channel. Once you’ve ensured no islands are overlapping you shouldn’t receive an error or have dark objects.