3DVISION writes: Pure-Sky is a 100% procedural sky, which can generate a blue or stormy sky, with a realistic or cartoon style. The 2.1 update adds real-time “Lens Flares”.

Source

from BlenderNation https://www.blendernation.com/2020/12/10/pure-sky-2-1-adds-real-time-lens-flares/
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