How To Combine Baked Lighting and Reflections via Additive Blending - UNIGINE 2 Quick Tips
More flexibility in Global Illumination and reflections control is available with the Additive Blending mode. You can use it to blend lighting and reflections baked into separate probes together and control them separately.
More on using Additive Blending in UNIGINE 2: https://l.unigine.com/KCCGNssET
Download UNIGINE 2 SDK: https://l.unigine.com/Cx8dLDE-2