Here is a quick demo using the blend function and the additional lut function. Starting with a night grade LUT and randomly flashing to a lightning grade LUT, effectively blending between them smoothly. The LUT shader is applied to a layer above everything and manipulated using the layer object.
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MuddyMole, this is perfect. Absolutely perfect with all the needed functions.
I use 3D LUTs to emulate film-stocks and do cinematic color grading. Some of my work on video games can be seen here:
For Fallout 4
Please login to see this link. - Emulating older film-stocks from the early-mid 1900s
Please login to see this link. - Emulating modern film-stocks
Please login to see this link. - Emulating advanced cinematic color grading from movies and my own creations