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Google + wikipedia what is DCI-P3, its gamma, its whitepoint and typical white level.
If you own a display which panel has not true HDR capabilities but cover a high % of P3, it’s very likely that you want a LUT3D HDR to SDR, Rec2020 as source, display profile as destination. Maybe it was what you were trying to do: to consume HDR content on a SDR P3 panel.
If memory serves, the current official madVR (v0.92.17) does not work with P3 3D LUTs. You need to use one of the betas (see https://www.avsforum.com/forum/showthread2.php?t=2954506&goto=newpost) where AFAIK this has been fixed.
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