Tetra DCTLs with inversion and black point controls. Also a very mediocre pseudo-HSV version. Check out the others: https://github.com/calvinsilly/Tetrahedral-Interpolation https://www.juanjosalazar.com/color-science https://github.com/EmberLightVFX/Tetrahedral-Interpolation-for-Fusion https://github.com/xavijulez/Tetrahedral-Interpolation-DCTL https://github.com/npeason/Tetra-DCTLOFX