About 10 years ago the author developed a computer program for plotting the color gamuts of sets of pigments. The application of this program was discussed in an internal DuPont publication, but, the details of its operation were never published.
David L. Spooner,
"Derivation of the color-gamut plots of prepress proofing systems", Proc. SPIE 1250, Perceiving, Measuring, and Using Color, (1 August 1990); doi: 10.1117/12.19702; https://doi.org/10.1117/12.19702