I agree. Very fortunate. He was Genius. Many moons ago (late 1970's and early 1980's, if memory serves), I implemented Warnock's hidden line elimination algorithm in a program at Grad school. It was designed to process very large CAD images with extreme detail using dynamic overlays and adaptive image partitioning (3D quad trees with pseudo recursion, written in Fortran). It ran on a Data General Eclipse mini-computer (and later on VAX under VMS). There is an example of the hidden line output used by Richard Feynman in his book "What do you care what other people think?" Pg, 159.
"A little time, a little trouble, your better day" Badfinger