Completely agree - any work on 3D algorithms seems particularly prone to this (presumably due to funding sources?) I once went so far as to email the author of

Completely agree - any work on 3D algorithms seems particularly prone to this (presumably due to funding sources?) I once went so far as to email the author of a paper to ask for their implementation of a Minkowski 3D hull algorithm, and they point blank refused. Now I don't believe I'm entitled to this of course, it's just strange you can claim something in a paper and for it to not be reproducible. Oddly I think it's the triviality of sharing implementations that make them more guarded.