bradb

Qhull is behaving correctly. Your code is using the 'QJ' option. Option 'QJ' perturbs the input sites to enforce general position and triangulated output. This option is called "joggled input"...

'QJ' performs a search that decreases precision by an order of magnitude each iteration. The first two runs joggled by 1.671e-009. For your point set, the search stopped at 0.017...