I thought loop-blinn expired a while ago, or is the cubic curves separate from quadratic?
IIRC their patent is mainly for cubic curve filling. It's still in effect: https://patents.google.com/patent/US7564459B2/en
alt Hacker News
IIRC their patent is mainly for cubic curve filling. It's still in effect: https://patents.google.com/patent/US7564459B2/en