http://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/nurbs.html#t-supportlevels Or maybe the existing support levels somehow line up. Thanks, Joe -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://web3d.org/pipermail/x3d-public_web3d.org/attachments/20180905/69935a84/attachment.html>