If I am not mistaken with the discussion that we do not have a true NURBS implementation in LinuxCNC at this point, but a NURB to Bi-arc conversion. It is likely that contouring would already work out of the box provided that you have enough look ahead. Offset surfaces are a well developed field in NURBS, but would need to be addressed separately if you wanted to go that way. If you did tackle NURB offset surfaces, it would provide a general solution that can be converted to simpler geometries.
EBo -- On Jun 2 2014 12:57 PM, bruno wrote: > of course I meant that point 2's weight is vastly different from 1 > and 3... > > anyway, I am most interested now in finding a solution to the tool > path > compensation not working with nurbs. > > Bruno > > On 6/2/14 7:06 PM, [email protected] > wrote: >> Message: 8 >> Date: Mon, 02 Jun 2014 19:05:59 +0200 >> From: bruno<[email protected]> >> Subject: Re: [Emc-developers] bug with nurbs ? >> To:[email protected] >> Message-ID:<[email protected]> >> Content-Type: text/plain; charset=ISO-8859-1; format=flowed >> >> Hi Chris, >> >> I did not know how to give the first point a weight, in addition I >> definitely had a bug in my GCode, in the sense that I wanted points >> 1 >> and 3 to have the same lower weight, but not point 2. With this >> change, >> the curve looks like I wanted and the path is followed very closely, >> even when the weight of point 3 is vastly different from 1 and 2 . >> Thanks for pointing this out. >> >> Now there is just the issue of G41, G42 that have no effect, do you >> have >> a fix for that ? >> >> I understand what you say about the nurb approximation. I think the >> optimal way to subdivide would be to use the curvature function of >> the >> curve and subdivide on each point where the curvature exceeds a >> given >> epsilon compared to the previous subdivision point. That way there >> would >> be more segments (or arcs) in sections of high curvature and fewer >> in >> flatter sections. >> >> Could you point me where in the code this is handled ? Maybe I could >> take a stab at implementing that... >> >> Cheers >> >> Bruno >> > > > > ------------------------------------------------------------------------------ > Learn Graph Databases - Download FREE O'Reilly Book > "Graph Databases" is the definitive new guide to graph databases and > their > applications. Written by three acclaimed leaders in the field, > this first edition is now available. Download your free book today! > http://p.sf.net/sfu/NeoTech > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
