Reparameterize a curve using Python?

Replies to This Discussion

Permalink Reply by David Rutten on May 30, 2012 at 3:19am

in c# it would be: curve.Domain = new Interval(0,1);

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Anders Holden Deleuran on May 30, 2012 at 3:35am

Thanks, David. From your pointer I did this:

c = rs.coercecurve(c)
i = rc.Geometry.Interval(0,1)
rc.Geometry.Curve.Domain.SetValue(c,i)

Seems to work.

Permalink Reply by Giulio Piacentino on May 30, 2012 at 10:01am

Hi Anders

c_ref = rs.coercecurve(c)
c_ref.Domain = rc.Geometry.Interval(0,1)
should do, too.

Usually users of the RhinoScript library use rs.CurveParameter(), that transforms a 0-1 parameter to a curve parameter. But assigning a new interval might be a good way in some cases, too.

Thanks,

- Giulio
_______________
giulio@mcneel.com

Permalink Reply by Anders Holden Deleuran on May 31, 2012 at 2:00am

Thanks Giulio, that makes it much clearer. I did fiddle a bit with the rs.CurveParameter() function as well. But, as you said, sometimes assigning a new interval is the way to go. Basically I was feeding a list of curves from a geometry pipeline component through a reparameterized curve parameter into the python component. Just wanted to get rid of that curve parameter in order to keep it a bit more "clean". So I think that this could be considered one of those cases you speak of :)

Thanks again,

Anders

Permalink Reply by Anders Holden Deleuran on September 28, 2012 at 7:04am

Hi again,
There seems to be an issue with setting the domain on PolyCurves (which I got from splitting a list of PolyLines). In the attached file the PolyCurves appear to have been reparameterized (if one prints their domain it is correctly shown to be 0,1). However if one plots a point at 0,5 and compares this with Grasshoppers own CurvePoint it is clear that there is something funky going on. Any ideas?
Best,
Anders

(This is running GH 0.80066 with Rhino Version 5.0  (5.1.20918.2135, 09/18/2012) by the way.)

Attachments:

• CurveDomainIssueInPython.gh, 40 KB
• CurveDomainIssueInPython.3dm, 461 KB

Permalink Reply by Anders Holden Deleuran on September 28, 2012 at 7:11am

Solved it. I had to use the PointAtNormalizedLength function instead of just PointAt. Dooh!