control points of nurbs curves in grasshopper

hi, i've got a probbably pretty stupid but still important question:

i got this diamond grid in which i want to fit a nurbs curve; the grids vertices are the control points.

creating the curve is no problem but i can't get to the control points...

no matter what i feed into the "weight"- or "knot"- slot the curve doesn't appear & the component-button turns red!

i just want the nurbs curve to get closer to the grid's vertices...same as with rhino's "edit control point weight"

does someone have an idea?

thanx,

marta

Tags: control, nurbs, point, weight

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Permalink Reply by Pieter Segeren on December 17, 2011 at 3:56am

Hi Marta, is this what you want?

Attachments:

DiamondWeightedNurbs_PSG.gh, 4 KB

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Permalink Reply by Chris Tietjen on December 17, 2011 at 4:48am

Pieter,

How did you determine the values for the knot vector? I played around with this question but couldn't figure out what to use for the knot vector.

Chris

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Permalink Reply by Pieter Segeren on December 17, 2011 at 5:32am

Hi Chris, I believe the best discription would be reverse engineering: I created the curve in Rhino and used the Control Points comp on it.
Btw, as far as I know the list could also be simply 0 to 12... There is actually a comp to create the Knot Vectors in the Spline tab that will put out the latter.