Python nurbCrv

hello! hope u doing very well!

i need some help with python to generate a nurbsCrv from a list of points created in python script.

any idea?


Hi @oliver.jans,

Hope you’re doing fine too!

Sure, let’s say your list of points is called, well points, than you can do the following:

import Rhino.Geometry as rg

curve = rg.Curve.CreateInterpolatedCurve(points, 3) # 3 = degree
curve.ToNurbsCurve() # maybe redundant ?
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hello @diff-arch is there any method to edit weights??


Take a look at the NurbsCurve class documentation. You can search for “Greville” to see all methods that you can manipulate the Greville edit points with.

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@diff-arch hello again! I examined the link and thought i understood everything but was mistaken. i find it really hard to edit the greville pts very confusing. would u mind sharing some of your experience w/ me?

any time. no need to hurry


Could you maybe explain what you want to do? It would make things much easier. :slight_smile:

I need a pwk nurbs Quadratic Crv to edit weights of ctrl points. How do i edit weights w Python script?

I have no idea what that is! pwk? :wink:

Starting from what we had above, you could do the following to alter the control point weights:

import Rhino.Geometry as rg
import random

# Create an interpolated curve
curve = rg.Curve.CreateInterpolatedCurve(points, 3) # 3 = degree
# Make it rational which means that it has weighted control points
print curve.IsRational

# Randomly change the weights
control_points = []
for i in range(curve.Points.Count): # loop through the control points by index
    curve.Points.SetWeight(i, random.random()) # set a random weight for the control point at index i
    control_points.append(curve.Points[i].Location) # optional

You have to tag me or reply to one of my answers directly, otherwise I won’t be notified, if you post something that I’m concerned with.

Anyways, the randomization produces quite funky results. :wink:

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Perfect! Thank u for posting

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