hello everone

I created nurbs curve rs.AddNurbsCurve, but does not appear in rhino window，Such as pictures，I use rhinocommon can successfully create nurbs curve，Such as pictures，How do I use rs.AddNurbsCurve create nurbs curve，help me，thanks

# Rs.AddNurbsCurve encountered some problems

**603419608**(NARUTO) #1

**dale**(Dale Fugier) #2

I am able to repeat the problem. I’ll see that a fix makes it into the next Rhino SR.

Thanks for reporting.

**603419608**(NARUTO) #3

Hi dale

I solved this problem,rs.addnurbscurve weighs must be set parameters,orchange the code,Example：

#coding=utf-8

import scriptcontext

import rhinoscriptsyntax as rs

import utility as rhutil

import Rhino

import math

import System.Guid, System.Array, System.Enum

def AddNurbsCurve(points, knots, degree, weights=None):

""“Adds a NURBS curve object to the document

Parameters:

points = list containing 3D control points

knots = Knot values for the curve. The number of elements in knots must

equal the number of elements in points plus degree minus 1

degree = degree of the curve. must be greater than of equal to 1

weights[opt] = weight values for the curve. Number of elements should

equal the number of elements in points. Values must be greater than 0

"”"

points = rhutil.coerce3dpointlist(points, True)

cvcount = len(points)

knotcount = cvcount + degree - 1

if len(knots)!=knotcount:

raise Exception(“Number of elements in knots must equal the number of elements in points plus degree minus 1”)

if not weights:

weights = [2 for i in range(cvcount)]

else:

if len(weights)!=cvcount:

raise Exception(“Number of elements in weights should equal the number of elements in points”)

weights = weights

rational = (weights!=None)

```
nc = Rhino.Geometry.NurbsCurve(3,rational,degree+1,cvcount)
#nc = Rhino.Geometry.NurbsCurve.Create(rational,degree,points)
for i in xrange(cvcount):
cp = Rhino.Geometry.ControlPoint()
cp.Location = points[i]
if weights: cp.Weight = weights[i]
nc.Points[i] = cp
for i in xrange(knotcount): nc.Knots[i] = knots[i]
rc = scriptcontext.doc.Objects.AddCurve(nc)
if rc !=System.Guid.Empty:
scriptcontext.doc.Views.Redraw()
else:
raise Exception("Unable to add curve to document")
return rc
```

def addnurbscurve():

pts = rs.GetObjects()

knot = [0.0,0.0,0.0,1.0,1.2,3.0,3.0,3.0]

weight = [8,6,3,8,4,8]

curve=AddNurbsCurve(pts, knot,3,weight)

if curve:

print(curve,type(curve))

return curve

cv=addnurbscurve()

print rs.CurveWeights(cv)

**603419608**(NARUTO) #5

HIi dale

I found another problem,rs.OffsetSurface not be offset trim Surface and Triangle Surface，

e,Example：

import scriptcontext

import math

import Rhino

import System.Guid

import utility as rhutil

import object as rhobject

import rhinoscriptsyntax as rs

def OffsetSrf(surface_id, distance, tolerance=None, both_sides=False, create_solid=False):

""“Offsets a trimmed or untrimmed surface by a distance. The offset surface

will be added to Rhino.

Parameters:

surface_id = the surface’s identifier

distance = the distance to offset

tolerance [opt] = The offset tolerance. Use 0.0 to make a loose offset. Otherwise, the

document’s absolute tolerance is usually sufficient.

both_sides [opt] = Offset to both sides of the input surface

create_solid [opt] = Make a solid object

Returns:

identifier of the new object if successful

None on error

”""

brep = rhutil.coercesurface(surface_id, True)

face = None

if brep is None: return scriptcontext.errorhandler()

face = brep

if tolerance is None: tolerance = scriptcontext.doc.ModelAbsoluteTolerance

newbrep = Rhino.Geometry.Brep.CreateFromOffsetFace(face, distance, tolerance, both_sides, create_solid)

if newbrep is None: return scriptcontext.errorhandler()

rc = scriptcontext.doc.Objects.AddBrep(newbrep)

if rc==System.Guid.Empty: return scriptcontext.errorhandler()

scriptcontext.doc.Views.Redraw()

return rc

Thanks

I have the same problem.

I created nurbs curve rs.AddNurbsCurve, but does not appear in rhino window,Such as pictures，How do I use rs.AddNurbsCurve create nurbs curve，help me，thanks

**dale**(Dale Fugier) #8

Hi @Hiroo_Maruyama,

Can you provide the source code that you cannot make work? I’d rather not re-type your screen capture…

– Dale

Hi, @dale

I am sorry not to paste my source code…

I pasted the source code.

import rhinoscriptsyntax as rs

import random as rd

curve = rs.GetObject(“Select a curve”, 4)

if curve:

points = rs.CurvePoints(curve)

knots = rs.CurveKnots(curve)

degree = rs.CurveDegree(curve)

```
newpoints = []
for p in points:
dx = rd.randrange(0,5)
dy = rd.randrange(0,5)
dz = rd.randrange(0,5)
d = [dx, dy, dz]
q = rs.PointAdd(p,d)
newpoints.append(q)
newcurve = rs.AddNurbsCurve(newpoints, knots, degree)
print newcurve
```

**Alain**(Alain Cormier) #10

Hi.

Your code has non ascii characters and improper indentation. Better paste code in a code block like this:

```
import rhinoscriptsyntax as rs
import random as rd
curve = rs.GetObject("Select a curve", 4)
if curve:
points = rs.CurvePoints(curve)
knots = rs.CurveKnots(curve)
degree = rs.CurveDegree(curve)
newpoints = []
for p in points:
dx = rd.randrange(0,5)
dy = rd.randrange(0,5)
dz = rd.randrange(0,5)
d = [dx, dy, dz]
q = rs.PointAdd(p,d)
newpoints.append(q)
newcurve = rs.AddNurbsCurve(newpoints, knots, degree)
print newcurve
```

Sorry, I can not reproduce the problem.

If you run the `SelCrv`

command do you only get the original curve in your selection?

**Hiroo_Maruyama**#11

thanks,

I pasted your code in my python, but nurbs curve doesn’t appear. and error code doesn’t appear either…

now I use rhino5. The setting is wrong??

**Alain**(Alain Cormier) #12

Your screen capture with the printed `Id`

shows that it was added to the document. Forcing a redraw by moving things around doesn’t show it? Does running the `SelCrv`

command select it?

**Alain**(Alain Cormier) #14

Running the `SelCrv`

command only selected one curve? Not two: the original curve plus the new one?

**Hiroo_Maruyama**#15

Running the Selcrv command in rhino can select two curves, thanks.

but on the screen, i cannot see the new curve.(I cheched the display setting and show command, layer)

**Alain**(Alain Cormier) #16

If you run the `SelLast`

command followed by the menu: `View->Zoom->ZoomSelected`

do you see it?

**Hiroo_Maruyama**#17

**dale**(Dale Fugier) #21

Hi @Hiroo_Maruyama,

The code you posted works here in both Rhino 5 SR14 and Rhino 6 SR3.

If you are using Rhino 5 and are not using SR14, then I suggest you download and install the service release.

https://www.rhino3d.com/download/rhino/5/latest

– Dale