[Maya-Python] Python API method of setAttr -type "nurbsCurve"

[Marcus Ottosson]

Hi all,

I’m trying to achieve this..

createNode transform -n "myCurve";
createNode nurbsCurve -n "myCurveShape" -p "myCurve";
setAttr "myCurveShape.cached" -type "nurbsCurve" 
    3 2 no no 3
    7 -2 -1 0 1 2 3 4
    5
    1.0 0.0 0.0
    1.0 0.0 1.0
    0.0 0.0 1.0
    -1.0 0.0 1.0
    -1.0 0.0 -1.0
    ;

..using API (any version, Maya 2015+)..

from maya.api import OpenMaya as om

mfn = om.MFnDagNode()
parent = mfn.create("transform", "myCurve")
shape = mfn.create("nurbsCurve", "myCurveShape", parent=parent)
attr = mfn.findPlug("cached", False)
attr.set...(?)

Does anyone know how to set this attribute?

Best,
Marcus

​

[Serguei Kalentchouk]

Hi Marcus,

It would be something like this (pseudo code):

data = MFnNurbsSurfaceData()
obj = data.create()
surffn = MFnNurbsSurface(obj)
surffn.create(...)
plug.set(obj)

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[Marcus Ottosson]

Genius!

from maya import OpenMaya as om1

def setNurbsCurve(shape, points, degree=1, form=om1.MFnNurbsCurve.kOpen):
    degree = min(3, max(1, degree))

    cvs = om1.MPointArray()
    curveFn = om1.MFnNurbsCurve()
    data = om1.MFnNurbsCurveData()
    mobj = data.create()

    for point in points:
        cvs.append(om1.MPoint(*point))

    curveFn.createWithEditPoints(cvs,
                                 degree,
                                 form,
                                 False,
                                 False,
                                 True,
                                 mobj)

    shapeFn = om1.MFnDagNode(shape)
    plug = shapeFn.findPlug("cached")
    plug.setMObject(mobj)

mfn = om1.MFnDagNode()
parent = mfn.create("transform")
shape = mfn.create("nurbsCurve", "shape", parent)
setNurbsCurve(shape, points=((0, 0, 0), (0, 1, 0), (0, 2, 0)))

Now it makes sense what those *Data members are for; previously, I’ve passed a transform as argument for parent for the createWithEditPoints command, which would create a new curve and automatically parent it to that transform. But one of the issues I was having was that I wasn’t able to give that shape a name. But with this approach, it makes sense as that function probably isn’t designed to actually both create the geometry and the node, in which case I can create the node elsewhere and set the attribute like this.

Thanks Serguei!

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