'out' parameters with rhino common methods

[PaulM]

Hello,

I'm trying to use the rhino common Rhino.Geometry.Mesh.ClosestPoint (Point3d, Point3d, Vector3d, Double) method.

The second Point3d and Vector3d arguments are output parameters. Would anyone be able to help me with the syntax for using this method (and other overloaded methods with output parameters) in RhinoPython?

Paul

[Goswin]

in this case Ironpython returns a tuple, the second member in the tuple is your out parameter.

[Goswin]

like here: https://github.com/mcneel/rhinopytho...t/mesh.py#L194

[PaulM]

Thanks Goswin, I would have expected a tuple back, but it doesn't in this case, I think because the method is overloaded - it accepts input in both ClosestPoint (Point3d, Point3d, Vector3d, Double) and ClosestPoint(Point3d) forms.

It seems IronPython can be persuaded to accept 'out' parameters as arguments defined with clr.Reference[Type]()

The example below will return a mesh closest point, normal and face index.

Paul

24Sep12 - Fixed, see goswin's comment below

python Code:

import Rhino.Geometry as rg
from clr import Reference
 
def MeshClosestPointNormal(mesh, pnt, maxDist=0.0):
    """for a test point and a mesh, return the closest point, normal and face
       index on that mesh.
    input:
       mesh - guid of a mesh
       pnt - test Point3d
    returns:
       tuple containing (closest_point, normal, faceindex)
    """
    ret_pnt = rg.Point3d(0,0,0)
    ret_pnt = Reference[ret_pnt.GetType()]()
    ret_nrm = rg.Vector3d(0,0,0)
    ret_nrm = Reference[ret_nrm.GetType()]()
    face_idx = mesh.ClosestPoint(pnt, ret_pnt, ret_nrm, maxDist)
    return (ret_pnt.Value, ret_nrm.Value, face_idx)

[Goswin]

Thanks Paul, I did not know this solution for overloaded methods.
don't you need to do :
return (ret_pnt.Value , ret_nrm.Value , face_idx)
like described here:
http://stackoverflow.com/questions/8...-specific-type