partial class Examples
{
  public static Rhino.Commands.Result UnrollSurface2(Rhino.RhinoDoc doc)
  {
    const ObjectType filter = Rhino.DocObjects.ObjectType.Brep | Rhino.DocObjects.ObjectType.Surface;
    Rhino.DocObjects.ObjRef objref;
    Result rc = Rhino.Input.RhinoGet.GetOneObject("Select surface or brep to unroll", false, filter, out objref);
    if (rc != Rhino.Commands.Result.Success)
      return rc;
    Rhino.Geometry.Unroller unroll=null;
    Rhino.Geometry.Brep brep = objref.Brep();
    Rhino.Geometry.Mesh mesh=null;
    if (brep != null)
    {
      unroll = new Rhino.Geometry.Unroller(brep);
      mesh = brep.Faces[0].GetMesh(Rhino.Geometry.MeshType.Render);
    }
    else
    {
      Rhino.Geometry.Surface srf = objref.Surface();
      if (srf != null)
      {
        unroll = new Rhino.Geometry.Unroller(srf);
      }
    }
    if (unroll == null || mesh==null)
      return Rhino.Commands.Result.Cancel;

    unroll.AddFollowingGeometry(mesh.Vertices.ToPoint3dArray());

    unroll.ExplodeOutput = false;
    Rhino.Geometry.Curve[] curves;
    Rhino.Geometry.Point3d[] points;
    Rhino.Geometry.TextDot[] dots;
    unroll.PerformUnroll(out curves, out points, out dots);

    // change the mesh vertices to the flattened form and add it to the document
    if( points.Length == mesh.Vertices.Count )
    {
      for( int i=0; i<points.Length; i++ )
        mesh.Vertices.SetVertex(i, points[i]);
      mesh.Normals.ComputeNormals();
    }
    doc.Objects.AddMesh(mesh, objref.Object().Attributes);
    doc.Views.Redraw();
    return Rhino.Commands.Result.Success;
  }
}

import Rhino
import scriptcontext

def UnrollSurface2():
    filter = Rhino.DocObjects.ObjectType.Brep | Rhino.DocObjects.ObjectType.Surface
    rc, objref = Rhino.Input.RhinoGet.GetOneObject("Select surface or brep to unroll", False, filter)
    if rc!=Rhino.Commands.Result.Success: return rc;

    unroll = Rhino.Geometry.Unroller(objref.Geometry())
    mesh = objref.Brep().Faces[0].GetMesh(0)
    if not mesh: return Rhino.Commands.Result.Cancel

    unroll.AddFollowingGeometry(mesh.Vertices.ToPoint3dArray())
    unroll.ExplodeOutput = False
    breps, curves, points, dots = unroll.PerformUnroll()
    # change the mesh vertices to the flattened form and add it to the document
    if points.Length==mesh.Vertices.Count:
        for i, point in enumerate(points): mesh.Vertices.SetVertex(i, point)
        mesh.Normals.ComputeNormals()
    scriptcontext.doc.Objects.AddMesh(mesh, objref.Object().Attributes)
    scriptcontext.doc.Views.Redraw()
    return Rhino.Commands.Result.Success

if __name__=="__main__":
    UnrollSurface2()