protected override Result RunCommand(RhinoDoc doc, RunMode mode) { Rhino.DocObjects.ObjectType filter = Rhino.DocObjects.ObjectType.Mesh; Rhino.DocObjects.ObjRef objref = null; Rhino.Commands.Result rc = Rhino.Input.RhinoGet.GetOneObject("Select mesh to contour", false, filter, out objref); if (rc != Rhino.Commands.Result.Success || objref == null) { return(rc); } Rhino.Geometry.Mesh mesh = objref.Geometry() as Rhino.Geometry.Mesh; if (null == mesh) { return(Rhino.Commands.Result.Failure); } Rhino.Geometry.BoundingBox bbox = mesh.GetBoundingBox(false); Rhino.Geometry.Point3d start_pt = bbox.Corner(true, true, true); Rhino.Geometry.Point3d end_pt = bbox.Corner(false, true, true); double interval = start_pt.DistanceTo(end_pt) / 10; Rhino.Geometry.Curve[] curves = Rhino.Geometry.Mesh.CreateContourCurves(mesh, start_pt, end_pt, interval); if (null != curves && curves.Length > 0) { for (int i = 0; i < curves.Length; i++) { doc.Objects.AddCurve(curves[i]); } doc.Views.Redraw(); } return(Result.Success); }