# Curve.CreateFilletCurves examples

Examples for [CreateFilletCurves](https://developer.rhino3d.com/api/rhinocommon/type/rhino.geometry.curve/createfilletcurves.md) in Rhino.Geometry.Curve.

## C#

```cs
using Rhino;
using Rhino.Commands;
using Rhino.Geometry;
using Rhino.Input;
using Rhino.DocObjects;
using Rhino.Input.Custom;

namespace examples_cs
{
  public class FilletCurvesCommand : Command
  {
    public override string EnglishName { get { return "csFilletCurves"; } }

    protected override Result RunCommand(RhinoDoc doc, RunMode mode)
    {
      var gc1 = new GetObject();
      gc1.DisablePreSelect();
      gc1.SetCommandPrompt("Select first curve to fillet (close to the end you want to fillet)");
      gc1.GeometryFilter = ObjectType.Curve;
      gc1.GeometryAttributeFilter = GeometryAttributeFilter.OpenCurve;
      gc1.Get();
      if (gc1.CommandResult() != Result.Success)
        return gc1.CommandResult();
      var curve1_obj_ref = gc1.Object(0);
      var curve1 = curve1_obj_ref.Curve();
      if (curve1 == null) return Result.Failure;
      var curve1_point_near_end = curve1_obj_ref.SelectionPoint();
      if (curve1_point_near_end == Point3d.Unset)
        return Result.Failure;

      var gc2 = new GetObject();
      gc2.DisablePreSelect();
      gc2.SetCommandPrompt("Select second curve to fillet (close to the end you want to fillet)");
      gc2.GeometryFilter = ObjectType.Curve;
      gc2.GeometryAttributeFilter = GeometryAttributeFilter.OpenCurve;
      gc2.Get();
      if (gc2.CommandResult() != Result.Success)
        return gc2.CommandResult();
      var curve2_obj_ref = gc2.Object(0);
      var curve2 = curve2_obj_ref.Curve();
      if (curve2 == null) return Result.Failure;
      var curve2_point_near_end = curve2_obj_ref.SelectionPoint();
      if (curve2_point_near_end == Point3d.Unset)
        return Result.Failure;

      double radius = 0;
      var rc = RhinoGet.GetNumber("fillet radius", false, ref radius);
      if (rc != Result.Success) return rc;

      var join = false;
      var trim = true;
      var arc_extension = true;
      var fillet_curves = Curve.CreateFilletCurves(curve1, curve1_point_near_end, curve2, curve2_point_near_end, radius,
        join, trim, arc_extension, doc.ModelAbsoluteTolerance, doc.ModelAngleToleranceDegrees);
      if (fillet_curves == null /*|| fillet_curves.Length != 3*/)
        return Result.Failure;

      foreach(var fillet_curve in fillet_curves)
        doc.Objects.AddCurve(fillet_curve);
      doc.Views.Redraw();
      return rc;
    }
  }
}
```

## Python

```py
from Rhino import *
from Rhino.Commands import *
from Rhino.Geometry import *
from Rhino.Input import *
from Rhino.DocObjects import *
from Rhino.Input.Custom import *
from scriptcontext import doc

def RunCommand():
  gc1 = GetObject()
  gc1.DisablePreSelect()
  gc1.SetCommandPrompt("Select first curve to fillet (close to the end you want to fillet)")
  gc1.GeometryFilter = ObjectType.Curve
  gc1.GeometryAttributeFilter = GeometryAttributeFilter.OpenCurve
  gc1.Get()
  if gc1.CommandResult() != Result.Success:
    return gc1.CommandResult()
  curve1_obj_ref = gc1.Object(0)
  curve1 = curve1_obj_ref.Curve()
  if curve1 == None: return Result.Failure
  curve1_point_near_end = curve1_obj_ref.SelectionPoint()
  if curve1_point_near_end == Point3d.Unset:
    return Result.Failure

  gc2 = GetObject()
  gc2.DisablePreSelect()
  gc2.SetCommandPrompt("Select second curve to fillet (close to the end you want to fillet)")
  gc2.GeometryFilter = ObjectType.Curve
  gc2.GeometryAttributeFilter = GeometryAttributeFilter.OpenCurve
  gc2.Get()
  if gc2.CommandResult() != Result.Success:
    return gc2.CommandResult()
  curve2_obj_ref = gc2.Object(0)
  curve2 = curve2_obj_ref.Curve()
  if curve2 == None: return Result.Failure
  curve2_point_near_end = curve2_obj_ref.SelectionPoint()
  if curve2_point_near_end == Point3d.Unset:
    return Result.Failure

  radius = 0.0
  rc, radius = RhinoGet.GetNumber("fillet radius", False, radius)
  if rc != Result.Success: return rc

  fillet_curve = Curve.CreateFilletCurves(curve1, curve1_point_near_end, curve2, curve2_point_near_end, radius,
    True, True, True, doc.ModelAbsoluteTolerance, doc.ModelAngleToleranceDegrees)
  if fillet_curve == None or fillet_curve.Length != 1:
    return Result.Failure

  doc.Objects.AddCurve(fillet_curve[0])
  doc.Views.Redraw()
  return rc

if __name__ == "__main__":
  RunCommand()
```

## VB.NET

```vbnet
Imports Rhino
Imports Rhino.Commands
Imports Rhino.Geometry
Imports Rhino.Input
Imports Rhino.DocObjects
Imports Rhino.Input.Custom

Namespace examples_vb
  Public Class FilletCurvesCommand
    Inherits Command
    Public Overrides ReadOnly Property EnglishName() As String
      Get
        Return "vbFilletCurves"
      End Get
    End Property

    Protected Overrides Function RunCommand(doc As RhinoDoc, mode As RunMode) As Result
      Dim gc1 = New GetObject()
      gc1.DisablePreSelect()
      gc1.SetCommandPrompt("Select first curve to fillet (close to the end you want to fillet)")
      gc1.GeometryFilter = ObjectType.Curve
      gc1.GeometryAttributeFilter = GeometryAttributeFilter.OpenCurve
      gc1.[Get]()
      If gc1.CommandResult() <> Result.Success Then
        Return gc1.CommandResult()
      End If
      Dim curve1_obj_ref = gc1.[Object](0)
      Dim curve1 = curve1_obj_ref.Curve()
      If curve1 Is Nothing Then
        Return Result.Failure
      End If
      Dim curve1_point_near_end = curve1_obj_ref.SelectionPoint()
      If curve1_point_near_end = Point3d.Unset Then
        Return Result.Failure
      End If

      Dim gc2 = New GetObject()
      gc2.DisablePreSelect()
      gc2.SetCommandPrompt("Select second curve to fillet (close to the end you want to fillet)")
      gc2.GeometryFilter = ObjectType.Curve
      gc2.GeometryAttributeFilter = GeometryAttributeFilter.OpenCurve
      gc2.[Get]()
      If gc2.CommandResult() <> Result.Success Then
        Return gc2.CommandResult()
      End If
      Dim curve2_obj_ref = gc2.[Object](0)
      Dim curve2 = curve2_obj_ref.Curve()
      If curve2 Is Nothing Then
        Return Result.Failure
      End If
      Dim curve2_point_near_end = curve2_obj_ref.SelectionPoint()
      If curve2_point_near_end = Point3d.Unset Then
        Return Result.Failure
      End If

      Dim radius As Double = 0
      Dim rc = RhinoGet.GetNumber("fillet radius", False, radius)
      If rc <> Result.Success Then
        Return rc
      End If

      Dim fillet_curve = Curve.CreateFilletCurves(curve1, curve1_point_near_end, curve2, curve2_point_near_end, radius, True, _
        True, True, doc.ModelAbsoluteTolerance, doc.ModelAngleToleranceDegrees)
      If fillet_curve Is Nothing OrElse fillet_curve.Length <> 1 Then
        Return Result.Failure
      End If

      doc.Objects.AddCurve(fillet_curve(0))
      doc.Views.Redraw()
      Return rc
    End Function
  End Class
End Namespace
```