Looking for Angle(point1, point2, plane) equivalent in .net

I’m looking for the .net equivalent of RhinoScript’s function Angle(point1, point2, plane) but I can’t find it.
Any idea?

there is a rhinocommon method that you could use:
maybe something like this?

v1 = Rhino.Geometry.Vector3d(pt1 - pl.Origin)
v2 = Rhino.Geometry.Vector3d(pt2 - pl.Origin)

a = Rhino.Geometry.Vector3d.VectorAngle(v1, v2)

Thanks @chanley, I’ll try this when I have the time, although I’m not sure if the result would be the same.

By the way, since origin is zero, I think we can directly cast the points as vectors:
a = Rhino.Geometry.Vector3d.VectorAngle(new vector(Pt1),new vector(Pt2))

I’ll give you a feedback later

ah, i think you are correct. My answer is not what you are looking for! I didn’t fully read what that function actually returned.
For what it’s worth, this is is the rhinocommon/python code behind the rs function you initially posted about.
(it’s taken from the utility.py file, which is located on your computer here: (version may vary)
%USERPROFILE%\AppData\Roaming\McNeel\Rhinoceros\6.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\rhinoscript)

def Angle(point1, point2, plane=True):
    """Measures the angle between two points
      point1, point2 (point): the input points
      plane (bool, optional): Boolean or Plane
        If True, angle calculation is based on the world coordinate system.
        If False, angle calculation is based on the active construction plane
        If a plane is provided, angle calculation is with respect to this plane
      tuple(tuple(number, number), number, number, number, number): containing the following elements if successful
        element 0 = the X,Y angle in degrees
        element 1 = the elevation
        element 2 = delta in the X direction
        element 3 = delta in the Y direction
        element 4 = delta in the Z direction
      None: if not successful
      import rhinoscriptsyntax as  rs
      point1 = rs.GetPoint("First  point")
      if point1:
          point2  = rs.GetPoint("Second point")
          if point2:
              angle  = rs.Angle(point1, point2)
              if  angle: print "Angle: ", angle[0]
    See Also:
    pt1 = coerce3dpoint(point1)
    if pt1 is None:
        pt1 = coercerhinoobject(point1)
        if isinstance(pt1, Rhino.DocObjects.PointObject): pt1 = pt1.Geometry.Location
        else: pt1=None
    pt2 = coerce3dpoint(point2)
    if pt2 is None:
        pt2 = coercerhinoobject(point2)
        if isinstance(pt2, Rhino.DocObjects.PointObject): pt2 = pt2.Geometry.Location
        else: pt2=None
    point1 = pt1
    point2 = pt2
    if point1 is None or point2 is None: return scriptcontext.errorhandler()
    vector = point2 - point1
    x = vector.X
    y = vector.Y
    z = vector.Z
    if plane!=True:
        plane = coerceplane(plane)
        if plane is None:
            plane = scriptcontext.doc.Views.ActiveView.ActiveViewport.ConstructionPlane()
        vfrom = point1 - plane.Origin
        vto = point2 - plane.Origin
        x = vto * plane.XAxis - vfrom * plane.XAxis
        y = vto * plane.YAxis - vfrom * plane.YAxis
        z = vto * plane.ZAxis - vfrom * plane.ZAxis
    h = math.sqrt( x * x + y * y)
    angle_xy = math.degrees( math.atan2( y, x ) )
    elevation = math.degrees( math.atan2( z, h ) )
    return angle_xy, elevation, x, y, z