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RhinoViewportGetTransform Method

Gets a transform from origin coordinate system to a target coordinate system.

Namespace:  Rhino.Display
Assembly:  RhinoCommon (in RhinoCommon.dll)
public Transform GetTransform(
	CoordinateSystem sourceSystem,
	CoordinateSystem destinationSystem


Type: Rhino.DocObjectsCoordinateSystem
The origin coordinate system.
Type: Rhino.DocObjectsCoordinateSystem
The target coordinate system.

Return Value

Type: Transform
4x4 transformation matrix (acts on the left) Identity matrix is returned if this function fails.
using Rhino;
using Rhino.Commands;
using Rhino.DocObjects;
using System;

namespace examples_cs
  public class PointAtCursorCommand : Command
    public override string EnglishName { get { return "csPointAtCursor"; } }

    public static extern bool GetCursorPos(out System.Drawing.Point point);

    public static extern bool ScreenToClient(IntPtr hWnd, ref System.Drawing.Point point);

    protected override Result RunCommand(RhinoDoc doc, RunMode mode)
      var result = Result.Failure;
      var view = doc.Views.ActiveView;
      if (view == null) return result;

      System.Drawing.Point windows_drawing_point;
      if (!GetCursorPos(out windows_drawing_point) || !ScreenToClient(view.Handle, ref windows_drawing_point))
        return result;

      var xform = view.ActiveViewport.GetTransform(CoordinateSystem.Screen, CoordinateSystem.World);
      var point = new Rhino.Geometry.Point3d(windows_drawing_point.X, windows_drawing_point.Y, 0.0);
      RhinoApp.WriteLine("screen point: ({0})", point);
      RhinoApp.WriteLine("world point: ({0})", point);
      result = Result.Success;
      return result;
Version Information

Rhino for Mac

Supported in: 5.4

Rhino for Windows

Supported in: 6.2
See Also