Get mouse position in active viewport + cplane coords

How to get the 2d - relative to the viewport windows and 3d coordinates of the active cplane?

Reason why would be custom object creation (not get, set style, but rather a scatter painter or similar)
the 2d would be to interact with Hud-style displayconduit elements.
(rhino5, c#, or similar)

AFAIK there is no example in C# but you would need the Viewport.GetPickTransform() if I'm not mistaken. (see below)

To transform a 2-D screen point to a 3-D world xy-plane point, you can do something like this:

Rhino.Display.RhinoView view = doc.Views.ActiveView;
Rhino.Geometry.Transform xform = view.ActiveViewport.GetTransform(
Rhino.Geometry.Point3d world_point = new Rhino.Geometry.Point3d(
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i don’t really understand what you mean dale, but i think i figured it out more or less:

RhinoView view = doc.Views.ActiveView;
RhinoViewport vp = view.ActiveViewport;

System.Drawing.Point p = vp.ScreenToClient(Cursor.Position);
Line l = vp.ClientToWorld(p); // this gives a point exactly over the cursor

I didn’t figure out yet what defines the depth of the point, but its a good start - and i think the code from dale could be the next step to bring the point to a plane

edit: just realized that my initial post was a bit vague on what i wanted to achieve: to get the coordinates that are shown in the lower left corner of rhino

This is exactly what my sample code shows how to do…

To simply get the cursor location, this seems to work:

screenPos = Rhino.UI.MouseCursor.Location;