Screen point to world xz plane or world zy plane in c#

Rhino Developer
1

Hi:
Rhino.Display.RhinoView view = doc.Views.ActiveView;
Rhino.Geometry.Transform xform = view.ActiveViewport.GetTransform(
Rhino.DocObjects.CoordinateSystem.Screen,
Rhino.DocObjects.CoordinateSystem.World
);
Rhino.Geometry.Point3d world_point = new Rhino.Geometry.Point3d(
screen_point.X,
screen_point.Y,
0.0
);
world_point.Transform(xform);

this core cant transform screen point to world xy plane, it is any way to tranform screen point to wold xz plane or world yz plane?

2

If you want to transform some from one coordinate system to another (e.g. from world xy-plane to construction plane or vise versa), then create a change of basis transformation - Transform.ChangeBasis.

Here is an example:
https://github.com/dalefugier/SampleCsCommands/blob/master/SampleCsBoundingBox.cs

3

Think you@dale, I get your means.

4

Hi Dale,

Do you have this updated .cs file? I try to search on your github while there isn’t…

thx

5
6

Thank you Dale for your prompt reply.

What I understood is that this method GetObject requires a mouse click, right? What if I just want to track the location of the cursor?

I have something similar to @pythonuser which can successfully track the cursor. While I am wondering why there is a “gap”… between the cursor and the point(see below gif)… Could you give me some suggestions?

    //current viewport
    var view = doc.Views.ActiveView;
    //xform matrix
    var xform = view.ActiveViewport.GetTransform(Rhino.DocObjects.CoordinateSystem.Screen, Rhino.DocObjects.CoordinateSystem.World);
    //cursor（screen coordinate system）
    var point = new Rhino.Geometry.Point3d(Rhino.UI.MouseCursor.Location.X, Rhino.UI.MouseCursor.Location.Y, 0.0);
    //transform
    point.Transform(xform);

    Line cursorToOrigin = new Line(point, new Point3d(0, 0, 0));

    A = point;
    B = cursorToOrigin;

cursor
cursor629×610 171 KB

7

Why? What problem are you trying to solve?

– Dale

8

I want an instance of Point3d at where my cursor is. Apparently they are not overlapped right now

9

Is there any reason you don’t just use a GetPoint object?

– Dale

10

Hi Dale,
thanks again for the prompt reply. I want to create a sort of interaction between the cursor and Rhino. GetPoint is a solution while it requires user’s input through Rhino console. I think the “cursor” way is more smooth🤔