Resolved Keep an object in the same place on the screen by moving it on the Y axis

Hi everyone.
In my editor I work in GameView (in edit mode) moving 3D objects with custom controls.
I'm trying to achieve the following:


When I move the plane on the Y axis it obviously keeps x and z constant.


Instead, I would need the x and z axes to change as well so that the vertex of the plane always appears to be in the same position on the screen.



I tried to use

WorldToScreenPoint 

and then

ScreenPointToRay 

but without success.
Do you have any suggestions to put me on the right track?

 

Alright, I found a satisfactory solution. Planes are meshes that I create, so I have their vertices.
First, I store the vertices with

WorldToScreenPoint 

in a list.

Code (CSharp):

1. List<Vector3> ShapeVertices = new List<Vector3>();
2. int Size = MyShape.Count;
3. for (int i = 0; i <= listSize - 1; i++) {
4.   ShapeVertices.Add(cam.WorldToScreenPoint(MyShape[i]));
5. }

Then I iterate again all the vertices adding or subtracting, according to the direction of the plane, a small value to Y.

Code (CSharp):

1. for (int i = 0; i <= listSize - 1; i++) {
2.   Vector3 Vertices = MyShape[i];
3.   Vertices.y += 0.1f;
4.   // or Vertices.y -= 0.1f;
5.   MyShape[i] = Vertices;
6. }

Now I create a new plane at the Y level of the modified position of the shape.

Code (CSharp):

1. Plane plane = new Plane(Vector3.up, new Vector3(0.0f, MyShape[0].y, 0.0f));

And finally I use

Raycast

with

ScreenPointToRay

.

Code (CSharp):

1. float enter = 0.0f;
2. Ray ray;
3. for (int i = 0; i < ShapeVertices.Count; i++) {
4.   ray = cam.ScreenPointToRay(ShapeVertices[i]);
5.   if (plane.Raycast(ray, out enter)) {
6.     MyShape[i] = ray.GetPoint(enter);
7.   }
8. }

Now the new vertices are exactly where they were on the screen before changing the Y-axis.
From here, I just have to delete the old mesh and create the new one.

 

Out of curiosity, what are you trying to accomplish?

 

It's for a project I'm working on.
it's a bit long to explain, but what I need is that the camera always frames the mesh of the same apparent starting shape and size, regardless of whether the mesh is moved on the Y axis
Actually the third picture I posted above doesn't exactly reflect what's going on. The four vertices, by changing their position, also change the size of the mesh, and the final result, with a fixed camera, will always be like the first image.