Question Finding world point of second cameras view of canvas

Ok, so I'm well out of my depth here. But ill try explain it the best that I can.

I've got the main camera (player) looking at a computer screen in game, this screen has a canvas on it and a render texture from a secondary camera that viewing the scene from a top down view.

What id like to do is have an object in the world space follow exactly to where the "in canvas" curser o, the in world screen is. Basically having a raycast from that location in world space so I can see what the curser is hovering over.

As you can see on the images, the screen view is showing the cursor in the middle of the
red box, however in the other image you can see the blue sphere is in a slightly different location.



This is the code i have, however I'm completely sure it doesn't work correctly.

Code (CSharp):

1. Vector2 mouseScreenPosition = Mouse.current.position.ReadValue();
2.                 screenPositon = mouseScreenPosition;
3.                 screenPositon.z = birdsEyeCam.nearClipPlane;
4.                 worldPosition = birdsEyeCam.ScreenToWorldPoint(screenPositon);
5.                 rayObj.transform.position = worldPosition;

Literally no idea how to even ask this question correctly.
Any help would be muchly appreciated.

 

The simple answer here is to use https://docs.unity3d.com/ScriptReference/Plane.Raycast.html or give the screen a collider and use a physics raycast. Just create the plane at the screen's position/orientation in the world.

 

I'm not entirely sure how to implement this Plane.Raycast code into my script. How would I necessarily position the ray object to the same position on the in-world computer screen using this?

 

I think technically you're asking how a mini map works, and how you can click on the mini map to move the camera to that position in the world. I'd look into a couple of those types of tutorials, to get some ideas.

 

Oh true! That actually is a great example. I'll give them a look over!