Get mouse location y relative to player position z

Question

I'm trying to get the mouse y axis position on the screen from ScreenToWorldPoint but the problem is my camera is set to orthographic and has a angle of 25 on the x axis. I've setup a script to get the location of the mouse relative to the player and it works on the x axis but slowly goes out of sync on the y which I imagine is because of the camera angle as the player walks more and more up the screen?

Does anyone know how to get the mouse y location relative to the player position - the angle and height of the camera?

Answer 1

You are right that this is caused by the angle of the camera. ScreenToWorldPoint takes a ray from the camera to a point in the world a certain distance away (one of the parameters) but it is the same distance all the time, so it returns the y pos in world space taking that camera angle. What you want is a varying distance, since as objects higher in the y pos (according to the camera) are usually farther away.

To do this you need to cast your own rays out to a plane parallel to the world instead of the camera.

 // make a plane in the world relative to the player (replace with your own variables)
 Plane plane = new Plane(player.transform.up, player.transfrom.position);
 // create a ray from your mouse
 Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
 
 // cast ray from mouse to the plane we made to get that varied distance mentioned earlier
 if(plane.Raycast(ray, out float distance)) {
     // get point in the world with that distance
     var point = ray.GetPoint(distance);
 }

That point should be the correct spot in world space where your mouse is, relative to the players z pos (since that is the how the plane was made).

Get mouse location y relative to player position z

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