Camera.main.ScreenToWorldPoint() Not Working

I have a 3D game and I am trying to make it so that it spawns a gameobject where I click with cam.ScreenToWorldPoint(mousePosition), but whenever I click it just inserts the game object at the position of the camera? Why is this and how can I fix it?

Code (CSharp):

1. void Update()
2.     {
3.         if (Input.GetKeyDown("mouse 0"))
4.         {
5.             Vector3 point = new Vector3();
6.  
7.  
8.             Vector3 mousePos = Input.mousePosition;
9.  
10.             point = Camera.main.ScreenToWorldPoint(mousePos);
11.  
12.             Instantiate(g, point, Quaternion.identity);
13.         }
14.     }

 

It's counter-intuitive, but you need to set the Z position as the distance from the camera.

Code (csharp):

1.  
2. Camera cam = Camera.main;
3.  
4. Vector3 mousePos = Input.mousePosition;
5. mousePos.z = cam.nearClipPlane;
6.  
7. point = cam.ScreenToWorldPoint(mousePos);
8.  

For a full 3D game with a rotatable camera, you'll probably want to use a Raycast eventually anyways.

 

Didn't you want something like this?

Code (CSharp):

1. private void Update()
2. {
3.    if(!Input.GetMouseButtonDown(0)) return;
4.    var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
5.    if (Physics.Raycast(ray, out var hit)) {
6.       Instantiate(g, hit.transform.position, Quaternion.identity);
7.    }
8. }

 

Thank you, this helped a lot.