instantiate object at mouse position

Questions & Answers
1

Hello

Could anyone please explain me how i have to instantiate a prefab at the current mouse position? I already know how to instantiate prefabs but what i don’t know is how to instantiate them at the currrent mouse position.

Thank you.

2

Get the current mouse position with Input.mousePosition, then convert that position to world space using Camera.ScreenToWorldPoint.

EDIT: Example in C#:

void Update () 
    {
    if (Input.GetButtonDown("Fire1")) 
        {
        Vector3 mousePos = Input.mousePosition;
        mousePos.z = 2.0f;       // we want 2m away from the camera position

        Vector3 objectPos = Camera.current.ScreenToWorldPoint(mousePos);
        Instantiate(yourObject, objectPos, Quaternion.identity);
        }
    }
4

mousePos.z = 2.0; is this not float??
i mean: mousePos.z = 2.0f;

5

For anyone attempting to do this in C# is quite simple & works quite fine as of 4/13/20…

private Vector3 mousePos;
private Vector3 objectPos;
public GameObject yourPrefab;

void Update ()
{
	if(Input.GetButtonDown("Fire1"))
	{
		mousePos = Input.mousePosition;
		mousePos.z = 2.0f;
		objectPos = Camera.main.ScreenToWorldPoint(mousePos);
		Instantiate(yourPrefab, objectPos, Quaternion.identity);
	}
}

}

3

I keep getting a error when i press the mouse:

NullReferenceException
UnityEngine.Camera.ScreenToWorldPoint (Vector3 position) (at C:/BuildAgent/work/6bc5f79e0a4296d6/Runtime/ExportGenerated/Editor/Graphics.cs:650)

Do you have any idea what this is?

This is my sript:

var testObject : Transform;

function Update () 
    {
    if (Input.GetButtonDown ("Fire1")) 
        {
        var mousePos = Input.mousePosition;
        mousePos.z = 2.0;       // we want 2m away from the camera position

        var objectPos = Camera.current.ScreenToWorldPoint(mousePos);
		
        var myObject= Instantiate(testObject, objectPos, Quaternion.identity);
        }
    }