CSHARP

unity mouse click m

void Update()
    {
        if (Input.GetMouseButtonDown(0))
            Debug.Log("Pressed primary button.");

        if (Input.GetMouseButtonDown(1))
            Debug.Log("Pressed secondary button.");

        if (Input.GetMouseButtonDown(2))
            Debug.Log("Pressed middle click.");
    }

unity mouse click position

Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

RaycastHit hit = new RaycastHit();

if (Physics.Raycast(ray, out hit))
{
	return hit.point;
}

unity mouse click

if (Input.GetMouseButtonDown(1)){
	// do what you want
}

unity mouse click

//Triggers when object is clicked
private void OnMouseDown()
{
  //Code to trigger
}