Rotate object about x-axis with mouse like in editor

Questions & Answers
1

I want to rotate an object like one can rotate an object in the editor.

The user performs a click on the object (anywhere). By holding the mouse button down she is then able to rotate the wheel (see image) about its x-axis. The rotation should feel like the rotation one can perform in the unity editor.

How can I achieve that? Any Help is appreciated :)!

9046-unity.jpg

EDIT:
The coordinates of the mouse position are given and can be used as Vector2 MousePos.

2

The simplest is to use Input.GetAxis():

var sensitivity = 5;

function OnMouseDrag() {
    transform.Rotate(Vector3(sensitivity * Input.GetAxis("Mouse Y"), 0, 0));
}

But you can use mousePos. I’ve use ScreenToViewportPoint() to make the code resolution indenpendent. It is not necessary. Replace with direct assignment and adjust the sensivity way down.

var sensitivity = 300.0;
  
private var lastPos : Vector3;

function OnMouseDown() {
    lastPos = Camera.main.ScreenToViewportPoint(Input.mousePosition);
    }

function OnMouseDrag() {
    var pos = Camera.main.ScreenToViewportPoint(Input.mousePosition);
  	transform.Rotate((pos.y - lastPos.y)*sensitivity, 0, 0);
  	lastPos = pos;
}