OnMouseDown is called when the user has pressed the mouse button while over the GUIElement or Collider.

This event is sent to all scripts of the Collider or GUIElement.

	// Loads the level named "SomeLevel" as a response
	// to the user clicking on the object
	function OnMouseDown () {
		Application.LoadLevel ("SomeLevel");
	}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void OnMouseDown() {
        Application.LoadLevel("SomeLevel");
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def OnMouseDown() as void:
		Application.LoadLevel('SomeLevel')

This function is not called on objects that belong to Ignore Raycast layer.

OnMouseDown can be a co-routine, simply use the yield statement in the function. This event is sent to all scripts attached to the Collider or GUIElement.