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OnMouseDrag is called when the user has clicked on a GUIElement or Collider and is still holding down the mouse.

OnMouseDrag is called every frame while the mouse is down.

	// Darken the material color while user holds down the mouse.

function OnMouseDrag () { renderer.material.color -= Color.white * Time.deltaTime; }
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void OnMouseDrag() {
        renderer.material.color -= Color.white * Time.deltaTime;
import UnityEngine
import System.Collections

public class ExampleClass(MonoBehaviour):

	def OnMouseDrag() as void:
		renderer.material.color -= (Color.white * Time.deltaTime)

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

OnMouseDrag 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.