[Flash or blink] uses - turning renderer on/off 4 time per seconds to show blink or flash-like animation. this continues for long time coz of i=1000 . the object using blink is meant to be destroyed. #manyuses

flash

/// <summary>
	/// flash the product renderer to help player pick up this object asap.
	/// </summary>
	private bool isFlashing = false;
	IEnumerator flash() {

		if(isFlashing)
			yield break;
		isFlashing = true;

		while(isFlashing) {
			for(int i = 0; i < 1000; i++) {
				//GetComponent<Renderer>().material.color = new Color(1,1,1,0.5f);
				GetComponent<Renderer>().enabled = false;
				yield return new WaitForSeconds(0.25f);
				//GetComponent<Renderer>().material.color = new Color(1,1,1,1);
				GetComponent<Renderer>().enabled = true;
				yield return new WaitForSeconds(0.25f);
			}
			yield return 0;
		}

	}