How do you add a power gauge to a shooting script.

Questions & Answers
1

Hi I’ve got a shooting script (below) attached to the camera. It fires a ball prefab but what I want it to do is when I hold the shooting button(left mouse button) down, it charges the shot so when I release the mouse button it fires the ball prefab with greater power.
Here’s the shooting script.
using UnityEngine;
using System.Collections;

public class Shooter : MonoBehaviour {

public Rigidbody bullet;  
public float power = 1500f;  
public float moveSpeed = 2f; 

void Update (){
	if(Input.GetButtonUp("Fire1")){       

	Rigidbody instance = Instantiate(bullet, transform.position, transform.rotation) as Rigidbody;     

	Vector3 fwd = transform.TransformDirection(Vector3.forward);   
	instance.AddForce(fwd * power);
	}
 }

}

2

public float maxPower;
public float powerUpSpeed = 20;

if(Input.GetButton("Fire1")){    
     if(power < maxPower) {
              power += Time.deltaTime * powerUpSpeed;
     }
}

In your GetButtonUp function, which releases the ball, you set the power to zero again.