2D camera zoom smoothing and limitations?

Questions & Answers
1

I have a working zoom function for my top down 2D game:

using UnityEngine;
using System.Collections;

public class ZoomFunction : MonoBehaviour {
	
	public float zoomSpeed = 20;
	
	void Update () {
		
		float scroll = Input.GetAxis ("Mouse ScrollWheel");
		if (scroll != 0.0f) 
		{
			Camera.main.orthographicSize -= scroll * zoomSpeed;
		}
		
	}
	
}

It works but it jumps in and out rather than being a smooth transition and I would like to set limitations to how far in or out the player can zoom. Any help/advice would be appreciated.

2

Use Mathf.Lerp() or Mathf.MoveTowards():

using UnityEngine;
using System.Collections;

public class ZoomFunction : MonoBehaviour {
	
	public float zoomSpeed = 1;
	public float targetOrtho;
	public float smoothSpeed = 2.0f;
	public float minOrtho = 1.0f;
	public float maxOrtho = 20.0f;

	void Start() {
		targetOrtho = Camera.main.orthographicSize;
	}
	
	void Update () {
		
		float scroll = Input.GetAxis ("Mouse ScrollWheel");
		if (scroll != 0.0f) {
			targetOrtho -= scroll * zoomSpeed;
			targetOrtho = Mathf.Clamp (targetOrtho, minOrtho, maxOrtho);
		}

		Camera.main.orthographicSize = Mathf.MoveTowards (Camera.main.orthographicSize, targetOrtho, smoothSpeed * Time.deltaTime);
	}
}