Zoom in and Zoom out feature in Unity 3d using UI buttons

Question

How do I create the Zoom-in and Zoom-out feature in Unity-3d using UI button click?

Answer 1

Solution depends on your specific setup, but this should be a good starting point, if you're using an ortographic Camera . If you're using a perspective camera instead, you should move its Transform 's position forward or backwards. I'm also using Mathf.Clamp to restrict the zooming level to a specific range.

using UnityEngine;
using UnityEngine.UI;

public class Zoomer: MonoBehaviour
{
   public Button zoomInButton;
   public Button zoomOutButton;

   public float zoomDelta = 0.1f;

   public float minZoom;
   public float maxZoom;

   Camera cam;

   void Start()
   {
      cam = Camera.main;
   }

   void OnEnable()
   {
       zoomInButton.onClick.AddListener(delegate { Zoom(-zoomDelta); });
       zoomOutButton.onClick.AddListener(delegate { Zoom(zoomDelta); });
   }

   void Zoom(float value)
   {
      float v = Mathf.Clamp(
         cam.orthographicSize + value,
         minZoom,
         maxZoom
      );

      cam.orthographicSize = v;
   }
}