How to make a cube shrink over time

This works on a simple cube I made. It decreases the size evenly ( x,y,z) .Change the growRate to a positive number to increase size. The lrger the digit ( whether positive or negative ) the faster it grows or shrinks

 using UnityEngine;
 using System.Collections;
 
 public class shrink : MonoBehaviour {
 
     public GameObject cube;
     public float growRate = -3f;
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
         cube.transform.localScale  += new Vector3(0.1F, .1f, .1f) * growRate * Time.deltaTime;
     }
 }
 



   

Hello there,

This should help you out:

 using System.Collections;
 using UnityEngine;
 
 public class Test : MonoBehaviour
 {
     private void Start()
     {
         //Call the function giving it a target scale (Vector3) and a duration (float).
         ScaleToTarget(new Vector3(10.0f, 2.5f, 7.5f), 2.5f);
     }
 
     public void ScaleToTarget(Vector3 targetScale, float duration)
     {
         StartCoroutine(ScaleToTargetCoroutine(targetScale, duration));
     }
 
     private IEnumerator ScaleToTargetCoroutine(Vector3 targetScale, float duration)
     {
         Vector3 startScale = transform.localScale;
         float timer = 0.0f;
 
         while(timer < duration)
         {
             timer += Time.deltaTime;
             float t = timer / duration;
             //smoother step algorithm
             t = t * t * t * (t * (6f * t - 15f) + 10f);
             transform.localScale = Vector3.Lerp(startScale, targetScale, t);
             yield return null;
         }
 
         yield return null;
     }
 }

Put that script on your cube, and it will shrink to target scale with a nice smoothing effect on start. It's up to you then to call ScaleToTarget() from other scripts whenever you require.

More about smoothing formulas HERE

Hope that helps!

~LegendBacon