Resolved How to fade out object after some time on collision

Help I do not know how to change the color of the player gradually on collision to any object. I wrote a script and applied it to the player but it of course does what is say, but is limited to it.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class test : MonoBehaviour
6. {
7.     private void OnCollisionEnter2D(Collision2D collision)
8.     {
9.         GetComponent<SpriteRenderer>().color = new Color(255f, 255f, 255f, 0f); //Code works
10.         Debug.Log("Collision"); //Collision is true
11.     }
12. }

So, how do I make the alpha value (0f) decrease from 255 to 0 in 1-2 seconds?
How do I build up the code?
Thanks in advance

 

So first off, let me just note that Color in Unity works a bit differently than you are expecting. The values in Color range from 0 to 1, not 0 to 255. (If you really prefer 0 to 255, there is a separate type you can use called Color32 which is effectively interchangeable with Color. https://docs.unity3d.com/ScriptReference/Color32.html).

Now that's out of the way, this is a perfect use case for a Coroutine using Color.Lerp:

Code (CSharp):

1. public class test : MonoBehaviour {
2.     private void OnCollisionEnter2D(Collision2D collision) {
3.         Debug.Log("Collision"); //Collision is true
4.         StartCoroutine(FadeAlphaToZero(GetComponent<SpriteRenderer>(), 2f));
5.     }
6.  
7.     IEnumerator FadeAlphaToZero(SpriteRenderer renderer, float duration) {
8.         Color startColor = renderer.color;
9.         Color endColor = new Color(startColor.r, startColor.g, startColor.b, 0);
10.         float time = 0;
11.         while (time < duration) {
12.             time += Time.deltaTime;
13.             renderer.color = Color.Lerp(startColor, endColor, time/duration);
14.             yield return null;
15.         }
16.     }
17. }

The coroutine will run every frame for the duration you give it, and it will gradually fade the alpha value of your sprite to 0 from wherever it started.

 

Works like a charm. Thank you very much (^∇^)
I literary can imagine going through this searching the documentation for weeks, thinking code, watching tutorials. Phew, thank you once again.