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Question by ENDAS_ORIGINAL · Apr 26, 2018 at 03:13 PM · collisioncolorcolor changeblackred

How to change material color for certain time?

Hello, I have a 2D hierarchical stickman character, when it collides with gameobject with tag enemy I want it to change color to red but just for small period of time (for example 0.25 sec.) and then turn it back black. I have no idea how to make it work, I tried to make it with color lerp but it doesn't worked. This is my code, if can anyone make it work i would be very thankful :)

     void Start() {
         foreach (SpriteRenderer sr in GetComponentsInChildren<SpriteRenderer>()) {
             sr.material.color = Color.black;
             gameObject.GetComponent<Renderer> ().material.color = Color.black;     
         }
     }
 
     void OnCollisionEnter2D (Collision2D coll) {
         if (coll.gameObject.tag == "enemy") {
             foreach (SpriteRenderer sr in GetComponentsInChildren<SpriteRenderer>()) {
                 sr.material.color = Color.red;
                 gameObject.GetComponent<Renderer> ().material.color = Color.red;     
                      //now I need to make it red just for specified time and then again black...            
                     }
         }
    }
 



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Answer by Hellium · Apr 26, 2018 at 03:27 PM

You will need coroutines to do so.

Either create a dedicated function:

     System.Collections.IEnumerator OnCollisionEnter2D( Collision2D coll )
     {
         if ( coll.gameObject.tag == "enemy" )
         {
             foreach ( SpriteRenderer sr in GetComponentsInChildren<SpriteRenderer>() )
             {
                 StartCoroutine( SwitchColor( gameObject.GetComponent<Renderer>(), Color.red ) ) ; 
                 StartCoroutine( SwitchColor( sr, Color.red ) ) ;  
             }
         }
     }

     System.Collections.IEnumerator SwitchColor( Renderer renderer, Color newColor )
     {
         Color color = renderer.material.color;
         renderer.material.color = newColor ;
         yield return new WaitForSeconds( 2 );
         renderer.material.color = color;
     }


Or make OnCollisionEnter a coroutine (be carefull, this method does not apply to every MonoBehaviour functions)

     System.Collections.IEnumerator OnCollisionEnter2D( Collision2D coll )
     {
         if ( coll.gameObject.tag == "enemy" )
         {
             Renderer renderer = gameObject.GetComponent<Renderer>();
             SpriteRenderer[] spriteRenderers = GetComponentsInChildren<SpriteRenderer>();

             // Turn red
             foreach ( SpriteRenderer sr in spriteRenderers  )
             {
                 sr.material.color = Color.red;
             }
             renderer.material.color = Color.red;

             // Wait
             yield return new WaitForSeconds( 2 );

             // Turn black
             foreach ( SpriteRenderer sr in spriteRenderers  )
             {
                 sr.material.color = Color.black;
             }
             renderer.material.color = Color.black;
 
         }
     }
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avatar image ENDAS_ORIGINAL · Apr 26, 2018 at 07:47 PM 0
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I need to make it with Time.deltaTime or Time.time and I don't know how because nothing I try is working...

avatar image Hellium ENDAS_ORIGINAL · Apr 26, 2018 at 08:38 PM -1
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You mean you want a smooth transition between the colors?

avatar image ENDAS_ORIGINAL Hellium · Apr 28, 2018 at 01:34 PM 0
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I wanted to make that delay with Time.deltaTime because none of options you showed me worked but after my brother fixed something, the second way started working properly so thanks a lot :)

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