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Question by noahl731 · Apr 06, 2019 at 02:28 PM · c#raycastraycasthit

Use raycast to change color

I have a cube that I want to change the color of when the raycast hits it, and when the raycast stops hitting the cube changes back to its original color. Here's what I have now

 bool mouseOver;
 Ray ray;
 RaycastHit hit;
 GameObject currentHit;
 
 void Update()
     {
         ray = Camera.main.ScreenPointToRay(Input.mousePosition);
 
         Color startColor = Color.white;
 
         if(Physics.Raycast(ray,out hit))
         {
             currentHit = hit.collider.gameObject;
             if (currentHit.GetComponent<Collider>().tag.Equals("Item"))
             {
                 mouseOver = true;
                 currentHit.GetComponent<Renderer>().material.color = Color.yellow;
             } else {
                 mouseOver = false;
             }
         }
 
         if(!mouseOver) {
             if(currentHit.tag.Equals("Item")) { 
                 currentHit.GetComponent<Renderer>().material.color = startColor;
                 currentHit = null;
             }
         }
     }


This works when the raycast hits the cube but when the raycast stops hitting the cube, the color doesnt change. What am I doing wrong?

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Answer by Hellium · Apr 06, 2019 at 05:09 PM

Following code not tested because I'm on my mobile phone.

  public Color HighlightColor = Color.yellow ;
  private Collider hitObject;
  private Color initialColor;
  private Material hitObjectMaterial;
  private Camera camera;

  private void Start()
  {
      camera = Camera.main;
  }

  private void Update()
  {
      Ray ray = camera.ScreenPointToRay(Input.mousePosition);
      RaycastHit hit;

      if( Physics.Raycast(ray,out hit) && hit.collider.CompareTag("Item") )
      {
          if( hitObject != null )
              hitObjectMaterial.color = initialColor;
          hitObject = hit.collider;
          hitObjectMaterial = hitObject.GetComponent<Renderer>().material;
           hitObjectMaterial.color = HighlightColor;
      }
      else if ( hitObject != null )
      {
          hitObjectMaterial.color = initialColor;
          hitObject = null;
          hitObjectMaterial = null;
      }
  }


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