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Question by hollym16 · Dec 17, 2014 at 03:37 PM · gameobjectraycastcolorstring

Click GameObject to change Color

I want to code so that when I click on a GameObject, it changes colour with each click. For example, it starts off white: click to turn red, click again and it turns green, and so on and so forth until it get back to white.

I've got a single click working with Raycast. I'm guessing I'd need to do a string perhaps?

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Answer by Kartik1607 · Dec 18, 2014 at 12:41 PM

Hey there, You don't need a loop to loop through color's. Use a variable to store current index of color and one to store the length of color array.

     Color[] colors = new Color[] {Color.white, Color.red, Color.green, Color.blue};
     private int currentColor,length;
     // Use this for initialization
 
     void Start () 
     {
         currentColor = 0; //White
         length = colors.Length;
         renderer.material.color = colors [currentColor];
     }

In update, when ray hit's increment the currentColor by 1. To make sure, it does not get above the max length, use the remainder operator.

 void Update () {
         
         if(Input.GetMouseButtonDown(0))
         {
             Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
             RaycastHit hit;
             if (Physics.Raycast(ray, out hit, 100))
             {
                 currentColor = (currentColor+1)%length;
                 renderer.material.color = colors[currentColor];
             }
         }
     }


Change the script as per your code.

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Answer by Cherno · Dec 17, 2014 at 04:27 PM

You need to declare an array of colors to cycle through, first:

 Color[] colors = new Color[] {Color.white, Color.red, Color.green, Color.blue};
 

Then, after the objects is hit by your RC, you call the following code:

 Color goColor = yourObject.renderer.material.color;
 for(int i = 0; i < colors.Length; i++) {
      
      if(goColor == colors[i] && i == colors.Length - 1) {
           yourObject.renderer.material.color = colors[0];
           Return;
      }
      else {
           yourObject.renderer.material.color = colors[i + 1];
           Return;
      }
 }

There are probably better ways to do it but that should get you started.

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avatar image hollym16 · Dec 18, 2014 at 11:46 AM 0
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I've created the following script:

 using UnityEngine;
 using System.Collections;
 
 public class colourchange : $$anonymous$$onoBehaviour {
 
     private GameObject Cube;
     Color[] colors = new Color[] {Color.white, Color.red, Color.green, Color.blue};
 
     // Use this for initialization
     void Start () {
 
         Cube = GameObject.Find("Cube");
     }
     
     // Update is called once per frame
     void Update () {
 
         if(Input.Get$$anonymous$$ouseButtonDown(0)){
             Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
             RaycastHit hit;
             if (Physics.Raycast(ray, out hit, 100)){
                 if(hit.transform.name=="Cube"){
                     Color goColor = Cube.renderer.material.color;
                     for(int i = 0; i < colors.Length; i++){
                         if(goColor == colors[i] && i == colors.Length - 1){
                             Cube.renderer.material.color = colors[0];
                             Return;
                         }
                         else{
                             Cube.renderer.material.color = colors[i+1];
                             Return;
     }
 }
                 }
             }
         }
     }
 }

However, I get the following error, regarding the 'Return' functions:

 Only assignment, call, increment, decrement, and new object expressions can be used as a statement

If i remove these two 'Returns', the script doesn't work; I click on the object and nothing happens. Any suggestions on what I may be doing wrong?

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