Help with script , Change tag depending on material attached

Question

Hi all , i have this problem that is making me itch my head. I have a grid of tiles , and instead of changing their tags manually, i want it to be possible for me to add a script and have the the tiles change their own tag based on what material colour i attach to them.

The Materials im using look like this , Each having a default "UI" shader (The reason i used the Default UI shader is because its the only one that brings out the colour without needing a light source. If this is wrong or a better way , please correct me)

alt text

Now , here is my hierarchy alt text

Lastly , this is my Code , Which is attached to "TileGrid"

     public Material Red;
     public Material Yellow;
     public Material Blue;
 
     void Start()
     {
         Transform TileGrid = transform;                             
         int GridChildCount = TileGrid.childCount;                   
 
         for (int i = 0; i < GridChildCount; ++i)                    
         {
             Transform GridRow = TileGrid.GetChild(i);              
             int setChildCount = GridRow.childCount;                 
 
             for (int j = 0; j < setChildCount; ++j)                   
             {
                 SetTagAccordingToMaterial(GridRow.GetChild(j));    
             }
         }
     }
 
     private void SetTagAccordingToMaterial(Transform Tile)
     {
         Renderer TileRenderer = Tile.GetComponent<Renderer>();
 
         if (TileRenderer.material == Red)
         {
             tag = "Red";
         }
         else if (TileRenderer.material == Yellow)
         {
             tag = "Yellow";
         }
 
         else if (TileRenderer.material == Blue)
         {
             tag = "Blue";
         }
     }
 }

So to give an idea of what the code above is meant to do, remembering that this script is attached to "TileGrid" , is when I click run first get the material of the Children's Children (so basically the "Tile"). Than to change the Tag of "Tile" depending on the attached material.

Also , I drag all 3 materials/colours into the "public Material Red/Yellow/Blue" in Unity.

So what's happening ?

Basically Nothing , Whenever i run , the Tags do not change.

I'm wondering if maybe the material i am using isn't recognized by the GetCompontent ?

Any Help would be gladly appreciate it , Im also not 100% sure if my Loops to get the rendered in the first place work properly as i haven't been able to test it since nothing is working.

Answer 1

There are two problems with your SetTagAccordingToMaterial method:

The condition :
```
  TileRenderer.material == Red
```

does not work. It works when you compare names.

 TileRenderer.material.name == Red.name + " (Instance)"

In the statement
```
  tag = "Red"
```

tag refers to your TileGrid's tag, but what you want is each Tile's tag. So change it to:

 Tile.tag = "Red"

And the same for the other two colors. Of course, don't forget to add those three tags to Project Settings->Tags and Layers

     private void SetTagAccordingToMaterial(Transform Tile)
     {
         Renderer TileRenderer = Tile.GetComponent<Renderer>();
     
         if (TileRenderer.material.name == Red.name + " (Instance)")
         {
             Tile.tag = "Red";
         }
         else if (TileRenderer.material.name == Yellow.name + " (Instance)")
         {
             Tile.tag = "Yellow";
         }
         else if (TileRenderer.material.name == Blue.name + " (Instance)")
         {
             Tile.tag = "Blue";
         }
     }

Help with script , Change tag depending on material attached

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