How to change all material elements of object's children

Question

So my problem is that my game object changes half of its materials and the other half is not affected. I want to change all of it and I need to do it by accessing the object's children. Any help would be appreciated.

Here is what I did so far..

 var newMat : Material;
 
 function Start() {
 ChangeMaterial();
 }
 
 function ChangeMaterial() {
     var children : Renderer[];
     children = GetComponentsInChildren.<Renderer>();
         for (var i : Renderer in children) {
         i.material = newMat;
         }
 }

Answer 1

Best Answer

Answer by robertbu · Mar 01, 2014 at 08:42 PM

Rereading your question, I'll bet your meshes have more than one material assigned. You will need to cycle through and reset all the materials on the mesh. Try this (untested):

     function ChangeMaterial(newMat : Material) {
     var children : Renderer[];
     children = GetComponentsInChildren.<Renderer>();
     for (var rend : Renderer in children) {
         var mats = new Material[rend.materials.Length];
         for (var j = 0; j < rend.materials.Length; j++) {
             mats[j] = newMat; 
         }
         rend.materials = mats;
     }    
 }

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TomatoOrgyLT · Mar 01, 2014 at 09:28 PM 1

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Yes my mesh has more than one material assigned. I think I did reset the materials on the mesh and modified the script according to your example but it doesn't seem to change anything.

robertbu · Mar 01, 2014 at 09:34 PM 0

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I edited my answer. Apparently you cannot replace individually replace materials in the 'materials' array. You have to create a new array and replace the whole thing. Try the edited code.

TomatoOrgyLT · Mar 01, 2014 at 09:58 PM 0

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Yay! It works great! Thanks for the help.

gsmetzer · Aug 22, 2017 at 10:09 PM 0

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Sorry to bring this old answer up but how would you write this in C#? I'm migrating all my code and having trouble with the syntax. Thank You.

Answer 2

Answer by Fritsl · Nov 01, 2017 at 02:50 PM

c# for the lazy :

     void ChangeMaterial(Material newMat)
     {
         Renderer[] children;
         children = GetComponentsInChildren<Renderer>();
         foreach (Renderer rend in children)
         {
             var mats = new Material[rend.materials.Length];
             for (var j = 0; j < rend.materials.Length; j++)
             {
                 mats[j] = newMat;
             }
             rend.materials = mats;
         }
     }

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DraCieLisAWAL · May 30, 2020 at 09:34 PM 0

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Any idea how do I set em back to original ?

Answer 3

Answer by metixgosu · Mar 16, 2021 at 07:53 PM

This code works but dont forget to add your parent game object name like.

      void ChangeMaterial(Material newMat)
      {
          Renderer[] children;
          GameObject parent;
          children = parent.GetComponentsInChildren<Renderer>();
          foreach (Renderer rend in children)
          {
              var mats = new Material[rend.materials.Length];
              for (var j = 0; j < rend.materials.Length; j++)
              {
                  mats[j] = newMat;
              }
              rend.materials = mats;
          }
      }

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mitchellvandun · Jan 05 at 12:50 PM 0

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hi metixgosu,

could u maybe help me with my thread?

https://forum.unity.com/threads/unity-xr-radial-menu-button-material-manager.1220454/

How to change all material elements of object's children

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