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Question by berzerkey · Nov 12, 2018 at 09:32 PM · uimaterialmaterialsarrayschildren

How to change specific material shared among specific children.

Hi there, I am encountering some trouble in my code and was hoping someone would be kind enough to assist me in wrapping my head around this.

The scene:

1 game-object with 5 child-objects, with differing materials.

alt text

  • 1 child with paint.

  • 2 children with plastic.

  • 2 children with metal.

    The goal:
    To attach a script to the parent object, "The Thing" and to be able to edit ONLY the children who share the black-plastic material.

    I've set up a few buttons, when clicked, it will run the script that's attached to the parent object:

         using System.Collections;
         using System.Collections.Generic;
         using UnityEngine;
     
         public class PaintChange3 : MonoBehaviour {
         
         Renderer[] children;
         public Material[] plastics;
     
     
         // Use this for initialization
         void Start () 
         {
     
             //children is a reference to the renderers
             children = GetComponentsInChildren<Renderer>();
     
             foreach (Renderer rend in children)
             {
                 //make array of all materials in renderer
                 Material[] materials = rend.materials;
             }
         }
     
         //Changes Plastic
         public void ChangePlastic(Material matPlastics)
         {
     
             foreach (Renderer rend in children)
             {
                     var mats = new Material[rend.materials.Length];
                     for (var j = 0; j < rend.materials.Length; j++)
                     {
                         mats[j] = matPlastics;
                     }
                     rend.materials = mats;
             }
     
             Debug.Log("Changed Plastics, Maybe?");
     
         }
     }
     
    
     
    



The problem with my script is that it affects every child's renderer, I do not know how to target just the plastic children. How should I approach this solution?
alt text



Thank you again!

2018-11-12-16-06-24-clipboard.png (210.0 kB)
2018-11-12-16-04-27-clipboard2.png (257.2 kB)
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Answer by II_Spoon_II · Nov 13, 2018 at 08:42 PM

  public void ChangePlastic(Material matPlastics)
  {
 
      foreach (Renderer rend in children)
      {
              var mats = new Material[rend.materials.Length];
              for (var j = 0; j < rend.materials.Length; j++)
              {
                  //add a condition to check if the current material is blackPlastic
                  if (mats[j]==blackPlasticMaterial)
                  {
                  mats[j] = matPlastics;
                  }
              }
              rend.materials = mats;
      }
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