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Prefab creation with variant materials (in editor script)

Discussion in 'Prefabs' started by crawfis, Dec 31, 2020.

  1. crawfis

    crawfis

    Joined:
    Jan 30, 2014
    Posts:
    118
    I am trying to develop some Editor-based PCG tools. I call
    PrefabUtility.InstantiatePrefab
    to create a new instance as follows:
    Code (CSharp):
    1.             GameObject newGameObject = UnityEditor.PrefabUtility.InstantiatePrefab(prefab) as GameObject;
    2.  
    Once the new game object is created, I want to modify the color of the material. I have tried the three options below and they all have problems (Note, this is by clicking a button in the editor - NOT runtime or during Play). I have 3 possible work-arounds (below), but wanted to see if I am doing something wrong.

    Code (CSharp):
    1.         public async Task ApplyAsync(GameObject prefab)
    2.         {
    3.             Renderer renderer = prefab.GetComponent<Renderer>();
    4.             if(renderer != null)
    5.             {
    6.                 Color newColor = randomColor.GetNext();
    7.                 // Option 1: Editor give error - use sharedMaterial. Prefab materials are broken when dragged into folder.
    8.                 //renderer.material.color = newColor;
    9.                 // Option 2: All prefabs have the same color.
    10.                 //renderer.sharedMaterial.color = newColor;
    11.                 // Option 1: Prefab materials are broken when dragged into folder. New materials are lost.
    12.                 var newMaterial = new Material(renderer.sharedMaterial);
    13.                 newMaterial.SetColor("_Color", newColor);
    14.                 renderer.material = newMaterial;
    15.             }
    16.             await Task.CompletedTask;
    17.         }
    18.  
    Hopefully someone has an easy fix to this problem. I have searched quite a bit and cannot find a solution. Some possible work-arounds:
    1. Explicitly Save the materials (even duplicates) somehow. I am looking at 1000's of instances.
    2. Use a predefined Material palette and set the material to that.
    3. Add a script to the prefab that will change the color at runtime (will not be able to see the results in the editor at design time though).
     
  2. WidmerNoel

    WidmerNoel

    Joined:
    Jun 3, 2014
    Posts:
    66
    I am having this issue as well. The API seems way too ambiguous and complicated to figure out how this should be done.