Different color for each instance of a prefabs

[TheTrueHelix]

So I’m currently trying to generate a world using a prefab with only a MeshRenderer on it. My goal is to generate a world and having each instances having a different color. I heard that you need to create a new material every time when u do so but it is not working right now, Any idea why ?

public class HexGeneration : MonoBehaviour {

public GameObject platformMesh;
public int height = 5;
public int lenght = 5;

// Use this for initialization
void Start () {
    for (int i = 0; i < height; i++)
    {
        for (int j = 0; j < lenght; j++)
        {
            GameObject generatedPlatform = Instantiate(platformMesh, new Vector3(0,0,0), Quaternion.identity) as GameObject;

            Transform platformTransform = generatedPlatform.GetComponent<Transform>();
            ChangePosition(platformTransform, i, j);

            MeshRenderer platformRenderer = generatedPlatform.GetComponent<MeshRenderer>();
            ChangeMaterial(platformRenderer);
            
        }
    }
}

// Update is called once per frame
void Update () {

}

void ChangeMaterial(MeshRenderer platformRenderer)
{
    Material material = new Material(Shader.Find("Standard"));
    Color color = new Color(Random.Range(0, 1), Random.Range(0, 1), Random.Range(0, 1), 1);

    material.color = color;

    platformRenderer.material = material;
}

void ChangePosition(Transform platformTransform, float height, float lenght)
{
    if (height % 2 == 0)
        platformTransform.Translate(lenght * 8.66f, 0, -height * 7.5f);
    else
    {
        if (height == 1) 
            platformTransform.Translate((lenght * 8.66f) + 4.33f, 0, -7.5f);
        else
            platformTransform.Translate((lenght * 8.66f) + 4.33f, 0, -height * 7.5f);

    }
}

}

[UsmanAbbasi]

You can change color like this:

 void ChangeMaterial(MeshRenderer platformRenderer)
 {
     Color color = new Color(Random.Range(0, 1), Random.Range(0, 1), Random.Range(0, 1), 1);
     platformRenderer.material.color = color;
 }

Accessing material property using “renderer.material” automatically creates new material for that object so you don’t have to create it. You should know the difference between “material” and “sharedMaterial” property.
This two links will help you understand this concept:

Unity - Scripting API: Renderer.material

Unity - Scripting API: Renderer.sharedMaterials

And by “it is not working”, do you mean that color is not changing or are you having any errors?

Tip: If color is not changing then try to assign color like this just to make sure that issue is with color assigning and not somewhere else:

 platformRenderer.material.color = Color.red;