How to clone a material in each instantiated prefab as Unique temporary material.

Questions & Answers
1

Hello guys, i tried everything to instantiate a material into a clone of a prefab.
I tried to attach a script into a Car Prefab who can randomize colors, in each cloned prefab i need to put a new material or a temporary material with one color each.

I tried to change the material who references the prefab but all the cars change to the same color in each start of my coroutine.

private void RandomCarColor(){
rlColor = carColor[randomColorNumber];
	 string shaderText =
    "Shader \"Alpha Diffuse\" {" +
    "Properties { _Color (\"Main Color\", Color) = (1,1,1,0) }" +
    "SubShader {" +
    "    Tags { \"Queue\" = \"Transparent\" }" +
    "    Pass {" +
    "        Blend One One ZWrite Off ColorMask RGB" +
    "        Material { Diffuse [_Color] Ambient [_Color] }" +
    "        Lighting On" +
    "        SetTexture [_Dummy] { combine primary double, primary }" +
    "    }" +
    "}" +
    "}"; 
	 renderer.material = new Material( shaderText );
	         renderer.material.color = rlColor;
	 clonedMaterial.color = rlColor;

What help i need:
How to, assign a temporary material for each instance i spawn from this original car object.

I can saw the new material(Instantiated) in the inspector but it not assigned the color cars dont change for a unique color each one.
Someone can help? Thanks.

3

When you alter a property of a material during runtime, Unity automatically creates a clone of the material and uses it for the current prefab/clone only. The other objects in the scene using the same material won’t be affected, unless you use:

renderer.sharedMaterial
2

I think you may be over complicating this or I don’t fully understand.

If you are trying to just create a new color for each car, then do something like this:

var prefab : GameObject;
var colors : Color[];

function Start()
{
	for(var i=0; i<5; i++)
	{
		var instPrefab : GameObject = Instantiate(prefab, Vector3(5*i,5*i,0), Quaternion.identity);
		instPrefab.renderer.material.color = colors[Random.Range(0, colors.Length)];
	}
}

Tell me if this doesn’t help.

4

I did, something more easily, i opened the maya modeling, and change my car model, i combine all the polygons into one, imported to the unity again and created a new car prefab puting the Unique Mesh into the prefab, then i created a script who randomize the color at the Start() function. Thanks a lot bro for your time.

5

You maybe looking for procedural materials that can be created at runtime?

http://docs.unity3d.com/Manual/class-ProceduralMaterial.html