Unity3d 如何找到游戏对象并改变其颜色

//游戏对象
private var obj:GameObject;
//渲染器
private var render:Renderer;
//贴图
private var texture:Texture;

function Start ()
{
//获取游戏对象
obj = GameObject.Find("Cube");
//获取该游戏对象的渲染器
render = obj.GetComponent("Renderer");
}

function OnGUI()
{
if (GUILayout.Button("Color",GUILayout.Width(100),GUILayout.Height(50)))
{
//改变渲染的颜色
render.material.color = Color.green;
//添加组件贴图
render.material.mainTexture = null;
}

if(GUILayout.Button("add",GUILayout.Width(100),GUILayout.Height(50)))
{

render.material = null;
render.material.mainTexture = texture;
}
}

Shader "Custom/NewShader" {
Properties {
_Color ("Main Color", COLOR) = (1,1,1,1)
_AmbientColor("Ambient Color",COLOR) =(0,1,0,1)
}
SubShader {
Pass {
Material {
Diffuse [_Color]
Ambient [_AmbientColor]
}
Lighting On
}
}
}

CubeObj.renderer.material.shader = Shader.Find("Custom/NewShader");     //设置材质的shader
print(CubeObj.renderer.material.GetColor("_AmbientColor"));  //获取_AmbientColor 的颜色
CubeObj.renderer.material.SetColor("_AmbientColor", Color.red);  //设置_AmbientColor的颜色

//Renderer[] renders = obj.GetComponentsInChildren<Renderer>();

//foreach (Renderer one in renders)
//{
//    one.material.shader = Shader.Find("Custom/NewShader");
//    Color changeColor = new Color(1,0.33f,1,1);
//    one.material.SetColor("_IlluminCol", changeColor);  //设置颜色
//}