Selection.activeTransform 激活变换

// C# Example
// Duplicates the selected object and places it at the origin
// 复制选择的物体并将它放置在原点

using UnityEngine;
using UnityEditor;

public class SelectionActiveTransform : ScriptableObject {
	[MenuItem ("Example/Duplicate at Origin _d")]
	static void DuplicateSelected() {
		Instantiate(Selection.activeTransform, Vector3.zero, Quaternion.identity);
	}

	//The menu item will be disabled if nothing, is selected.
	//菜单项目将会失去效用，如果没有事物被选择。
	[MenuItem ("Example/Duplicate at Origin _d", true)]
	static bool ValidateSelection () {
		return Selection.activeTransform != null;
	}
}