public static GameObject activeGameObject ;

説明

アクティブなゲームオブジェクトを返します(インスペクターで示されているひとつ)

It will also return game objects that might be Prefabs or non-modifiable objects.

using UnityEngine;
using UnityEditor;

class Example : EditorWindow { // Rotates the selected Game Object +45 degrees if the user presses 'g' // or -45 degrees if the user presses 'Shift + g' // If no object is selected, the Menus are grayed out.

[MenuItem("Example/Rotate Green +45 _g")] static void RotateGreenPlus45() { GameObject obj = Selection.activeGameObject; obj.transform.Rotate(Vector3.up * 45); }

[MenuItem("Example/Rotate Green +45 _g", true)] static bool ValidatePlus45() { return Selection.activeGameObject != null; }

[MenuItem("Example/Rotate green -45 #g")] static void RotateGreenMinus45() { GameObject obj = Selection.activeGameObject; obj.transform.Rotate(Vector3.down * 45); }

[MenuItem("Example/Rotate green -45 #g", true)] static bool ValidateMinus45() { return Selection.activeGameObject != null; } }