Selection.activeGameObject

Description

Returns the active game object. (The one shown in the inspector).

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

// 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 function RotateGreenPlus45() {
    var obj = Selection.activeGameObject;
    obj.transform.Rotate(Vector3.up*45);
}

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


@MenuItem ("Example/Rotate green -45 #g")
static function RotateGreenMinus45() {
    var obj = Selection.activeGameObject;
    obj.transform.Rotate(Vector3.down*45);
}

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