Forge a Destructible and Interactive Virtual World - Unity 4 Game Development - page 499

Prepare for lift off
We will begin with creating a new tag for our destructible wall:
1. Let's go to Edit | Project Settings | Tags to bring out the Inspector view for Tags .
In the Inspector view, we will click on the triangle in front of the Tags element
and then on the Element 4 type Destructible , as you can see in the following
screenshot:
2. Next, we will go to GameObject | Create Empty to create an empty game object
and name it Wall to reset its transform position to X : 0 , Y : 0 , and Z : 0 . Then we
are ready to start.