Creating cover AI

Our AI enemy will just keep attacking the player as long as it is close enough to the ship. However, this isn't very realistic; we'd like the enemy ship to attack for a little bit but then duck and head for cover. We could have this hiding behavior be based on a response to the player fighting back, but for this demo, we will make it a constant value of 5 seconds; after attacking the player for 5 seconds, it will hide.

To set this up, first we'll add an isHidingbool variable to our behavior tree that is set to true after 5 seconds of attacking. Create a new constraint node under the root parallel node with the playerAttack != null && isHiding == false expression. This node's children start when playerAttack is valid and we are not already hiding from the player. Add a sequencer node under this constraint so it will go through all of its children. The first child needs to be a new timer node with the Seconds value of 5 and Returns set to Success. Next, copy the don...