Tracking the ammo and eliminated targets
To get our UI to respond to the player interacting with the environment, we will need to modify the Blueprint scripting that controls the player and targets. To begin, let's get the ammo counter to decrease when the player fires a shot from their gun.
Reducing the ammo counter
The Blueprints managing the firing of the player's gun are contained within the FirstPersonCharacter Blueprint. Find this Blueprint within the Blueprints folder of Content Browser and open it. Now find the large series of Blueprint nodes contained within the comment block Spawn projectile. We want to ensure that the counter tracking the player's current ammo count reduces by one, each time the player fires a shot. The Blueprint scripting required to do so looks like this:
Find the final node in the chain, Play Sound at Location. Drag a wire from the output execution pin of this node to empty grid space, and add a Set Player Current Ammo node. Then drag a wire from...
