Two types of actors (pawn) have been created:

• An actor called tank constituted of 5 meshes (tank body, track*2, turret and barrel).
• An actor called turret constituted of 3 meshes (mortar body, turret and barrel).

Note that I didn't created these meshes.

In total, 9 classes have been created, the name of the classes as well as their dependencies are shown in the pictures below. All these classes are used by the actor "tank" and all the classes boxed in blue are also used by the actor "turret". The code source of these C++ classes is available here. Note that Unreal implements a garbage collection system whereby it will automatically delete objects when they are no longer needed. Therefore the following classes (derived from UObjects) does not have a destructor.

Aiming component: The purpose of Aiming Component is to:

• Compute a launch velocity for a projectile to hit a specified point.
• Move barrel and turret toward the direction where player is aiming.
• Monitores the tank firing state. There is 4 different states: "isOutOfAmmo", "isReloading", "isBarrelMoving", "isReady". These states are used to determine the color of player's aiming reticule and are also used to determine when AI and player are allowed to fire.
• Fire a projectile, i.e. spawn and launch an object.

Projectile: The purpose of Projectile class is to:

• Add particle effects on projectile.
• Enable/disable particle effects, emit a radial force and apply damages when projectile hit physics objects.
• Destroy projectile after it hits a physic object.
• Apply damages when it hits actors

Barrel: The purpose of Barrel class is to provide a procedure allowing to rotate barrel (pitch axis).

Turret: The purpose of Turret class is to provide a procedure allowing to rotate turret (yaw axis).

Player Controller: The purpose of Player Controller class is to:

• Convert current player's aiming reticule position to World Space 3D direction.
• Trace a ray from player's aiming reticule against the world using a specific channel and return the first blocking hit (current target).
• Execute every frames the procedure from the Aiming Component allowing to move barrel and turret toward the current target.

AI Controller: The purpose of AI Controller class is to:

• Makes tanks controlled by AI go toward player.
• Execute every frames the procedure from the Aiming Component allowing to move barrel and turret toward player's location.
• Fire a projectile toward player's location.

Tank: The purpose of Tank class is to:

• Reduce tank health when tank is hit by a projectile.
• Monitor the tank health state. There is 4 different states: "dead", "low", "half", "high". These states are used to determine tank's health bar color.
• Send a notification to the "Player Controller" class when player's tank has no more health.

Input: "Input" is not a C++ class, therefore it has been highlighted in green and the related dependency is shown with a dotted arrow.

Movement Component: The purpose of Movement Component class is to allow AI and player to move their respective tank through a Fly-by-wire system.

Track: The purpose of Track Class is to provide a procedure allowing to apply a force on tank's tracks.

3 elements to assist the player have been added:

• An aiming reticule.
• A health bar for each tank.
• A display (right top corner) of player's ammo number.

A main menu composed of a main background and 2 buttons has been created and implemented through a dedicated level. The blueprint used to implement it in a level as well as the blueprint used to configure the buttons are displayed below.

Camera and Tank Control

Camera Control

A camera rotation system has been implemented by using a spring arm and a azimuth gimbal (a pivoted support that allows the rotation of the camera about a single axis) in order to allow the horizon to stay horizontal even when the tank is tilted. The blueprint used to rotate the spring arm and the gimbal according to player mouse move is displayed below.