Complete 3D Shooting Mechanics - Godot 4 FPS Tutorial

Introduction

This tutorial guides you through creating complete shooting mechanics for a first-person shooter (FPS) game using Godot 4. You'll learn how to implement gun animations, projectile bullets, complex bullet collisions, dying animations, and enemy despawning. This knowledge is applicable to various game genres, including FPS, horror, survival, and RPGs.

Step 1: Setting Up Your Project

• Open Godot 4 and create a new project.
• Import the necessary assets:
  • Zombie Model: Download from Mixamo.
  • Ground Texture: Get it from Freepik.
  • Graveyard Kit: Download from Kenney.
  • Steampunk Rifle: Available at Poly Pizza.

Step 2: Creating the Weapon

• Create a new scene for your weapon.
• Add a MeshInstance3D node and assign the rifle model.
• Set up the animation tree:
  • Add an AnimationTree node to handle gun animations.
  • Create animations for idle, shooting, and reloading.

Step 3: Implementing Shooting Mechanics

• Create a script for the weapon:

  • Use the following code to handle shooting:

    func shoot():
        var bullet = Bullet.new()
        bullet.position = global_transform.origin
        bullet.rotation_degrees = get_global_mouse_position()
        get_parent().add_child(bullet)
    

• Connect the shooting function to an input event:

  • In the _input(event) function, check for the shooting key (e.g., left mouse button).

Step 4: Creating Bullet Mechanics

• Create a new scene for the bullet.
• Set up a RigidBody3D node for physics interactions.
• Add a script to handle bullet movement and collision:

  func _physics_process(delta):
      translate(Vector3.FORWARD * speed * delta)
  
  func _on_Bullet_body_entered(body):
      if body.is_in_group("enemies"):
          body.take_damage(damage)
          queue_free()
  

Step 5: Implementing Complex Bullet Collisions

• Use collision layers to differentiate between bullet hits on different body parts.

• Create an enum to define weak points:

  enum WeakPoints { HEAD, BODY }
  

• Update the bullet collision code to check for weak points and apply damage accordingly.

Step 6: Dying Animations and Enemy Despawning

• Add a dying animation to the enemy model:

  • Create an AnimationPlayer node and add a dying animation.

• In the enemy script, check for health:

  func take_damage(amount):
      health -= amount
      if health <= 0:
          play_dying_animation()
          queue_free()  # Despawn the enemy
  

Conclusion

You have successfully implemented essential shooting mechanics for your FPS game in Godot 4. Key steps included setting up the project, creating weapon and bullet mechanics, handling complex collisions, and implementing enemy animations. As next steps, consider refining your game by adding sound effects, UI elements for health and ammo, and additional enemy types for variety. Happy game developing!