Unity Damage System | Unity Lock Cursor | Mouse Pointer - Unity 3d Game Development Tutorials 2022

Introduction

In this tutorial, we will create a damage system and implement mouse pointer locking in Unity for a third-person perspective game. This guide is part of a larger course designed to help you build your own 3D game using the Unity game engine. By following these steps, you'll enhance your game mechanics and improve player interaction.

Step 1: Setting Up the Damage System

To implement a damage system, follow these steps:

1. Create a Health Script

   • Create a new C# script named Health.
   • Define a public variable for health points.
   • Include methods to take damage and check if the player is alive.

   public class Health : MonoBehaviour
   {
       public int healthPoints = 100;
   
       public void TakeDamage(int damage)
       {
           healthPoints -= damage;
           if (healthPoints <= 0)
           {
               Die();
           }
       }
   
       void Die()
       {
           // Handle death (e.g., play animation, destroy object)
       }
   }
   

2. Integrate Damage into Game Objects

   • Attach the Health script to any game object that should take damage.
   • Ensure that other game objects can call the TakeDamage method when they hit this object.

3. Test the Damage System

   • Create a simple projectile or enemy that can deal damage.
   • Ensure that when the projectile collides with the player object, it calls the TakeDamage method.

Step 2: Locking the Mouse Cursor

To improve player experience, we can lock the mouse cursor to the center of the screen when the game starts.

1. Modify the Game Manager Script

   • Locate or create a GameManager script to handle game states.

   public class GameManager : MonoBehaviour
   {
       void Start()
       {
           LockCursor();
       }
   
       void LockCursor()
       {
           Cursor.lockState = CursorLockMode.Locked;
           Cursor.visible = false;
       }
   }
   

2. Add Game Manager to Scene

   • Attach the GameManager script to an empty GameObject in your scene to ensure it runs on game start.

3. Test Cursor Locking

   • Play the game and ensure that the cursor is locked in the center of the screen and not visible.

Step 3: Adjusting Mouse Pointer for Player Interactions

To make your game more interactive, you may want to unlock the cursor when the player presses a specific key.

1. Update the Game Manager Script

   • Add an input check to unlock the cursor when the player presses the Escape key.

   void Update()
   {
       if (Input.GetKeyDown(KeyCode.Escape))
       {
           UnlockCursor();
       }
   }
   
   void UnlockCursor()
   {
       Cursor.lockState = CursorLockMode.None;
       Cursor.visible = true;
   }
   

2. Test Unlocking the Cursor

   • Play the game and press the Escape key to ensure that the cursor unlocks and becomes visible.

Conclusion

In this tutorial, we successfully set up a basic damage system and implemented mouse cursor locking for a smoother gameplay experience. You can further expand upon these systems by adding health regeneration, different damage types, and enhanced player controls. As you progress in your game development journey, remember to regularly test and refine your game mechanics for the best player experience. Happy developing!