New Features and Enhancements

1. Achievement System:
   • Kill Count Achievements: Players can now earn achievements based on the number of zombies they kill (e.g., "Zombie Hunter", "Zombie Slayer", "Zombie Master").
   • Level Milestone Achievements: Players receive achievements for reaching specific levels (e.g., "Rising Star", "Veteran", "Legend").
   • Special Kill Achievements: Bonuses based on killing specific types of zombies (like blue, brute, or speeder).
2. Combo System:
   • Players can now build a combo by achieving kills within a certain time frame.
   • Last kill time and combo multiplier logic were introduced, allowing for increased rewards for maintaining combos.
3. Power-Up System:
   • New power-ups such as Double Score, Rapid Fire, and Invincibility were added. Each has a defined duration and may be activated during gameplay.
4. Weather System:
   • A dynamic weather system was introduced, which includes effects like rain, fog, and storms. The weather changes every minute, altering the game's ambiance and visuals.
   • Each weather type impacts the scene in specific ways, such as changing fog levels and creating lightning effects during storms.
5. Day/Night Cycle:
   • A basic day/night cycle was added, allowing for changes in light intensity every five minutes. This can further impact the game's atmosphere.
6. Particle Effects Improvements:
   • More detailed particle effects were implemented for death and destruction, creating a more visually engaging experience.
7. Enhanced Graphics and Geometry:
   • Improved geometries and materials for players, zombies, and environment elements.
   • Player and zombie mesh optimizations, as well as the introduction of reusable geometries and materials.
8. Gameplay Mechanics:
   • Zombies now exhibit dynamic movement patterns based on player behavior, making them more challenging and engaging.
   • Added health kit and coin collection improvements, ensuring better interactions.
9. Visual and UI Feedback:
   • Added notifications for achievement unlocks and new abilities, enhancing player engagement when they reach milestones or unlock features.
10. Integration of Functions:

• Functions for handling various updates, such as weather changes and combos, were added to streamline gameplay logic and improve code organization.
  
  BUG FIX'S
  
  
• Achievement Tracking:
  
• Bug: Achievements might not register correctly when a player fulfills a requirement.
• Fix: Implementing and checking the achievements system to ensure it properly updates when players achieve set milestones, such as kills or level-ups.
• Combo System Logic:
• Bug: Combos might not reset correctly after a timeout, leading to unintended multipliers.
• Fix: Ensuring that the logic correctly resets the combo if the time since the last kill exceeds the comboTimeout, preventing unintended streaks.
• Projectile Handling:
• Bug: Bullets or projectiles could be incorrectly colliding with entities or objects in the scene, causing inconsistent damage.
• Fix: Verifying collision detection logic for bullets with both zombies and trees to ensure proper interaction and removal from the scene.
• Zombie AI Movement:
• Bug: Zombies might not be reacting correctly to player actions or might get stuck in certain environments.
• Fix: Adjusting the movement logic to improve how zombies navigate the environment and react to player movement, especially considering player cover utilization.
• Health and Damage Calculation:
• Bug: Players might be taking more damage than expected, or health kits might not be providing the expected healing.
• Fix: Ensuring that the damage calculation considers abilities and that health restoration from kits reflects the expected values.
• Weather Effects:
• Bug: Weather changes might not apply correctly, or effects (like fog) might not render properly in the scene.
• Fix: Ensuring that weather transitions work as intended, affecting visual rendering (e.g., fog density changes).
• Shop Interaction:
• Bug: Items in the shop might not display correctly or be purchased multiple times without debiting coins properly.
• Fix: Improving shop logic to ensure items can only be bought once, and proper feedback is given when purchasing.
• General UI Bugs:
• Bug: UI elements (health bars, XP fill) might not update in real-time or reflect the true state of the player's stats.
• Fix: Making sure that all UI elements are correctly updated during gameplay, ensuring consistent and accurate information for the player.
• Game Pausing and Resuming:
• Bug: Pausing the game might not stop all game logic (e.g., zombies still moving or bullets still flying).
• Fix: Fine-tuning the pause logic to ensure that all game activities halt correctly when the game is paused.
• Lightning Effect:
• Bug: Lightning effects may not trigger correctly or might flash too often.
• Fix: Ensuring that the intervals and probabilities for the lightning effect are correctly set to avoid getting triggered too many times in succession.