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How To Make A Game - Adding Interesting Enemies [6]
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Game developers looking to enhance their projects by adding varied and engaging enemy AI behaviors.
TL;DR
This video tutorial demonstrates how to add unique enemy behaviors to a wave defense game. It covers implementing distinct movement patterns for ghosts and imps using AI extensions, and a unique drop-and-scale mechanic for spiders, concluding with game over conditions.
Key Takeaways
- The Boyd's extension offers a quick method to implement more interesting and dynamic enemy movement patterns beyond simple pathfinding.
- Adjusting parameters like decision weight and max speed is crucial for fine-tuning enemy AI behavior to achieve desired effects.
- Giving enemies unique abilities, such as projectile attacks or evasive maneuvers, significantly enhances gameplay challenge and player engagement.
- Implementing player-bullet collision for enemy projectiles provides a defensive mechanic, allowing players to actively counter threats.
- Using a combination of behaviors like tweening and spawning at specific points can create unique enemy appearances and entry animations.
- The spider's 'drop' behavior, using tweening for scale and position, creates an engaging visual effect of enemies descending.
- Adding game over conditions for both enemy proximity to the center and enemy bullets reaching the target increases the stakes.
- Enemy AI that reacts to the player, like ghosts avoiding them, can lead to emergent gameplay scenarios and strategic depth.
In This Video
- 00:00Introduction to Enemy AI
This video concludes the series by adding unique enemy movement and abilities, including mobile controls.
- 00:30Boyd's Extension for Ghosts
Using Boyd's extension for unique ghost movement towards the center, with initial speed and rotation adjustments.
- 02:58Ghost Avoids Player
Ghosts now avoid the player, creating a dynamic and more interesting enemy behavior.
- 03:22Imp Movement and Firing
Imps move slower, don't fear the player, and fire bullets towards the center with a cooldown.
- 06:36Bullet Collision with Player
Player can now block enemy bullets with their body, adding a defensive mechanic.
- 07:37Spider Drop and Scale
Spiders drop from the ceiling and scale into view using tweening behaviors.
- 14:56Game Over Conditions
Game over if an enemy or its bullet reaches the center, restarting the game.
Questions & Answers
How to make enemies move in a game?
Use the Boyd's extension for unique movement patterns. Adjust speed, rotation, and decision weights to control their behavior, like moving towards or avoiding the center.
How to make enemies shoot projectiles?
Use the 'fire bullet' extension. Set a firing cooldown and specify the bullet's origin and target position, adjusting speed and alignment as needed.
How to make bullets blockable by the player?
Create a new event where if an enemy bullet collides with the player, the enemy bullet is deleted. Adjust the player's collision mask if necessary.
How to make enemies drop from the ceiling?
Use points for spawning, add a 'tween' behavior for scaling and Y-position. Spawn objects above the desired position and tween them down to create a dropping effect.
How to make enemies unique in a game?
Give each enemy a unique movement pattern or ability. For example, ghosts avoid the player, imps shoot fireballs, and spiders drop from the ceiling.
How to trigger game over in the game?
Implement game over conditions using 'OR' logic. Game over occurs if an enemy reaches the center or if an enemy bullet reaches the center.
Key Terms
- Boyd's extension — A tool used to give basic enemies more interesting and unique movement patterns.
- Fire bullet extension — An extension that allows enemies to fire projectiles towards a specific position.
- Tween Behavior — A behavior that allows objects to smoothly transition between states, like scaling or moving over time.