Table of Contents
Implementing Vision Cones for AI in Godot
Understanding AI Vision Systems
One of the core elements in stealth games is an AI’s ability to ‘see’ the player using a vision cone. This field of view allows AI to detect a player when they enter a cone-shaped area in front of the character.
Steps to Implement a Vision Cone in Godot
- Setting Up the AI Character: Ensure your AI character is controlled by a script. Attach a script to your AI node for handling vision.
- Using a 2D RayCast or Area2D Node: Godot provides various nodes for detection. You can use an
Area2Dnode with aCollisionShape2Dfor the cone, or dynamically cast rays usingRayCast2Dnodes spread out to form a cone. - Configuring the Vision Cone: If using an
Area2D, you can configure aCollisionPolygon2Dto represent the vision cone. Adjust the polygon points to form a triangular shape representing the cone. - Detection Logic: Use the
signal area_enteredif using anArea2Dto detect when the player node enters the vision cone. If using raycasts, iteratively check if the rays intersect with the player’s collision shape.
extends KinematicBody2D
var vision_cone = null
func _ready():
vision_cone = $VisionConesignal area_enteredlogic for detecting player entry.- Update Cone Direction: In the
_processfunction, update the vision cone’s position and rotation based on the AI’s direction to emulate realistic vision.
Fine-Tuning and Optimization
- Use layers and masks to restrict detection to player-related objects, enhancing performance.
- Dynamically adjust the vision cone size and length based on gameplay factors, such as the AI being alerted.
Additional Considerations
Ensure the vision system is well-optimized, and test thoroughly to avoid false positives or missed detections.
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