How can I implement a feature to zoom in using the mouse wheel in Godot?

Implementing Mouse Wheel Zoom in Godot

Setting Up the Scene

To implement mouse wheel zoom functionality in a Godot 3D scene, you must first ensure your project is set up correctly. This involves having a Camera node that allows manipulation through user input and a 3D scene that requires zoom capabilities.

Code Implementation

extends Camera

var zoom_speed = 0.1
var min_distance = 1.0
var max_distance = 20.0

func _process(delta):
    if Input.is_action_just_pressed('ui_zoom_in'):
        zoom_in()
    elif Input.is_action_just_pressed('ui_zoom_out'):
        zoom_out()

func zoom_in():
    if translation.z - zoom_speed > min_distance:
        translation.z -= zoom_speed

func zoom_out():
    if translation.z + zoom_speed < max_distance:
        translation.z += zoom_speed

This script allows you to zoom in and out by manipulating the camera’s translation.z value, effectively moving it closer or further from the target.

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Integrating Mouse Events

Bind mouse wheel actions within Godot’s Input System. Open Project Settings, navigate to Input Map, and add actions named ui_zoom_in and ui_zoom_out. Assign them the mouse wheel up and down actions, respectively.

Fine-Tuning and Testing

• Adjust Speeds: Tweak zoom_speed, min_distance, and max_distance to suit your gameplay requirements.
• Test Regularly: Use Godot’s play mode to iterate and test the zoom performance dynamically.