The _process method

Learn to run code every frame with _process.

_process(delta) and Game Loop

_process(delta) is the function called on every frame in Godot's main game loop. Continuous movement, keyboard and mouse inputs, or constantly changing counters are updated inside this function.

extends Node2D

func _process(delta: float):
    position.x += 100.0 * delta

Frame-Rate Independent Movement

Games can run at different frame rates such as 30, 60, or 144 FPS across different hardware. Multiplying movement by delta normalizes the distance traveled per second, ensuring the game runs at the same speed on every computer.

extends Node2D

var hiz: float = 250.0

func _process(delta: float):
    position.y += hiz * delta

Exercise Define _process and _ready

Define the _process(delta) function with pass in its body. Inside _ready(), print print("Döngü hazır").

Show example solution

extends Node2D

func _process(delta):
    pass

func _ready():
    print("Döngü hazır")

Test yourself

What does the delta parameter passed to the _process(delta) function represent?
- Time elapsed since the last frame in seconds
- Total count of nodes in the scene tree
- Total frame count in the game
- Aspect ratio of the screen resolution
Show answer

Time elapsed since the last frame in seconds — delta represents the time elapsed from the previous frame to this one (in seconds).

_process function parameter

extends Node2D

func _process(____):
    pass

Show answer

extends Node2D

func _process(delta):
    pass

Game Loop Components

_process()

Loop function called once per frame
delta

Time elapsed between two frames
FPS

Frames processed per second
Bağımsız hareket

Frame-independent speed using delta

Next lesson: Summary - Node and Scene

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