Delta

Part of the Nodes and Scenes section of Coddy's Godot journey. Lesson 8 of 27.

Not every computer draws 60 frames a second. A fast screen draws 144, and a busy phone may draw 30. A robot that moves 2 pixels a frame is fast on one and slow on the other.

Godot passes delta to _process(delta) on every frame. It is the seconds since the last frame: about 0.0167 at 60 frames a second, about 0.033 at 30.

Multiply a move by delta to make it a move per second:

func _process(delta):
	position.y += 60 * delta

That moves the node 60 pixels each second on every computer.

Challenge

Easy

Make the robot move right at 100 pixels a second, using delta.

Try it yourself

extends Node2D

func _process(delta):
	position.x += 2

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Nodes and Scenes

1Your First Godot Game

What Is Godot?Ready Runs Once Print in Godot The Scene Tree Set a Position Move a Node Once

4Finding Nodes

The Dollar Sign Node Paths Onready Change a Color Hide and Show

2Every Frame

Process Runs Every FrameDeltaPixels per Second Move Diagonally Spin With Rotation Grow With Scale

5Project: Screensaver

Screensaver: Drift Screensaver: Side Walls

Screensaver: Top and Bottom

Screensaver: New Colors

3Values You Can Tune

Variables on a Node Constants Export Variables Vector2 Math Wrap Around the Screen Your Own Functions

Practice on your own: Godot playground