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Using CharacterBody2D/3D

Introduction

Godot offers several collision objects to provide both collision detection and response. Trying to decide which one to use for your project can be confusing. You can avoid problems and simplify development if you understand how each of them works and what their pros and cons are. In this tutorial, we'll look at the CharacterBody2D node and show some examples of how to use it.

Note

While this document uses CharacterBody2D in its examples, the same concepts apply in 3D as well.

What is a character body?

CharacterBody2D is for implementing bodies that are controlled via code. Character bodies detect collisions with other bodies when moving, but are not affected by engine physics properties, like gravity or friction. While this means that you have to write some code to create their behavior, it also means you have more precise control over how they move and react.

Note

This document assumes you're familiar with Godot's various physics bodies. Please read Physics introduction first, for an overview of the physics options.

Tip

A CharacterBody2D can be affected by gravity and other forces, but you must calculate the movement in code. The physics engine will not move a CharacterBody2D.

Movement and collision

When moving a CharacterBody2D, you should not set its position property directly. Instead, you use the move_and_collide() or move_and_slide() methods. These methods move the body along a given vector and detect collisions.

Warning

You should handle physics body movement in the _physics_process() callback.

The two movement methods serve different purposes, and later in this tutorial, you'll see examples of how they work.

move_and_collide

This method takes one required parameter: a Vector2 indicating the body's relative movement. Typically, this is your velocity vector multiplied by the frame timestep (delta). If the engine detects a collision anywhere along this vector, the body will immediately stop moving. If this happens, the method will return a KinematicCollision2D object.

KinematicCollision2D is an object containing data about the collision and the colliding object. Using this data, you can calculate your collision response.

move_and_collide is most useful when you just want to move the body and detect collision, but don't need any automatic collision response. For example, if you need a bullet that ricochets off a wall, you can directly change the angle of the velocity when you detect a collision. See below for an example.

move_and_slide

The move_and_slide() method is intended to simplify the collision response in the common case where you want one body to slide along the other. It is especially useful in platformers or top-down games, for example.

When calling move_and_slide(), the function uses a number of node properties to calculate its slide behavior. These properties can be found in the Inspector, or set in code.

• velocity - default value: Vector2( 0, 0 )

  This property represents the body's velocity vector in pixels per second. move_and_slide() will modify this value automatically when colliding.

• motion_mode - default value: