RayCast2D

Inherits: Node2D < CanvasItem < Node < Object

A ray in 2D space, used to find the first CollisionObject2D it intersects.

Description

A raycast represents a ray from its origin to its target_position that finds the closest CollisionObject2D along its path, if it intersects any.

RayCast2D can ignore some objects by adding them to an exception list, by making its detection reporting ignore Area2Ds (collide_with_areas) or PhysicsBody2Ds (collide_with_bodies), or by configuring physics layers.

RayCast2D calculates intersection every physics frame, and it holds the result until the next physics frame. For an immediate raycast, or if you want to configure a RayCast2D multiple times within the same physics frame, use force_raycast_update.

To sweep over a region of 2D space, you can approximate the region with multiple RayCast2Ds or use ShapeCast2D.

Tutorials

Ray-casting

Properties


bool	collide_with_areas	false
bool	collide_with_bodies	true
int	collision_mask	1
bool	enabled	true
bool	exclude_parent	true
bool	hit_from_inside	false
Vector2	target_position	Vector2(0, 50)

Methods


void	add_exception(node: CollisionObject2D)
void	add_exception_rid(rid: RID)
void	clear_exceptions()
void	force_raycast_update()
Object	get_collider() const
RID	get_collider_rid() const
int	get_collider_shape() const
bool	get_collision_mask_value(layer_number: int) const
Vector2	get_collision_normal() const
Vector2	get_collision_point() const
bool	is_colliding() const
void	remove_exception(node: CollisionObject2D)
void	remove_exception_rid(rid: RID)
void	set_collision_mask_value(layer_number: int, value: bool)

Property Descriptions

bool collide_with_areas = false 🔗

void set_collide_with_areas(value: bool)
bool is_collide_with_areas_enabled()

If true, collisions with Area2Ds will be reported.

bool collide_with_bodies = true 🔗

void set_collide_with_bodies(value: bool)
bool is_collide_with_bodies_enabled()

If true, collisions with PhysicsBody2Ds will be reported.

int collision_mask = 1 🔗

void set_collision_mask(value: int)
int get_collision_mask()

The ray's collision mask. Only objects in at least one collision layer enabled in the mask will be detected. See Collision layers and masks in the documentation for more information.

bool enabled = true 🔗

void set_enabled(value: bool)
bool is_enabled()

If true, collisions will be reported.

bool exclude_parent = true 🔗

void set_exclude_parent_body(value: bool)
bool get_exclude_parent_body()

If true, the parent node will be excluded from collision detection.

bool hit_from_inside = false 🔗

void set_hit_from_inside(value: bool)
bool is_hit_from_inside_enabled()

If true, the ray will detect a hit when starting inside shapes. In this case the collision normal will be Vector2(0, 0). Does not affect concave polygon shapes.

Vector2 target_position = Vector2(0, 50) 🔗

void set_target_position(value: Vector2)
Vector2 get_target_position()

The ray's destination point, relative to the RayCast's position.

Method Descriptions

void add_exception(node: CollisionObject2D) 🔗

Adds a collision exception so the ray does not report collisions with the specified CollisionObject2D node.

void add_exception_rid(rid: RID) 🔗

Adds a collision exception so the ray does not report collisions with the specified RID.

void clear_exceptions() 🔗

Removes all collision exceptions for this ray.

void force_raycast_update() 🔗

Updates the collision information for the ray immediately, without waiting for the next _physics_process call. Use this method, for example, when the ray or its parent has changed state.

Note: enabled does not need to be true for this to work.

Object get_collider() const 🔗

Returns the first object that the ray intersects, or null if no object is intersecting the ray (i.e. is_colliding returns false).

RID get_collider_rid() const 🔗

Returns the RID of the first object that the ray intersects, or an empty RID if no object is intersecting the ray (i.e. is_colliding returns false).

int get_collider_shape() const 🔗

Returns the shape ID of the first object that the ray intersects, or 0 if no object is intersecting the ray (i.e. is_colliding returns false).

To get the intersected shape node, for a CollisionObject2D target, use:

gdscript

var target = get_collider() # A CollisionObject2D.
var shape_id = get_collider_shape() # The shape index in the collider.
var owner_id = target.shape_find_owner(shape_id) # The owner ID in the collider.
var shape = target.shape_owner_get_owner(owner_id)

bool get_collision_mask_value(layer_number: int) const 🔗

Returns whether or not the specified layer of the collision_mask is enabled, given a layer_number between 1 and 32.

Vector2 get_collision_normal() const 🔗

Returns the normal of the intersecting object's shape at the collision point, or Vector2(0, 0) if the ray starts inside the shape and hit_from_inside is true.

Note: Check that is_colliding returns true before calling this method to ensure the returned normal is valid and up-to-date.

Vector2 get_collision_point() const 🔗

Returns the collision point at which the ray intersects the closest object, in the global coordinate system. If hit_from_inside is true and the ray starts inside of a collision shape, this function will return the origin point of the ray.

Note: Check that is_colliding returns true before calling this method to ensure the returned point is valid and up-to-date.

bool is_colliding() const 🔗

Returns whether any object is intersecting with the ray's vector (considering the vector length).

void remove_exception(node: CollisionObject2D) 🔗

Removes a collision exception so the ray does report collisions with the specified CollisionObject2D node.

void remove_exception_rid(rid: RID) 🔗

Removes a collision exception so the ray does report collisions with the specified RID.

void set_collision_mask_value(layer_number: int, value: bool) 🔗

Based on value, enables or disables the specified layer in the collision_mask, given a layer_number between 1 and 32.