RayCast2D

Inherits: Node2D < CanvasItem < Node < Object

Query the closest object intersecting a ray.

Description

A RayCast represents a line from its origin to its destination position, cast_to. It is used to query the 2D space in order to find the closest object along the path of the ray.

RayCast2D can ignore some objects by adding them to the exception list via add_exception, by setting proper filtering with collision layers, or by filtering object types with type masks.

RayCast2D can be configured to report collisions with Area2Ds (collide_with_areas) and/or PhysicsBody2Ds (collide_with_bodies).

Only enabled raycasts will be able to query the space and report collisions.

RayCast2D calculates intersection every physics frame (see Node), and the result is cached so it can be used later until the next frame. If multiple queries are required between physics frames (or during the same frame) use force_raycast_update after adjusting the raycast.

Tutorials

Property Descriptions

DefaultVector2( 0, 50 )
Setterset_cast_to(value)
Getterget_cast_to()

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


  • bool collide_with_areas
Defaultfalse
Setterset_collide_with_areas(value)
Getteris_collide_with_areas_enabled()

If true, collision with Area2Ds will be reported.


  • bool collide_with_bodies
Defaulttrue
Setterset_collide_with_bodies(value)
Getteris_collide_with_bodies_enabled()

If true, collision with PhysicsBody2Ds will be reported.


  • int collision_mask
Default1
Setterset_collision_mask(value)
Getterget_collision_mask()

The ray’s collision mask. Only objects in at least one collision layer enabled in the mask will be detected.


Defaultfalse
Setterset_enabled(value)
Getteris_enabled()

If true, collisions will be reported.


Defaulttrue
Setterset_exclude_parent_body(value)
Getterget_exclude_parent_body()

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

Method Descriptions

  • void add_exception ( Object node )

Adds a collision exception so the ray does not report collisions with the specified 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. Use this method to update the collision information immediately instead of waiting for the next _physics_process call, for example if the ray or its parent has changed state.

Note: enabled == true is not required for this to work.


Returns the first object that the ray intersects, or null 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).


  • bool get_collision_mask_bit ( int bit ) const

Returns an individual bit on the collision mask.


  • Vector2 get_collision_normal ( ) const

Returns the normal of the intersecting object’s shape at the collision point.


  • Vector2 get_collision_point ( ) const

Returns the collision point at which the ray intersects the closest object.

Note: this point is in the global coordinate system.


  • bool is_colliding ( ) const

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


  • void remove_exception ( Object node )

Removes a collision exception so the ray does report collisions with the specified 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_bit ( int bit, bool value )

Sets or clears individual bits on the collision mask. This makes selecting the areas scanned easier.

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