Shape casting allows to detect collision objects by sweeping its [member shape] along the cast direction determined by [member target_position]. This is similar to [RayCast2D], but it allows for sweeping a region of space, rather than just a straight line. [ShapeCast2D] can detect multiple collision objects. It is useful for things like wide laser beams or snapping a simple shape to a floor.
Immediate collision overlaps can be done with the [member target_position] set to [code]Vector2(0, 0)[/code] and by calling [method force_shapecast_update] within the same physics frame. This helps to overcome some limitations of [Area2D] when used as an instantaneous detection area, as collision information isn't immediately available to it.
[b]Note:[/b] Shape casting is more computationally expensive than ray casting.
Updates the collision information for the shape immediately, without waiting for the next [code]_physics_process[/code] call. Use this method, for example, when the shape or its parent has changed state.
Returns the fraction from this cast's origin to its [member target_position] of how far the shape can move without triggering a collision, as a value between [code]0.0[/code] and [code]1.0[/code].
Returns the fraction from this cast's origin to its [member target_position] of how far the shape must move to trigger a collision, as a value between [code]0.0[/code] and [code]1.0[/code].
In ideal conditions this would be the same as [method get_closest_collision_safe_fraction], however shape casting is calculated in discrete steps, so the precise point of collision can occur between two calculated positions.
Returns the collided [Object] of one of the multiple collisions at [param index], or [code]null[/code] if no object is intersecting the shape (i.e. [method is_colliding] returns [code]false[/code]).
Returns the shape ID of the colliding shape of one of the multiple collisions at [param index], or [code]0[/code] if no object is intersecting the shape (i.e. [method is_colliding] returns [code]false[/code]).
The number of collisions detected at the point of impact. Use this to iterate over multiple collisions as provided by [method get_collider], [method get_collider_shape], [method get_collision_point], and [method get_collision_normal] methods.
The shape's collision mask. Only objects in at least one collision layer enabled in the mask will be detected. See [url=$DOCS_URL/tutorials/physics/physics_introduction.html#collision-layers-and-masks]Collision layers and masks[/url] in the documentation for more information.
Returns the complete collision information from the collision sweep. The data returned is the same as in the [method PhysicsDirectSpaceState2D.get_rest_info] method.
