13 lines
870 B
Markdown
13 lines
870 B
Markdown
|
---
|
||
|
|
uid: arsubsystems-raycast-subsystem
|
||
|
|
---
|
||
|
|
# XR raycast subsystem
|
||
|
|
|
||
|
|
Raycasts allow you to perform hit testing against AR-specific features. They use the same concept as the [Physics.Raycast](https://docs.unity3d.com/ScriptReference/Physics.Raycast.html), but raycast targets don't require a presence in the physics world.
|
||
|
|
|
||
|
|
There are two types of raycasts:
|
||
|
|
- [Screen point](xref:UnityEngine.XR.ARSubsystems.XRRaycastSubsystem.Raycast(UnityEngine.Vector2,UnityEngine.XR.ARSubsystems.TrackableType,Unity.Collections.Allocator))
|
||
|
|
- [Arbitrary ray](xref:UnityEngine.XR.ARSubsystems.XRRaycastSubsystem.Raycast(UnityEngine.Ray,UnityEngine.XR.ARSubsystems.TrackableType,Unity.Collections.Allocator))
|
||
|
|
|
||
|
|
Some implementations only support one or the other. You can check for support with [XRRaycastSubsystemDescriptor](xref:UnityEngine.XR.ARSubsystems.XRRaycastSubsystemDescriptor).
|