Class GestureTransformationUtility

Provides helper functions for common functionality to transform objects in AR.

Inheritance

object

GestureTransformationUtility

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: UnityEngine.XR.Interaction.Toolkit.AR

Assembly: Unity.XR.Interaction.Toolkit.dll

Syntax

public static class GestureTransformationUtility

Methods

GetBestPlacementPosition(Vector3, Vector2, float, float, float, GestureTranslationMode, XROrigin, TrackableType, int)

Calculates the best position to place an object in AR based on screen position. Could be used for tapping a location on the screen, dragging an object, or using a fixed cursor in the center of the screen for placing and moving objects.

Declaration

public static GestureTransformationUtility.Placement GetBestPlacementPosition(Vector3 currentAnchorPosition, Vector2 screenPosition, float groundingPlaneHeight, float hoverOffset, float maxTranslationDistance, GestureTransformationUtility.GestureTranslationMode gestureTranslationMode, XROrigin sessionOrigin, TrackableType trackableTypes = null, int fallbackLayerMask = 0)

Parameters

Type	Name	Description
Vector3	currentAnchorPosition	Position of the parent anchor, i.e., where the object is before translation starts.
Vector2	screenPosition	Location on the screen in pixels to place the object at.
float	groundingPlaneHeight	The starting height of the plane to place the object on.
float	hoverOffset	How much should the object hover above the groundingPlane before it has been placed.
float	maxTranslationDistance	The maximum distance allowed to translate the object.
GestureTransformationUtility.GestureTranslationMode	gestureTranslationMode	The translation mode, indicating the plane types allowed.
XROrigin	sessionOrigin	The Unity.XR.CoreUtils.XROrigin used for ray casting.
TrackableType	trackableTypes	(Optional) The types of trackables to cast against.
int	fallbackLayerMask	(Optional) The LayerMask that Unity uses during an additional ray cast when no trackables are hit. Defaults to Nothing which skips the fallback ray cast.

Returns

Type	Description
GestureTransformationUtility.Placement	Returns the best placement position.

Remarks

Unity places objects along the x/z of the grounding plane. When placed on an AR plane below the grounding plane, the object will drop straight down onto it in world space. This prevents the object from being pushed deeper into the scene when moving from a higher plane to a lower plane. When moving from a lower plane to a higher plane, this function returns a new groundingPlane to replace the old one.

Raycast(Vector2, List<ARRaycastHit>, XROrigin, TrackableType, int)

Cast a ray from a point in screen space against trackables, i.e., detected features such as planes. Can optionally fallback to hit test against Colliders in the loaded Scenes when no trackables were hit.

Declaration

public static bool Raycast(Vector2 screenPoint, List<ARRaycastHit> hitResults, XROrigin sessionOrigin, TrackableType trackableTypes = null, int fallbackLayerMask = 0)

Parameters

Type	Name	Description
Vector2	screenPoint	The point, in device screen pixels, from which to cast.
List<ARRaycastHit>	hitResults	Contents are replaced with the ray cast results, if successful.
XROrigin	sessionOrigin	The Unity.XR.CoreUtils.XROrigin used for ray casting.
TrackableType	trackableTypes	(Optional) The types of trackables to cast against.
int	fallbackLayerMask	(Optional) The LayerMask that Unity uses during an additional ray cast when no trackables are hit. Defaults to Nothing which skips the fallback ray cast.

Returns

Type	Description
bool	Returns true if the ray cast hit a trackable in the trackableTypes or if the fallback ray cast hit. Otherwise, returns false.

Remarks

Unity uses the 3D physics scene of the camera when performing the fallback ray cast.