GARSession(Geospatial) Category

GARSession(Geospatial) Category Reference

Overview

Category adding Geospatial functionality to GARSession.

Instance Method Summary

(BOOL) - isGeospatialModeSupported:
 Determines whether the given geospatial mode is supported on the current device and OS version. More...
 
(nullable GARAnchor *) - createAnchorWithCoordinate:altitude:eastUpSouthQAnchor:error:
 Creates a Geospatial anchor at the specified geodetic location and orientation relative to the Earth. More...
 

Method Detail

- (BOOL) isGeospatialModeSupported: (GARGeospatialMode)  geospatialMode

Determines whether the given geospatial mode is supported on the current device and OS version.

If this returns NO, then configuring the session with the given geospatial mode will fail with the error code GARSessionErrorCodeConfigurationNotSupported. A device may be incompatible with a given mode due to insufficient sensor capabilities.

Parameters
geospatialModeThe geospatial mode.
Returns
YES if the geospatialMode is supported, NO otherwise.

Extends class GARSession.

- (nullable GARAnchor *) createAnchorWithCoordinate: (CLLocationCoordinate2D)  coordinate
altitude: (CLLocationDistance)  altitude
eastUpSouthQAnchor: (simd_quatf)  eastUpSouthQAnchor
error: (NSError **)  error 

Creates a Geospatial anchor at the specified geodetic location and orientation relative to the Earth.

Latitude and longitude are defined by the WGS84 specification, and altitude values are defined as the elevation above the WGS84 ellipsoid in meters.

The rotation provided by eastUpSouthQAnchor is a rotation with respect to an east-up-south coordinate frame. An identity rotation will have the anchor oriented such that X+ points to the east, Y+ points up away from the center of the earth, and Z+ points to the south.

To create an anchor that has the +Z axis pointing in the same direction as heading obtained from GARGeospatialTransform, use the following formula:

{qx, qy, qz, qw} = {0, sin((pi - heading * pi / 180.0) / 2), 0, cos((pi -
heading * pi / 180.0) / 2)}}.

An anchor's GARAnchor.trackingState will be GARTrackingStatePaused while GAREarth is GARTrackingStatePaused. The tracking state will permanently become GARTrackingStateStopped if the GARSession configuration is set to GARGeospatialModeDisabled.

Creating anchors near the north pole or south pole is not supported. If the latitude is within 0.1° of the north pole or south pole (90° or -90 °), this function will output GARSessionErrorCodeInvalidArgument and the anchor will fail to be created.

Parameters
coordinateThe latitude and longitude associated with the location, specified using the WGS84 reference frame. This must not be within .1° of the North or South pole (i.e. +- 90°).
altitudeAltitude in reference to the WGS 84 ellipsoid, in meters. Positive values indicate altitudes above approximate sea level. Negative values indicate altitudes below approximate sea level.
eastUpSouthQAnchorRepresents the quaternion from the anchor to East-Up-South (EUS) coordinates (i.e., +X points East, +Y points up, and +Z points South).
errorOut param for an NSError. Possible error codes: GARSessionErrorCodeIllegalState - current geospatial mode is disabled. GARSessionErrorCodeInvalidArgument - latitude is not within range.
Returns
The new anchor, or nil if there was an error.

Extends class GARSession.