Add XRServer.world_origin property

doc/classes/XRServer.xml

@@ -108,6 +108,10 @@
 		<member name="primary_interface" type="XRInterface" setter="set_primary_interface" getter="get_primary_interface">
 			The primary [XRInterface] currently bound to the [XRServer].
 		</member>
+		<member name="world_origin" type="Transform3D" setter="set_world_origin" getter="get_world_origin" default="Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0)">
+			The current origin of our tracking space in the virtual world. This is used by the renderer to properly position the camera with new tracking data.
+			[b]Note:[/b] This property is managed by the current [XROrigin3D] node. It is exposed for access from GDExtensions.
+		</member>
 		<member name="world_scale" type="float" setter="set_world_scale" getter="get_world_scale" default="1.0">
 			Allows you to adjust the scale to your game's units. Most AR/VR platforms assume a scale of 1 game world unit = 1 real world meter.
 		</member>

servers/xr_server.cpp

@@ -52,11 +52,14 @@ XRServer *XRServer::get_singleton() {
 void XRServer::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_world_scale"), &XRServer::get_world_scale);
 	ClassDB::bind_method(D_METHOD("set_world_scale", "scale"), &XRServer::set_world_scale);
+	ClassDB::bind_method(D_METHOD("get_world_origin"), &XRServer::get_world_origin);
+	ClassDB::bind_method(D_METHOD("set_world_origin", "world_origin"), &XRServer::set_world_origin);
 	ClassDB::bind_method(D_METHOD("get_reference_frame"), &XRServer::get_reference_frame);
 	ClassDB::bind_method(D_METHOD("center_on_hmd", "rotation_mode", "keep_height"), &XRServer::center_on_hmd);
 	ClassDB::bind_method(D_METHOD("get_hmd_transform"), &XRServer::get_hmd_transform);
 
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "world_scale"), "set_world_scale", "get_world_scale");
+	ADD_PROPERTY(PropertyInfo(Variant::VECTOR3, "world_origin"), "set_world_origin", "get_world_origin");
 
 	ClassDB::bind_method(D_METHOD("add_interface", "interface"), &XRServer::add_interface);
 	ClassDB::bind_method(D_METHOD("get_interface_count"), &XRServer::get_interface_count);