first attempt at locomotion

examples/xr.rs

@@ -1,7 +1,11 @@
 use bevy::diagnostic::{FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin};
 use bevy::prelude::*;
 use bevy::transform::components::Transform;
+use bevy_openxr::input::XrInput;
+use bevy_openxr::resources::{XrFrameState, XrInstance, XrSession};
 use bevy_openxr::xr_input::debug_gizmos::OpenXrDebugRenderer;
+use bevy_openxr::xr_input::oculus_touch::OculusController;
+use bevy_openxr::xr_input::{Hand, TrackingRoot};
 use bevy_openxr::DefaultXrPlugins;
 
 fn main() {
@@ -14,6 +18,7 @@ fn main() {
         .add_plugins(LogDiagnosticsPlugin::default())
         .add_plugins(FrameTimeDiagnosticsPlugin)
         .add_systems(Startup, setup)
+        .add_systems(Update, proto_locomotion)
         .run();
 }
 
@@ -36,6 +41,13 @@ fn setup(
         transform: Transform::from_xyz(0.0, 0.5, 0.0),
         ..default()
     });
+        // cube
+        commands.spawn(PbrBundle {
+            mesh: meshes.add(Mesh::from(shape::Cube { size: 0.1 })),
+            material: materials.add(Color::rgb(0.8, 0.0, 0.0).into()),
+            transform: Transform::from_xyz(0.0, 0.5, 1.0),
+            ..default()
+        });
     // light
     commands.spawn(PointLightBundle {
         point_light: PointLight {
@@ -52,3 +64,29 @@ fn setup(
         ..default()
     },));
 }
+
+fn proto_locomotion(
+    time: Res<Time>,
+    mut tracking_root_query: Query<(&mut Transform, With<TrackingRoot>)>,
+    oculus_controller: Res<OculusController>,
+    frame_state: Res<XrFrameState>,
+    xr_input: Res<XrInput>,
+    instance: Res<XrInstance>,
+    session: Res<XrSession>,
+) {
+    //lock frame
+    let frame_state = *frame_state.lock().unwrap();
+    //get controller
+    let controller = oculus_controller.get_ref(&instance, &session, &frame_state, &xr_input);
+    let root = tracking_root_query.get_single_mut();
+    match root {
+        Ok(mut position) => {
+            //do work here?
+            let stick = controller.thumbstick(Hand::Left);
+            let input = Vec3::new(stick.x, 0.0, -stick.y);
+            let speed = 1.0;
+            position.0.translation += input * speed * time.delta_seconds()
+        }
+        Err(_) => info!("too many tracking roots"),
+    }
+}