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"),
+    }
+}

src/xr_input/debug_gizmos.rs

@@ -1,4 +1,6 @@
-use bevy::prelude::{Color, Gizmos, Plugin, Quat, Res, Transform, Update, Vec2, Vec3};
+use bevy::prelude::{
+    info, Color, Gizmos, Plugin, Quat, Query, Res, Transform, Update, Vec2, Vec3, With, PreUpdate,
+};
 
 use crate::{
     input::XrInput,
@@ -7,7 +9,7 @@ use crate::{
 
 use crate::xr_input::{
     oculus_touch::{OculusController, OculusControllerRef},
-    Hand, QuatConv, Vec3Conv,
+    Hand, QuatConv, TrackingRoot, Vec3Conv,
 };
 
 /// add debug renderer for controllers
@@ -27,17 +29,33 @@ pub fn draw_gizmos(
     xr_input: Res<XrInput>,
     instance: Res<XrInstance>,
     session: Res<XrSession>,
+    tracking_root_query: Query<(&mut Transform, With<TrackingRoot>)>,
 ) {
     //lock frame
     let frame_state = *frame_state.lock().unwrap();
     //get controller
     let controller = oculus_controller.get_ref(&instance, &session, &frame_state, &xr_input);
+    //tracking root?
+    let mut tracking_position = Vec3::ZERO;
+    let root = tracking_root_query.get_single();
+    match root {
+        Ok(position) => {
+            gizmos.circle(position.0.translation, Vec3::Y, 0.2, Color::RED);
+            tracking_position = position.0.translation;
+        }
+        Err(_) => info!("too many tracking roots"),
+    }
     //draw the hands
-    draw_hand_gizmo(&mut gizmos, &controller, Hand::Right);
-    draw_hand_gizmo(&mut gizmos, &controller, Hand::Left);
+    draw_hand_gizmo(&mut gizmos, &controller, Hand::Right, tracking_position);
+    draw_hand_gizmo(&mut gizmos, &controller, Hand::Left, tracking_position);
 }
 
-fn draw_hand_gizmo(gizmos: &mut Gizmos, controller: &OculusControllerRef<'_>, hand: Hand) {
+fn draw_hand_gizmo(
+    gizmos: &mut Gizmos,
+    controller: &OculusControllerRef<'_>,
+    hand: Hand,
+    tracking_root: Vec3,
+) {
     match hand {
         Hand::Left => {
             //get left controller
@@ -51,7 +69,7 @@ fn draw_hand_gizmo(gizmos: &mut Gizmos, controller: &OculusControllerRef<'_>, ha
             let grip_quat_offset = Quat::from_rotation_x(-1.4);
             let face_quat_offset = Quat::from_rotation_x(1.05);
 
-            let controller_vec3 = left_controller.0.pose.position.to_vec3();
+            let controller_vec3 = left_controller.0.pose.position.to_vec3() + tracking_root;
             let controller_quat = left_controller.0.pose.orientation.to_quat();
             let face_quat = controller_quat.mul_quat(face_quat_offset);
             let face_quat_normal = face_quat.mul_vec3(Vec3::Z);
@@ -158,7 +176,7 @@ fn draw_hand_gizmo(gizmos: &mut Gizmos, controller: &OculusControllerRef<'_>, ha
             let grip_quat_offset = Quat::from_rotation_x(-1.4);
             let face_quat_offset = Quat::from_rotation_x(1.05);
 
-            let controller_vec3 = right_controller.0.pose.position.to_vec3();
+            let controller_vec3 = right_controller.0.pose.position.to_vec3() + tracking_root;
             let controller_quat = right_controller.0.pose.orientation.to_quat();
             let face_quat = controller_quat.mul_quat(face_quat_offset);
             let face_quat_normal = face_quat.mul_vec3(Vec3::Z);

src/xr_input/mod.rs

@@ -10,11 +10,11 @@ use crate::xr_input::oculus_touch::{setup_oculus_controller, ActionSets};
 use crate::xr_input::xr_camera::{xr_camera_head_sync, Eye, XRProjection, XrCameraBundle};
 use bevy::app::{App, PostUpdate, Startup};
 use bevy::log::warn;
-use bevy::prelude::IntoSystemConfigs;
-use bevy::prelude::{Commands, Plugin, PreUpdate, Quat, Res, Vec3};
+use bevy::prelude::{default, Commands, Component, Plugin, PreUpdate, Quat, Res, Vec3};
+use bevy::prelude::{BuildChildren, IntoSystemConfigs};
 use bevy::render::camera::CameraProjectionPlugin;
 use bevy::render::view::{update_frusta, VisibilitySystems};
-use bevy::transform::TransformSystem;
+use bevy::transform::{TransformBundle, TransformSystem};
 
 #[derive(Copy, Clone)]
 pub struct OpenXrInput {
@@ -25,6 +25,10 @@ pub enum Hand {
     Left,
     Right,
 }
+
+#[derive(Component)]
+pub struct TrackingRoot;
+
 impl OpenXrInput {
     pub fn new(controller_type: XrControllerType) -> Self {
         Self { controller_type }
@@ -52,8 +56,12 @@ impl Plugin for OpenXrInput {
 }
 
 fn setup_xr_cameras(mut commands: Commands) {
-    commands.spawn(XrCameraBundle::new(Eye::Right));
-    commands.spawn(XrCameraBundle::new(Eye::Left));
+    //this needs to do the whole xr tracking volume not just cameras
+    //get the root?
+    let tracking_root = commands.spawn((TransformBundle { ..default() }, TrackingRoot)).id();
+    let right = commands.spawn(XrCameraBundle::new(Eye::Right)).id();
+    let left = commands.spawn(XrCameraBundle::new(Eye::Left)).id();
+    commands.entity(tracking_root).push_children(&[right, left]);
 }
 
 fn action_set_system(action_sets: Res<ActionSets>, session: Res<XrSession>) {

src/xr_input/xr_camera.rs

@@ -46,6 +46,7 @@ pub enum XrCameraType {
     Xr(Eye),
     Flatscreen,
 }
+
 #[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, Ord, PartialOrd)]
 pub enum Eye {
     Left = 0,