implement rotation of objects

src/actor.rs

@@ -10,7 +10,10 @@ impl Plugin for ActorPlugin {
         app.add_systems(Startup, setup);
         app.register_type::<ChatBranch>();
         app.register_type::<ChatChoice>();
-        app.add_systems(FixedUpdate, update);
+        app.add_systems(FixedUpdate, (
+            update_physics_lifeforms,
+            update_physics_actors,
+        ));
         app.add_systems(Update, (
             handle_new_conversations,
             handle_conversations,
@@ -30,7 +33,7 @@ pub struct Actor {
     pub hp: f32,
     pub m: f32, // mass
     pub v: Vec3, // velocity
-    // TODO: rotation
+    pub angular_momentum: Quat,
 }
 
 impl Default for Actor {
@@ -39,6 +42,7 @@ impl Default for Actor {
             hp: 100.0,
             m: 100.0,
             v: Vec3::ZERO,
+            angular_momentum: Quat::from_euler(EulerRot::XYZ, 0.001, 0.01, 0.003),
         }
     }
 }
@@ -118,7 +122,16 @@ pub fn setup(
     });
 }
 
-pub fn update(
+pub fn update_physics_actors(
+    time: Res<Time>,
+    mut q_actors: Query<(&mut Actor, &mut Transform)>,
+) {
+    for (actor, mut transform) in q_actors.iter_mut() {
+        transform.rotate(actor.angular_momentum);
+    }
+}
+
+pub fn update_physics_lifeforms(
     time: Res<Time>,
     mut query: Query<(&mut LifeForm, &mut Suit)>,
 ) {

src/world.rs

@@ -68,7 +68,10 @@ pub fn setup(
     // Add player
     commands.spawn((
         actor::Player,
-        actor::Actor::default(),
+        actor::Actor {
+            angular_momentum: Quat::IDENTITY,
+            ..default()
+        },
         actor::LifeForm::default(),
         actor::Suit {
             oxygen: nature::OXY_M,