diff --git a/engine/src/scene/content/components/particle_system.rs b/engine/src/scene/content/components/particle_system.rs
index a59cc41..69a1aec 100644
--- a/engine/src/scene/content/components/particle_system.rs
+++ b/engine/src/scene/content/components/particle_system.rs
@@ -379,11 +379,11 @@ impl ParticleSystem {
         &self,
         recorder: &mut CommandBufferRecorder<'_>,
         pipeline: &Arc<Pipeline>,
-        world: &World,
+        now: Duration,
     ) -> Result<()> {
         recorder.bind_pipeline(pipeline)?;
         recorder.bind_descriptor_sets_minimal(&[&self.descriptor_set]);
-        recorder.push_constants(VK_SHADER_STAGE_COMPUTE_BIT, &world.now().as_secs_f32());
+        recorder.push_constants(VK_SHADER_STAGE_COMPUTE_BIT, &now.as_secs_f32());
         recorder.dispatch(self.particle_buffer.size() as u32, 1, 1);
 
         recorder.buffer_barrier(
diff --git a/engine/src/scene/scene/scene_base.rs b/engine/src/scene/scene/scene_base.rs
index e7417f5..7a72f2b 100644
--- a/engine/src/scene/scene/scene_base.rs
+++ b/engine/src/scene/scene/scene_base.rs
@@ -142,8 +142,8 @@ impl Scene {
         world.add_update(
             "animate",
             5_500_000,
-            |world: &mut World, _entity, draw: &mut Draw, animation: &mut Animation| {
-                animation.animate(world.now(), draw)?;
+            |commands: &mut Commands, _entity, draw: &mut Draw, animation: &mut Animation| {
+                animation.animate(commands.now(), draw)?;
 
                 Ok(())
             },
@@ -153,11 +153,14 @@ impl Scene {
         world.add_update(
             "particle_system",
             5_000_000,
-            |world: &mut World, entity, particle_system: &mut ParticleSystem| {
-                let now = world.now();
+            |commands: &mut Commands,
+             entity,
+             particle_system: &mut ParticleSystem,
+             scene: &mut Scene| {
+                let now = commands.now();
 
                 if !particle_system.update(now) {
-                    world.remove_entity(entity);
+                    commands.remove_entity(entity);
                     return Ok(());
                 }
 
@@ -167,13 +170,11 @@ impl Scene {
                         VkCommandBufferBeginInfo::new(VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT);
                     begin_info.set_inheritance_info(&inheritance_info);
 
-                    let scene = world.resources.get_mut_unchecked::<Scene>();
-
                     let particle_handles = scene.particle_system_vulkan_objects_mut();
                     let pipeline = particle_handles.pipeline.clone();
                     let mut recorder = particle_handles.begin(begin_info)?;
 
-                    particle_system.animate(&mut recorder, &pipeline, world)?;
+                    particle_system.animate(&mut recorder, &pipeline, now)?;
                 }
 
                 Ok(())
diff --git a/examples/free_space/src/game.rs b/examples/free_space/src/game.rs
index a3eef2d..627204b 100644
--- a/examples/free_space/src/game.rs
+++ b/examples/free_space/src/game.rs
@@ -321,21 +321,21 @@ impl Game {
 // updates
 impl Game {
     fn player_orientation(
-        world: &mut World,
+        commands: &mut Commands,
         _entity: Entity,
         draw: &mut Draw,
         control: &mut FreeSpaceControl,
     ) -> Result<()> {
-        control.update(world.now());
+        control.update(commands.now());
         draw.set_transform(control.transform())
     }
 
     fn camera_update(
-        world: &mut World,
+        _commands: &mut Commands,
         _entity: Entity,
         control: &mut FreeSpaceControl,
+        scene: &mut Scene,
     ) -> Result<()> {
-        let scene: &mut Scene = world.resources.get_mut()?;
         let view = scene.view_mut();
 
         view.camera_mut()
@@ -349,7 +349,7 @@ impl Game {
     }
 
     fn celestial_buffer_update(
-        _: &mut World,
+        _commands: &mut Commands,
         _: Entity,
         draw: &mut Draw,
         control: &mut CelestialObjectSettings,
@@ -360,7 +360,7 @@ impl Game {
     }
 
     fn celestial_velocity_update(
-        world: &mut World,
+        commands: &mut Commands,
         (_, draw, lhs_control, reference): (
             Entity,
             &mut Draw,
@@ -370,7 +370,7 @@ impl Game {
         (rhs_entity, rhs_control): (Entity, &mut CelestialObjectSettings),
     ) -> Result<()> {
         if reference.entity == rhs_entity {
-            lhs_control.update(world.now(), draw, rhs_control)?;
+            lhs_control.update(commands.now(), draw, rhs_control)?;
         }
 
         Ok(())