diff --git a/examples/simple.rs b/examples/simple.rs
index 3d2a1adc62..7e0b53de10 100644
--- a/examples/simple.rs
+++ b/examples/simple.rs
@@ -2,9 +2,9 @@ use bevy::*;
 use bevy::{render::*, asset::{Asset, AssetStorage, Handle}, math, Schedulable};
 use rand::{rngs::StdRng, Rng, SeedableRng, random};
 
-fn build_wander_system(world: &mut World) -> Box<dyn Schedulable> {
+fn build_wander_system() -> Box<dyn Schedulable> {
     let mut rng = StdRng::from_entropy();
-
+    
     SystemBuilder::new("Wander")
         .read_resource::<Time>()
         .with_query(<(
@@ -31,7 +31,7 @@ fn build_wander_system(world: &mut World) -> Box<dyn Schedulable> {
         })
 }
 
-fn build_navigate_system(world: &mut World) -> Box<dyn Schedulable> {
+fn build_navigate_system() -> Box<dyn Schedulable> {
     SystemBuilder::new("Navigate")
         .with_query(<(
             Read<Person>,
@@ -40,7 +40,7 @@ fn build_navigate_system(world: &mut World) -> Box<dyn Schedulable> {
             Write<NavigationPoint>,
         )>::query())
         .build(move |_, world, _, person_query| {
-            for (_, mut translation, mut velocity, mut navigation_point) in person_query.iter(world) {
+            for (_, translation, mut velocity, navigation_point) in person_query.iter(world) {
                 let distance = navigation_point.target - translation.vector;
                 if math::length(&distance) > 0.01 {
                     let direction = distance.normalize();
@@ -52,7 +52,7 @@ fn build_navigate_system(world: &mut World) -> Box<dyn Schedulable> {
         })
 }
 
-fn build_move_system(world: &mut World) -> Box<dyn Schedulable> {
+fn build_move_system() -> Box<dyn Schedulable> {
     SystemBuilder::new("Move")
         .read_resource::<Time>()
         .with_query(<(
@@ -66,7 +66,7 @@ fn build_move_system(world: &mut World) -> Box<dyn Schedulable> {
         })
 }
 
-fn build_print_status_system(world: &mut World) -> Box<dyn Schedulable> {
+fn build_print_status_system() -> Box<dyn Schedulable> {
     let mut elapsed = 0.0;
     SystemBuilder::new("PrintStatus")
         .read_resource::<Time>()
@@ -85,19 +85,23 @@ fn build_print_status_system(world: &mut World) -> Box<dyn Schedulable> {
 
 fn build_spawner_system(world: &mut World) -> Box<dyn Schedulable> {
     let mesh_handle = {
-        let mut mesh_storage = world.resources.get_mut::<AssetStorage<Mesh, MeshType>>().unwrap();
+        let mesh_storage = world.resources.get_mut::<AssetStorage<Mesh, MeshType>>().unwrap();
         mesh_storage.get_named("cube").unwrap()
     };
-    let mut elapsed = 0.0;
+
+    let duration = 1000000.0;
+    let mut elapsed = duration;
+    let batch_size = 1;
+
     SystemBuilder::new("Spawner")
         .read_resource::<Time>()
         .with_query(<(
             Read<Person>,
         )>::query())
-        .build(move |command_buffer, world, time , person_query| {
+        .build(move |command_buffer, _, time , _| {
             elapsed += time.delta_seconds;
-            if elapsed > 0.5 {
-                for i in 0..20 {
+            if elapsed > duration {
+                for _ in 0..batch_size {
                     spawn_person(command_buffer, mesh_handle.clone());
                 }
                 elapsed = 0.0;
@@ -132,17 +136,17 @@ fn main() {
     let plane = Mesh::load(MeshType::Plane{ size: 25 });
     let mut mesh_storage = AssetStorage::<Mesh, MeshType>::new();
 
-    let mesh_handle = mesh_storage.add(cube, "cube");
+    let _ = mesh_storage.add(cube, "cube");
     let plane_handle = mesh_storage.add(plane, "plane");
     world.resources.insert(mesh_storage);
 
     let transform_system_bundle = transform_system_bundle::build(&mut world);
     scheduler.add_systems(ApplicationStage::Update, transform_system_bundle);
-    scheduler.add_system(ApplicationStage::Update, build_wander_system(&mut world));
-    scheduler.add_system(ApplicationStage::Update, build_navigate_system(&mut world));
-    scheduler.add_system(ApplicationStage::Update, build_move_system(&mut world));
+    scheduler.add_system(ApplicationStage::Update, build_wander_system());
+    scheduler.add_system(ApplicationStage::Update, build_navigate_system());
+    scheduler.add_system(ApplicationStage::Update, build_move_system());
     scheduler.add_system(ApplicationStage::Update, build_spawner_system(&mut world));
-    scheduler.add_system(ApplicationStage::Update, build_print_status_system(&mut world));
+    scheduler.add_system(ApplicationStage::Update, build_print_status_system());
 
     world.insert((), vec![
         // plane
@@ -158,7 +162,6 @@ fn main() {
         // lights
         (
             Light {
-                pos: math::vec3(7.0, -5.0, 10.0),
                 color: wgpu::Color {
                     r: 0.5,
                     g: 1.0,
@@ -174,7 +177,6 @@ fn main() {
         ),
         (
             Light {
-                pos: math::vec3(-5.0, 7.0, 10.0),
                 color: wgpu::Color {
                     r: 1.0,
                     g: 0.5,
diff --git a/src/render/light.rs b/src/render/light.rs
index 2bc3cec015..2264be6a91 100644
--- a/src/render/light.rs
+++ b/src/render/light.rs
@@ -1,10 +1,9 @@
-use crate::{math, render::camera};
+use crate::{math, render::camera, Translation};
 use std::ops::Range;
 use zerocopy::{AsBytes, FromBytes};
 
 
 pub struct Light {
-    pub pos: math::Vec3,
     pub color: wgpu::Color,
     pub fov: f32,
     pub depth: Range<f32>,
@@ -19,16 +18,16 @@ pub struct LightRaw {
     pub color: [f32; 4],
 }
 
-impl Light {
-    pub fn to_raw(&self, transform: &math::Mat4) -> LightRaw {
-        let proj = camera::get_projection_matrix(self.fov, 1.0, self.depth.start, self.depth.end) * transform;
+impl LightRaw {
+    pub fn from(light: &Light, transform: &math::Mat4, translation: &Translation) -> LightRaw {
+        let proj = camera::get_projection_matrix(light.fov, 1.0, light.depth.start, light.depth.end) * transform;
         LightRaw {
             proj: proj.into(),
-            pos: [self.pos.x, self.pos.y, self.pos.z, 1.0],
+            pos: [translation.vector.x, translation.vector.y, translation.vector.z, 1.0],
             color: [
-                self.color.r as f32,
-                self.color.g as f32,
-                self.color.b as f32,
+                light.color.r as f32,
+                light.color.g as f32,
+                light.color.b as f32,
                 1.0,
             ],
         }
diff --git a/src/render/shadow/mod.rs b/src/render/shadow/mod.rs
index 80effce9b3..66d7fa1853 100644
--- a/src/render/shadow/mod.rs
+++ b/src/render/shadow/mod.rs
@@ -1,4 +1,4 @@
-use crate::{render::*, asset::*, LocalToWorld};
+use crate::{render::*, asset::*, LocalToWorld, Translation};
 use wgpu::{BindGroupLayout, Buffer, CommandEncoder, Device, VertexBufferDescriptor, SwapChainOutput, SwapChainDescriptor};
 use legion::prelude::*;
 use zerocopy::AsBytes;
@@ -23,7 +23,7 @@ pub struct ShadowUniforms {
 
 impl Pass for ShadowPass {
     fn render(&mut self, device: &Device, _: &SwapChainOutput, encoder: &mut CommandEncoder, world: &mut World) {
-        let mut light_query = <(Read<Light>, Read<LocalToWorld>)>::query();
+        let mut light_query = <(Read<Light>, Read<LocalToWorld>, Read<Translation>)>::query();
         let mut mesh_query = <(Read<Material>, Read<Handle<Mesh>>)>::query();
         let light_count = light_query.iter(world).count();
 
@@ -33,11 +33,11 @@ impl Pass for ShadowPass {
             let total_size = size * light_count;
             let temp_buf_data =
                 device.create_buffer_mapped(total_size, wgpu::BufferUsage::COPY_SRC);
-            for ((light, local_to_world), slot) in light_query
+            for ((light, local_to_world, translation), slot) in light_query
                 .iter(world)
                 .zip(temp_buf_data.data.chunks_exact_mut(size))
             {
-                slot.copy_from_slice(light.to_raw(&local_to_world.0).as_bytes());
+                slot.copy_from_slice(LightRaw::from(&light, &local_to_world.0, &translation).as_bytes());
             }
             encoder.copy_buffer_to_buffer(
                 &temp_buf_data.finish(),
@@ -86,7 +86,7 @@ impl Pass for ShadowPass {
             }
         }
 
-        for (i, (light, _)) in light_query.iter_immutable(world).enumerate() {
+        for (i, (light, _, _)) in light_query.iter_immutable(world).enumerate() {
             // The light uniform buffer already has the projection,
             // let's just copy it over to the shadow uniform buffer.
             encoder.copy_buffer_to_buffer(