diff --git a/src/camera.rs b/src/camera.rs
index a2929aa..ec580ae 100644
--- a/src/camera.rs
+++ b/src/camera.rs
@@ -1,26 +1,29 @@
 #![allow(dead_code)]
 
+use mem_arena::MemArena;
+
 use lerp::lerp_slice;
 use math::{Vector, Point, Matrix4x4};
 use ray::Ray;
 use sampling::square_to_circle;
 
 
-#[derive(Debug)]
-pub struct Camera {
-    transforms: Vec<Matrix4x4>,
-    fovs: Vec<f32>,
-    tfovs: Vec<f32>,
-    aperture_radii: Vec<f32>,
-    focus_distances: Vec<f32>,
+#[derive(Copy, Clone, Debug)]
+pub struct Camera<'a> {
+    transforms: &'a [Matrix4x4],
+    fovs: &'a [f32],
+    tfovs: &'a [f32],
+    aperture_radii: &'a [f32],
+    focus_distances: &'a [f32],
 }
 
-impl Camera {
-    pub fn new(transforms: Vec<Matrix4x4>,
+impl<'a> Camera<'a> {
+    pub fn new(arena: &'a mut MemArena,
+               transforms: Vec<Matrix4x4>,
                fovs: Vec<f32>,
                mut aperture_radii: Vec<f32>,
                mut focus_distances: Vec<f32>)
-               -> Camera {
+               -> Camera<'a> {
         assert!(transforms.len() != 0, "Camera has no transform(s)!");
         assert!(fovs.len() != 0, "Camera has no fov(s)!");
 
@@ -48,14 +51,14 @@ impl Camera {
         }
 
         // Convert angle fov into linear fov.
-        let tfovs = fovs.iter().map(|n| (n / 2.0).sin() / (n / 2.0).cos()).collect();
+        let tfovs: Vec<f32> = fovs.iter().map(|n| (n / 2.0).sin() / (n / 2.0).cos()).collect();
 
         Camera {
-            transforms: transforms,
-            fovs: fovs,
-            tfovs: tfovs,
-            aperture_radii: aperture_radii,
-            focus_distances: focus_distances,
+            transforms: arena.copy_slice(&transforms),
+            fovs: arena.copy_slice(&fovs),
+            tfovs: arena.copy_slice(&tfovs),
+            aperture_radii: arena.copy_slice(&aperture_radii),
+            focus_distances: arena.copy_slice(&focus_distances),
         }
     }
 
diff --git a/src/main.rs b/src/main.rs
index 0fa90eb..191cbb6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,5 @@
+extern crate mem_arena;
+
 extern crate crossbeam;
 extern crate docopt;
 extern crate lodepng;
@@ -45,6 +47,8 @@ use std::path::Path;
 
 use docopt::Docopt;
 
+use mem_arena::MemArena;
+
 use parse::{parse_scene, DataTree};
 use ray::{Ray, AccelRay};
 use renderer::LightPath;
@@ -131,7 +135,9 @@ fn main() {
             t.tick();
             if child.type_name() == "Scene" {
                 println!("Building scene...");
-                let mut r = parse_scene(child).unwrap();
+
+                let mut arena = MemArena::new();
+                let mut r = parse_scene(&mut arena, child).unwrap();
 
                 if let Some(spp) = args.flag_spp {
                     println!("\tOverriding scene spp: {}", spp);
diff --git a/src/parse/psy.rs b/src/parse/psy.rs
index c2f3f33..0535acb 100644
--- a/src/parse/psy.rs
+++ b/src/parse/psy.rs
@@ -5,6 +5,8 @@ use std::result::Result;
 use nom;
 use nom::IResult;
 
+use mem_arena::MemArena;
+
 use camera::Camera;
 use color::{XYZ, rec709e_to_xyz};
 use light::WorldLightSource;
@@ -27,7 +29,9 @@ pub enum PsyParseError {
 
 
 /// Takes in a DataTree representing a Scene node and returns
-pub fn parse_scene(tree: &DataTree) -> Result<Renderer, PsyParseError> {
+pub fn parse_scene<'a>(arena: &'a mut MemArena,
+                       tree: &'a DataTree)
+                       -> Result<Renderer<'a>, PsyParseError> {
     // Verify we have the right number of each section
     if tree.iter_children_with_type("Output").count() != 1 {
         let count = tree.iter_children_with_type("Output").count();
@@ -61,7 +65,8 @@ pub fn parse_scene(tree: &DataTree) -> Result<Renderer, PsyParseError> {
         .unwrap())?;
 
     // Parse camera
-    let camera = parse_camera(tree.iter_children_with_type("Camera").nth(0).unwrap())?;
+    let camera = parse_camera(arena,
+                              tree.iter_children_with_type("Camera").nth(0).unwrap())?;
 
     // Parse world
     let world = parse_world(tree.iter_children_with_type("World").nth(0).unwrap())?;
@@ -205,7 +210,9 @@ fn parse_render_settings(tree: &DataTree) -> Result<((u32, u32), u32, u32), PsyP
 
 
 
-fn parse_camera(tree: &DataTree) -> Result<Camera, PsyParseError> {
+fn parse_camera<'a>(arena: &'a mut MemArena,
+                    tree: &'a DataTree)
+                    -> Result<Camera<'a>, PsyParseError> {
     if let &DataTree::Internal { ref children, .. } = tree {
         let mut mats = Vec::new();
         let mut fovs = Vec::new();
@@ -259,7 +266,7 @@ fn parse_camera(tree: &DataTree) -> Result<Camera, PsyParseError> {
             }
         }
 
-        return Ok(Camera::new(mats, fovs, aperture_radii, focus_distances));
+        return Ok(Camera::new(arena, mats, fovs, aperture_radii, focus_distances));
     } else {
         return Err(PsyParseError::UnknownError);
     }
diff --git a/src/parse/psy_assembly.rs b/src/parse/psy_assembly.rs
index dc1c209..ae06a47 100644
--- a/src/parse/psy_assembly.rs
+++ b/src/parse/psy_assembly.rs
@@ -96,7 +96,7 @@ pub fn parse_assembly(tree: &DataTree) -> Result<Assembly, PsyParseError> {
                 "SurfaceShader" => {
                     if let &DataTree::Internal { ident: Some(ident), .. } = child {
                         // TODO
-                        unimplemented!()
+                        //unimplemented!()
                     } else {
                         // TODO: error condition of some kind, because no ident
                         panic!();
diff --git a/src/renderer.rs b/src/renderer.rs
index 94d318f..938a1aa 100644
--- a/src/renderer.rs
+++ b/src/renderer.rs
@@ -23,15 +23,15 @@ use transform_stack::TransformStack;
 
 
 #[derive(Debug)]
-pub struct Renderer {
+pub struct Renderer<'a> {
     pub output_file: String,
     pub resolution: (usize, usize),
     pub spp: usize,
     pub seed: u32,
-    pub scene: Scene,
+    pub scene: Scene<'a>,
 }
 
-impl Renderer {
+impl<'a> Renderer<'a> {
     pub fn render(&self, max_samples_per_bucket: u32, thread_count: u32) -> Image {
         let mut tpool = Pool::new(thread_count);
 
diff --git a/src/scene/scene.rs b/src/scene/scene.rs
index cfc68e0..55e9bb0 100644
--- a/src/scene/scene.rs
+++ b/src/scene/scene.rs
@@ -1,3 +1,5 @@
+use mem_arena::MemArena;
+
 use accel::LightAccel;
 use algorithm::weighted_choice;
 use camera::Camera;
@@ -11,14 +13,14 @@ use super::World;
 
 
 #[derive(Debug)]
-pub struct Scene {
+pub struct Scene<'a> {
     pub name: Option<String>,
-    pub camera: Camera,
+    pub camera: Camera<'a>,
     pub world: World,
     pub root: Assembly,
 }
 
-impl Scene {
+impl<'a> Scene<'a> {
     pub fn sample_lights(&self,
                          xform_stack: &mut TransformStack,
                          n: f32,