diff --git a/.gitignore b/.gitignore
index ac2fab7..73ab246 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
+/cache
 /target
-*.ignore
\ No newline at end of file
+*.ignore
diff --git a/content/ship.toml b/content/ship.toml
index 46e8030..986c34e 100644
--- a/content/ship.toml
+++ b/content/ship.toml
@@ -1,5 +1,5 @@
 [ship."Gypsum"]
-sprite = "ship::peregrine"
+sprite = "ship::gypsum"
 size = 100
 mass = 1
 hull = 200
diff --git a/crates/constants/src/lib.rs b/crates/constants/src/lib.rs
index b1c7a43..ece78af 100644
--- a/crates/constants/src/lib.rs
+++ b/crates/constants/src/lib.rs
@@ -1,6 +1,7 @@
 #![warn(missing_docs)]
 
 //! Compile-time parameters
+// TODO: many of these should be moved to a config file or cli option
 
 /// Minimum zoom level
 pub const ZOOM_MIN: f32 = 200.0;
@@ -61,3 +62,6 @@ pub const SPRITE_LIMIT: u32 = 1024;
 
 /// The maximum number of images we can load
 pub const IMAGE_LIMIT: u32 = 1024;
+
+/// Where we should look for packed assets
+pub const ASSET_CACHE: &'static str = "./cache";
diff --git a/crates/content/src/lib.rs b/crates/content/src/lib.rs
index 2eb45f7..b9197c0 100644
--- a/crates/content/src/lib.rs
+++ b/crates/content/src/lib.rs
@@ -255,6 +255,11 @@ impl Content {
 		return &self.sprites[h.index as usize];
 	}
 
+	/// Get the list of atlas files we may use
+	pub fn atlas_files(&self) -> &Vec<String> {
+		return &self.sprite_atlas.atlas_list;
+	}
+
 	/// Get a sprite from a path
 	pub fn get_image(&self, p: &Path) -> &SpriteAtlasImage {
 		self.sprite_atlas.index.get(p).unwrap()
diff --git a/crates/galactica/src/main.rs b/crates/galactica/src/main.rs
index c877da0..b874b77 100644
--- a/crates/galactica/src/main.rs
+++ b/crates/galactica/src/main.rs
@@ -4,9 +4,12 @@ mod inputstatus;
 
 pub use galactica_content as content;
 
-use anyhow::Result;
-use galactica_constants;
-use std::path::PathBuf;
+use anyhow::{bail, Result};
+use galactica_constants::{self, ASSET_CACHE};
+use std::{
+	fs,
+	path::{Path, PathBuf},
+};
 use winit::{
 	event::{Event, KeyboardInput, WindowEvent},
 	event_loop::{ControlFlow, EventLoop},
@@ -14,11 +17,20 @@ use winit::{
 };
 
 fn main() -> Result<()> {
-	// TODO: error if missing
+	let cache_dir = Path::new(ASSET_CACHE);
+	fs::create_dir_all(cache_dir)?;
+
+	let atlas_index = cache_dir.join("spriteatlas.toml");
+
+	if !atlas_index.exists() {
+		bail!("Could not find sprite atlas!");
+	}
+
+	// TODO: pretty error if missing
 	let content = content::Content::load_dir(
 		PathBuf::from(galactica_constants::CONTENT_ROOT),
 		PathBuf::from(galactica_constants::IMAGE_ROOT),
-		PathBuf::from("spriteatlas.toml"),
+		atlas_index,
 		galactica_constants::STARFIELD_SPRITE_NAME.to_owned(),
 	)?;
 
diff --git a/crates/packer/src/atlasset.rs b/crates/packer/src/atlasset.rs
index ac404f6..80ee0e5 100644
--- a/crates/packer/src/atlasset.rs
+++ b/crates/packer/src/atlasset.rs
@@ -78,8 +78,10 @@ impl AtlasSet {
 	pub fn write_image(&mut self, path: &Path, dim: [u32; 2]) -> Result<usize> {
 		let mut f = File::open(&path)?;
 		let mut bytes = Vec::new();
-		f.read_to_end(&mut bytes)?;
-		let img = image::load_from_memory(&bytes)?;
+		f.read_to_end(&mut bytes)
+			.with_context(|| format!("While reading file `{}`", path.display()))?;
+		let img = image::load_from_memory(&bytes)
+			.with_context(|| format!("While loading file `{}`", path.display()))?;
 
 		let mut x = 0;
 		let mut y = 0;
@@ -179,7 +181,7 @@ impl AtlasSet {
 		self.index.index.insert(
 			p.to_path_buf(),
 			SpriteAtlasImage {
-				atlas: atlas_idx,
+				atlas: atlas_idx as u32,
 				x: x as f32 / self.texture_width as f32,
 				y: y as f32 / self.texture_height as f32,
 				w: dim[0] as f32 / self.texture_width as f32,
@@ -190,13 +192,17 @@ impl AtlasSet {
 		return Ok(atlas_idx);
 	}
 
-	pub fn save_files<F>(self, atlas_path: F, index_path: &Path) -> Result<()>
+	pub fn save_files<F>(mut self, atlas_path: F, index_path: &Path) -> Result<()>
 	where
 		F: Fn(usize) -> PathBuf,
 	{
 		// Save atlases
 		for i in 0..self.texture_list.len() {
-			self.texture_list[i].save(atlas_path(i))?;
+			let path = atlas_path(i);
+			self.texture_list[i].save(&path)?;
+			self.index
+				.atlas_list
+				.push(path.file_name().unwrap().to_str().unwrap().to_owned());
 		}
 
 		// Save index
diff --git a/crates/packer/src/lib.rs b/crates/packer/src/lib.rs
index bcc9c2e..95cc6c1 100644
--- a/crates/packer/src/lib.rs
+++ b/crates/packer/src/lib.rs
@@ -11,7 +11,8 @@ use serde::{Deserialize, Serialize};
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct SpriteAtlasImage {
 	/// The index of the atlas this image is in
-	pub atlas: usize,
+	/// This is an index in SpriteAtlas.atlas_list
+	pub atlas: u32,
 
 	/// x-position of this image
 	/// (between 0 and 1, using wgpu texture coordinates)
@@ -36,6 +37,9 @@ pub struct SpriteAtlasImage {
 pub struct SpriteAtlas {
 	/// The images in this atlas
 	pub index: HashMap<PathBuf, SpriteAtlasImage>,
+
+	/// The file names of the atlas textures we've generated
+	pub atlas_list: Vec<String>,
 }
 
 impl SpriteAtlas {
@@ -43,6 +47,7 @@ impl SpriteAtlas {
 	pub fn new() -> Self {
 		Self {
 			index: HashMap::new(),
+			atlas_list: Vec::new(),
 		}
 	}
 }
diff --git a/crates/packer/src/main.rs b/crates/packer/src/main.rs
index f563dc2..37d7bb4 100644
--- a/crates/packer/src/main.rs
+++ b/crates/packer/src/main.rs
@@ -2,16 +2,16 @@ mod atlasset;
 
 use atlasset::AtlasSet;
 
-use anyhow::{bail, Result};
+use anyhow::{bail, Context, Result};
 use image::io::Reader;
 use std::path::{Path, PathBuf};
 use walkdir::WalkDir;
 
 // TODO: warning when images have extra transparency
-// TODO: don't re-encode. Direct to gpu?
-// (maybe not, tiling is slow. Make it work with files first.)
-// TODO: path for atlas files
 // TODO: dynamic packing (for plugins)
+// TODO: standalone cli (galactica should ask to run this)
+// TODO: randomly assign sprites to textures, for efficiency
+// TODO: group images by use case
 
 fn main() -> Result<()> {
 	let mut files = Vec::new();
@@ -38,8 +38,11 @@ fn main() -> Result<()> {
 			}
 
 			let path = e.path().to_path_buf();
-			let reader = Reader::open(&path)?;
-			let dim = reader.into_dimensions()?;
+			let reader = Reader::open(&path)
+				.with_context(|| format!("While reading file `{}`", path.display()))?;
+			let dim = reader.into_dimensions().with_context(|| {
+				format!("While reading dimensions of file `{}`", path.display())
+			})?;
 			files.push((path, [dim.0, dim.1]));
 			total_dim += dim.0 as f64 * dim.1 as f64;
 		}
diff --git a/crates/render/shaders/object.wgsl b/crates/render/shaders/object.wgsl
index fd382db..769de50 100644
--- a/crates/render/shaders/object.wgsl
+++ b/crates/render/shaders/object.wgsl
@@ -45,7 +45,7 @@ fn vertex_main(
 	out.position = transform * vec4<f32>(vertex.position, 1.0);
 
 	let t = atlas.data[animate(instance, global.current_time.x)];
-	out.texture_index = u32(0);
+	out.texture_index = t.atlas_texture;
 	out.texture_coords = vec2(t.xpos, t.ypos);
 	if vertex.texture_coords.x == 1.0 {
 		out.texture_coords = vec2(out.texture_coords.x + t.width, out.texture_coords.y);
diff --git a/crates/render/shaders/particle.wgsl b/crates/render/shaders/particle.wgsl
index 403dba2..5d1b43d 100644
--- a/crates/render/shaders/particle.wgsl
+++ b/crates/render/shaders/particle.wgsl
@@ -77,7 +77,7 @@ fn vertex_main(
 
 	// Compute texture coordinates
 	let t = atlas.data[animate(instance, age)];
-	out.texture_index = u32(0);
+	out.texture_index = u32(t.atlas_texture);
 	out.texture_coords = vec2(t.xpos, t.ypos);
 	if vertex.texture_coords.x == 1.0 {
 		out.texture_coords = vec2(out.texture_coords.x + t.width, out.texture_coords.y);
diff --git a/crates/render/shaders/starfield.wgsl b/crates/render/shaders/starfield.wgsl
index 599c2dc..fea16f0 100644
--- a/crates/render/shaders/starfield.wgsl
+++ b/crates/render/shaders/starfield.wgsl
@@ -111,7 +111,7 @@ fn vertex_main(
 	// Starfield sprites may not be animated
 	let i = sprites.data[global.starfield_sprite.x].first_frame;
 	let t = atlas.data[i];
-	out.texture_index = u32(0);
+	out.texture_index = u32(t.atlas_texture);
 	out.texture_coords = vec2(t.xpos, t.ypos);
 	if vertex.texture_coords.x == 1.0 {
 		out.texture_coords = vec2(out.texture_coords.x + t.width, out.texture_coords.y);
diff --git a/crates/render/shaders/ui.wgsl b/crates/render/shaders/ui.wgsl
index 55b3f5c..1f80f89 100644
--- a/crates/render/shaders/ui.wgsl
+++ b/crates/render/shaders/ui.wgsl
@@ -49,7 +49,7 @@ fn vertex_main(
 
 	// Pick texture frame
 	let t = atlas.data[animate(instance, global.current_time.x)];
-	out.texture_index = u32(0);
+	out.texture_index = u32(t.atlas_texture);
 	out.texture_coords = vec2(t.xpos, t.ypos);
 	if vertex.texture_coords.x == 1.0 {
 		out.texture_coords = vec2(out.texture_coords.x + t.width, out.texture_coords.y);
diff --git a/crates/render/src/globaluniform/atlascontent.rs b/crates/render/src/globaluniform/atlascontent.rs
index 3570764..4d7e8e9 100644
--- a/crates/render/src/globaluniform/atlascontent.rs
+++ b/crates/render/src/globaluniform/atlascontent.rs
@@ -11,6 +11,11 @@ pub struct ImageLocation {
 	pub ypos: f32,
 	pub width: f32,
 	pub height: f32,
+
+	// The index of the texture this image is in
+	pub atlas_texture: u32,
+
+	pub _padding: [f32; 3],
 }
 
 #[derive(Debug, Copy, Clone)]
diff --git a/crates/render/src/globaluniform/globaluniform.rs b/crates/render/src/globaluniform/globaluniform.rs
index 9dbaea3..ce24071 100644
--- a/crates/render/src/globaluniform/globaluniform.rs
+++ b/crates/render/src/globaluniform/globaluniform.rs
@@ -44,6 +44,12 @@ impl GlobalUniform {
 				ypos: f32,
 				width: f32,
 				height: f32,
+
+				atlas_texture: u32,
+
+				padding_a: f32,
+				padding_b: f32,
+				padding_c: f32,
 			};
 			"#,
 		);
diff --git a/crates/render/src/texturearray.rs b/crates/render/src/texturearray.rs
index d3cf856..1da041a 100644
--- a/crates/render/src/texturearray.rs
+++ b/crates/render/src/texturearray.rs
@@ -4,9 +4,10 @@ use crate::{
 };
 use anyhow::Result;
 use bytemuck::Zeroable;
+use galactica_constants::ASSET_CACHE;
 use galactica_packer::SpriteAtlasImage;
 use image::GenericImageView;
-use std::{fs::File, io::Read, num::NonZeroU32};
+use std::{fs::File, io::Read, num::NonZeroU32, path::Path};
 use wgpu::BindGroupLayout;
 
 pub(crate) struct RawTexture {
@@ -94,11 +95,19 @@ impl TextureArray {
 		// Load all textures
 		let mut texture_data = Vec::new();
 
-		println!("opening image");
-		let mut f = File::open("atlas-0.bmp")?;
-		let mut bytes = Vec::new();
-		f.read_to_end(&mut bytes)?;
-		texture_data.push(RawTexture::from_bytes(&device, &queue, &bytes, "Atlas")?);
+		for a in ct.atlas_files() {
+			println!("opening {a}");
+			let p = Path::new(ASSET_CACHE);
+			let mut f = File::open(p.join(a))?;
+			let mut bytes = Vec::new();
+			f.read_to_end(&mut bytes)?;
+			texture_data.push(RawTexture::from_bytes(
+				&device,
+				&queue,
+				&bytes,
+				&format!("Atlas `{a}`"),
+			)?);
+		}
 
 		let mut image_locations = ImageLocationArray::zeroed();
 		let mut sprite_data = SpriteDataArray::zeroed();
@@ -125,6 +134,8 @@ impl TextureArray {
 					ypos: image.y,
 					width: image.w,
 					height: image.h,
+					atlas_texture: image.atlas,
+					_padding: Default::default(),
 				};
 				image_counter += 1;
 			}
diff --git a/crates/ui/src/radar.rs b/crates/ui/src/radar.rs
index a6c03e9..81af430 100644
--- a/crates/ui/src/radar.rs
+++ b/crates/ui/src/radar.rs
@@ -20,7 +20,7 @@ pub fn build_radar(
 	let hide_range = 0.85;
 	let shrink_distance = 20.0;
 	let system_object_scale = 1.0 / 600.0;
-	let ship_scale = 1.0 / 10.0;
+	let ship_scale = 1.0 / 15.0;
 
 	let (_, player_body) = physics.get_ship_body(player).unwrap();
 	let player_position = util::rigidbody_position(player_body);