diff --git a/src/doodad.rs b/src/doodad.rs
index f949c66..e5dabc0 100644
--- a/src/doodad.rs
+++ b/src/doodad.rs
@@ -6,6 +6,7 @@ pub struct Doodad {
 	pub sprite: String,
 	pub pos: Point2<Pfloat>,
 	pub parallax: Pfloat,
+	pub height: Pfloat,
 }
 
 impl Spriteable for Doodad {
@@ -15,6 +16,7 @@ impl Spriteable for Doodad {
 			name: self.sprite.clone(),
 			angle: Deg { 0: 0.0 },
 			scale: 1.0,
+			height: self.height,
 			parallax: self.parallax,
 		};
 	}
diff --git a/src/main.rs b/src/main.rs
index 8c36faa..4589467 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -27,11 +27,11 @@ use crate::{
 
 #[derive(Debug, Clone, Copy)]
 struct Camera {
-	// Camera center
+	/// Camera center
 	pos: Point2<Pfloat>,
 
-	// Camera zoom
-	// (How many game units tall is the viewport?)
+	/// Camera zoom
+	/// (How many game units tall is the viewport?)
 	zoom: Pfloat,
 }
 
@@ -40,29 +40,35 @@ trait Spriteable {
 }
 
 struct Sprite {
-	// Name of the sprite to draw
+	/// Name of the sprite to draw
 	name: String,
 
-	// This object's position, in world coordinates.
+	/// This object's position, in world coordinates.
 	pos: Point2<Pfloat>,
 
+	/// The size of this sprite,
+	/// given as height in world units.
+	height: Pfloat,
+
+	/// Scale factor.
+	/// if this is 1, sprite height is exactly self.height.
 	scale: Pfloat,
 
-	// This sprite's rotation
-	// (relative to north, measured ccw)
+	/// This sprite's rotation
+	/// (relative to north, measured ccw)
 	angle: Deg<Pfloat>,
 
-	// Parallax factor.
-	// More positive => farther away
-	// More negative => closer
-	// Zero: no parallax.
+	/// Parallax factor.
+	/// More positive => farther away
+	/// More negative => closer
+	/// Zero: no parallax.
 	parallax: Pfloat,
 }
 
 impl Sprite {
 	const PARALLAX_STRENGTH: Pfloat = 0.1;
 
-	// Returns post-parallax position in game coordinates.
+	/// Returns post-parallax position in game coordinates.
 	pub fn post_parallax_position(&self, camera: Camera) -> Point2<f32> {
 		let v = camera.pos.to_vec() - self.pos.to_vec();
 		return self.pos + (v * self.parallax * Self::PARALLAX_STRENGTH);
diff --git a/src/render/gpustate.rs b/src/render/gpustate.rs
index c5e3b1a..e94da15 100644
--- a/src/render/gpustate.rs
+++ b/src/render/gpustate.rs
@@ -269,7 +269,7 @@ impl GPUState {
 			// but we omit the division.
 			// This gives us a small margin, and lets us re-use the value
 			// without an extra multiply.
-			let height = texture.height * s.scale;
+			let height = s.height * s.scale;
 			let width = height * texture.aspect;
 
 			// Don't draw (or compute matrices for)
diff --git a/src/render/texturearray.rs b/src/render/texturearray.rs
index da70c1c..904d0d8 100644
--- a/src/render/texturearray.rs
+++ b/src/render/texturearray.rs
@@ -16,7 +16,6 @@ pub struct TextureArray {
 pub struct Texture {
 	pub index: u32,  // Index in texture array
 	pub aspect: f32, // width / height
-	pub height: f32, // Height in game units
 }
 
 #[derive(Deserialize)]
@@ -29,7 +28,6 @@ struct Textures {
 struct Tex {
 	name: String,
 	path: String,
-	height: f32,
 }
 
 impl Tex {
@@ -68,7 +66,6 @@ impl TextureArray {
 			let raw = texture_index.error.read(device, queue)?;
 			let error_texture = Texture {
 				index: 0,
-				height: texture_index.error.height,
 				aspect: raw.dimensions.0 as f32 / raw.dimensions.1 as f32,
 			};
 			texture_data.push(raw);
@@ -79,7 +76,6 @@ impl TextureArray {
 				let raw = t.read(device, queue)?;
 				let tx = Texture {
 					index: i,
-					height: t.height,
 					aspect: raw.dimensions.0 as f32 / raw.dimensions.1 as f32,
 				};
 				textures.insert(t.name.clone(), tx);
diff --git a/src/ship.rs b/src/ship.rs
index 3a1bf78..01ba18a 100644
--- a/src/ship.rs
+++ b/src/ship.rs
@@ -12,6 +12,12 @@ impl ShipKind {
 			Self::Gypsum => "gypsum",
 		}
 	}
+
+	fn height(&self) -> Pfloat {
+		match self {
+			Self::Gypsum => 100.0,
+		}
+	}
 }
 
 pub struct Ship {
@@ -36,6 +42,7 @@ impl Spriteable for Ship {
 			angle: self.body.angle,
 			scale: 1.0,
 			parallax: 0.0,
+			height: self.kind.height(),
 		};
 	}
 }
diff --git a/src/system.rs b/src/system.rs
index 5344a53..37303bf 100644
--- a/src/system.rs
+++ b/src/system.rs
@@ -13,6 +13,7 @@ impl System {
 			pos: (0.0, 0.0).into(),
 			sprite: "a0".to_owned(),
 			parallax: 3.0,
+			height: 80.0,
 		});
 
 		s.bodies.push(Doodad {
@@ -24,6 +25,7 @@ impl System {
 			.to_cartesian(),
 			sprite: "earth".to_owned(),
 			parallax: 1.0,
+			height: 120.0,
 		});
 
 		s.bodies.push(Doodad {
@@ -35,6 +37,7 @@ impl System {
 			.to_cartesian(),
 			sprite: "small".to_owned(),
 			parallax: -1.0,
+			height: 50.0,
 		});
 
 		return s;