diff --git a/src/main.rs b/src/main.rs
index dc87eb9..0e86499 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -16,18 +16,23 @@ mod render;
 mod ship;
 mod system;
 
+pub const ZOOM_MIN: Pfloat = 200.0;
+pub const ZOOM_MAX: Pfloat = 2000.0;
+
 // Z-axis range for starfield stars
 pub const STARFIELD_PARALLAX_MIN: f32 = 100.0;
 pub const STARFIELD_PARALLAX_MAX: f32 = 200.0;
-// Number of stars in one starfield tile
-pub const STARFIELD_COUNT: u64 = 100;
 // Size of a square starfield tile, in game units.
 // A tile of size PARALLAX_MAX * screen-size-in-game-units
 // will completely cover a (square) screen. This depends on zoom!
-pub const STARFIELD_SIZE: u64 = STARFIELD_PARALLAX_MAX as u64 * 500;
-
-pub const ZOOM_MIN: Pfloat = 200.0;
-pub const ZOOM_MAX: Pfloat = 2000.0;
+//
+// Use a value smaller than zoom_max for debug.
+pub const STARFIELD_SIZE: u64 = STARFIELD_PARALLAX_MAX as u64 * ZOOM_MAX as u64;
+// Average number of stars per game unit
+pub const STARFIELD_DENSITY: f64 = 0.01;
+// Number of stars in one starfield tile
+// Must fit inside an i32
+pub const STARFIELD_COUNT: u64 = (STARFIELD_SIZE as f64 * STARFIELD_DENSITY) as u64;
 
 use crate::{
 	doodad::Doodad,
diff --git a/src/render/gpustate.rs b/src/render/gpustate.rs
index 99bc378..4b8b7f1 100644
--- a/src/render/gpustate.rs
+++ b/src/render/gpustate.rs
@@ -5,7 +5,7 @@ use std::{iter, rc::Rc};
 use wgpu;
 use winit::{self, dpi::PhysicalSize, window::Window};
 
-use crate::{Game, STARFIELD_COUNT, STARFIELD_PARALLAX_MIN, STARFIELD_SIZE, ZOOM_MAX};
+use crate::{Game, STARFIELD_COUNT, STARFIELD_PARALLAX_MIN, STARFIELD_SIZE, ZOOM_MAX, ZOOM_MIN};
 
 use super::{
 	globaldata::{GlobalData, GlobalDataContent},
@@ -217,7 +217,8 @@ impl GPUState {
 
 		for s in game.sprites() {
 			// Parallax is computed here, so we can check if this sprite is visible.
-			let pos = (s.pos - game.camera.pos.to_vec()) / s.parallax;
+			let pos =
+				(s.pos - game.camera.pos.to_vec()) / (s.parallax + game.camera.zoom / ZOOM_MIN);
 			let texture = self.texture_array.get_texture(&s.name[..]);
 
 			// Game dimensions of this sprite post-scale.