diff --git a/src/bin/envmap/main.rs b/src/bin/envmap/main.rs
index 4e49a11..7f4a23b 100644
--- a/src/bin/envmap/main.rs
+++ b/src/bin/envmap/main.rs
@@ -1,4 +1,4 @@
-use std::error::Error;
+use std::{env, error::Error};
 
 use glam::{mat3, vec2, vec3, Mat3, Vec3};
 use image::buffer::ConvertBuffer;
@@ -16,6 +16,8 @@ fn make_viewport(m: Mat3) -> [Vertex; 4] {
 }
 
 fn main() {
+	let args: Vec<_> = env::args().collect();
+	let extent = args.get(1).and_then(|s| s.parse().ok()).unwrap_or(EXTENT);
 	let (device, queue) = pollster::block_on(init_gpu()).unwrap();
 
 	let format = wgpu::TextureFormat::Rgba8UnormSrgb;
@@ -38,8 +40,8 @@ fn main() {
 	let output = device.create_texture(&wgpu::TextureDescriptor {
 		label: None,
 		size: wgpu::Extent3d {
-			width: EXTENT,
-			height: EXTENT,
+			width: extent,
+			height: extent,
 			depth_or_array_layers: 6,
 		},
 		mip_level_count: 1,
@@ -52,7 +54,7 @@ fn main() {
 	let buffers = faces.map(|_| {
 		device.create_buffer(&wgpu::BufferDescriptor {
 			label: None,
-			size: (4 * EXTENT * EXTENT) as u64,
+			size: (4 * extent * extent) as u64,
 			usage: wgpu::BufferUsages::COPY_DST | wgpu::BufferUsages::MAP_READ,
 			mapped_at_creation: false,
 		})
@@ -97,13 +99,13 @@ fn main() {
 				buffer: &buffer,
 				layout: wgpu::ImageDataLayout {
 					offset: 0,
-					bytes_per_row: Some(4 * EXTENT),
-					rows_per_image: Some(EXTENT),
+					bytes_per_row: Some(4 * extent),
+					rows_per_image: Some(extent),
 				},
 			},
 			wgpu::Extent3d {
-				width: EXTENT,
-				height: EXTENT,
+				width: extent,
+				height: extent,
 				depth_or_array_layers: 1,
 			},
 		);
@@ -117,7 +119,7 @@ fn main() {
 		for (face, buf) in buffers.iter().enumerate() {
 			s.spawn(move || {
 				let img =
-					image::RgbaImage::from_raw(EXTENT, EXTENT, buf.slice(..).get_mapped_range().to_vec()).unwrap();
+					image::RgbaImage::from_raw(extent, extent, buf.slice(..).get_mapped_range().to_vec()).unwrap();
 				let img: image::RgbImage = img.convert();
 				img.save(format!("textures/env{face}.jpeg")).unwrap();
 			});