diff --git a/Cargo.lock b/Cargo.lock
index 607ec02..6746b4e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -100,6 +100,18 @@ dependencies = [
  "libloading",
 ]
 
+[[package]]
+name = "async-channel"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "89b47800b0be77592da0afd425cc03468052844aff33b84e33cc696f64e77b6a"
+dependencies = [
+ "concurrent-queue",
+ "event-listener-strategy",
+ "futures-core",
+ "pin-project-lite",
+]
+
 [[package]]
 name = "atomic-waker"
 version = "1.1.2"
@@ -401,6 +413,27 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
+[[package]]
+name = "event-listener"
+version = "5.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6032be9bd27023a771701cc49f9f053c751055f71efb2e0ae5c15809093675ba"
+dependencies = [
+ "concurrent-queue",
+ "parking",
+ "pin-project-lite",
+]
+
+[[package]]
+name = "event-listener-strategy"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c3e4e0dd3673c1139bf041f3008816d9cf2946bbfac2945c09e523b8d7b05b2"
+dependencies = [
+ "event-listener",
+ "pin-project-lite",
+]
+
 [[package]]
 name = "fdeflate"
 version = "0.3.7"
@@ -453,6 +486,12 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "aa9a19cbb55df58761df49b23516a86d432839add4af60fc256da840f66ed35b"
 
+[[package]]
+name = "futures-core"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05f29059c0c2090612e8d742178b0580d2dc940c837851ad723096f87af6663e"
+
 [[package]]
 name = "gethostname"
 version = "0.4.3"
@@ -1117,6 +1156,12 @@ dependencies = [
  "ttf-parser",
 ]
 
+[[package]]
+name = "parking"
+version = "2.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f38d5652c16fde515bb1ecef450ab0f6a219d619a7274976324d5e377f7dceba"
+
 [[package]]
 name = "parking_lot"
 version = "0.12.3"
@@ -1257,6 +1302,12 @@ version = "1.0.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "afbdc74edc00b6f6a218ca6a5364d6226a259d4b8ea1af4a0ea063f27e179f4d"
 
+[[package]]
+name = "quick-error"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a993555f31e5a609f617c12db6250dedcac1b0a85076912c436e6fc9b2c8e6a3"
+
 [[package]]
 name = "quick-xml"
 version = "0.36.2"
@@ -1340,6 +1391,7 @@ checksum = "20675572f6f24e9e76ef639bc5552774ed45f1c30e2951e1e99c59888861c539"
 name = "raytracing3"
 version = "0.1.0"
 dependencies = [
+ "async-channel",
  "bytemuck",
  "glam",
  "image",
diff --git a/Cargo.toml b/Cargo.toml
index 25494a2..3fb1065 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,6 +14,7 @@ opt-level = 3
 opt-level = 3
 
 [dependencies]
+async-channel = "2.3.1"
 bytemuck = { version = "1.21.0", features = ["derive"] }
 glam = { version = "0.29.2", features = ["bytemuck"] }
 image = { version = "0.25.5", default-features = false, features = ["png", "jpeg", "webp"] }
diff --git a/src/bin/rec.rs b/src/bin/rec.rs
new file mode 100644
index 0000000..646146e
--- /dev/null
+++ b/src/bin/rec.rs
@@ -0,0 +1,172 @@
+use std::env::args;
+use std::error::Error;
+use std::fs;
+use std::path::PathBuf;
+use std::sync::Arc;
+
+use glam::{uvec2, UVec2};
+use image::buffer::ConvertBuffer;
+use raytracing3::present::{self, Presenter};
+use raytracing3::scene::{load_envmap, Renderer, SceneParams};
+
+const SIZE: UVec2 = uvec2(1920, 1080);
+const FRAME_RATE: u32 = 60;
+const DURATION_SECONDS: u32 = 120;
+const N_FRAMES: u32 = DURATION_SECONDS * FRAME_RATE;
+const N_SPHERES: u32 = 100;
+const RAYS_PER_PIXEL: u32 = 1024;
+
+fn main() {
+	let args: Vec<_> = args().collect();
+	let [_, path] = args.as_slice() else {
+		panic!("invalid arguments");
+	};
+	let path: PathBuf = path.into();
+	fs::create_dir(&path).expect("failed to create the output directory");
+
+	std::thread::scope(|s| {
+		let (img_sender, img_receiver) = async_channel::bounded::<(u32, Arc<wgpu::Buffer>)>(50);
+		for _ in 0..16 {
+			let img_receiver = img_receiver.clone();
+			let path = &path;
+			s.spawn(move || {
+				while let Ok((frame, buffer)) = img_receiver.recv_blocking() {
+					let img = image::RgbaImage::from_raw(SIZE.x, SIZE.y, buffer.slice(..).get_mapped_range().to_vec())
+						.expect("read failure!");
+					let img: image::RgbImage = img.convert();
+					img.save(path.join(&format!("frame{frame:06}.webp")))
+						.expect("save failure!");
+				}
+			});
+		}
+		do_work(img_sender);
+	});
+}
+
+fn do_work(img_sender: async_channel::Sender<(u32, Arc<wgpu::Buffer>)>) {
+	let img_sender = Arc::new(img_sender);
+
+	let (device, queue) = pollster::block_on(init_gpu()).unwrap();
+	let envmap = load_envmap(&device, &queue);
+	queue.submit([]);
+
+	let texsize = wgpu::Extent3d {
+		width: SIZE.x,
+		height: SIZE.y,
+		depth_or_array_layers: 1,
+	};
+
+	let output_format = wgpu::TextureFormat::Rgba8UnormSrgb;
+	let hdr_format = wgpu::TextureFormat::Rgba16Float;
+
+	let scene = SceneParams::new(N_SPHERES);
+	let renderer = Renderer::new(&device, envmap);
+	let presenter = Presenter::new(&device, output_format);
+
+	for frame in 0..N_FRAMES {
+		let output = device.create_texture(&wgpu::TextureDescriptor {
+			label: None,
+			size: texsize,
+			mip_level_count: 1,
+			sample_count: 1,
+			dimension: wgpu::TextureDimension::D2,
+			format: output_format,
+			usage: wgpu::TextureUsages::RENDER_ATTACHMENT | wgpu::TextureUsages::COPY_SRC,
+			view_formats: &[],
+		});
+		let view = output.create_view(&wgpu::TextureViewDescriptor::default());
+		let hdr = device.create_texture(&wgpu::TextureDescriptor {
+			label: None,
+			size: texsize,
+			mip_level_count: 1,
+			sample_count: 1,
+			dimension: wgpu::TextureDimension::D2,
+			format: hdr_format,
+			usage: wgpu::TextureUsages::RENDER_ATTACHMENT | wgpu::TextureUsages::TEXTURE_BINDING,
+			view_formats: &[],
+		});
+		let hdr = hdr.create_view(&wgpu::TextureViewDescriptor::default());
+		let mut encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor { label: None });
+		{
+			let mut render_pass = renderer.prepare(&mut encoder, &hdr);
+			for subframe in 0..RAYS_PER_PIXEL {
+				let subframe = frame * RAYS_PER_PIXEL + subframe;
+				let time = subframe as f32 / (RAYS_PER_PIXEL * FRAME_RATE) as f32;
+				renderer.render_frame(&device, &mut render_pass, SIZE, &scene, time, subframe);
+			}
+		}
+		presenter.render(
+			&device,
+			&mut encoder,
+			&hdr,
+			&view,
+			present::Params {
+				divisor: RAYS_PER_PIXEL as f32,
+			},
+		);
+		let buffer = device.create_buffer(&wgpu::BufferDescriptor {
+			label: None,
+			size: (4 * SIZE.x * SIZE.y) as u64,
+			usage: wgpu::BufferUsages::COPY_DST | wgpu::BufferUsages::MAP_READ,
+			mapped_at_creation: false,
+		});
+		encoder.copy_texture_to_buffer(
+			wgpu::ImageCopyTexture {
+				texture: &output,
+				mip_level: 0,
+				origin: wgpu::Origin3d::ZERO,
+				aspect: wgpu::TextureAspect::All,
+			},
+			wgpu::ImageCopyBuffer {
+				buffer: &buffer,
+				layout: wgpu::ImageDataLayout {
+					offset: 0,
+					bytes_per_row: Some(4 * SIZE.x),
+					rows_per_image: Some(SIZE.y),
+				},
+			},
+			texsize,
+		);
+		queue.submit([encoder.finish()]);
+		let buffer = Arc::new(buffer);
+		let img_sender = Arc::clone(&img_sender);
+		Arc::clone(&buffer)
+			.slice(..)
+			.map_async(wgpu::MapMode::Read, move |res| {
+				res.unwrap();
+				img_sender.send_blocking((frame, buffer)).unwrap();
+			});
+	}
+	device.poll(wgpu::Maintain::Wait);
+}
+
+async fn init_gpu() -> Result<(wgpu::Device, wgpu::Queue), Box<dyn Error>> {
+	let instance = wgpu::Instance::new(wgpu::InstanceDescriptor {
+		backends: wgpu::Backends::PRIMARY,
+		..Default::default()
+	});
+	let adapter = instance
+		.request_adapter(&wgpu::RequestAdapterOptions {
+			power_preference: wgpu::PowerPreference::default(),
+			compatible_surface: None,
+			force_fallback_adapter: false,
+		})
+		.await
+		.unwrap();
+	let (device, queue) = adapter
+		.request_device(
+			&wgpu::DeviceDescriptor {
+				label: None,
+				required_features: wgpu::Features::PUSH_CONSTANTS,
+				required_limits: wgpu::Limits {
+					max_push_constant_size: 128,
+					..Default::default()
+				},
+				memory_hints: Default::default(),
+			},
+			None,
+		)
+		.await
+		.unwrap();
+	Ok((device, queue))
+}