Kilobyte Cinema

aurore — a polar night over a frozen fjord vibedemo (29 KB, 2:13)

Kilobyte Cinema — Sat, 07 Nov 2026 19:13:14 GMT

A polar night over a frozen fjord: aurora borealis curtains mirrored in a still lake, snow mountains under the moon, the milky way and falling snow, and a lone cabin with warm windows and chimney smoke. A keyframed camera glides from the shore, circles the cabin, rises over the lake and ends looking up at the sky.

72 BPM ambient in A minor, 40 bars, 2:13. A single 29 KB executable for Linux x86_64 (OpenGL 3.3 + SDL2), no external files: the scene is raymarched from signed-distance functions in a fragment shader, and the music is synthesized in C at startup. Every pixel and every note is computed in real time while the program runs.

More vibedemos on this channel: https://videos.coopix.eu/c/kilobytecinema/videos

Sources on https://git.coopix.eu/public/demo_test

atlas — a flight through nine worlds: real-time 3D vibedemo in 5 KB (5,622 bytes)

Kilobyte Cinema — Sat, 07 Nov 2026 15:43:10 GMT

A continuous flight through nine worlds, sixteen seconds each: an ocean at dawn with islands and sailboats, a desert with pyramids and hot-air balloons, a forest at sunset, a city at night with flying cars, an ice canyon full of crystals, a temple on the water at dusk, an asteroid field with a station, floating islands above the clouds, and a last flyover of the ocean, climbing toward the sun. House at 120 BPM, 2:24.

This is not an animated film: it is a 5 KB (5,622 bytes) Linux program that computes everything while it runs. There is no video, no texture, no 3D model and no audio file. The scenery is made of mathematical formulas drawn with raymarching in an OpenGL shader, and the music is synthesized on the GPU by a fragment shader, one stereo sample per pixel. Every movement is locked to the music, so the demo plays exactly the same every time.

Rendered frame by frame from the program, 1080p at 60 fps.

Sources in https://git.coopix.eu/public/demo_test

drone — atlas filmed by a drone: real-time 3D vibedemo in 6 KB (6,189 bytes)

Kilobyte Cinema — Sat, 07 Nov 2026 15:37:45 GMT

The nine worlds of "atlas" seen from a drone: fast runs skimming the scenery, climbs that reveal the landscape, dives, and orbits around a monument — two eight-second shots per world, cut on the beat. House at 120 BPM, 2:24.

This is not an animated film: it is a 6 KB (6,189 bytes) Linux program that computes everything while it runs. There is no video, no texture, no 3D model and no audio file. The scenery is made of mathematical formulas drawn with raymarching in an OpenGL shader, and the music is synthesized on the GPU by a fragment shader, one stereo sample per pixel. Every movement is locked to the music, so the demo plays exactly the same every time.

Same worlds and same music as "atlas", only the camera changes. Rendered frame by frame from the program, 1080p at 60 fps.

Sources on https://git.coopix.eu/public/demo_test

mime — real-time 3D vibedemo in 34 KB (34,392 bytes)

Kilobyte Cinema — Sat, 07 Nov 2026 13:46:30 GMT

A mime alone under a theatre spotlight, in front of a red velvet curtain. White greasepaint, arched painted eyebrows, a black teardrop, red lips, a beret and a striped shirt. He opens his eyes and starts pulling faces in time with a waltz: surprise, laughter, a wink, puffed cheeks, anger, disgust, fear, a kiss. Each expression snaps into place on the beat. A sad interlude in cold light, a lively reprise with one face per beat, then the spotlight closes in on him and goes out. A soft, slightly melancholic waltz in D minor with music box, piano, pizzicato bass and strings, 2:24.

This is not an animated film: it is a 34 KB (34,392 bytes) Linux program that computes everything while it runs. There is no video, no texture, no 3D model and no audio file. The face is sculpted from mathematical formulas and drawn with raymarching in OpenGL shaders: skin grain, expression wrinkles, light glowing through the skin and reflections in the eyes. The music is synthesized by the program itself at startup. Every movement is locked to the music, so the demo plays exactly the same every time.

Rendered frame by frame from the program, 1080p at 60 fps.

redline — real-time 3D vibedemo in 35 KB (35,616 bytes)

Kilobyte Cinema — Sat, 07 Nov 2026 13:42:31 GMT

A night race through a city. The engine idles under the starting lights, the lights turn green and the race begins: wet asphalt reflecting the street lamps, rivals overtaken, a neon-lit tunnel, then a slow-motion breath before the nitro kicks in. At full speed it sprints to the checkered flag. Fast cuts between chase, hood, roadside, aerial and low-angle cameras, with motion blur and camera shake locked to the beat. Drum and bass at 174 BPM in A minor, with a synthesized engine roaring through the gear changes, 2:01.

This is not an animated film: it is a 35 KB (35,616 bytes) Linux program that computes everything while it runs. There is no video, no texture, no 3D model and no audio file. The car, the road and the city are made of mathematical formulas drawn with raymarching in OpenGL shaders, and the music and the engine sound are synthesized by the program itself at startup. Every movement is locked to the music, so the demo plays exactly the same every time.

Rendered frame by frame from the program, 1080p at 60 fps.

Sources on https://git.coopix.eu/public/demo_test

orbit — real-time 3D vibedemo in 27 KB (27,424 bytes)

Kilobyte Cinema — Sat, 07 Nov 2026 10:42:10 GMT

Chrome spheres and neon rings turning step by step on the beat, above a mirror floor. Techno at 140 BPM in A minor, 2:00.

This is not an animated film: it is a 27 KB (27,424 bytes) Linux program that computes everything while it runs. There is no video, no texture, no 3D model and no audio file. The scenery is made of mathematical formulas drawn with raymarching in OpenGL shaders, and the music is synthesized by the program itself at startup. Every movement is locked to the music, so the demo plays exactly the same every time.

Rendered frame by frame from the program, 1080p at 60 fps.

https://git.coopix.eu/public/demo_test

sea — real-time 3D vibedemo in 27 KB (27,424 bytes)

Kilobyte Cinema — Sat, 07 Nov 2026 10:41:44 GMT

A dive from the surface down to the abyss: reef, jellyfish, then the darkness of the deep. Underwater dub techno at 120 BPM, 2:30.

Rendered frame by frame from the program, 1080p at 60 fps.

https://git.coopix.eu/public/demo_test

vertige — real-time 3D vibedemo in 35 KB (35,616 bytes)

Kilobyte Cinema — Sat, 07 Nov 2026 10:41:27 GMT

The nested worlds of "abyme", above an ocean of mercury, under a nebula and a ringed gas giant. Satellites nest inside each other endlessly and reflect one another. Their panels are brushed chrome, gold or anodized metal with portholes, and every kick drum sends waves across the mercury. Techno at 140 BPM in A minor, 2:00.

This is not an animated film: it is a 35 KB (35,616 bytes) Linux program that computes everything while it runs. There is no video, no texture, no 3D model and no audio file. The scenery is made of mathematical formulas drawn with raymarching in OpenGL shaders, and the music is synthesized by the program itself at startup. Every movement is locked to the music, so the demo plays exactly the same every time.

Rendered frame by frame from the program, 1080p at 60 fps.
The same demo also runs on an Amiga 500: see "vertige (Amiga 500)" on this channel.

https://git.coopix.eu/public/demo_test

vertige (Amiga 500) — 24 KB vibedemo on a bootable floppy

Kilobyte Cinema — Sat, 07 Nov 2026 10:40:57 GMT

"vertige" remade for a stock Amiga 500, the 1987 home computer: 68000 CPU at 7 MHz, 512 KB of memory, no expansion. Same score (techno at 140 BPM in A minor), same structure and the same endless dive from one satellite into the next, over 2:00.

It ships as a floppy that boots on its own, without Workbench or any operating system, like the demos of the era. The program is 24 KB (24,486 bytes), on an 880 KB floppy that is almost empty. Everything the PC version computes with raymarching was rebuilt with the Amiga's custom chips:
– the blitter draws the rings and spheres as wireframes, with three levels of nested satellites;
– the copper builds the mercury ocean and the mirror ceiling by choosing, line by line, which line of the image to display. It also makes the waves ripple, and every kick drum makes them swell;
– the nebula, the stars and the gas giant are dithered, and the copper changes their colors on every line;
– the music is synthesized at startup, with no stored samples, and played on Paula's four 8-bit voices.

Captured in the FS-UAE emulator (A500 configuration), at 50 fps PAL.
PC version: see "vertige" on this channel.

https://git.coopix.eu/public/demo_test

forge — real-time 3D vibedemo in 27 KB (27,424 bytes)

Kilobyte Cinema — Sat, 07 Nov 2026 00:09:57 GMT

A torch-lit vaulted corridor leads to a round hall, where a stone sphere floats above a lava pit, circled by iron rings engraved with runes. Gothic industrial at 128 BPM in E Phrygian, 2:00.

Rendered frame by frame from the program, 1080p at 60 fps.

https://git.coopix.eu/public/demo_test

abyme — orbit, recursively: real-time 3D vibedemo in 27 KB (27,424 bytes)

Kilobyte Cinema — Sat, 07 Nov 2026 00:09:02 GMT

orbit, nested inside itself: each chrome sphere carries six satellites that are scaled-down copies of the whole system. Light bounces three to five times between the spheres, and the camera dives endlessly from one satellite into the next. Techno at 140 BPM in A minor, 2:00.

Sequel to "orbit". Rendered frame by frame from the program, 1080p at 60 fps.

https://git.coopix.eu/public/demo_test