The palace

Playground no. 2: up a waterfall, through the doors, to the throne.

The final film: a cream palace with blue roofs, a gilded dome and two spired towers above formal gardens, with snowy mountains behind — Draft 1, inset, and the final film behind it, a day apart.

Draft 1 of the same view: a plain white palace on bare paving — Draft 1, inset, and the final film behind it, a day apart.

Me: Direction and prompts.
Opus 5.5: Anthropic, in Claude Code. The layout, terrain, hall and camera, and every render.
gpt-6.1-sol: OpenAI, in Codex. The skyline, facade, cliffs, waterfall and throne.
gpt-6-astra: OpenAI, in Codex. The first two garden passes.

It started inside

I asked for a grand palace interior with marble floors. Opus 5.5 built a gallery in the spirit of the Hall of Mirrors at Versailles: a diamond marble floor, red marble columns with gilded tops, a coffered ceiling, crystal chandeliers and a crimson carpet up to a throne. It went through five drafts in about five minutes, each a seven-second render at half resolution. It flagged its own problems too: the carpet looked pink in the sun, and the throne was too small to see from the far end.

Hall draft 5: red marble columns, chandeliers, a coffered ceiling and a crimson carpet across black and white marble — The pink carpet, then crimson. This room ends up inside the palace.

Hall draft 2: the long gallery in heavy haze, its carpet washed out to pink in the sun — The pink carpet, then crimson. This room ends up inside the palace.

Then the outside, in five drafts

Draft 1 at 4 s — Four moments from every draft film. Draft 2 only ever existed as stills.

Draft 1 at 12 s — Four moments from every draft film. Draft 2 only ever existed as stills.

Draft 1: A bare first pass
Then I asked for the outside: a palace on the scale of the ones in manhwa, with a camera that flies in through the building. Opus 5.5 started with layout.py, one file holding every measurement: 300 m across the front on a 6 m bay grid, 757 window bays, towers 168 m tall beside a 140 m dome, and 160 m of cliff with the waterfall pouring off it into the lake. The Codex sessions built to those numbers without ever seeing the scene. Three of them, two on gpt-6.1-sol and one on gpt-6-astra, did the skyline, the facade and the grounds while Opus 5.5 did the terrain, the cliff, the lake and the camera. The palace came out white on bare paving, the garden was mostly flat green, and the camera flew like a bird, wobble and all.
Draft 3: A garden, music, and homework
I asked for more detail, a proper garden, better music and a steadier camera, and for Opus 5.5 to learn from Blender tutorials first. The hall moved into the centre block, under the dome. gpt-6-astra rebuilt the grounds, and the music became Scott Buckley's Titan, cut so its first swell lands on the reveal at 12 seconds. Opus 5.5 pulled transcripts from Blender Guru, Jamie Dunbar, Critical Giants, CG Boost and Polyfjord and wrote down what to copy: a sky matched to its sun, fog that sits low and clears higher up, grime rising from the ground, people-sized details for scale, and wide 20 to 24 mm lenses.
Draft 4: Smoothing the flight
The camera was still jerky. Opus 5.5 rebuilt it as one spline through a set of points, resampled so it moves at an even speed, with its aim smoothed over about a second either side and its bank held under 5°. That got rid of the bird wobble.
Draft 3
Draft 4
The hall still renders far too bright.
Draft 5: Real mountains
I asked for real mountains, rocks, haze and lens effects, and for library assets over anything generated. The mountains are now the real Eiger, Mönch and Jungfrau, built from elevation data and turned so their north faces look at the palace, the Eiger about 9.5 km away. gpt-6.1-sol, in Codex, wrote the cliffs, the waterfall and the clouds. The cliffs broke the render first: every wet rock had its own material override, so Cycles copied the geometry 4,746 times and ran out of memory. Opus 5.5 made the wet rocks share one mesh. The garden had the same problem in another form: 190,000 flowers took 13 seconds a frame just to load, so about a fifth of them stayed and the beds' colour does the rest.
Final, draft 6: The waterfall and the throne
Codex took the waterfall, which Opus 5.5 said had to stop looking like white planks. The camera now comes in low over the lake and rises straight up the fall. The throne is built around a carved Baroque chair from BlenderKit, with a canopy, a crown and velvet curtains added by gpt-6.1-sol. The hall rendered about seven times brighter than outside, so the exposure now drops by 0.9 stops as the camera passes through the doors. Then the full render: 648 frames, 10 to 30 seconds each, and about 80 seconds near the waterfall spray.
Draft 5Final
The great fall, from the new head-on camera.

The film

The final film, 27 seconds, with sound.

Direction and prompts: Aman Singh
Layout, terrain, cliff band and lake; the palace's mass and roofs; the marble hall; sky, sun and camera; the lens pass and every render: Opus 5.5 (Anthropic), in Claude Code
Skyline, facade, cliffs, clouds, the waterfall, the throne and the later garden passes: gpt-6.1-sol (OpenAI), in Codex, 14 sessions
The first two garden passes: the staircase, gate, parterres and fountains: gpt-6-astra (OpenAI), in Codex, 2 sessions
Renderer: Blender 5.2 and Cycles, on a MacBook
Length: 27 seconds, 648 frames
Music: “Titan” by Scott Buckley (scottbuckley.com.au), licensed under CC BY 4.0
Mountains: Europe terrain data produced using Copernicus data and information funded by the European Union, EU-DEM layers; Mapzen terrain tiles
Models and textures: Poly Haven and ambientCG (CC0)
Statues: Statens Museum for Kunst plaster-cast scans (public domain)
Chair, cypresses, urns: BlenderKit (royalty free); the Baroque chair is by 14DENDIK

What carried over from no. 1

Drafts from the start.: Opus 5.5 rendered half-resolution drafts at every step and only ran the full render when I asked for it. No. 1 taught me that the expensive way.
Codex sessions built more of it.: Seven modules and 16 sessions, against three modules for the castle. Every module has the same entry point, and they still couldn't render inside the Codex sandbox, so Opus 5.5 dropped each one in, rendered it and fixed what broke.
Assets before generating.: Rocks, plants and textures came from Poly Haven and ambientCG, statues from a museum's scans, the chair, cypresses and urns from BlenderKit. Codex only wrote the pieces no library had.
Still open.: The hall's haze crashes the GPU renderer whenever the camera is inside it, so its sun shafts are painted sheets instead of light through haze. And Blender still stops now and then with a GPU fault; running the same command again resumes it.

Where the camera never went

After the film, Opus 5.5 went back into the scene and rendered thirteen shots from places the flight skips, with the same colour grade and lens. Twelve of them are here.

The whole palace from high above one corner: both wings, the dome, four towers and the gardens, with the lake behind

Three waterfalls dropping off a long cliff into a still lake, seen from the water

The top of the great fall pouring between mossy rock, with the palace terrace and a tower just above

The front gate at eye level: black railings hung with gilded rings under a gold arch, the palace behind

The courtyard from above: a round fountain on a lawn, and a wide staircase up to the columned portico

The east wing and its tall tower, with the dome and snowy mountains behind

The dome up close: blue tiles, gold ribs and lit oval windows above a statue balcony

A fountain of arching jets and horse statues on the front drive, the palace behind

The hall from the doors: red marble columns either side of a crimson carpet running to the throne

The throne under a red canopy with a gold crest, between candelabra and arched mirrors

The carved chair up close, gilded frame and red tufted velvet — The chair, recoloured for the throne.

Looking up the hall: a coffered barrel vault between rows of red marble columns

Off the shelf

Every one of these came from an asset library, Poly Haven unless marked. Opus 5.5 rendered each one alone on a grey backdrop, 33 in all; these are twelve of them.