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All effects Dioramas & voxel scenes Voxel Castle Under Siege Voxel Castle Under Siege Voxel Castle Under Siege is a published Three.js prompt by @vib3coded. It has source credit and no verified 3dmotion rebuild.
by @vib3coded on X · 2026-10-25
Author preview · no on-site rebuild Original prompt @vib3coded · X Rebuild status No verified 3dmotion rebuild. Open demo No live demo linked here. Prompt by @vib3coded. Copies include source credit.
Original prompt Free · 3,644 characters Build a single-file HTML voxel toy called "Siege of Greymoor" with three.js r160 (ES modules via import map from jsDelivr). Use OrbitControls, EffectComposer, UnrealBloomPass and OutputPass. World - A dense voxel grid of 176×64×148 cells…
Build a single-file HTML voxel toy called "Siege of Greymoor" with three.js r160 (ES modules via import map from jsDelivr). Use OrbitControls, EffectComposer, UnrealBloomPass and OutputPass.
World
- A dense voxel grid of 176×64×148 cells (Uint8 material ids plus a "part" id per cell).
- Mesh it in 16³ chunks: emit only faces toward air, with per-vertex ambient occlusion and vertex colors. Remesh only dirty chunks, under a per-frame budget.
- Add an emissive vertex attribute so glass windows and torches glow at night.
- Lay out an original medieval castle on a mound, ringed by a water moat:
- curtain walls with a wall-walk, parapet and merlons;
- four round corner towers on footings; two get red shingle cones and waving cloth banners;
- a gatehouse with drum towers, a portcullis grid and a raised drawbridge;
- a tall keep with glowing windows and four slate-roofed turrets;
- a timber-framed great hall with a thatched roof, a stable, a smithy and a well.
- Outside the castle: a siege camp with striped tents, a pavilion, a palisade, a camp fire and a pile of shot. Add pine and leafy trees and boulders, all on a floating terrain slab.
Physics
- Debris: an InstancedMesh of tumbling cubes. Move each axis separately against the grid. Debris sinks slowly in the moat and settles back into the grid as rubble.
- Structural support: a span-limited 0-1 BFS from grounded columns. Stepping up costs 0; sideways or down costs 1.
- Each material has a maximum span (stone 5, timber 9, iron 12, leaves 14, and so on). Blocks beyond their span detach.
- Small detached sets become debris. Large sets become a rigid falling piece that tips away from the lost support and shatters on impact.
- At startup, run a dry pass and prune any blocks that would be unsupported.
- Fire: timber, thatch, cloth and leaves catch. Fire spreads upward faster than sideways or down. Burnt blocks turn to charcoal or fall in, then trigger a support check.
- Visuals for fire: an additive glow box per burning block, orange flame and ember point sprites, dark smoke, and a few flickering point lights.
Siege
- A box-built trebuchet with a counterweight and a sling that turns to face the target.
- Shot cycle: swing, release on a ballistic arc (gravity 26), follow-through, wind back.
- Three shots:
- stone, crater radius 3.4;
- fire pot, ignites what it hits;
- boulder, crater radius 5.2.
- Craters are ragged and stretched along the line of flight. Hits throw dust and moat spray.
- Archers patrol the wall-walks and fall when the stone under them goes. Banners drop when their pole's base is destroyed.
- The masons rebuild the castle layer by layer from a saved copy, 16 layers per second.
Lighting and UI
- Three hours, each with its own sun direction, hemisphere light, sky gradient, fog, emissive glow, bloom and exposure:
- Sext (noon);
- Vespers (dusk);
- Compline (night).
- Darken unlit particles at night.
- Vellum-and-ink medieval interface using the fonts Alegreya, Alegreya Sans SC and JetBrains Mono:
- italic title "The siege of Greymoor" top left, which turns light at dusk and night;
- a "chronicle" log top right that writes plain sentences such as "A 300-lb boulder strikes the south-east tower and breaks it open.", "The banner on the walls comes down." and "Fire takes hold on the great hall.", plus a "Send the masons" button;
- a bottom dock with these groups: shot type, Loose / Keep loosing, hour, view (Slow time, Circle the walls), and a tally of standing %, shots, fallen and burning.
- Click to aim, drag to orbit. Keyboard: space fires, keys 1–3 pick the shot.
- Responsive down to phone width. Prompt by @vib3coded , posted on X on 2026-10-25. x.com/vib3coded/status/2114295834611212692 . Copies include this credit. Original prompt, credited
collection · petergpt Open, then Run
Original prompt, credited
collection · petergpt Open, then Run
Original prompt, credited
collection · petergpt Open, then Run
A Verified card includes a receipt and a pinned single-file rebuild you can run here. Recorded limitations explain what the rebuild changes or leaves out.
