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Falling rock trap

A cavern-corridor gate: two stone posts and a braced timber beam carry a slatted hopper of faceted boulders on an iron axle. A shin-height tripwire routes up the post through a pulley to a sliding release pin — trip it and the hopper dumps forward.

Original GLB281 KB Poster

Left rail: colours and the 4 knobs the agent wrote into this model — they rebuild the geometry and go into your download. Right rail: looks for the viewer. Drag to orbit, scroll to zoom.

Triangles: 3,520
Vertices: 4,207
Meshes · materials: 84 · 84
Size (W × H × D): 2.2 m × 2.2 m × 1.2 m
File: GLB · 281 KB
Animation: scene-motion · 5.6s
Style: Low-poly
Collection: Dragon's Hoard Cavern

Palette · named materials

rock#17161d
stone#7d828c
timber#3d2a1c
iron#1b1b22
gold#d0a225
trim#8f7019
hoard#debd63
accent#c32222

Use it

import { GLTFLoader } from "three/addons/loaders/GLTFLoader.js";

const gltf = await new GLTFLoader().loadAsync(
  "https://assets.stoicsoft.com/1designtool/3d/models/dragons-hoard-cavern-falling-rock-trap/b8e2a42451/model.glb"
);
scene.add(gltf.scene); // metres, +Y up, front faces +Z

const mixer = new THREE.AnimationMixer(gltf.scene);
gltf.animations.forEach((clip) => mixer.clipAction(clip).play());
// in your loop: mixer.update(delta)

How it was made

The brief given to 1DesignTool's “3D object” template:

Falling rock trap for the Dragon's Hoard Cavern kit. Design it as one clear asset at believable real-world scale for that setting (state the size in metres in meta.notes), with its main parts modelled and named, readable at thumbnail size and from every orbit angle. It moves: author a seamless baked loop (2–12 s) with every pivot exactly at its hinge, axle or swivel, and keep the base still. This is one part of the Dragon's Hoard Cavern kit (Low-poly style, flat-lowpoly direction): A vast cave piled with treasure. Use ONLY the kit palette, by name: gold #d0a225, ruby red #c32222, obsidian #17161d, cave blue #2e67b8, gold dark #8f7019, ruby red dark #821717, gold light #debd63, ruby red light #db5757, soot black #1b1b22, warm white #f2ede2, mid grey #7d828c, dark wood #3d2a1c. Every material's `name` must be exactly the palette colour it uses — the GLB carries these names so the kit recolours as one; an unnamed material fails delivery. Kit knob: expose a param `dragonColourAndSize` (0–1, default 0.5) for the kit's "Dragon colour and size" setting wherever it makes sense on this part, and keep that id.

Agent: Devin · SWE-2 Max in 1DesignTool
Direction: Low-poly · family abstract-kinetic
three-check PASS · glb-lint PASS

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Named parts · 27

Falling rock trap
Cavern base
Stone post L
Stone post R
Timber beam
Beam braces
Iron bindings
Cradle axle
Dragon keystone
Guide eyes
Pin hanger
Release pin
Guide pulley
Pulley wheel
Tripwire
Wire span A
Wire span B
Wire knot
Riser cord
Riser lower
Riser upper
Rock cradle
Hopper bin
Catch ear
Rock load
Lip rock A
Lip rock B

Note: 2.17 m tall x ~1.9 m wide gate, believable corridor-trap scale. Baked seamless 5.6 s loop: tripwire dips, the pin slides out of the catch ear, the hopper dumps forward about the axle rod, winches back level and re-locks; two lip rocks tumble at the rim and the pulley wheel spins with cord travel. Cradle pivots exactly on the axle, the pin slides along the hanger bores; posts, beam, axle, hanger and base never move. dragonColourAndSize picks the keystone colourway (cave blue / ruby red / gold) and scales it — the shipped GLB is the default 0.5 ruby variant. glb-lint caveats, all non-blocking: the exporter writes one material entry per mesh (palette names preserved on every entry), intentional embeds (posts into mounds and beam, coins into the slab, knots into cords), and the lowest vertex sits 4 mm under y=0 on a jittered sill edge — reads as seated.