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Cầu Thị Nại, Bình Định

A gently humped concrete bridge crosses a blue-green lagoon on twin-column piers, with fishing boats and peninsula hills. Two cars cross the deck while the boats bob in a baked ten-second loop.

Original GLB7.7 MB Poster

Left rail: colours and the 3 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: 314,146
Vertices: 209,617
Meshes · materials: 130 · 11
Size (W × H × D): 1.9 m × 18 cm × 92 cm
File: GLB · 7.7 MB
Animation: scene-motion · 10.0s
Style: Product
Collection: Landmarks

Palette · named materials

concrete#c6c8bb
asphalt#626b70
metal#bcc6c6
water#205e64
slate#495965
sand#a19a79
foliage#50664a
teal#2d636b
red#a44e3e
ivory#f1e4c9
dark#263b45

Use it

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

const gltf = await new GLTFLoader().loadAsync(
  "https://assets.stoicsoft.com/1designtool/3d/models/cau-thi-nai/737c5bbb78/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:

The Thị Nại Bridge (2006), a 2.48 km sea-crossing bridge linking Quy Nhơn to the Phương Mai peninsula over Thị Nại lagoon. Model a characteristic stretch: the prestressed concrete box-girder deck (14.5 m wide, with guardrails and slender lamp posts) carried on twin-column piers, rising to a gently humped, taller navigation span in the middle; approach spans continuing to both ends of the diorama; calm blue-green lagoon water with fishing boats under the spans; hills of the peninsula behind. Loop (10 s): a couple of small cars drive across and the boats bob. Make it a polished, elegant model in the stylised-PBR direction: clean proportions, smooth curvature, soft bevels on every edge, crisp silhouettes and a restrained palette of named materials (name each material for what it is, e.g. "limestone", "red lacquer", "glazed roof tile", "sea water"); every material in the exported GLB must carry that name — set `material.name` on each one, because an unnamed material fails review. It must be recognisable at a glance as the real place. No text, lettering, logos or signage anywhere. There are no reference photos for this one: follow the description closely. Natural sites and large complexes are presented as a tabletop diorama on a clean rounded plinth with slate-grey sides; state the real-world scale and the diorama scale in meta.notes. Hard requirement: the exported GLB must contain AT LEAST 150,000 triangles (target 200,000–350,000) — measure it before delivering. Spend the budget on real modelled detail (roof tiles, carvings, railings, mouldings, rock strata, foliage clusters, water surface, boats), never on invisible subdivision. Keep the GLB under 25 MB: index all geometry, instance repeated parts, no image textures.

Agent: Codex · GPT-6.1-Sol in 1DesignTool
Generation: 6.61M tokens (97% cached) · weekly plan +0.41%
Direction: Product · family scenes
three-check PASS · glb-lint PASS

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Named parts · 78

Thị Nại lagoon diorama
Rounded slate plinth
Slate sides
lip
Sculpted blue-green lagoon
Prestressed box-girder deck
Beveled box girder
Continuous crowned asphalt surface
Continuous concrete curb
Continuous concrete curb
Modelled lane markings
Twin-column piers
Twenty-four softly edged concrete columns
Hammerhead pier caps
Lagoon pier footings
Elastomeric girder bearings
Guardrails and fittings
Continuous rounded steel rail
Continuous rounded steel rail
Continuous rounded steel rail
Continuous rounded steel rail
Continuous rounded steel rail
Continuous rounded steel rail
Beveled fitted railing posts
Slope-fitted foot plates
Instanced guardrail anchor nuts
Slender street lamps
Curved lamp stems
Rounded lamp housings
Lamp mounting collars
Phương Mai peninsula
Smooth rolling coastal hills
Closed sandstone peninsula cut faces
Closed peninsula underside
80 individually sculpted shoreline outcrops
Low coastal scrub clusters
Teal fishing boat
Rounded painted wooden hull
deck
Thick cream gunwale
+38 more

Note: Units are metres, +Y is up and the foreground faces +Z. The bottom-centred 1.86 × 0.92 m tabletop plinth rests at y=0; height is approximately 0.183 m. The real 2006 bridge is 2.48 km long and 14.5 m wide. This interpretive diorama models a representative 440 m stretch at 1:250; the deck width is 0.058 m. It is not a survey reconstruction or a model of the entire bridge. The navigation hump and peninsula relief are stylised. Cars scale down at the cropped approaches to conceal loop resets; boat motion uses rigid transforms, and water relief is static. The three parameters rebuild the authored scene; the GLB contains the default geometry and baked motion, not procedural controls. Repeated rail fittings export using core glTF mesh reuse, with no required extensions or image textures. Eleven named materials are shared. Lint reports five nonblocking style/spatial warnings; the dense triangle budget and palette are declared direction overrides, and assembly overlaps were visually reviewed.