Build a Stylized Gramophone with GPT-6 Astra and V2Fun

Overview

This case reconstructs a stylized gramophone on an ornate wooden cabinet, with black records arranged beside the player. Its defining feature is the division of modeling work: V2Fun supplies the curved brass horn, while Three.js procedural modeling supplies the cabinet, player case, turntable, and repeated record forms.

The technical brief frames GPT-6 Astra as the agent responsible for structural planning and assembly. The supplied reference, exploded component study, and final presentation illustrate that hybrid approach. For broader context, see the GPT-6 Astra and V2Fun collaboration workflow.

Tools Used

• GPT-6 Astra: structural planning, component organization, and assembly coordination, as described in the case brief.
• V2Fun: generated horn reference imagery and the brass horn 3D component identified in the supplied studies.
• Three.js: procedural cabinet, gramophone case, turntable, mechanism work, and record collection, as labeled in the component study.
• Visual references: the complete composition, AI-inferred horn views, and an isolated horn reference.
• GLB: the supplied final asset format.

Step 1 — Establish the Composition and Horn References

The original reference shows a dark wooden cabinet facing the viewer, a smaller gramophone case above it, a flared golden horn, and records to the right. This establishes the main silhouette and the relationship between furniture and instrument.

The reference sheet also includes front, side, and rear horn studies alongside a larger isolated horn image. These additional views are explicitly labeled as AI-inferred. They provide modeling guidance, while hidden surfaces remain interpretations rather than measured evidence. The single-image and multi-view input guide provides related reference-preparation context.

Step 2 — Separate the Assembly into Components

The exploded study identifies six component groups:

• Walnut cabinet with paneled doors, drawers, and brass-colored fittings.
• Gramophone case with corner pillars and layered moldings.
• Turntable with a disc, platter, and spindle.
• Tonearm and mount, described as a reused mechanism with a fitted lower horn mount.
• Antique brass horn, marked as the V2Fun-generated 3D component.
• Record collection with repeated discs and sleeves.

This breakdown makes the modeling split visible: the cabinet and repeated objects follow regular forms, while the horn concentrates the broad curves and scalloped silhouette.

Step 3 — Combine Generated and Procedural Forms

V2Fun handles the horn's flared mouth, raised ribs, and curved lower neck. The component study describes this asset as an AI mesh with PBR textures; its rendered appearance shows a mottled gold surface and darker interior. No texture resolution is supplied for this case.

The wooden structures and records are presented as procedural components. Their repeated drawers, rectangular panels, circular discs, and layered trim complement the generated horn. The V2Fun AI 3D model generator describes the related image-to-3D capability.

Step 4 — Assemble and Present the Model

In the final image, the player rests on the cabinet, the horn rises above the turntable, and upright records occupy the right side. A winding crank projects from the player case. The cabinet remains predominantly front-facing, making its paired doors and flanking drawer stacks easy to read.

The final presentation identifies the image as a render of the delivered GLB after reloading. It also states that hidden surfaces and small ornaments are approximations. This documents a visual assembly result without establishing the model's internal mesh properties.

Workflow

Composition reference → Component breakdown → AI-inferred horn references → V2Fun horn generation and Three.js procedural components → Assembly → GLB export and presented reload render.

Prompt

English translation of the original design brief:

“Use a gray gradient background. Show a gramophone placed on a wooden cabinet table, with several vinyl records beside it, leaning against the gramophone. Keep the overall style cartoon-like, with the front of the cabinet facing the camera.”

Result

The final presentation retains the wooden cabinet, brass horn, black records, and stylized appearance requested in the brief. The records sit upright beside the player, and the presentation uses a pale cream background rather than the requested gray gradient.

Supplied output metadata: victrola-hybrid.glb, 53,843,596 bytes, approximately 53.84 MB, with MIME type model/gltf-binary. For related format guidance, see the AI 3D export guide.

The case demonstrates a selective division between generated geometry and procedural construction. No case-specific timing or token measurements were supplied, so efficiency gains remain an intended benefit rather than a measured result.