# 3d Object > three.js model, downloadable as OBJ or GLB - Skill: `gabrielmoreira/3d-object` (Agent Skill) - Install (CLI): `npx skillmds@latest add gabrielmoreira/3d-object` - Raw SKILL.md: https://api.skillmd.com/api/skills/gabrielmoreira/3d-object/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: AI & ML - Author: gabrielmoreira (https://skillmd.com/u/gabrielmoreira) - Updated: 2026-09-09 - Page: https://skillmd.com/skills/gabrielmoreira/3d-object --- # 3D object Model a 3D object the user can inspect from every angle and download, built with three.js and presented in the three_d_stage starter. START by calling copy_starter_component with kind: "three_d_stage.js" — it is the whole viewer: studio lighting, ground shadow, orbit controls, an auto-framed camera, and a toolbar that downloads the object as OBJ + MTL or GLB. Read the copied file's usage block and follow its page skeleton exactly. You only write the model-building module script. Build the page as plain HTML — a .html file with ordinary Build the model programmatically, as a THREE.Group composed of named parts: - Compose primitives (BoxGeometry, CylinderGeometry, SphereGeometry, TorusGeometry, LatheGeometry, ExtrudeGeometry with Shape) before reaching for raw BufferGeometry; real objects decompose into far more primitives than you'd guess. - NAME every mesh and every material ("hull", "walnut", "brass") — the names become the o / usemtl entries in the exported OBJ and the node names in the GLB, which is what makes the download usable in Blender. - Use MeshStandardMaterial with a small curated palette (3-5 materials, shared across parts); set roughness/metalness deliberately. Textures don't survive the OBJ export — prefer geometry and material color over texture detail. - Model in real-world meters, y-up, centered on the origin, base resting at the lowest y. Offset deliberately coplanar faces by ~0.001 so nothing z-fights. - Curved surfaces need enough segments to read as smooth at full screen (32+ radial segments on feature surfaces), but don't tessellate what no one will see. The stage's toolbar gives the user OBJ + MTL (universal, geometry + per-material colors) and GLB (the modern interchange format — keeps the part hierarchy and PBR materials; imports cleanly into Blender, Maya, Cinema 4D, Unity, Unreal). Those two are the export formats on offer — when the user asks for something else (FBX, USDZ, STEP), say plainly that the stage exports OBJ + MTL and GLB. Iterate with screenshots: the stage keeps its last frame readable, so the ordinary screenshot tools capture the live canvas — no extra steps. After editing a module file, reload with show_html before screenshotting (the iframe caches already-loaded modules). Look at the object from the default framing and refine silhouette, proportion, and material separation — the silhouette carries the object.