3d-asset-marketplace-research

3D Asset Marketplace Research

Use this skill when the user asks to find, compare, or source downloadable 3D models from marketplaces/repositories such as Sketchfab, MyMiniFactory, CGTrader, TurboSquid, Free3D, Cults3D, Printables, Thingiverse, Thangs, Etsy, or museum/heritage repositories.

The deliverable should be a grounded acquisition shortlist: free vs paid, license/use restrictions, download formats, mesh complexity, source URLs, and a fit ranking for the user's intended workflow.

Workflow

1. Clarify the asset class through search terms, not questions unless necessary. - Search all likely synonyms and disambiguations: subject names, historical names, alternate spellings, and adjacent object types (head, bust, statue, herm, scan, STL, OBJ, glTF). - Include negative filters mentally and in queries for common false positives (e.g. Mercury can mean the singer, planet, Sailor Mercury, car brand, or element).

2. Search multiple marketplace classes in parallel. - Free/community: Sketchfab downloadable, MyMiniFactory/Scan the World, Printables, Thingiverse, Thangs. - Commercial: CGTrader, TurboSquid, Free3D, Cults3D, 3DExport, Etsy, Fab. - Heritage/museum mirrors: Scan the World, institutional pages, Sketchfab museum accounts.

3. Verify structured metadata wherever possible. - Sketchfab: use the public API for reliable isDownloadable, license, faceCount, vertexCount, viewerUrl, tags, and description: python import requests uid = "MODEL_UID" data = requests.get(f"https://api.sketchfab.com/v3/models/{uid}", timeout=20).json() - For Sketchfab downloads, public metadata can prove downloadability and license, but exact archive URLs/formats usually require authenticated download. State this clearly; do not invent exact formats. - MyMiniFactory pages often expose the license and Object Parts in clean page text. Use those lines to verify STL filenames. - CGTrader pages often expose price, license label, file formats, poly/vertex counts, printable status, verification checks, and no-AI/custom restrictions. - TurboSquid/Free3D/Cults/Etsy can be anti-bot or extraction-hostile; if blocked, use official search snippets as leads but label details as lower confidence and recommend checkout verification.

4. Separate free from paid and license-fit from visual-fit. - Free is not automatically usable: CC BY-NC, CC BY-NC-SA, and especially CC BY-NC-ND can block commercial use, redistribution, conversions, or derivative GLB exports. - Paid marketplace “royalty free” is not uniform. Check for custom/personal-only terms, no-AI terms, and commercial add-ons. - If the user needs a web viewer, prefer permissive licenses and native/common runtime formats (glTF/GLB, OBJ, FBX) over print-only STL unless conversion is acceptable.

5. Rank for the actual target workflow. - For Three.js wireframe rendering, prioritize:

   • clear silhouette from many angles
   • visible/clean topology or quad-like retopology
   • moderate polycount that will not overload the browser
   • formats that convert cleanly to GLB
   • strong subject identity/iconography
   • Very high-poly museum scans can look good but may need decimation; note this as a workflow cost.
   • STL print models often have dense triangulated sculpt topology; good for dramatic detail, less ideal for clean wireframe unless retopologized or decimated.

6. Use thumbnail/preview vision to assess aesthetics. - Pull marketplace preview images and inspect silhouette, facial/head detail, iconic attributes, base/pedestal distractions, and whether wireframe lines will read as intentional structure or noisy scan triangles. - Do not rank by render beauty alone; rank by the target render style.

7. Write a persistent report when the search is non-trivial. - Save findings to a local markdown file if many candidates were compared. - Include confidence levels for blocked pages or snippet-derived details.

Output template

• Best recommendation: [asset + why]
• Free candidates
• Name / URL
• Marketplace / author
• License and restrictions
• Verified formats or format caveat
• Poly/vertex count when known
• Fit ranking and notes
• Paid candidates
• Price
• License label and restrictions
• Formats
• Poly/vertex count / verification status
• Fit ranking and notes
• Excluded / false positives: [brief list]
• Caveats: [blocked pages, checkout verification, authenticated download requirements]

Pitfalls

• Do not treat search snippets as fully verified when the marketplace page is blocked; label them as snippet-derived.
• Do not claim Sketchfab exact download formats from metadata alone; use authenticated download or state that the format requires login/download check.
• Do not ignore no-derivatives licenses when the workflow involves converting, decimating, or redistributing a GLB.
• Do not conflate visual quality with wireframe quality: high-poly sculpts and scans can become noisy wireframes.
• Watch out for same-name false positives: celebrities, brands, planets, anime/game characters, and unrelated products.

References

• references/hermes-mercury-head-bust-marketplace-search.md — worked example: sourcing Hermes/Mercury deity head/bust assets, using Sketchfab API, MyMiniFactory object-part/license extraction, marketplace caveats, and wireframe ranking.