{"slug": "show-hn-a-3d-mesh-playground-for-coding-agents-three-js-manifold-3d", "title": "Show HN: A 3D mesh playground for coding agents (three.js + manifold-3d)", "summary": "A developer released a browser-based 3D mesh playground built on three.js and manifold-3d that lets coding agents connect over MCP or run in-browser to build and edit geometry without a local Blender install. The playground gives agents a render_preview tool that captures multi-view screenshots — front, right, top, iso, custom camera angles and clay mode — so the agent can inspect its output and correct the mesh. The linked trace shows Gemini reconstructing a Copenhagen canal scene from a photo, hitting a script error on the first pass, fixing the bug, then iterating through several rounds of 4-view and close-up render_preview checks to adjust the geometry.", "body_md": "When GPT-6/Gemini launched recently, a lot of the 3D demos used blender-mcp ([https://github.com/ahujasid/blender-mcp](https://github.com/ahujasid/blender-mcp)). It's cool, but you have to install blender locally and wire up plugins just to try a prompt or share a run.\n\nI built a browser-based 3D mesh playground so you can hook up your own coding agent over MCP (or run in-browser) directly in a tab. It runs on three.js + manifold-3d for blender-like boolean/mesh editing in JS, and gives the agent a render_preview tool to take multi-view screenshots (front/right/top/iso + custom camera angles + clay mode). That way the agent can look at what it built and fix the geometry, similar to how it iterates when building a website.\n\nThe submitted link is a trace of Gemini reconstructing a Copenhagen canal scene from a photo: it hits a script error on the first pass, fixes the bug, and then goes through several rounds of checking 4-view and close-up render_preview screenshots to tweak the geometry.\n\nComments URL: [https://news.ycombinator.com/item?id=50237291](https://news.ycombinator.com/item?id=50237291)\n\nPoints: 1\n\n# Comments: 0", "url": "https://wpnews.pro/news/show-hn-a-3d-mesh-playground-for-coding-agents-three-js-manifold-3d", "canonical_source": "https://sketchagent.dev/s/yfYU6LhT", "published_at": "2026-10-26 00:02:39+00:00", "updated_at": "2026-10-26 00:43:27.324919+00:00", "lang": "en", "topics": ["ai-agents", "agent-protocols", "ai-tools", "generative-ai"], "entities": ["three.js", "manifold-3d", "Gemini", "blender-mcp", "Blender", "MCP"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/show-hn-a-3d-mesh-playground-for-coding-agents-three-js-manifold-3d", "markdown": "https://wpnews.pro/news/show-hn-a-3d-mesh-playground-for-coding-agents-three-js-manifold-3d.md", "text": "https://wpnews.pro/news/show-hn-a-3d-mesh-playground-for-coding-agents-three-js-manifold-3d.txt", "jsonld": "https://wpnews.pro/news/show-hn-a-3d-mesh-playground-for-coding-agents-three-js-manifold-3d.jsonld"}}