Web3d Server

MCP server for 3D scene generation for web and ads, built on React Three Fiber (R3F).

web3d-mcp-server turns a plain-English prompt into a structured scene plan, validated scene_data, geometry synthesis contracts, framework-ready .jsx or .tsx React Three Fiber code, exportable assets, and integration guidance.

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Hosted Server

The fastest way to get started — no installation required.

MCP endpoint:

https://web3d-mcp.onrender.com/mcp

Jump to Using the Hosted Server for setup instructions.

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Quick Navigation

Start Here	Reference	Extra Docs
Using the Hosted Server	Recommended Pipeline	Quick Example
What It Does	Tools	Tool Information
Who It Helps	Local Installation	Folder Structure
Technologies	Operational Notes	Sample Prompts
Architecture	Examples	License

What It Does

• Converts natural-language scene requests into a structured 3D workflow.
• Produces scene_data with camera, lighting, objects, materials, background, animations, and design tokens.
• Supports preview, validation, targeted editing, animation stacking, optimization, geometry synthesis, code generation, export, and integration help.
• Generates React Three Fiber scene components for plain React, Vite, and Next.js.
• Helps AI assistants follow a predictable, tool-based pipeline instead of generating raw 3D code from scratch.

Who It Helps

• Frontend engineers building hero sections, landing pages, and product showcases.
• Design engineers prototyping interactive web visuals and ad concepts.
• AI application builders who want an MCP-based 3D scene workflow.
• Agencies and product teams that need faster concept-to-code iteration for 3D scenes.

Technologies

Core Stack

Area	Technologies
Language	TypeScript
MCP runtime	FastMCP
Validation	Zod
Runtime	Node.js
Environment config	dotenv
Testing	Jest
Development workflow	nodemon, TypeScript compiler

Output Ecosystem

The server generates assets and guidance for:

• React Three Fiber
• Three.js
• @react-three/drei
• Next.js
• Vite
• plain React

Architecture

This server is hybrid and supports two runtime modes.

Local Mode: stdio

• Best for Claude Desktop, Cursor, and other local MCP clients.
• Runs as a child process on the developer machine.
• Ideal for local development and personal workflows.

Remote Mode: HTTP Stream

• Best for shared teams, browser clients, and hosted setups.
• Exposes the MCP endpoint at /mcp.
• The public hosted endpoint is https://web3d-mcp.onrender.com/mcp.

Recommended Pipeline

Notes:

• edit_scene can be used any time after generate_scene and before generate_r3f_code.
• optimize_for_web is optional but useful for mobile or performance-sensitive targets.
• generate_r3f_code can return SYNTHESIS_REQUIRED, SUCCESS, PARTIAL_SUCCESS, or ERROR.
• PARTIAL_SUCCESS means one or more objects fell back to a red wireframe placeholder.

Tools

The server currently registers 12 tools.

#	Tool	Primary role
1	refine_prompt	Structure free-form creative intent
2	generate_scene_plan	Convert prompt into a scene plan
3	generate_scene	Build full scene_data
4	preview	Visualize layout and spatial quality
5	validate_scene	Run structural validation
6	edit_scene	Make targeted scene revisions
7	apply_animation	Add or merge animations
8	optimize_for_web	Reduce performance cost
9	synthesize_geometry	Create geometry contracts
10	generate_r3f_code	Produce final React Three Fiber code
11	export_asset	Package outputs as files
12	integration_help	Explain app integration steps

Detailed tool reference: tool_information.md

Examples

Worked example: quick_example.md

Prompt examples for users: sample_prompt.md

Folder Structure

Repository structure reference: folder_structure.md

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Using the Hosted Server

The server is publicly hosted and ready to use — no installation or local setup required. All 12 tools are available.

Hosted MCP URL:

https://web3d-mcp.onrender.com/mcp

Connect via Claude Desktop

Step 1 — Open the Claude Desktop config file.

On macOS:

~/Library/Application Support/Claude/claude_desktop_config.json

On Windows:

%APPDATA%\Claude\claude_desktop_config.json

If the file does not exist, create it.

Step 2 — Add the remote server entry.

{
  "mcpServers": {
    "web3d": {
      "url": "https://web3d-mcp.onrender.com/mcp"
    }
  }
}

If you already have other MCP servers configured, add the web3d entry alongside them inside the mcpServers object.

Step 3 — Restart Claude Desktop.

Fully quit and relaunch the app. Claude Desktop connects to the remote server at startup.

Step 4 — Verify the connection.

Open a new conversation and try a prompt like:

Generate a 3D scene of a glowing orb floating above a reflective surface.

If Claude begins using tools like generate_scene_plan or generate_scene, the connection is working.

Connect via Cursor or Other MCP Clients

Any MCP client that supports remote HTTP stream transport can connect using the same URL:

{
  "mcpServers": {
    "web3d": {
      "url": "https://web3d-mcp.onrender.com/mcp"
    }
  }
}

Refer to your client's documentation for the exact config file location and format.

Notes

• The server is hosted on Render and may take 30–60 seconds to respond on the first request after a period of inactivity. Subsequent requests in the same session will be fast.
• No authentication is required.

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Local Installation

Only needed if you want to run the server locally for development or self-hosting. For most use cases, the hosted server is the simpler option.

Prerequisites

• Node.js 18+
• npm

Commands

Install dependencies:

npm install

Build the server:

npm run build

Start the local stdio server:

npm run start

Run development mode with file watching:

npm run dev

Run development mode over HTTP stream:

npm run dev:http

Run the project health checks:

npm run health

Claude Desktop — Local Config

Point Claude Desktop at the built dist/server.js file.

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "web3d": {
      "command": "node",
      "args": [
        "/Users/alex/dev/web3d-mcp-server/dist/server.js"
      ]
    }
  }
}

Cursor and Other stdio Clients

Use the same command and args pattern:

{
  "mcpServers": {
    "web3d": {
      "command": "node",
      "args": [
        "/Users/alex/dev/web3d-mcp-server/dist/server.js"
      ]
    }
  }
}

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Framework Support

Framework	framework param	Notes
Plain React	"plain"	No directive added
Vite	"vite"	No directive added
Next.js App Router	"nextjs"	Adds "use client"
Next.js Pages Router	"nextjs"	Pair with integration_help and dynamic(..., { ssr: false })

TypeScript Support

typing param	Output
"none"	Plain .jsx
"typescript"	.tsx with Group | Mesh ref types
"prop-types"	.jsx with a PropTypes block

Operational Notes

Geometry Cache

• Synthesized JSX can be cached locally under .synthesis_cache/geometry_cache.json.
• The cache is created on demand.
• Repeated object and style combinations can reuse earlier geometry.

Status Values

Status	Meaning
SUCCESS	Scene code generated with no placeholder fallbacks
PARTIAL_SUCCESS	Scene code generated, but one or more objects fell back to placeholders
SYNTHESIS_REQUIRED	More geometry synthesis work is required before final code generation
ERROR	Generation failed and did not produce a usable component

Author

Dev Agrawal

License

See LICENSE.