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Blender Open MCP Server

@dhakalnirajan

Repository

Basic information

Category

Other

License

NOASSERTION

Transports

stdio

Author

dhakalnirajan

About Blender Open MCP Server

Open Models MCP for Blender Using Ollama

#python#blender3d#blender#mcp#blender-addon#model-context-protocol#mcp-server

Blender Open MCP Server config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "blender-open-mcp": {
      "command": "uv",
      "args": [
        "venv"
      ]
    }
  }
}

Blender Open MCP Server tools

16

Full scene summary: objects, camera, render settings

Detailed object info: transforms, materials, mesh stats

Add a primitive mesh (CUBE, SPHERE, CYLINDER, ...)

Change location, rotation, scale, visibility

Remove an object from the scene

Create and assign a Principled BSDF material

Render current scene to a file

Run arbitrary Python/bpy code in Blender

List PolyHaven asset categories

Search PolyHaven library with pagination

Download & import a PolyHaven asset

Apply a downloaded PolyHaven texture to an object

Send a natural language prompt to Ollama

List available local Ollama models

Switch the active Ollama model

Update the Ollama server URL

Overview

What is blender-open-mcp?

Control Blender 3D with natural language prompts via local AI models. It connects MCP clients (Claude, Cursor, or any MCP client) to Blender through a local Ollama LLM. Built on the Model Context Protocol.

How to use blender-open-mcp?

Install prerequisites (Blender 3.0+, Python 3.10+, Ollama, uv). Clone the repo, create a venv with uv, install the package, install the Blender add-on (addon.py), pull an Ollama model (e.g. llama3.2), start Ollama, then run blender-mcp (with optional host/port/model flags). For stdio transport (Claude Desktop, Cursor) use --transport stdio. Use the bundled CLI (blender-mcp-client) or the Python API to interact.

Key features of blender-open-mcp

  • Natural language control of Blender via local AI (Ollama)
  • Supports multiple MCP transports (HTTP and stdio)
  • Full Blender scene inspection and object manipulation
  • Material assignment, rendering, and PolyHaven asset integration
  • Execute arbitrary Python/bpy code in Blender
  • Switch active Ollama model and server URL at runtime

Use cases of blender-open-mcp

  • Create and modify Blender scenes using plain English prompts
  • Automate repetitive tasks (adding objects, applying materials, rendering)
  • Integrate AI-assisted code generation into Blender pipelines
  • Browse and import PolyHaven textures and materials
  • Control Blender remotely from any MCP-compatible client

Frequently asked questions

1

What are the prerequisites for blender-open-mcp?

Blender 3.0+, Python 3.10+, the latest Ollama, and uv. An internet connection is needed to pull Ollama models and PolyHaven assets.

2

How do I connect Claude Desktop or Cursor to blender-open-mcp?

Add the server configuration to your `mcp.json` (or `~/.cursor/mcp.json`) with the command `"blender-mcp"` and args `["--transport", "stdio"]`.

3

Why can't the server connect to the Blender add-on?

Open Blender, go to the 3D Viewport N‑sidebar, find the Blender MCP panel, and click "Start MCP Server". The add‑on listens on port 9876 by default.

4

What ports does blender-open-mcp use?

FastMCP server: port 8000 (configurable). Blender add‑on TCP socket: port 9876. Ollama: port 11434.

5

Can I use a different Ollama model?

Yes. Pull any model with `ollama pull <model>` and specify it at server start with `--ollama-model <model>`, or switch it later via the `blender_set_ollama_model` tool.

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