blender-open-mcp

blender-open-mcp is an open source project that integrates Blender with local AI models (via Ollama) using the Model Context Protocol (MCP). This allows you to control Blender using natural language prompts, leveraging the power of AI to assist with 3D modeling tasks.

Features

• Control Blender with Natural Language: Send prompts to a locally running Ollama model to perform actions in Blender.
• MCP Integration: Uses the Model Context Protocol for structured communication between the AI model and Blender.
• Ollama Support: Designed to work with Ollama for easy local model management.
• Blender Add-on: Includes a Blender add-on to provide a user interface and handle communication with the server.
• PolyHaven Integration (Optional): Download and use assets (HDRIs, textures, models) from PolyHaven directly within Blender via AI prompts.
• Basic 3D Operations:
  • Get Scene and Object Info
  • Create Primitives
  • Modify and delete objects
  • Apply materials
• Render Support: Render images using the tool and retrieve information based on the output.

Installation

Prerequisites

1. Blender: Blender 3.0 or later. Download from blender.org.
2. Ollama: Install from ollama.com, following OS-specific instructions.
3. Python: Python 3.10 or later.
4. uv: Install using pip install uv.
5. Git: Required for cloning the repository.

Installation Steps

1. Clone the Repository:

   git clone https://github.com/dhakalnirajan/blender-open-mcp.git
   cd blender-open-mcp

2. Create and Activate a Virtual Environment (Recommended):

   uv venv
   source .venv/bin/activate  # On Linux/macOS
   .venv\Scripts\activate  # On Windows

3. Install Dependencies:

   uv pip install -e .

4. Install the Blender Add-on:

   • Open Blender.
   • Go to Edit -> Preferences -> Add-ons.
   • Click Install....
   • Select the addon.py file from the blender-open-mcp directory.
   • Enable the "Blender MCP" add-on.

5. Download an Ollama Model (if not already installed):

   ollama run llama3.2

   (Other models like Gemma3 can also be used.)

Setup

1. Start the Ollama Server: Ensure Ollama is running in the background.

2. Start the MCP Server:

   blender-mcp

   Or,

   python src/blender_open_mcp/server.py

   By default, it listens on http://0.0.0.0:8000, but you can modify settings:

   blender-mcp --host 127.0.0.1 --port 8001 --ollama-url http://localhost:11434 --ollama-model llama3.2

3. Start the Blender Add-on Server:

   • Open Blender and the 3D Viewport.
   • Press N to open the sidebar.
   • Find the "Blender MCP" panel.
   • Click "Start MCP Server".

Usage

Interact with blender-open-mcp using the mcp command-line tool:

Example Commands

• Basic Prompt:

  mcp prompt "Hello BlenderMCP!" --host http://localhost:8000

• Get Scene Information:

  mcp tool get_scene_info --host http://localhost:8000

• Create a Cube:

  mcp prompt "Create a cube named 'my_cube'." --host http://localhost:8000

• Render an Image:

  mcp prompt "Render the image." --host http://localhost:8000

• Using PolyHaven (if enabled):

  mcp prompt "Download a texture from PolyHaven." --host http://localhost:8000

Available Tools

Tool Name	Description	Parameters
get_scene_info	Retrieves scene details.	None
get_object_info	Retrieves information about an object.	object_name (str)
create_object	Creates a 3D object.	type, name, location, rotation, scale
modify_object	Modifies an object’s properties.	name, location, rotation, scale, visible
delete_object	Deletes an object.	name (str)
set_material	Assigns a material to an object.	object_name, material_name, color
render_image	Renders an image.	file_path (str)
execute_blender_code	Executes Python code in Blender.	code (str)
get_polyhaven_categories	Lists PolyHaven asset categories.	asset_type (str)
search_polyhaven_assets	Searches PolyHaven assets.	asset_type, categories
download_polyhaven_asset	Downloads a PolyHaven asset.	asset_id, asset_type, resolution, file_format
set_texture	Applies a downloaded texture.	object_name, texture_id
set_ollama_model	Sets the Ollama model.	model_name (str)
set_ollama_url	Sets the Ollama server URL.	url (str)
get_ollama_models	Lists available Ollama models.	None

Troubleshooting

If you encounter issues:

• Ensure Ollama and the blender-open-mcp server are running.
• Check Blender’s add-on settings.
• Verify command-line arguments.
• Refer to logs for error details.

For further assistance, visit the GitHub Issues page.

---

Happy Blending with AI! 🚀