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threenative-blender-mcp

v0.1.2

Published

Drives an installed Blender headlessly so a downloaded .fbx becomes a GLB a ThreeNative game loads. Ships no Blender.

Vulnerabilities

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Links

Git

Maintainers

jonit-devjonit-dev

Keywords

threenativemcpmodel-context-protocolblenderfbxgltfagents

Readme

threenative-blender-mcp

An MCP server that drives an already installed Blender headlessly, so a .fbx, .blend, .obj or .dae an agent downloaded becomes a GLB a ThreeNative game can load.

It contains no Blender, downloads no Blender, and links against nothing from Blender. Installing it costs zero Blender bytes.

Tools

| Tool | What it answers | | --- | --- | | blender_status | Can this machine convert models at all? Never fails — with no Blender it returns available: false and the install command for each platform. |

Finding Blender

In order, first match wins:

  1. THREENATIVE_BLENDER_PATH — an explicit path. Set but unresolvable is its own reported cause, never a silent fallback to a different Blender.
  2. PATH.
  3. The platform's conventional install locations (/usr/bin, /snap/bin, a macOS Blender.app, C:\Program Files\Blender Foundation\…).

A Blender older than 4.2 reports available: false with cause: "blender-too-old" rather than being driven with scripts written against a newer bpy.

Blender is never installed for the user. npm postinstall has no TTY and cannot ask, and 350 MB is not an install cost this framework imposes without consent — so the server reports what is missing and the agent asks in conversation. THREENATIVE_TOOLCHAIN_AUTOINSTALL=0 suppresses even the offer.

Licensing

Blender is GPLv2-or-later. This package holds the boundary in two places:

  • The binary is resolved, never bundled, linked, imported or vendored. ThreeNative spawns blender --background; it is a separate process.
  • The Node server is MIT. Every Python file that runs inside Blender against bpy lives under gpl/, carries an SPDX-License-Identifier: GPL-2.0-or-later header, and sits beside gpl/LICENSE.GPL. __tests__/licensing.spec.ts fails on a gpl/*.py without that header and on a .py that appears anywhere else in this package.

What this is not

ThreeNative drives Blender as a separate process. It never reimplements modelling, sculpting, shading, rigging or rendering, ships no geometry-authoring UI, and adds no bpy feature. When Blender is absent the framework says so and does less; it never substitutes.