# ellmos Blender Use [Health: Active]

**Category:** 💻 Developer Tools  
**Repository:** https://github.com/ellmos-ai/ellmos-blender-use-mcp  
**GitHub Stars:** 2  
**Views:** 0  
**Installs:** 0  
**Upvotes:** 0  
**Directory Page:** https://allmcps.com/mcp/ellmos-blender-use

## Description
Headless Blender asset QA over MCP: background script runs and FBX reimport verification.

## Claude Desktop Quick Installation
Install path detected from listing signals. Uses `npx` (confidence: high):

```json
"mcpServers": {
  "ellmos-blender-use": {
    "command": "npx",
    "args": ["-y","/"]
  }
}
```

## Documentation & README

<p align="center">
  <img src="https://raw.githubusercontent.com/ellmos-ai/ellmos-blender-use-mcp/main/assets/logo.jpg" alt="ellmos Blender Use MCP logo" width="340">
</p>

# ellmos Blender Use MCP

**🇩🇪 [Deutsche Version](https://github.com/ellmos-ai/ellmos-blender-use-mcp/blob/HEAD/README_de.md)**

*Part of the [ellmos-ai](https://github.com/ellmos-ai) family.*

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📦 **[View on npm →](https://www.npmjs.com/package/ellmos-blender-use-mcp)** | 🛡️ **[Security Policy](https://github.com/ellmos-ai/ellmos-blender-use-mcp/blob/HEAD/SECURITY.md)** | 🤖 **[LLM Context](https://github.com/ellmos-ai/ellmos-blender-use-mcp/blob/HEAD/llms.txt)** | 🌐 **[Ecosystem](#ellmos-ai-ecosystem)**

An asset-QA tool for game and 3D asset pipelines: verify that an exported FBX actually reimports cleanly in headless Blender — mesh count, material count, and required naming prefixes checked automatically, with a deterministic JSON result instead of a manual eyeball pass. `blender_verify_fbx_reimport` is the core structural tool and `blender_verify_visual` its visual counterpart — the first counts meshes and checks name prefixes, the second renders four views and measures geometry that counting cannot see. `blender_locate` and `blender_run_script` are the general-purpose primitives both are built on.

**No add-on. No TCP port. No background daemon.** This server does not install anything into Blender, does not open a socket for a running Blender instance to connect to, and does not keep Blender resident. Each call spawns `blender --background --python <script.py>`, waits for a bounded, timeout-guarded exit, and returns the result — headless and stateless by design. It does not download assets and does not collect telemetry.

**How this differs from other Blender MCP servers.** Most Blender MCP projects (e.g. `ahujasid/blender-mcp`, the official Blender Labs MCP server) drive a *live, running* Blender GUI over a TCP/add-on bridge for interactive scene editing — a different use case with a different trust model (an open socket, an installed add-on, a persistent process). This server instead targets **CI-style, one-shot asset verification**: run it in a pipeline step, get a pass/fail JSON, move on. If you need live GUI control, use a reviewed Blender MCP add-on separately (see Safety below).

> [!NOTE]
> **AI / LLM Integration & Machine-Readable Context**: AI assistants (Claude, Codex, Gemini) can read [llms.txt](https://github.com/ellmos-ai/ellmos-blender-use-mcp/blob/HEAD/llms.txt) for machine-readable context, search phrases, and tool documentation. Regression test suites guard privacy hygiene and runtime memory safety.

> [!TIP]
> **CI & Asset Pipeline Automation**: Use `blender_verify_fbx_reimport` as an automated gate before committing 3D assets to source control. It flags missing prefixes (e.g., `SM_`, `M_`), unexpected mesh counts, or broken material assignments without human intervention.

## Architecture & Workflow

### 1. Component Topology

```mermaid
graph TD
    subgraph Client ["AI Assistant & Client Environment"]
        AI["AI Agent (Claude / Codex / Gemini)"]
        Config["MCP Configuration (npx / node)"]
    end

    subgraph Server ["ellmos Blender Use MCP Server"]
        MCP["MCP Protocol Server (src/index.js)"]
        subgraph Tools ["Tool Handlers"]
            T1["blender_verify_fbx_reimport"]
            T2["blender_run_script"]
            T3["blender_locate"]
            T4["blender_verify_visual"]
        end
        Safety["Timeout & Tail Buffer Guard (8k chars)"]
    end

    subgraph Subprocess ["Headless Subprocess (Isolated)"]
        Exe["Blender Executable (blender --background)"]
        Python["Temp Python Verification Script"]
        FBX["Target FBX Asset File"]
        JSONOut["Deterministic JSON Result"]
    end

    AI -->|JSON-RPC Request| MCP
    MCP --> Tools
    T1 -->|Generates script & spawns| Exe
    T2 -->|Executes arbitrary python| Exe
    T3 -->|Locates binary| Exe
    T4 -->|Generates visual verification script & spawns| Exe
    Exe --> Python
    Python --> FBX
    FBX -->|Mesh / Material / Naming QA| JSONOut
    JSONOut --> Safety
    Safety -->|Bounded Response| AI

    style Client fill:#1e1e2e,stroke:#89b4fa,stroke-width:1px
    style Server fill:#181825,stroke:#cba6f7,stroke-width:1px
    style Subprocess fill:#11111b,stroke:#a6e3a1,stroke-width:1px
```

### 2. Headless Asset-QA Verification Lifecycle

```mermaid
sequenceDiagram
    autonumber
    actor Client as AI Assistant / CI Pipeline
    participant Server as ellmos Blender Use MCP
    participant Resolver as Blender Resolver
    participant Process as Headless Subprocess
    participant Python as Blender Python Engine
    participant FS as Local Filesystem (FBX)

    Client->>Server: Call blender_verify_fbx_reimport(fbxPath, requiredPrefixes)
    Server->>Resolver: Resolve Blender Executable (blender_locate / BLENDER_EXE / Registry / PATH)
    Resolver-->>Server: Return Validated Executable Path
    Server->>FS: Write Temp Python Verification Script
    Server->>Process: Spawn blender --background --python <script> (timeout-guarded)
    Process->>Python: Execute Verification Script
    Python->>FS: bpy.ops.import_scene.fbx(filepath=fbxPath)
    FS-->>Python: Parse Mesh Objects & Material Slots
    Python->>Python: Validate Naming Prefixes, Object Counts & Hierarchy
    Python->>FS: Write Output JSON Verification Result
    Process-->>Server: Process Exit (Exit Code 0 / Bounded Tail Buffer)
    Server->>FS: Read Result & Clean Up Temp Verification Script
    Server-->>Client: Deterministic JSON Result (meshCount, materialCount, missingPrefixes, ok)
```

## Tools

| Tool | Purpose |
|---|---|
| `blender_verify_fbx_reimport` | Generate a temporary Blender verification script, import an FBX, and write a JSON result with mesh/material counts and missing required prefixes. |
| `blender_run_script` | Run `blender --background --python <script.py>` with optional arguments and bounded stdout tail. |
| `blender_locate` | Resolve the Blender executable from an explicit path, `BLENDER_EXE`, the standard Windows install locations, or PATH. |
| `blender_verify_visual` | Render four views of an FBX and check geometry a structural reimport cannot see: unapplied rotation, floating parts, pivot outside the model, transform residuals, stray empties. |

### `blender_verify_visual`

Renders four views of an FBX and checks geometry that a **structural** reimport cannot see.

`blender_verify_fbx_reimport` counts meshes and checks name prefixes — it cannot tell you that
a mesh is lying on its side, that a part floats away from the assembly, or that the pivot sits
outside the model. This tool does, and it produces the renders to look at.

```json
{ "fbxPath": "kit.fbx", "outDir": "verify_visual", "expectHeight": "2.5,3.5" }
```

Detected failure classes: unapplied rotation, floating parts in multi-part assets, pivot/origin
outside the bounding box, transform residuals in the export, stray empties.

Returns `verification` (the parsed `verify_visual_result.json` with `ok`, `fails`, `warns`,
`metrics`) plus `renders` — `view_front.png`, `view_side.png`, `view_top.png`,
`view_perspective.png`.

**Why four views and not one:** a single front shot hides depth errors — floating-vs-resting,
behind-vs-in-front. A real case: chain links looked correctly attached from the front and were
not attached at all when seen from the side.

Like every tool here it is a one-shot headless run: no add-on, no daemon, no socket.

## Safety

- This server runs local Python inside Blender. Use only scripts and asset paths you trust.
- The default timeout is bounded.
- No remote asset marketplaces, API keys, or telemetry are included.
- For live GUI control, use a reviewed Blender MCP add-on separately.

## Installation

### Option 1: Run via npx (no install)

```json
{
  "mcpServers": {
    "blender-use": {
      "command": "npx",
      "args": ["-y", "ellmos-blender-use-mcp"]
    }
  }
}
```

### Option 2: Install from source

```bash
git clone https://github.com/ellmos-ai/ellmos-blender-use-mcp.git
cd ellmos-blender-use-mcp
npm install
npm run build
node src/index.js
```

For a local checkout, point `command`/`args` at the cloned `src/index.js` instead:

```json
{
  "mcpServers": {
    "blender-use": {
      "command": "node",
      "args": ["<path-to-repo>/src/index.js"]
    }
  }
}
```

## Configuration

- `BLENDER_EXE` — optional path to the Blender executable. Without it, tools try the explicit `blenderPath` argument, then `BLENDER_EXE`, then the standard Blender install locations on Windows (`%ProgramFiles%\Blender Foundation\Blender <version>\blender.exe` and the equivalent 32-bit and per-user roots, newest version first), then `PATH`. On Linux and macOS the lookup goes straight from `BLENDER_EXE` to `PATH`.
- Every tool also accepts an explicit `blenderPath` argument per call, which takes priority over `BLENDER_EXE`.
- Process output is retained only as a tail: `blender_run_script` defaults to 8,000 characters (configurable up to 50,000); FBX verification keeps 8,000. The response marks `outputTruncated: true` when earlier output was discarded, so verbose Blender scripts cannot grow the MCP process memory without bound.

## License

MIT — see [LICENSE](https://github.com/ellmos-ai/ellmos-blender-use-mcp/blob/HEAD/LICENSE).

---

## ellmos-ai Ecosystem

This MCP server is part of the **[ellmos-ai](https://github.com/ellmos-ai)** ecosystem — AI infrastructure, MCP servers, and intelligent tools.

### MCP Server Family

| Server | Tools | Focus | npm |
|--------|-------|-------|-----|
| [FileCommander](https://github.com/ellmos-ai/ellmos-filecommander-mcp) | 46 | Filesystem, process management, interactive sessions, cloud-lock-safe operations | [`ellmos-filecommander-mcp`](https://www.npmjs.com/package/ellmos-filecommander-mcp) |
| [CodeCommander](https://github.com/ellmos-ai/ellmos-codecommander-mcp) | 22 | Code analysis, JSON repair, imports, diffs, regex | [`ellmos-codecommander-mcp`](https://www.npmjs.com/package/ellmos-codecommander-mcp) |
| [Clatcher](https://github.com/ellmos-ai/ellmos-clatcher-mcp) | 12 | File repair, format conversion, batch operations | [`ellmos-clatcher-mcp`](https://www.npmjs.com/package/ellmos-clatcher-mcp) |
| [n8n Manager](https://github.com/ellmos-ai/n8n-manager-mcp) | 18 | n8n workflow management via AI assistants | [`n8n-manager-mcp`](https://www.npmjs.com/package/n8n-manager-mcp) |
| [ControlCenter](https://github.com/ellmos-ai/ellmos-controlcenter-mcp) | 20 | MCP stack discovery, profile management, control plane | [`ellmos-controlcenter-mcp`](https://www.npmjs.com/package/ellmos-controlcenter-mcp) |
| [Homebase](https://github.com/ellmos-ai/ellmos-homebase-mcp) | 45 | Local-first LLM memory, knowledge, state, routing, swarm orchestration | [`ellmos-homebase-mcp`](https://www.npmjs.com/package/ellmos-homebase-mcp) (alpha) |
| [ServerCommander](https://github.com/ellmos-ai/ellmos-servercommander-mcp) | 8 | Server operations: health checks, log analysis, deploy dry-runs, mail diagnostics | [`ellmos-servercommander-mcp`](https://www.npmjs.com/package/ellmos-servercommander-mcp) (alpha) |
| **[Blender Use](https://github.com/ellmos-ai/ellmos-blender-use-mcp)** | **4** | **Headless Blender asset QA: structural FBX reimport checks and four-view visual verification** | **[`ellmos-blender-use-mcp`](https://www.npmjs.com/package/ellmos-blender-use-mcp)** (alpha) |
| [Open Compute](https://github.com/ellmos-ai/open-compute-mcp) | 10 | Model-agnostic computer use: capture, safety-gated actions, Windows UIA | [`open-compute-mcp`](https://www.npmjs.com/package/open-compute-mcp) (alpha) |

### AI Infrastructure & Developer Tools

| Project | Description |
|---------|-------------|
| [workflowhooker](https://github.com/ellmos-ai/workflowhooker) | Transparent command interceptor & safety sandbox for agentic workflows |
| [system-explorer](https://github.com/ellmos-ai/system-explorer) | System inspection, MCP orchestration, and fleet introspection runtime |
| [memoryhooker](https://github.com/ellmos-ai/memoryhooker) | High-performance episodic memory interceptor for AI agents |
| [policy-registry](https://github.com/ellmos-ai/policy-registry) | Policy distribution and compliance engine for multi-agent frameworks |
| [ellmos-delegation-authority](https://github.com/ellmos-ai/ellmos-delegation-authority) | Trust boundary verification & cryptographic token delegation authority |
| [sqlite-transit-sync](https://github.com/ellmos-ai/sqlite-transit-sync) | Transactional SQLite transit replication with snapshot isolation |
| [BACH](https://github.com/ellmos-ai/bach) | Local-first text-based OS for LLM agents — 113+ handlers, 550+ tools, SQLite memory |
| [open-compute](https://github.com/ellmos-ai/open-compute) | Model-agnostic computer-use core powering Open Compute MCP |
| [clutch](https://github.com/ellmos-ai/clutch) | Provider-neutral LLM orchestration with auto-routing and budget tracking |
| [rinnsal](https://github.com/ellmos-ai/rinnsal) | Lightweight agent memory, connectors, and automation infrastructure |
| [ellmos-stack](https://github.com/ellmos-ai/ellmos-stack) | Self-hosted AI research stack (Ollama + n8n + Rinnsal + KnowledgeDigest) |
| [MarbleRun](https://github.com/ellmos-ai/MarbleRun) | Autonomous agent chain framework for Claude Code |
| [gardener](https://github.com/ellmos-ai/gardener) | Minimalist database-driven LLM OS prototype (4 functions, 1 table) |
| [ellmos-tests](https://github.com/ellmos-ai/ellmos-tests) | Testing framework for LLM operating systems (7 dimensions) |

### Desktop Software Suite & Sibling Tools

Our partner organization **[open-bricks](https://github.com/open-bricks)** bundles AI-native desktop applications and developer utilities — a modern, open-source software suite built for the age of AI:

| Project | Ecosystem | Description |
|---------|-----------|-------------|
| [ProFiler](https://github.com/file-bricks/ProFiler) | `file-bricks` | Advanced file management, deep inspection, and batch pipeline workbench |
| [DokuZen](https://github.com/doc-bricks/DokuZen) | `doc-bricks` | Unified document converter, markdown formatter, and documentation hub |
| [PDFtoPDFocr](https://github.com/doc-bricks/PDFtoPDFocr) | `doc-bricks` | High-fidelity OCR processor and searchable PDF pipeline |
| [MediaBrain](https://github.com/file-bricks/MediaBrain) | `file-bricks` | AI-assisted media categorization, tagging, and asset management |
| [TextBrain](https://github.com/doc-bricks/TextBrain) | `doc-bricks` | Text analysis, summarization, and local language intelligence suite |
| [knowledgedigest](https://github.com/open-bricks/knowledgedigest) | `open-bricks` | Knowledge extraction, semantic clustering, and synthesis engine |
| [DevCenter](https://github.com/dev-bricks/DevCenter) | `dev-bricks` | Developer environment orchestration and multi-agent management cockpit |
| [CodeBox](https://github.com/dev-bricks/CodeBox) | `dev-bricks` | Secure execution sandbox and isolated code-runner runtime |