Hermes
dd2a1734eb
- Shelf tool to open/close command port in Houdini - hhb client script (eval, script, get-selected, set-param, etc.) - Hermes skill with standard hou module workflows - Example: create pyro setup - hou module quick reference
83 lines
3.2 KiB
Markdown
83 lines
3.2 KiB
Markdown
# Hermes-Houdini Bridge
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> Hermes Agent ↔ Houdini Python Bridge — remote node control, parameter editing, VEX injection, and scene querying via Houdini's built-in `hcommand` protocol.
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## Architecture
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```
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Hermes Agent (orange-desktop) Houdini 21.0 (fedora.fritz.box)
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┌─────────────────────┐ ┌──────────────────────────────┐
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│ hhb eval "code" │──SSH──────────→│ hcommand PORT "python code" │
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│ hhb script file.py │ │ ↓ │
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│ hhb get-selected │ │ hou module (running session) │
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└─────────────────────┘ └──────────────────────────────┘
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```
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No custom server needed — uses Houdini's built-in `openport` + `hcommand` protocol. The bridge wraps SSH and command quoting so Hermes can send Python code to your live Houdini session.
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## Quick Start
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### 1. Install the Shelf Tool (once)
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Copy `houdini/shelf/hermes_bridge.shelf` to your Houdini toolbar, or run the shelf script directly in Houdini's Python Shell.
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### 2. Open the Bridge (every session)
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Click the **Hermes Bridge** shelf button in Houdini. It opens port 12345 and shows a status dialog.
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### 3. Use from Hermes
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```bash
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# Get selected node info
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./hermes/bin/hhb get-selected
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# Set a parameter
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./hermes/bin/hhb eval "hou.selectedNodes()[0].parm('file').set('/path/to/file.abc')"
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# Query connections
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./hermes/bin/hhb eval "print(hou.selectedNodes()[0].inputConnections())"
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# Execute a complex Python script
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./hermes/bin/hhb script ./examples/create_pyro_setup.py
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```
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## Requirements
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- Houdini 20+ (tested with 21.0)
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- SSH access from Hermes host to Houdini workstation
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- Network connectivity (port 12345, default)
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## Project Structure
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```
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hermes-houdini-bridge/
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├── houdini/
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│ └── shelf/
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│ └── hermes_bridge.shelf # Shelf tool: open/close port
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├── hermes/
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│ ├── bin/
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│ │ └── hhb # Client: send commands to Houdini
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│ └── skill/
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│ └── SKILL.md # Hermes skill for standard workflows
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├── examples/
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│ └── create_pyro_setup.py # Example: build a pyro sim
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├── docs/
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│ └── REFERENCE.md # hou module cheat sheet
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└── README.md
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```
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## Security
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- Port 12345 opens on `0.0.0.0` — only use on trusted networks
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- To restrict to localhost: modify the shelf tool's `openport` call to `hou.hscript('openport 12345 +.+.+.+')`
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- The bridge uses Hermes' existing SSH key — no additional credentials needed
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## Troubleshooting
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| Symptom | Fix |
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| `hcommand: connect failed` | Port not open. Click shelf button in Houdini. |
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| `hcommand: connection refused` | Houdini not running or port blocked by firewall. |
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| Python error in output | Code has syntax issues. Test in Houdini Python Shell first. |
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| `ModuleNotFoundError: No module named 'hou'` | Running hython directly, not through hcommand. Use `hhb`. |
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