Hermes
105 lines
3.6 KiB
Markdown
105 lines
3.6 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. Clone & Install (once)
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```bash
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cd ~/houdini21.0
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git clone https://git.niklashmotion.art/Hermes/hermes-houdini-bridge.git hermes_houdini_bridge
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cd hermes_houdini_bridge
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bash install.sh
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```
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`install.sh` generates a Houdini package descriptor in `~/houdini21.0/packages/`. The plugin lives directly inside the Houdini prefs directory — no CGI project pollution.
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### 2. Open the Panel (every session)
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Restart Houdini, then: **Windows → Hermes Bridge**
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The panel lets you:
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- Choose a port number
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- Open/Close the bridge with one click
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- Copy a ready-to-use prompt: *"Hey Hermes, I have a Houdini session running on [hostname] (port 12345)"*
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### 3. Update
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```bash
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cd hermes-houdini-bridge && git pull
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```
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### 4. Uninstall
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```bash
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rm ~/houdini21.0/packages/hermes_houdini_bridge.json
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```
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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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