Initial commit: Hermes-Houdini Bridge
- 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
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Hermes
Executable
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#!/usr/bin/env bash
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# ──────────────────────────────────────────────────────────
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# hhb — Hermes-Houdini Bridge Client
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# Sends Python/hou commands to a running Houdini session
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# via SSH + hcommand.
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# ──────────────────────────────────────────────────────────
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set -euo pipefail
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HOST="${HHB_HOST:-niklas@192.168.178.39}"
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PORT="${HHB_PORT:-12345}"
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HCOMMAND="${HHB_HCOMMAND:-/opt/hfs21.0/bin/hcommand}"
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WORKSPACE="${HHB_WORKSPACE:-/opt/data/projects/hermes-houdini-bridge}"
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usage() {
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cat <<'EOF'
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Usage: hhb <command> [args]
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Commands:
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eval <python_code> Execute Python code in the running Houdini session.
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Example: hhb eval "print(hou.selectedNodes())"
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script <file.py> Send a Python script file to Houdini and execute it.
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Example: hhb script ./examples/create_pyro_setup.py
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get-selected Print paths and types of selected nodes.
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get-param <parm> Get value of a parameter on the first selected node.
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set-param <parm> <val> Set a parameter on the first selected node.
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get-inputs Print input connections of the first selected node.
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status Check if the bridge port is open.
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help Show this help.
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EOF
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exit 0
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}
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# ── Helpers ──────────────────────────────────────────────
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run_remote_python() {
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# Write Python code to a temp file, execute via hcommand.
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# This avoids quoting hell with complex Python snippets.
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local python_code="$1"
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local tmpfile="/tmp/hhb_$$.py"
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# Upload script
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printf '%s' "$python_code" | ssh "$HOST" "cat > $tmpfile"
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# Execute via hscript's python command — reads file and execs
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local output
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output=$(ssh "$HOST" \
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"$HCOMMAND $PORT \"python exec(open('$tmpfile').read())\"" 2>&1) || {
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local rc=$?
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ssh "$HOST" "rm -f $tmpfile" 2>/dev/null
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echo "hhb: hcommand failed (exit $rc)" >&2
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echo "$output" >&2
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return $rc
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}
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# Cleanup
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ssh "$HOST" "rm -f $tmpfile" 2>/dev/null
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# hcommand output has a prefix line like "-> foobar", strip it
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echo "$output" | sed 's/^->\s*//'
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}
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# ── Commands ──────────────────────────────────────────────
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cmd_status() {
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local output
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output=$(ssh "$HOST" "$HCOMMAND $PORT openport" 2>&1) || {
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echo "Bridge INACTIVE — Houdini not reachable or port $PORT closed."
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return 1
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}
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echo "$output" | sed 's/^->\s*//'
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}
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cmd_eval() {
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[[ $# -ge 1 ]] || { echo "Usage: hhb eval <python_code>"; exit 1; }
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run_remote_python "$*"
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}
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cmd_script() {
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[[ $# -ge 1 ]] || { echo "Usage: hhb script <file.py>"; exit 1; }
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local script_path="$1"
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[[ -f "$script_path" ]] || { echo "File not found: $script_path"; exit 1; }
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scp -q "$script_path" "$HOST:/tmp/hhb_script_$$.py"
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local output
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output=$(ssh "$HOST" \
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"$HCOMMAND $PORT \"python exec(open('/tmp/hhb_script_$$.py').read())\"" 2>&1) || {
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local rc=$?
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ssh "$HOST" "rm -f /tmp/hhb_script_$$.py" 2>/dev/null
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echo "hhb: hcommand failed (exit $rc)" >&2
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echo "$output" >&2
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return $rc
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}
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ssh "$HOST" "rm -f /tmp/hhb_script_$$.py" 2>/dev/null
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echo "$output" | sed 's/^->\s*//'
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}
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cmd_get_selected() {
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run_remote_python '
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import hou
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nodes = hou.selectedNodes()
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if not nodes:
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print("No nodes selected.")
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else:
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for n in nodes:
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print(f"{n.path():50s} [{n.type().name()}]")
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'
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}
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cmd_get_param() {
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[[ $# -ge 1 ]] || { echo "Usage: hhb get-param <parm_name>"; exit 1; }
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local parm="$1"
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run_remote_python "
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import hou
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nodes = hou.selectedNodes()
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if not nodes:
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print('No nodes selected.')
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else:
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p = nodes[0].parm('$parm')
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if p is None:
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print(f'Parameter \"$parm\" not found on {nodes[0].path()}')
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else:
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print(f'{nodes[0].path()}.{p.name()} = {p.eval()}')
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"
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}
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cmd_set_param() {
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[[ $# -ge 2 ]] || { echo "Usage: hhb set-param <parm_name> <value>"; exit 1; }
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local parm="$1"
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local val="$2"
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run_remote_python "
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import hou
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nodes = hou.selectedNodes()
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if not nodes:
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print('No nodes selected.')
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else:
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p = nodes[0].parm('$parm')
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if p is None:
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print(f'Parameter \"$parm\" not found on {nodes[0].path()}')
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else:
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p.set('$val')
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print(f'{nodes[0].path()}.{p.name()} = {p.eval()} ✓')
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"
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}
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cmd_get_inputs() {
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run_remote_python '
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import hou
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nodes = hou.selectedNodes()
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if not nodes:
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print("No nodes selected.")
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else:
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for n in nodes:
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inputs = n.inputConnectors()
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print(f"\n{n.path()} [{n.type().name()}]")
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for i, conn in enumerate(inputs):
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in_nodes = n.inputConnections(i) if hasattr(n, "inputConnections") else []
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if in_nodes:
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for c in in_nodes:
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print(f" input {i} ← {c.inputNode().path()} [{c.inputNode().type().name()}]")
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else:
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print(f" input {i} ← (none)")
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'
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}
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# ── Main ─────────────────────────────────────────────────
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[[ $# -ge 1 ]] || usage
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CMD="$1"
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shift || true
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case "$CMD" in
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eval) cmd_eval "$@" ;;
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script) cmd_script "$@" ;;
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get-selected) cmd_get_selected ;;
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get-param) cmd_get_param "$@" ;;
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set-param) cmd_set_param "$@" ;;
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get-inputs) cmd_get_inputs ;;
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status) cmd_status ;;
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help|--help|-h) usage ;;
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*)
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echo "Unknown command: $CMD"
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usage
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;;
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esac
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