This release is a pre-release and may not be stable for production use.
Panda3D Pipes
"The internet is a series of pipes" — Some guy, probably.
NOT PRODUCTION READY. HEAVILY EXPERIMENTAL
A networked distributed-object framework for Panda3D built on top of Steam networking sockets. It provides authoritative server snapshots with delta compression, client-side interpolation, zone-based interest management, and a DC (distributed class) schema for defining replicated object fields — all driven by a tick-based simulation loop.
The original foundation of Panda3D pipes is based on the work of Brian Lach from the Panda3D player project.
Features
- Snapshot replication — The server captures the state of every distributed object each tick and sends delta-compressed snapshots to clients. Only changed fields are transmitted.
- Client-side interpolation — Templated C++
InterpolatedVariabletypes (float, Vec2/3/4, Quaternion) record value history and interpolate smoothly between received snapshots using linear or Hermite curves, with configurable extrapolation. - Zone-based interest — Clients subscribe to zones; the server only sends object data for zones a client cares about.
- DC schema — Shared
.dcfiles define the replicated fields, ownership rules (ownsend,clsend), and broadcast behaviour for each distributed class. - Distributed object lifecycle — Objects follow a well-defined lifecycle:
Fresh → Generated → Alive → Disabled → Deleted, with separate client, server (AI), and owner views. - Clock drift correction — A drift manager keeps the client simulation clock aligned to the server tick using sliding-window offset averaging and configurable correction thresholds.
- Ping / RTT tracking — Built-in ping protocol with a sliding-window average; per-client latency is available on both the server and client.
- Per-client rate control — Update rate, command rate, and interpolation amount are individually negotiable per client.
- C++ performance core — Snapshot packing, field unpacking (
CClientRepository), frame management, packed objects, and math utilities are implemented in C++ and exposed to Python via Panda3D's interrogate system. - Steam networking transport — Uses Valve's
SteamNetworkingSocketsfor reliable/unreliable messaging, NAT traversal, and optional Steam authentication.
Dependencies
- Panda3D 1.10.14+
- panda3d-steamworks — Python/C++ bindings for Steamworks networking
- panda3d-toolbox — Runtime helpers used by the framework
- Steam client running (required for Steam networking sockets)
- CMake 3.16+, a C++ compiler, and Python 3.10+
Building
pip install .
This invokes the CMake / interrogate pipeline via setuptools to compile the C++ extension module (panda3d_pipes).
Set SETUPTOOLS_SCM_PRETEND_VERSION to control the wheel version if building outside of CI.
Quick Start
See the examples/ directory for a minimal client/server demo. In two terminals from the repository root:
# Terminal 1 — start the server
python examples/server.py
# Terminal 2 — connect a client
python examples/client.py
The server listens on port 27015, spawns avatars for connecting clients, and relays chat messages. The client connects, sends a greeting, and periodically moves its avatar.
Configuration
Configuration is done through Panda3D PRC variables. Key defaults:
| Variable | Default | Description |
|---|---|---|
pipes-tickrate |
66 | Simulation tick rate (Hz) |
pipes-maxupdaterate |
255 | Max snapshot send rate per client |
pipes-minupdaterate |
1 | Min snapshot send rate per client |
pipes-max-clients |
24 | Maximum concurrent clients |
pipes-snapshot-history |
50 | Snapshots retained for delta compression |
pipes-password |
empty | Optional server password |
pipes-updaterate |
20 | Desired snapshot receive rate |
pipes-cmdrate |
100 | Command send rate |
pipes-interp |
0.1 | Interpolation buffer (seconds) |
pipes-interp-ratio |
2 | Ratio applied to update rate for interp |
pipes-ping-interval |
0.5 | Ping measurement interval (seconds) |
The effective interpolation delay is max(pipes-interp, pipes-interp-ratio / pipes-updaterate).
License
This project is licensed under the BSD 3-Clause License — see LICENSE for details.
The Steamworks SDK is Copyright © Valve Corporation and is subject to the rules outlined at Distributing Open Source.
1 maintainer
Release files for panda3d-pipes 0.0.1.dev10
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