arena-py

Draw objects and run programs in the ARENA using Python!

Documentation

The ARENA Python library user guide and tutorials: ARENA Documentation: Python.

Setup

Install package using pip (https://pypi.org/project/arena-py/):

pip3 install arena-py

Hello ARENA Example Program

Run the hello.py example:

cd examples
python hello.py

hello.py

from arena import *

scene = Scene(host="arenaxr.org", scene="example")

@scene.run_once
def make_box():
    scene.add_object(Box())

scene.run_tasks()

arena-py Library

The above is the simplest example of an ARENA Python program. This library sits above the ARENA pub/sub MQTT message protocol: JSON messages described in more detail at https://github.com/arenaxr/ARENA-core which runs in a browser. That forms a layer, in turn, on top of A-Frame and THREE.js javascript libraries.

Alternate Server Usage

In addition to the above, you may deploy your own ARENA webserver if you do not wish to use our test deployment server at arenaxr.org. You can follow our setup guidelines in arenaxr/arena-services-docker, to run your own server.

Authentication

We have added protection to the ARENA MQTT broker to limit access to change your scenes, which requires Python programs to supply authentication through a Google account.

Sign-In Desktop OS

If you have a web browser available, the arena-py library Scene(host="myhost.com") will launch a web browser the first time and ask you for an account to authenticate you with, before opening a client MQTT connection.

Sign-In Server/Headless OS

For headless environments, the arena-py library Scene(host="myhost.com") will provide you with a url to cut and paste in a browser anywhere, ask you for an account to authenticate you with, and show you a code you can enter on the command line, before opening a client MQTT connection.

Scripts

Some helper script aliases have been added in this library to help you manage authentication and quick command-line (CLI) publish and subscribe to the ARENA.

Sign-Out

arena-py-signout

Show Permissions

arena-py-permissions

CLI Subscribe to Scene Messages

arena-py-sub -mh arenaxr.org -s example

CLI Subscribe to Custom Topic

arena-py-sub -mh arenaxr.org -t realm/g/a

CLI Publish a Scene Object Message

arena-py-pub -mh arenaxr.org -s example -m '{"object_id": "gltf-model_Earth", "action": "create", "type": "object", "data": {"object_type": "gltf-model", "position": {"x":0, "y": 0.1, "z": 0}, "url": "store/models/Earth.glb", "scale": {"x": 5, "y": 5, "z": 5}}}'

CLI Help

arena-py-pub --help
arena-py-sub --help

Changelog

Changelog can be found here.

arena-py Repository Files

• arena/: The ARENA Python library.

• examples/: Canonical examples of ARENA functions from the documentation.

• examples/objects: Examples on how to create various arena-py objects.

• examples/attributes: Examples on how to declare an add various arena-py object attributes.

• examples/legacy/: Deprecated demos for arena-py < 0.1.0.

• examples/legacy/digital-twins/: Deprecated demo of digital twins of physical spaces for arena-py < 0.1.0.

• system-tests/: Workouts and tests for arena-py.

• tools/: Reusable tools for any ARENA scene.