Make sure to install python3 and then pip install flask / flask_cors packages.

Then use a terminal to navigate to the app's folder and just run this project with: python3 -m app

Optionally use VS Code app for editing and running.

I have not tried it but another way of running this project could be within a virtual environment:

• pip install virtualenv
• python3 -m venv env
• pip install flask
• pip install flask_cors

Use preview links, from the 'Usage' section of the main page, to see and test most of the pages online. Most of the features of Three.js viewers are also functional online.