Simple scene created with THREEJS to explore a gallery scene model with mesh reflector material setup. this will be easier to understand now that all the things that are not important were removed ;)
Download and install Node.js on your computer (https://nodejs.org/en/download/).
Then, open VSCODE, drag the project folder to it. Open VSCODE terminal and install dependencies (you need to do this only in the first time)
npm install
Run this command in your terminal to open a local server at localhost:8080
npm run dev