Determining Your Three.js Version

To determine which version of Three.js you originally used in your 2020 project, you have a few options:

Check Your JavaScript Files

1. Look for version comments: Open your main Three.js file (likely three.js or three.min.js in your build folder) and check the top of the file. While you mentioned it doesn't include version information, sometimes there might be comments or metadata at the beginning of the file.

2. Check for specific API features: Different versions of Three.js have different API features. You could compare the methods and properties you're using against the documentation for different versions to narrow down which version you might be using.

Check Your Project Files

1. Package.json: If your project uses npm, check your package.json file for a Three.js dependency entry that might include version information.

2. Git history: If your project is under version control, you might find commit messages or tags related to the Three.js version you integrated.

Analyze the Build

You can try to analyze the build file itself by looking at specific features or function signatures that changed between versions. This is more technical but might help identify the version range.

Re-downloading the Correct Version

Once you have an idea of the version range, you can:

1. Visit the Three.js GitHub releases page
2. Download the appropriate version that matches your analysis
3. The examples folder is included in each release, so you'll be able to recover that content

If you're still unsure about the exact version, you might want to test your application with a few candidate versions to see which one works correctly with your existing code.