THREEAR
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Determine any unused code
It is very plausible some of the code in these files will be entirely unused and can probably be deleted. The code was ported from ar.js and it was hard to determine what was relevant and what was not.
Using the Chrome coverage tool might be useful here: https://www.vojtechruzicka.com/measuring-javascript-and-css-coverage-with-google-chrome-developer-tools/