just wondered if you could answer this for me. C2 has several .js files under exporters/html5/ that expose engine code like layout.js, glwrap.js and so on. I use a slightly modified version of these to get some functionality I need. Will we be able to modify those files in C3 as well?
12v Air Compressor
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No. The fact they were editable caused nightmare compatibility problems. So they are intentionally not exposed or available. The documented Addon SDK covers the features available to addon developers with a stable API that we (generally) promise not to break.