THREE JS https://gist.github.com/bellbind/477817982584ac8473ef/ https://github.com/tbuser/thingiview.js?utm https://github.com/mrdoob/three.js/blob/master/examples/js/loaders/STLLoader.js OPENJSCAD https://openjscad.org/ https://en.wikibooks.org/wiki/OpenJSCAD_User_Guide#Cube