The terrain example is not working (perhaps due to outdated API call?):
matter.js:7486 Uncaught TypeError: path.getPathSegAtLength is not a function
at Object.Svg.pathToVertices (matter.js:7486)
at SVGPathElement. (terrain.js:43)
at Function.each (jquery-3.1.1.js:368)
at jQuery.fn.init.each (jquery-3.1.1.js:157)
at Object. (terrain.js:42)
at fire (jquery-3.1.1.js:3305)
at Object.fireWith [as resolveWith] (jquery-3.1.1.js:3435)
at done (jquery-3.1.1.js:9242)
at XMLHttpRequest. (jquery-3.1.1.js:9484)