Function insertNode

Apps/BabylonScripts/meshwriter.min.js:5962–5976

(i, x, y, last)

        // create a node and optionally link it with previous one (in a circular doubly linked list)
        function insertNode(i, x, y, last) {
            var p = new Node(i, x, y);

            if (!last) {
                p.prev = p;
                p.next = p;

            } else {
                p.next = last.next;
                p.prev = last;
                last.next.prev = p;
                last.next = p;
            }
            return p;
        }

        function removeNode(p) {
            p.next.prev = p.prev;