---
title: Open vs Closed Geometry
---

<p>
    An open geometry is when any path in a drawing is a dead end. A closed geometry is when all path ends meet and there are no dead end paths. A closed geometry forms an enclosed shape.
</p>

<p>
    Examples of Open Geometry:
</p>

<script>
    (function () {
        //open geometries

        var makerjs = require('makerjs');
        function asterisk() {

            function plus() {
                this.paths = {
                    h: new makerjs.paths.Line([-5, 0], [5, 0]),
                    v: new makerjs.paths.Line([0, -5], [0, 5])
                }
            }

            this.models = {
                plus: new plus(),
                plus1: makerjs.model.rotate(new plus(), 45)
            };
        }

        var model = {
            models: {
                a: new asterisk(),
                b: new makerjs.models.ConnectTheDots(false, [[10, -5], [20, -5], [20, 5], [10, 5], [10, 0]])
            }
        };

        var svg = makerjs.exporter.toSVG(model);

        document.write(svg);

    })();
</script>

<p>
    Examples of Closed Geometry:
</p>

<script>
    (function () {
        //closed geometries

        var makerjs = require('makerjs');

        var model = {
            models: {

                nut: {
                    models: {
                        polygon: new makerjs.models.Polygon(6, 20)
                    },
                    paths: {
                        inner: new makerjs.paths.Circle(10)
                    }
                },

                plate: makerjs.model.moveRelative({
                    models: {
                        outer: makerjs.model.center(new makerjs.models.Rectangle(60, 30)),
                        inner: makerjs.model.center(new makerjs.models.Oval(45, 15)),
                        bolts: makerjs.model.center(new makerjs.models.BoltRectangle(50, 20, 2)),
                    },
                }, [60, 0]),

                triangle: makerjs.model.moveRelative(
                  new makerjs.models.ConnectTheDots(true, [[-20, -17], [20, -17], [0, 17]])
                , [120, 0])

            }
        };

        var svg = makerjs.exporter.toSVG(model);

        document.write(svg);

    })();
</script>

<p>
    Maker.js works with both open and closed geometries. When your desire is to create a three dimensional object, you will probably be using a closed geometry.
</p>