Expose makeEdgesFromFaces now that this doesn't happen automatically

Author: davepagurek

src/webgl/p5.Geometry.js

@@ -1345,6 +1345,51 @@ class Geometry {
     return this;
   }
 
+  /**
+   * @example
+   * <div>
+   * <code>
+   * let tetrahedron;
+   * function setup() {
+   *   createCanvas(200, 200, WEBGL);
+   *   describe('A rotating tetrahedron');
+   *
+   *   tetrahedron = new p5.Geometry();
+   *
+   *   // Give each geometry a unique gid
+   *   tetrahedron.gid = 'tetrahedron';
+   *
+   *   // Add four points of the tetrahedron
+   *
+   *   let radius = 50;
+   *   // A 2D triangle:
+   *   tetrahedron.vertices.push(createVector(radius, 0, 0));
+   *   tetrahedron.vertices.push(createVector(radius, 0, 0).rotate(TWO_PI / 3));
+   *   tetrahedron.vertices.push(createVector(radius, 0, 0).rotate(TWO_PI * 2 / 3));
+   *   // Add a tip in the z axis:
+   *   tetrahedron.vertices.push(createVector(0, 0, radius));
+   *
+   *   // Create the four faces by connecting the sets of three points
+   *   tetrahedron.faces.push([0, 1, 2]);
+   *   tetrahedron.faces.push([0, 1, 3]);
+   *   tetrahedron.faces.push([0, 2, 3]);
+   *   tetrahedron.faces.push([1, 2, 3]);
+   *   tetrahedron.makeEdgesFromFaces();
+   * }
+   * function draw() {
+   *   background(200);
+   *   strokeWeight(2);
+   *   orbitControl();
+   *   rotateY(millis() * 0.001);
+   *   model(tetrahedron);
+   * }
+   * </code>
+   * </div>
+   */
+  makeEdgesFromFaces() {
+    this._makeTriangleEdges();
+  }
+
   /**
    * Converts each line segment into the vertices and vertex attributes needed
    * to turn the line into a polygon on screen. This will include: