added minimum area check to Bodies.fromVertices

src/factory/Bodies.js

@@ -166,6 +166,7 @@ var Bodies = {};
  * If the vertices are not convex, they will be decomposed if [poly-decomp.js](https:/schteppe/poly-decomp.js) is available.
  * If the vertices can not be decomposed, the function will use the convex hull.
  * By default the decomposition will discard collinear edges (to improve performance).
+ * It will also discard any particularly small parts that have an area less than `minimumArea` (to improve stability).
  * The options parameter is an object that specifies any properties you wish to override the defaults.
  * See the properties section of the `Matter.Body` module for detailed information on what you can pass via the `options` object.
  * @method fromVertices
@@ -174,9 +175,10 @@ var Bodies = {};
  * @param [vector] vertices
  * @param {object} [options]
  * @param {bool} [removeCollinear=true]
+ * @param {number} [minimumArea=100]
  * @return {body}
  */
- Bodies.fromVertices = function(x, y, vertices, options, removeCollinear) {
+ Bodies.fromVertices = function(x, y, vertices, options, removeCollinear, minimumArea) {
  var canDecompose = true,
  body,
  i,
@@ -186,6 +188,7 @@ var Bodies = {};
 
  options = options || {};
  removeCollinear = typeof removeCollinear !== 'undefined' ? removeCollinear : true;
+ minimumArea = typeof minimumArea !== 'undefined' ? minimumArea : 100;
 
  if (Vertices.isConvex(vertices)) {
  // vertices are convex, so just create a body normally
@@ -229,6 +232,10 @@ var Bodies = {};
  chunkVertices.push({ x: chunk.vertices[j][0], y: chunk.vertices[j][1] });
  }
 
+ // skip small chunks
+ if (minimumArea > 0 && Vertices.area(chunkVertices) < minimumArea)
+ continue;
+
  // create a compound part
  parts.push(
  Body.create(Common.extend({