From f97cd2b08c679141e0fe29e24fa655ec0fe22f3c Mon Sep 17 00:00:00 2001
From: Val Erastov <xibyte@gmail.com>
Date: Tue, 25 Aug 2015 22:28:44 -0700
Subject: [PATCH] fix zero triangles error

---
 web/app/workbench.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/web/app/workbench.js b/web/app/workbench.js
index fff2d4f7..57f1c9c7 100644
--- a/web/app/workbench.js
+++ b/web/app/workbench.js
@@ -636,6 +636,9 @@ TCAD.craft._makeFromPolygons = function(polygons) {
       var a = refs[i][0] + off;
       var b = refs[i][1] + off;
       var c = refs[i][2] + off;
+      if (points[b].minus(points[a]).cross(points[c].minus(points[a])).length() === 0)  {
+        continue;
+      }
       var csgPoly = new CSG.Polygon([
         new CSG.Vertex(csgVec(points[a]), csgVec(poly.normal)),
         new CSG.Vertex(csgVec(points[b]), csgVec(poly.normal)),