From 5df5fc57f0c0324093023d95201cf40e445acd34 Mon Sep 17 00:00:00 2001
From: "Mr.doob" <info@mrdoob.com>
Date: Tue, 18 Aug 2015 23:21:47 -0700
Subject: [PATCH] WebGLObjects: Faster checkEdge.

---
 src/renderers/webgl/WebGLObjects.js | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/renderers/webgl/WebGLObjects.js b/src/renderers/webgl/WebGLObjects.js
index eb40f7d61f..fe706aaafb 100644
--- a/src/renderers/webgl/WebGLObjects.js
+++ b/src/renderers/webgl/WebGLObjects.js
@@ -271,10 +271,11 @@ THREE.WebGLObjects = function ( gl, properties, info ) {
 
 	function checkEdge( edges, a, b ) {
 
-		if ( edges[ a + '|' + b ] === true ) return false;
+		var hash = a < b ? a + '_' + b : b + '_' + a;
 
-		edges[ a + '|' + b ] = true;
-		edges[ b + '|' + a ] = true;
+		if ( edges.hasOwnProperty( hash ) ) return false;
+
+		edges[ hash ] = 1;
 
 		return true;
 
-- 
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