From e6f7d2ac79020197fba79d99048ccbfd27c1e02f Mon Sep 17 00:00:00 2001
From: Mugen87 <michael.herzog@human-interactive.org>
Date: Wed, 14 Oct 2015 16:24:43 +0200
Subject: [PATCH] avoid unnecessary Math.sqrt operations

---
 src/math/Matrix4.js | 4 ++--
 src/math/Vector3.js | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/math/Matrix4.js b/src/math/Matrix4.js
index ab6d63f3be..7fad9b70d5 100644
--- a/src/math/Matrix4.js
+++ b/src/math/Matrix4.js
@@ -341,7 +341,7 @@ THREE.Matrix4.prototype = {
 
 			z.subVectors( eye, target ).normalize();
 
-			if ( z.length() === 0 ) {
+			if ( z.lengthSq() === 0 ) {
 
 				z.z = 1;
 
@@ -349,7 +349,7 @@ THREE.Matrix4.prototype = {
 
 			x.crossVectors( up, z ).normalize();
 
-			if ( x.length() === 0 ) {
+			if ( x.lengthSq() === 0 ) {
 
 				z.x += 0.0001;
 				x.crossVectors( up, z ).normalize();
diff --git a/src/math/Vector3.js b/src/math/Vector3.js
index 2c430ad52e..d53f32ed4a 100644
--- a/src/math/Vector3.js
+++ b/src/math/Vector3.js
@@ -701,7 +701,7 @@ THREE.Vector3.prototype = {
 
 	angleTo: function ( v ) {
 
-		var theta = this.dot( v ) / ( this.length() * v.length() );
+		var theta = this.dot( v ) / ( Math.sqrt( this.lengthSq() * v.lengthSq() ) );
 
 		// clamp, to handle numerical problems
 
-- 
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