From 6c7a4898de89c3b1872ccaa080a9c8251e41a275 Mon Sep 17 00:00:00 2001
From: Ben Houston <ben@exocortex.com>
Date: Fri, 19 Dec 2014 12:11:49 -0500
Subject: [PATCH] Matrix4.makeShear - standard shear constructor with optional
 Autodesk Maya style construction.

---
 src/math/Matrix4.js | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/src/math/Matrix4.js b/src/math/Matrix4.js
index 331178df72..80c77e0c64 100644
--- a/src/math/Matrix4.js
+++ b/src/math/Matrix4.js
@@ -146,6 +146,35 @@ THREE.Matrix4.prototype = {
 
 	}(),
 
+	makeShear: function ( vector3Shear, reverseStyle ) {
+
+		var xy = vector3Shear.x;
+    	var xz = vector3Shear.y;
+    	var yz = vector3Shear.z;
+
+		if ( reverseStyle ) {
+
+		  this.set(
+		    1,  0,  0,  0,
+		    xy, 1,  0,  0,
+		    xz, yz, 1,  0,
+		    0,   0,  0,  1
+		  );
+
+		} else {
+		  // Maya style
+		  this.set(
+		    1,  xy, xz, 0,
+		    0,  1,  yz, 0,
+		    0,  0,  1,  0,
+		    0,  0,  0,  1
+		  );
+		}
+
+	    return this;
+
+	},
+
 	makeRotationFromEuler: function ( euler ) {
 
 		if ( euler instanceof THREE.Euler === false ) {
-- 
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