From c3f58fd208ae48c70be404ba694743abcae56a27 Mon Sep 17 00:00:00 2001
From: Philip Eisenlohr <eisenlohr@egr.msu.edu>
Date: Thu, 24 Nov 2016 09:37:57 -0500
Subject: [PATCH] unified processing order of quaternion properties to w,x,y,z

---
 lib/damask/orientation.py | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/lib/damask/orientation.py b/lib/damask/orientation.py
index 0ef6725cf..7d97d2c81 100644
--- a/lib/damask/orientation.py
+++ b/lib/damask/orientation.py
@@ -137,18 +137,18 @@ class Quaternion:
     def __imul__(self, other):
       """In-place multiplication"""
       try:                                                        # Quaternion
+          Aw = self.w
           Ax = self.x
           Ay = self.y
           Az = self.z
-          Aw = self.w
+          Bw = other.w
           Bx = other.x
           By = other.y
           Bz = other.z
-          Bw = other.w
-          self.x =  Ax * Bw + Ay * Bz - Az * By + Aw * Bx
-          self.y = -Ax * Bz + Ay * Bw + Az * Bx + Aw * By
-          self.z =  Ax * By - Ay * Bx + Az * Bw + Aw * Bz
-          self.w = -Ax * Bx - Ay * By - Az * Bz + Aw * Bw
+          self.w = - Ax * Bx - Ay * By - Az * Bz + Aw * Bw
+          self.x = + Ax * Bw + Ay * Bz - Az * By + Aw * Bx
+          self.y = - Ax * Bz + Ay * Bw + Az * Bx + Aw * By
+          self.z = + Ax * By - Ay * Bx + Az * Bw + Aw * Bz
       except: pass
       return self