--- trunk/src/restraints/ObjectRestraint.cpp	2009/11/25 20:02:06	1390
+++ branches/development/src/restraints/ObjectRestraint.cpp	2013/02/20 15:39:39	1850
@@ -35,8 +35,9 @@
  *                                                                      
  * [1]  Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).             
  * [2]  Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).          
- * [3]  Sun, Lin & Gezelter, J. Chem. Phys. 128, 24107 (2008).          
- * [4]  Vardeman & Gezelter, in progress (2009).                        
+ * [3]  Sun, Lin & Gezelter, J. Chem. Phys. 128, 234107 (2008).          
+ * [4]  Kuang & Gezelter,  J. Chem. Phys. 133, 164101 (2010).
+ * [5]  Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
  */
 
 #include "restraints/ObjectRestraint.hpp"
@@ -46,13 +47,12 @@ namespace OpenMD {
   void ObjectRestraint::calcForce(Vector3d struc) {
 
     pot_ = 0.0;
-    
     if (restType_ & rtDisplacement) {
       Vector3d del = struc - refPos_;
-      RealType r = del.length();  
+      RealType r = del.length();
       Vector3d frc = -kDisp_ * del;
       RealType p = 0.5 * kDisp_ * del.lengthSquare();
-      pot_ += p;
+      pot_ = p;
       force_ = frc * scaleFactor_;
       restInfo_[rtDisplacement] = std::make_pair(r,p);
     }
@@ -71,13 +71,12 @@ namespace OpenMD {
 
       Quat4d quat = temp.toQuaternion();
 
-      RealType twistAngle, swingAngle;
+      RealType twistAngle;
       Vector3d swingAxis;
-      RealType tw, swingX, swingY;
+      RealType swingX, swingY;
       
-      quat.getTwistSwingAxisAngle(twistAngle, swingAngle, swingAxis);
-      quat.toSwingTwist(tw, swingX, swingY);
-      
+      quat.toSwingTwist(swingX, swingY, twistAngle);
+
       RealType dVdtwist, dVdswingX, dVdswingY;
       RealType dTwist, dSwingX, dSwingY;
       RealType p;