--- trunk/OOPSE/libmdtools/ZConstraint.cpp	2004/04/28 22:34:02	1140
+++ trunk/OOPSE/libmdtools/ZConstraint.cpp	2004/04/28 23:09:32	1141
@@ -356,6 +356,8 @@ template<typename T> ZConstraint<T>::ZConstraint(SimIn
       cantPos.push_back(COM[whichDirection]);    
   }
 
+  if(usingSMD)
+    prevCantPos = cantPos;
 #endif 
 
   
@@ -470,6 +472,10 @@ template<typename T> void ZConstraint<T>::update(){
     if(usingSMD)
       cantPos.push_back(COM[whichDirection]);        
   } 
+
+  if(usingSMD)
+  prevCantPos = cantPos;
+
   //
   forcePolicy->update();
 }
@@ -974,6 +980,9 @@ template<typename T> bool ZConstraint<T>::checkZConsSt
     if (diff <= zconsTol && states[i] == zcsMoving){
       states[i] = zcsFixed;
       changed_local = 1;
+
+      if(usingSMD)
+        prevCantPos = cantPos;
 
       if (hasZConsGap)
         endFixTime[i] = info->getTime() + zconsFixTime;
@@ -982,6 +991,9 @@ template<typename T> bool ZConstraint<T>::checkZConsSt
       states[i] = zcsMoving;
       changed_local = 1;   
 
+      if(usingSMD)
+         cantPos = prevCantPos;
+      
       if (hasZConsGap)
         endFixTime[i] = INFINITE_TIME;
     }