diff --git a/pyqtUsrObj.py b/pyqtUsrObj.py
index 3c17aa0..0b53001 100644
--- a/pyqtUsrObj.py
+++ b/pyqtUsrObj.py
@@ -518,21 +518,13 @@ class FixTargetFrame(UsrROI):
 
   def get_scan_param(self):
     'returns scan parameters for scanning with deltatau. the format is as used for shapepath'
-    scan=1 # snake motion Y fast, X slow (default)
     grid=self._dscr['grid']
-    self._dscr['size']
-    cnt  =np.array(grid['count'],np.int32)
-    xx, yy=np.meshgrid(range(cnt[0]), range(cnt[1]))
-    if scan==0: # snake motion X fast, Y slow
-      for i in range(1,cnt[1],2):
-        xx[i]=xx[i][::-1]
-    else: # scan==1 # snake motion Y fast, X slow (default)
-      xx=xx.T
-      yy=yy.T
-      for i in range(1, cnt[0], 2):
-        yy[i]=yy[i][::-1]
-
-    pts=np.array([xx.reshape(-1), yy.reshape(-1)], dtype=np.float64).transpose() #*pitch
+    use_trf=self._param.get('use_trf', True)  # do not use coordinate transformation
+    mode=self._param.get('mode',1)
+    cnt=np.array(grid['count'], np.int32)
+    num_pts=cnt.prod()
+    param={'num_pts':num_pts}
+    param.update(self._param)
 
     # TODO: simplify !!!
     t=self.transform() #obj_info(t)
@@ -549,9 +541,32 @@ class FixTargetFrame(UsrROI):
     trf2*=np.asmatrix(((1000, 0, 0), (0, 1000, 0), (0, 0, 1)))
     trf3=np.asmatrix(((pitch[0], 0, 0), (0, pitch[1], 0), (pos[0], pos[1], 1)))
     trf=(trf3*trf2)[:, :2]
-    param={'grid':grid, 'points':pts, 'trf':trf}
-    param.update(self._param)
 
+    if mode in (1,3): # needs all points, not grid
+      scan=1 # snake motion Y fast, X slow (default)
+      xx, yy=np.meshgrid(range(cnt[0]), range(cnt[1]))
+      if scan==0: # snake motion X fast, Y slow
+        for i in range(1,cnt[1],2):
+          xx[i]=xx[i][::-1]
+      else: # scan==1 # snake motion Y fast, X slow (default)
+        xx=xx.T
+        yy=yy.T
+        for i in range(1, cnt[0], 2):
+          yy[i]=yy[i][::-1]
+
+      pts=np.array([xx.reshape(-1), yy.reshape(-1)], dtype=np.float64).transpose() #*pitch
+
+      if not use_trf:
+        pts=(np.hstack((pts, np.ones((pts.shape[0], 1))))*trf).A
+      param['trf']=trf
+      param['points']=pts
+    else:
+      if use_trf:
+        param.update({'grid':grid, 'trf':trf})
+      else:
+        g=grid.copy() #has not be tested !
+        g['pos']=tuple((np.array((0,0,1))*trf).A.reshape(-1).tolist())
+        param.update({'grid':p, 'trf':trf})
     return param
 
 
diff --git a/swissmx.py b/swissmx.py
index 3a6c690..b9b8db8 100755
--- a/swissmx.py
+++ b/swissmx.py
@@ -1535,11 +1535,6 @@ class WndSwissMx(QMainWindow, Ui_MainWindow):
         except AttributeError as e:
           _log.warning(f'no scan parameters for object->skipped:{go}')
           continue
-        trf=np.asmatrix(param['trf'])
-        p=param['points']
-        p=(np.hstack((p,np.ones((p.shape[0],1))))*trf).A
-        param['pts_trf']=p  # transformed points in um motor coordinates
-        param['num_pts']=p.shape[0]
         vb=self.vb
         grp=self._goTracked
         mft=self._moduleFixTarget
@@ -2357,10 +2352,6 @@ object settings:
       use_trf=kwargs.get('use_trf', True) # do not use coordinate transformation
       if not 'mode' in kwargs:
         kwargs['mode']=1
-      if not use_trf:
-        trf=kwargs.pop('trf')
-        points=kwargs['points']
-        kwargs['points']=kwargs.pop('pts_trf')
 
       sp.setup_sync(verbose=sp.verbose&0x40, timeOfs=dt_misc['time_ofs'], timeCor=dt_misc['time_cor'])
       dlg.setLabelText("Download motion program");dlg+=5