diff --git a/processing/pre/geom_unpack.py b/processing/pre/geom_unpack.py
index 4cac76c5f..fb5b58198 100755
--- a/processing/pre/geom_unpack.py
+++ b/processing/pre/geom_unpack.py
@@ -1,7 +1,9 @@
 #!/usr/bin/env python3
 # -*- coding: UTF-8 no BOM -*-
 
-import os,sys,math
+import os
+import sys
+import math
 import numpy as np
 from optparse import OptionParser
 import damask
@@ -33,48 +35,19 @@ parser.set_defaults(oneD = False,
 if filenames == []: filenames = [None]
 
 for name in filenames:
-  try:
-    table = damask.ASCIItable(name = name,
-                              buffered = False, labeled = False)
-  except: continue
+  if name is None:
+    virt_file = StringIO(''.join(sys.stdin.read()))
+    geom = damask.Geom.from_file(virt_file)
+  else:
+    geom = damask.Geom.from_file(name)
+
   damask.util.report(scriptName,name)
 
-# --- interpret header ----------------------------------------------------------------------------
-
-  table.head_read()
-  info,extra_header = table.head_getGeom()
-  damask.util.report_geom(info)
-
-  errors = []
-  if np.any(info['grid'] < 1):    errors.append('invalid grid a b c.')
-  if np.any(info['size'] <= 0.0): errors.append('invalid size x y z.')
-  if errors != []:
-    damask.util.croak(errors)
-    table.close(dismiss = True)
-    continue
-
-# --- write header ---------------------------------------------------------------------------------
-
-  table.labels_clear()
-  table.info_clear()
-  table.info_append(extra_header+[
-    scriptID + ' ' + ' '.join(sys.argv[1:]),
-    "grid\ta {grid[0]}\tb {grid[1]}\tc {grid[2]}".format(grid=info['grid']),
-    "size\tx {size[0]}\ty {size[1]}\tz {size[2]}".format(size=info['size']),
-    "origin\tx {origin[0]}\ty {origin[1]}\tz {origin[2]}".format(origin=info['origin']),
-    "homogenization\t{homog}".format(homog=info['homogenization']),
-    "microstructures\t{microstructures}".format(microstructures=info['microstructures']),
-    ])
-  table.head_write()
+  geom.add_comment(scriptID + ' ' + ' '.join(sys.argv[1:]))
   
-# --- write microstructure information ------------------------------------------------------------
-
-  microstructure = table.microstructure_read(info['grid'])                                          # read microstructure
-  formatwidth = int(math.floor(math.log10(microstructure.max())+1))                                 # efficient number printing format
-  table.data = microstructure if options.oneD else \
-               microstructure.reshape((info['grid'][0],info['grid'][1]*info['grid'][2]),order='F').transpose()
-  table.data_writeArray('%%%ii'%(formatwidth),delimiter = ' ')
-    
-#--- output finalization --------------------------------------------------------------------------
-
-  table.close()                                                                                     # close ASCII table
+  damask.util.croak('\n'.join(geom.info()))
+  
+  if name is None:
+    sys.stdout.write(str(geom))
+  else:
+    geom.to_file(name)
diff --git a/python/damask/geom.py b/python/damask/geom.py
index 5c34eeebb..def9e9f0c 100644
--- a/python/damask/geom.py
+++ b/python/damask/geom.py
@@ -86,7 +86,7 @@ class Geom():
       items = line.split()
       if len(items) == 3:
         if   items[1].lower() == 'of':
-          items = np.ones(float(items[0]))*int(items[2])
+          items = np.ones(int(items[0]))*float(items[2])
         elif items[1].lower() == 'to':
           items = np.linspace(int(items[0]),int(items[2]),
                               abs(int(items[2])-int(items[0]))+1,dtype=float)