Added graficToDensity conversion. Added missing getBoxsize() method. Fixed grafic generation

python/_cosmotool.pyx

@@ -123,6 +123,9 @@ class _PySimulationAdaptor(PySimulationBase):
   def __init__(self,sim):
   
     self.simu = sim
+
+  def getBoxsize(self):
+    return self.simu.BoxSize
     
   def getPositions(self):
     return self.simu.positions

python/cosmotool/grafic.py

@@ -7,7 +7,7 @@ def writeGrafic(filename, field, BoxSize, scalefac, **cosmo):
         checkPoint = 4*11
         
         Nx,Ny,Nz = field.shape
-        delta = BoxSize/Nx
+        delta = BoxSize/Nx/cosmo['h']
         bad = 0.0
         
         f.write(struct.pack("IIIIffffffffI", checkPoint,