0-based material indices

python/damask/_geom.py

@@ -687,10 +687,10 @@ class Geom:
 
 
     def renumber(self):
-        """Renumber sorted material indices to 1,...,N."""
+        """Renumber sorted material indices to 0,...,N-1."""
         renumbered = np.empty(self.grid,dtype=self.material.dtype)
         for i, oldID in enumerate(np.unique(self.material)):
-            renumbered = np.where(self.material == oldID, i+1, renumbered)
+            renumbered = np.where(self.material == oldID, i, renumbered)
 
         return Geom(material = renumbered,
                     size     = self.size,

python/tests/test_Geom.py

@@ -176,6 +176,7 @@ class TestGeom:
         material = default.material.copy()
         for m in np.unique(material):
             material[material==m] = material.max() + np.random.randint(1,30)
+        default.material -= 1
         modified = Geom(material,
                         default.size,
                         default.origin)