diff --git a/interp/grid/DDD.py b/interp/grid/DDD.py
index 2b2fcb3..0cd7d6c 100644
--- a/interp/grid/DDD.py
+++ b/interp/grid/DDD.py
@@ -5,24 +5,24 @@ import numpy as np
 
 class rect_grid(basegrid):
   def __init__(self, xres = 5, yres = 5, zres = 5):
-    xmin = -1.0
-    xmax =  1.0
+    xmin  = 0.0
+    xmax  = 1.0
     xspan = xmax - xmin
-    xdel = xspan / float(xres - 1)
+    xdel  = xspan / float(xres - 1)
 
-    ymin = -1.0
-    ymay =  1.0
+    ymin  = 0.0
+    ymay  = 1.0
     yspan = ymay - ymin
-    ydel = yspan / float(yres - 1)
+    ydel  = yspan / float(yres - 1)
 
-    zmin = -1.0
-    zmaz =  1.0
+    zmin  = 0.0
+    zmaz  = 1.0
     zspan = zmaz - zmin
-    zdel = zspan / float(zres - 1)
+    zdel  = zspan / float(zres - 1)
 
 
     verts = []
-    q      = []
+    q     = np.zeros(xres * yres * zres)
     for x in xrange(xres):
       cur_x = xmin + (x * xdel)
       for y in xrange(yres):
@@ -30,7 +30,7 @@ class rect_grid(basegrid):
         for z in xrange(zres):
           cur_z = zmin + (z * zdel)
           verts.append([cur_x, cur_y, cur_z])
-          q.append(baker_exact_3D((cur_x, cur_y, cur_z)))
+
     basegrid.__init__(self, verts, q)