diff --git a/interp/grid/DDD.py b/interp/grid/DDD.py
index 0cd7d6c..4ec579f 100644
--- a/interp/grid/DDD.py
+++ b/interp/grid/DDD.py
@@ -1,6 +1,8 @@
 from interp.grid.delaunay import dgrid as basegrid
 from interp.tools import baker_exact_3D, log
 
+from itertools import product
+
 import numpy as np
 
 class rect_grid(basegrid):
@@ -36,27 +38,40 @@ class rect_grid(basegrid):
 
 
 class random_grid(rect_grid):
-  def __init__(self, num_verts = 10):
+  def __init__(self, num_verts = 100):
     verts = []
-    q = []
 
     r = np.random
 
     appx_side_res = int(np.power(num_verts, 1/3.0))
-    log.debug("appx_side_res: %d" % appx_side_res)
     delta = 1.0 / float(appx_side_res)
 
-    for x in xrange(appx_side_res + 1):
-      pass
+    # populate all corners
+    verts = [i for i in product((0,1), repeat = 3)]
 
-    for i in xrange(num_verts):
-      cur_x = r.rand()
-      cur_y = r.rand()
-      cur_z = r.rand()
 
-      verts.append([cur_x, cur_y, cur_z])
-      q.append(baker_exact_3D((cur_x, cur_y, cur_z)))
-    basegrid.__init__(self, verts, q)
+    # populate the edges (bottom and top squares)
+    for z in (0,1):
+      for x in xrange(1, appx_side_res):
+        cur_x = x * delta
+        for cur_y in (0, 1):
+          new_point = [cur_x, cur_y, z]
+          verts.append(new_point)
 
-    self.verts = np.array(self.verts)
-    self.q      = np.array(self.q)
+      for y in xrange(1, appx_side_res):
+        cur_y = y * delta
+        for cur_x in (0, 1):
+          new_point = [cur_x, cur_y, z]
+          verts.append(new_point)
+
+    # populate side edges
+    for x in (0,1):
+      for y in (0,1):
+        for z in xrange(1, appx_side_res):
+          cur_z = z * delta
+          verts.append((x,y,cur_z))
+
+    verts.extend(np.random.random((num_verts - 12 * appx_side_res, 3)))
+
+    q = np.zeros(len(verts))
+    basegrid.__init__(self, np.array(verts), q)