diff --git a/calib/nmail3.txt b/calib/nmail3.txt
new file mode 100644
index 00000000..e69de29b
diff --git a/droid_slam/droid.py b/droid_slam/droid.py
index fe99c5ca..dbb30934 100644
--- a/droid_slam/droid.py
+++ b/droid_slam/droid.py
@@ -8,6 +8,7 @@
 from droid_frontend import DroidFrontend
 from droid_backend import DroidBackend
 from trajectory_filler import PoseTrajectoryFiller
+from cdsmvsnet import CDSMVSNet
 
 from collections import OrderedDict
 from torch.multiprocessing import Process
@@ -20,6 +21,15 @@ def __init__(self, args):
         self.args = args
         self.disable_vis = args.disable_vis
 
+        # dense depth prediction
+        self.mvsnet = CDSMVSNet(refine=True, ndepths=(64, 32, 8), depth_interals_ratio=(4, 2, 1))
+        mvsnet_ckpt = torch.load(args.mvsnet_ckpt)
+        state_dict = OrderedDict([
+            (k.replace("module.", ""), v) for (k, v) in torch.load(mvsnet_ckpt["state_dict"]).items()
+        ])
+        self.mvsnet.load_state_dict(state_dict)
+        self.mvsnet.to("cuda:0").eval()
+
         # store images, depth, poses, intrinsics (shared between processes)
         self.video = DepthVideo(args.image_size, args.buffer, stereo=args.stereo)
 
@@ -27,7 +37,7 @@ def __init__(self, args):
         self.filterx = MotionFilter(self.net, self.video, thresh=args.filter_thresh)
 
         # frontend process
-        self.frontend = DroidFrontend(self.net, self.video, self.args)
+        self.frontend = DroidFrontend(self.net, self.video, self.mvsnet, self.args)
         
         # backend process
         self.backend = DroidBackend(self.net, self.video, self.args)
diff --git a/droid_slam/droid_frontend.py b/droid_slam/droid_frontend.py
index b69bc943..25393811 100644
--- a/droid_slam/droid_frontend.py
+++ b/droid_slam/droid_frontend.py
@@ -4,14 +4,15 @@
 
 from lietorch import SE3
 from factor_graph import FactorGraph
+from cdsmvsnet import CDSMVSNet
 
 
 class DroidFrontend:
-    def __init__(self, net, video, args):
+    def __init__(self, net, video, mvsnet, args):
         self.video = video
         self.update_op = net.update
         self.graph = FactorGraph(video, net.update, max_factors=48)
-        self.mvsnet = CDS
+        self.mvsnet = mvsnet
 
         # local optimization window
         self.t0 = 0
@@ -66,6 +67,17 @@ def __update(self):
             for itr in range(self.iters2):
                 self.graph.update(None, None, use_inactive=True)
 
+        # refine depths
+        if self.mvsnet is not None:
+            ref_id, src_ids = self.t1 - 3, [self.t1-5, self.t1-4, self.t1-2, self.t1-1]
+            img_ids = [ref_id] + src_ids
+            intrinsics = self.video.intrinsics[img_ids]
+            poses = SE3(self.video.poses[img_ids])
+            ref_disp = self.video.disp[ref_id]
+            val_depths = ref_disp[(ref_disp > 0.001) & (ref_disp < 1000)]
+            min_d, max_d = val_depths.min(), val_depths.max()
+            d_interval = (max_d - min_d) / 192
+            depth_values = torch.arange(min_d, max_d, d_interval).unsqueeze(0)
         # set pose for next itration
         self.video.poses[self.t1] = self.video.poses[self.t1-1]
         self.video.disps[self.t1] = self.video.disps[self.t1-1].mean()