diff --git a/configs/custom/default_ubd_inward_facing.py b/configs/custom/default_ubd_inward_facing.py
new file mode 100644
index 0000000..63d7b63
--- /dev/null
+++ b/configs/custom/default_ubd_inward_facing.py
@@ -0,0 +1,52 @@
+_base_ = '../default.py'
+
+basedir = './logs/custom'
+
+data = dict(
+    dataset_type='llff',
+    spherify=True,
+    llffhold=0,
+    bd_factor=None,
+    white_bkgd=True,
+    rand_bkgd=True,
+    unbounded_inward=True,
+    load2gpu_on_the_fly=True,
+)
+
+coarse_train = dict(N_iters=0)
+
+fine_train = dict(
+    N_iters=40000,
+    N_rand=4096,
+    lrate_decay=80,
+    ray_sampler='flatten',
+    weight_nearclip=0.0,
+    weight_distortion=0.01,
+    pg_scale=[2000,4000,6000,8000,10000,12000,14000,16000],
+    tv_before=20000,
+    tv_dense_before=20000,
+    weight_tv_density=1e-6,
+    weight_tv_k0=1e-7,
+)
+
+alpha_init = 1e-4
+stepsize = 0.5
+
+fine_model_and_render = dict(
+    num_voxels=320**3,
+    num_voxels_base=320**3,
+    alpha_init=alpha_init,
+    stepsize=stepsize,
+    fast_color_thres={
+        '_delete_': True,
+        0   : alpha_init*stepsize/10,
+        1500: min(alpha_init, 1e-4)*stepsize/5,
+        2500: min(alpha_init, 1e-4)*stepsize/2,
+        3500: min(alpha_init, 1e-4)*stepsize/1.5,
+        4500: min(alpha_init, 1e-4)*stepsize,
+        5500: min(alpha_init, 1e-4),
+        6500: 1e-4,
+    },
+    world_bound_scale=1,
+)
+