diff --git a/src/brittle_star_project/environment/obs_processing.py b/src/brittle_star_project/environment/obs_processing.py
index 14b48f2..73c2e94 100644
--- a/src/brittle_star_project/environment/obs_processing.py
+++ b/src/brittle_star_project/environment/obs_processing.py
@@ -105,6 +105,7 @@ def create_obs_processor(
             # -------- SPLIT TO SEGMENTS --------
             if key in _JOINT_SCALED_KEYS:
                 if morph_mode == MorphMode.SEGMENT:
+                    # TODO: remove magic constants
                     center_size = num_arms * 3 * 2
                     v_center = v[:center_size].reshape(num_arms, 3 * 2)  # (arms, 6)
                     v_segs = v[center_size:].reshape(-1, 2)  # (segs, 2)
diff --git a/tests/test_network_shapes.py b/tests/test_network_shapes.py
index e1a7a1a..aad79fc 100644
--- a/tests/test_network_shapes.py
+++ b/tests/test_network_shapes.py
@@ -20,9 +20,18 @@ def test_centralized_forward_pass_with_padding():
         "segment_contact": jnp.zeros((batch_size, 14)),
     }
 
+    segments_per_arm = jnp.array((4, 0, 4, 2, 4))
+    num_segments = segments_per_arm.sum().item()
+    num_arms = jnp.where(segments_per_arm > 0, 1, 0).sum().item()
+
     # 2. Process and Pad Observation
-    masks = compute_padding_masks(segments_per_arm=(4, 0, 4, 2, 4))
-    obs_processor = create_obs_processor(bounds_dict={}, padding_masks=masks)
+    masks = compute_padding_masks(segments_per_arm=list(segments_per_arm))
+    obs_processor = create_obs_processor(
+        bounds_dict={},
+        num_segments=num_segments,
+        num_arms=num_arms,
+        padding_masks=masks,
+    )
     global_state = obs_processor(amputated_obs)
 
     # 40 + 40 + 20 = 100 dimensions
diff --git a/tests/test_target_direction.py b/tests/test_target_direction.py
index a81cdf1..825c50c 100644
--- a/tests/test_target_direction.py
+++ b/tests/test_target_direction.py
@@ -1,6 +1,7 @@
 import jax.numpy as jnp
 
 from brittle_star_project.configs.main_config import BrittleStarConfig
+from brittle_star_project.environment.env_config import MorphMode
 from brittle_star_project.environment.env_types import Backend
 from brittle_star_project.environment.BrittleStarJaxEnvWrapper import BrittleStarJaxEnvWrapper
 from brittle_star_project.environment.obs_processing import create_obs_processor
@@ -43,8 +44,16 @@ def test_processor_converts_to_egocentric_direction():
     cfg = BrittleStarConfig()
     env = BrittleStarJaxEnvWrapper.default(num_envs=1, backend=Backend.MJX)
 
+    segments_per_arm = jnp.array((4, 4, 4, 4, 4))
+    num_segments = segments_per_arm.sum().item()
+    num_arms = jnp.where(segments_per_arm > 0, 1, 0).sum().item()
+
     obs_processor = create_obs_processor(
-        bounds_dict=cfg.obs_bounds.to_bounds_dict(), padding_masks=env.padding_masks
+        bounds_dict=cfg.obs_bounds.to_bounds_dict(),
+        num_segments=num_segments,
+        num_arms=num_arms,
+        padding_masks=env.padding_masks,
+        morph_mode=MorphMode.CENTRALIZED,
     )
 
     env_state = env.reset(seed=42)
@@ -66,13 +75,19 @@ def test_processor_converts_to_egocentric_direction():
     processed_2 = obs_processor(dummy_obs_2)
 
     # Find the indices of the elements that changed
-    diff_array = jnp.abs(processed_1[0] - processed_2[0])
+    diff_array = jnp.abs(processed_1[0, 0] - processed_2[0, 0])
     changed_indices = jnp.where(diff_array > 1e-4)[0]
 
-    local_target = processed_1[0, changed_indices]
+    # (143,)
+    local_target = processed_1[0, 0, changed_indices]
+
+    # (2,)
     expected_local_target = jnp.array([0.0, -1.0])
 
     assert jnp.sum(jnp.abs(local_target - expected_local_target)) < 1e-4, (
         f"The obs_processor did not correctly rotate the vector to egocentric. "
         f"Expected {expected_local_target}, but got {local_target}."
     )
+
+
+test_processor_converts_to_egocentric_direction()