diff --git a/src/diffusion/augmentation.py b/src/diffusion/augmentation.py
index 69f0a31..1429fc9 100644
--- a/src/diffusion/augmentation.py
+++ b/src/diffusion/augmentation.py
@@ -22,21 +22,14 @@ def centre_random_augmentation(
     device = atom_positions.x.device
 
     # Center the atoms
-    center = atom_positions.mean(dim=-1, keepdim=True)
+    center = atom_positions.mean(dim=1, keepdim=True)
     atom_positions = atom_positions - center
 
     # Sample random rotation
-    quaternions = torch.randn(batch_size, 4, device=device)
-    rots = Rot3Array.from_quaternion(w=quaternions[:, 0],
-                                     x=quaternions[:, 1],
-                                     y=quaternions[:, 2],
-                                     z=quaternions[:, 3],
-                                     normalize=True)  # (bs)
-    rots = rots.unsqueeze(-1)  # (bs, 1)
+    rots = Rot3Array.uniform_random((batch_size, 1), device)
 
-    # Sample random translation
-    trans = s_trans * Vec3Array.from_array(torch.randn((batch_size, 3), device=device))
-    trans = trans.unsqueeze(-1)  # (bs, 1)
+    # Sample random translation from normal distribution
+    trans = s_trans * Vec3Array.randn((batch_size, 1), device)
 
     # Apply
     atom_positions = rots.apply_to_point(atom_positions) + trans
diff --git a/src/utils/geometry/rotation_matrix.py b/src/utils/geometry/rotation_matrix.py
index cb5e06a..61e1488 100644
--- a/src/utils/geometry/rotation_matrix.py
+++ b/src/utils/geometry/rotation_matrix.py
@@ -147,6 +147,16 @@ def from_array(cls, array: torch.Tensor) -> Rot3Array:
         rc = [torch.unbind(e, dim=-1) for e in rows]
         return cls(*[e for row in rc for e in row])
 
+    @classmethod
+    def uniform_random(cls, shape, device='cpu') -> Rot3Array:
+        """Generates a random rotation of given shape."""
+        quaternions = torch.randn((*shape, 4), device=device)
+        return Rot3Array.from_quaternion(w=quaternions[..., 0],
+                                         x=quaternions[..., 1],
+                                         y=quaternions[..., 2],
+                                         z=quaternions[..., 3],
+                                         normalize=True)
+
     def to_tensor(self) -> torch.Tensor:
         """Convert Rot3Array to array of shape [..., 3, 3]."""
         return torch.stack(
diff --git a/src/utils/geometry/vector.py b/src/utils/geometry/vector.py
index c19d199..146e5df 100644
--- a/src/utils/geometry/vector.py
+++ b/src/utils/geometry/vector.py
@@ -166,6 +166,14 @@ def cat(cls, vecs: List[Vec3Array], dim: int) -> Vec3Array:
             torch.cat([v.z for v in vecs], dim=dim),
         )
 
+    @classmethod
+    def randn(cls, shape, device="cpu"):
+        return cls(
+            torch.randn(shape, dtype=torch.float32, device=device),
+            torch.randn(shape, dtype=torch.float32, device=device),
+            torch.randn(shape, dtype=torch.float32, device=device),
+        )
+
 
 def square_euclidean_distance(
         vec1: Vec3Array,