diff --git a/viz/server.py b/viz/server.py
index 2560a31..7899c3a 100644
--- a/viz/server.py
+++ b/viz/server.py
@@ -96,9 +96,11 @@ def _load_data() -> dict:
             import open3d as o3d
             pcd = o3d.io.read_point_cloud(_PLY_PATH)
             n_pts = len(pcd.points)
-            if n_pts > 200_000:
-                vox = float((pcd.get_max_bound() - pcd.get_min_bound()).max()) * (200_000 / n_pts) ** (1/3)
-                pcd = pcd.voxel_down_sample(float(vox))
+            MAX_PTS = 300_000
+            if n_pts > MAX_PTS:
+                vol = float(np.prod(pcd.get_max_bound() - pcd.get_min_bound()))
+                vox = max((vol / MAX_PTS) ** (1/3), 0.02)
+                pcd = pcd.voxel_down_sample(vox)
             pts = np.asarray(pcd.points)
             ce = out.get("origin", {}).get("easting", 0.0)
             cn = out.get("origin", {}).get("northing", 0.0)