diff --git a/lidar_pipeline/visualizations.py b/lidar_pipeline/visualizations.py
index 3851f26..0b16e2c 100644
--- a/lidar_pipeline/visualizations.py
+++ b/lidar_pipeline/visualizations.py
@@ -602,7 +602,7 @@ def generate_svf(dem_file, basename, vis_dir, resolution, shared=None):
 
         radii_m = [25, 50, 100]
         radius_weights = [0.3, 0.4, 0.3]  # Medium range weighted more
-        max_dist = min(int(100 / res), 300)
+        max_dist = int(max(radii_m) / res)  # rayon réel en pixels, non tronqué
         n_dirs = 16
 
         pos_angles, neg_angles = _ray_trace_horizons(dem, rows, cols, res, n_dirs, max_dist, radii_m)
@@ -642,7 +642,7 @@ def generate_openness(dem_file, basename, vis_dir, resolution, positive=True, sh
             _prepare_dem_for_raycast(dem_file, shared, resolution)
 
         radii_m = [25, 50, 100]
-        max_dist = min(int(100 / res), 300)
+        max_dist = int(max(radii_m) / res)  # rayon réel en pixels, non tronqué
         n_dirs = 8
 
         pos_angles, neg_angles = _ray_trace_horizons(dem, rows, cols, res, n_dirs, max_dist, radii_m)