diff --git a/src/filter_radius_assign/RadiusAssignFilter.cpp b/src/filter_radius_assign/RadiusAssignFilter.cpp
index 6ce7af0..cfcff24 100644
--- a/src/filter_radius_assign/RadiusAssignFilter.cpp
+++ b/src/filter_radius_assign/RadiusAssignFilter.cpp
@@ -74,14 +74,14 @@ void RadiusAssignFilter::doOneNoDomain(PointRef &pointSrc)
     PointIdList iNeighbors;
     if (m_args->search3d) iNeighbors = refView->build3dIndex().radius(pointSrc, m_args->m_radius);
     else iNeighbors = refView->build2dIndex().radius(pointSrc, m_args->m_radius);
-
+    
     if (iNeighbors.size() == 0)
         return;
 
     if (!m_args->search3d && (m_args->m_max2d_below>=0 || m_args->m_max2d_above>=0))
     {
         double Zsrc = pointSrc.getFieldAs<double>(Dimension::Id::Z);
-
+        
         std::set<double> ZNeib;
         for (PointId ptId : iNeighbors)
         {
diff --git a/test/test_radius_assign.py b/test/test_radius_assign.py
index 0a7c1bd..2ecd0f2 100755
--- a/test/test_radius_assign.py
+++ b/test/test_radius_assign.py
@@ -14,6 +14,7 @@
 pt_ini = (pt_x, pt_y, pt_z, 1)
 
 numeric_precision = 4
+numeric_precision_z = 2
 distance_radius = 1
 
 
@@ -28,6 +29,10 @@ def distance3d(pt1, pt2):
     )
 
 
+def distanceZ(pt1, pt2):
+    return round(pt1[2] - pt2[2], numeric_precision_z)
+
+
 def run_filter(arrays_las, distance_radius, search_3d, limit_z_above=-1, limit_w_below=-1):
 
     filter = "filters.radius_assign"
@@ -154,7 +159,7 @@ def test_radius_assign_2d_cylinder_below():
 
     def func_test(pt):
         distance_i = distance2d(pt_ini, pt)
-        distance_z = pt[2] - pt_ini[2]
+        distance_z = distanceZ(pt, pt_ini)
         if distance_i < distance_radius and distance_z < limit_z_below:
             return 1
         return 0
@@ -177,7 +182,7 @@ def test_radius_assign_2d_cylinder_above():
 
     def func_test(pt):
         distance_i = distance2d(pt_ini, pt)
-        distance_z = pt_ini[2] - pt[2]
+        distance_z = distanceZ(pt_ini, pt)
         if distance_i < distance_radius and distance_z < limit_z_above:
             return 1
         return 0
@@ -197,7 +202,7 @@ def test_radius_assign_2d_cylinder_above_below_null():
 
     def func_test(pt):
         distance_i = distance2d(pt_ini, pt)
-        distance_z = pt_ini[2] - pt[2]
+        distance_z = distanceZ(pt_ini, pt)
         if distance_i < distance_radius and distance_z == 0:
             return 1
         return 0
@@ -217,7 +222,7 @@ def test_radius_assign_2d_cylinder_above_null_bellow_all():
 
     def func_test(pt):
         distance_i = distance2d(pt_ini, pt)
-        distance_z = pt[2] - pt_ini[2]
+        distance_z = distanceZ(pt, pt_ini)
         if distance_i < distance_radius and distance_z <= 0:
             return 1
         return 0
@@ -261,13 +266,12 @@ def test_radius_assign_2d_cylinder_above_and_bellow(execution_number):
 
     def func_test(pt):
         distance_i = distance2d(pt_ini, pt)
-        distance_z = pt_ini[2] - pt[2]
-        if (
-            distance_i < distance_radius
-            and distance_z <= limit_z_above
-            and (-distance_z) <= limit_z_below
-        ):
-            return 1
+        distance_z = distanceZ(pt, pt_ini)  # src - ref
+        if distance_i < distance_radius:
+            if distance_z <= 0 and (-distance_z) <= limit_z_above:  # src est sur ref
+                return 1
+            if distance_z >= 0 and distance_z <= limit_z_below:  # src est sous ref
+                return 1
         return 0
 
     arrays_las, nb_points_take_2d = build_random_points_around_one_point(func_test, points)
@@ -298,9 +302,10 @@ def test_radius_assign_2d_cylinder(limit_z_above, limit_z_below):
     def func_test(pt):
         distance_i = distance2d(pt_ini, pt)
         if distance_i < distance_radius:
-            if (limit_z_above >= 0) and ((pt_ini[2] - pt[2]) > limit_z_above):
+            distance_z = distanceZ(pt, pt_ini)  # src - ref
+            if limit_z_above >= 0 and distance_z <= 0 and (-distance_z) > limit_z_above:
                 return 0
-            if (limit_z_below >= 0) and ((pt[2] - pt_ini[2]) > limit_z_below):
+            if limit_z_below >= 0 and distance_z >= 0 and distance_z > limit_z_below:
                 return 0
             return 1
         else: