diff --git a/history.md b/history.md
index a37a849..c2c8dd0 100644
--- a/history.md
+++ b/history.md
@@ -233,5 +233,5 @@
 ### Version 0.5.6 (Aug 25, 2024)
 * Defining material with float refractive index enabled for FDTDSimulation.add_structure_from_gdsii().
 
-### Version 0.5.7 (Sep 4, 2024)
+### Version 0.5.8 (Sep 4, 2024)
 * New pixelated region class: CirclePixelsRegionwithGroup.
\ No newline at end of file
diff --git a/splayout/__init__.py b/splayout/__init__.py
index cdc578b..4766171 100644
--- a/splayout/__init__.py
+++ b/splayout/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.5.7"
+__version__ = "0.5.8"
 
 ## Submodules
 from . import utils
diff --git a/splayout/components/pixelsregion.py b/splayout/components/pixelsregion.py
index 7dcb5c7..da8b819 100644
--- a/splayout/components/pixelsregion.py
+++ b/splayout/components/pixelsregion.py
@@ -230,6 +230,8 @@ class CirclePixelsRegionwithGroup:
     def __init__(self, bottom_left_corner_point, top_right_corner_point, pixel_radius, fdtd_engine, material=SiO2, z_start=-0.11, z_end=0.11 , group_name = "pixels", matrix_mask = None, relaxing_time = 0):
         self.bottom_left_corner_point = tuple_to_point(bottom_left_corner_point)
         self.top_right_corner_point = tuple_to_point(top_right_corner_point)
+        self.left_down_point = self.bottom_left_corner_point
+        self.right_up_point = self.top_right_corner_point
         self.pixel_radius = pixel_radius
         self.__last_array = None
         self.__lastest_array = None
@@ -253,6 +255,9 @@ def __initialize(self):
 
         self.fdtd_engine.eval("addstructuregroup;")
         self.fdtd_engine.eval("set(\"name\", \""+self.group_name+"\");")
+        self.fdtd_engine.eval("set(\"x\", 0);")
+        self.fdtd_engine.eval("set(\"y\", 0);")
+        self.fdtd_engine.eval("set(\"z\", 0);")
         self.fdtd_engine.fdtd.putv("radius_matrix", self.__lastest_array)
         self.fdtd_engine.fdtd.putv("pixel_radius", self.pixel_radius)
         self.fdtd_engine.fdtd.putv("z_start", self.z_start)