diff --git a/buildings/Facade.py b/buildings/Facade.py
index 715e88d..63b3fa9 100644
--- a/buildings/Facade.py
+++ b/buildings/Facade.py
@@ -6,12 +6,11 @@ from buildings.elements.Window import Window
 from buildings.elements.Balcony import Balcony
 
 class Facade:
-    def __init__(self, rdata, vertices : list[Vertice], height : int, length : int, is_inner_or_outer : COLLUMN_STYLE):
+    def __init__(self, rdata, vertices : list[Vertice], is_inner_or_outer : COLLUMN_STYLE):
         self.rdata = rdata
         self.vertices = vertices
         self.is_inner_or_outer = is_inner_or_outer
-        self.height = height
-        self.length = length
+        self.height, self.length = self.get_dimentions()
         self.padding = 0
         self.window =  self.get_window()
         self.has_balcony = self.has_balcony()
@@ -25,8 +24,8 @@ class Facade:
         for vertice in self.vertices:
             vertice.fill(editor, materials[0], self.height, xpadding = self.padding, zpadding = self.padding)
             with editor.pushTransform(Transform(vertice.point1.position,rotation = vertice.facing.value)):
-                self.build_inter_floor(vertice)
-                self.window.build(editor, vertice.get_len(), self.height, materials)
+                self.window.build(editor, materials)
+                self.build_inter_floor()
         
     def get_window(self) -> Window:
         if self.is_inner_or_outer == COLLUMN_STYLE.OUTER or self.is_inner_or_outer == COLLUMN_STYLE.BOTH:
@@ -35,20 +34,23 @@ class Facade:
         max_width = self.length-2*self.padding
         max_height = min(self.height, self.rdata["windows"]["size"]["max_height"])
             
-        return Window(self.rdata["windows"] ,max_width, max_height)
+        return Window(self.rdata["windows"] ,max_width, max_height, self.length, self.height)
     
     def get_balcony(self) -> Balcony:
-        len = rd.randint(self.rdata["balcony"]["size"]["min_len"], self.rdata["balcony"]["size"]["max_len"])
         max_width = self.length-2*self.padding
-        return Balcony(len, max_width, self.window)
+        return Balcony(self.rdata["balcony"], max_width, self.window)
     
     def build_inter_floor(self):
         if self.has_inter_floor:
-            geometry.placeCuboid(self.editor,(0,self.height,-1),(self.length,self.height,-1),Block(self.materials[4], {"facing": "south", "half": "top"})) 
+            geometry.placeCuboid(self.editor,(0,self.height,0),(self.length-1,self.height,0),Block(self.materials[0])) 
+            geometry.placeCuboid(self.editor,(0,self.height,-1),(self.length-1,self.height,-1),Block(self.materials[4], {"facing": "south", "half": "top"})) 
     
     def has_balcony(self) -> bool:
-        return self.rdata["balcony"] >= rd.random()
+        return self.rdata["balcony"]["proba"] >= rd.random()
     
     def has_inter_floor(self) -> bool:
         return self.rdata["inter_floor"] >= rd.random()
+    
+    def get_dimentions(self) -> tuple[int]:
+        return ( self.vertices[0].get_height(), self.vertices[0].get_len())
     
\ No newline at end of file
diff --git a/buildings/elements/Balcony.py b/buildings/elements/Balcony.py
index fb13129..f5d8d18 100644
--- a/buildings/elements/Balcony.py
+++ b/buildings/elements/Balcony.py
@@ -2,12 +2,20 @@ import random as rd
 from buildings.elements.Window import Window
 
 class Balcony:
-    def __init__(self, rdata, length : int, max_width : int, windows : Window):
+    def __init__(self, rdata, max_width : int, windows : Window):
         self.rdata = rdata
-        self.length = length
         self.max_width = max_width
         self.windows = windows
+        self.length = self.get_len()
+        self.has_multiple = self.has_multiple_balcony()
         
-    def has_multiple_balcony(self):
+    def follow_window(self) -> bool:
+        pass
+        
+        
+    def has_multiple_balcony(self) -> bool:
         if self.max_width < self.rdata["balcony"]["multiple"]["min_width"]: return False
-        return self.rdata["balcony"]["multiple"]["proba"] >= rd.random()
\ No newline at end of file
+        return self.rdata["balcony"]["multiple"]["proba"] >= rd.random()
+    
+    def get_len(self) -> int:
+        return rd.randint(self.rdata["balcony"]["size"]["min_len"], self.rdata["balcony"]["size"]["max_len"])
\ No newline at end of file
diff --git a/buildings/elements/Glass.py b/buildings/elements/Glass.py
new file mode 100644
index 0000000..b7e1be3
--- /dev/null
+++ b/buildings/elements/Glass.py
@@ -0,0 +1,22 @@
+from gdpc import Editor
+from buildings.geometry.Vertice import Vertice
+
+class Glass:
+    def __init__(self, x1 : int, x2 : int, group1 : list[Vertice], group2 : list[Vertice] = None):
+        self.x1, self.x2 = x1, x2
+        self.group1, self.group2 = group1, group2
+        
+        
+    def build(self, editor : Editor, material1 : str, material2 : str):
+        for elt in self.group1:
+            elt.fill(editor, material1)
+        if self.group2 is None: return
+        for elt in self.group2:
+            elt.fill(editor, material2)
+            
+    def reset_groups(self):
+        self.group1, self.group2 = [], []
+        
+    def get_len(self):
+        return self.x2 - self.x1 + 1
+        
\ No newline at end of file
diff --git a/buildings/elements/Window.py b/buildings/elements/Window.py
index 4d211da..6719db7 100644
--- a/buildings/elements/Window.py
+++ b/buildings/elements/Window.py
@@ -5,83 +5,31 @@ from utils.Enums import COLLUMN_STYLE, BORDER_RADIUS
 from utils.functions import *
 from buildings.geometry.Point import Point
 from buildings.geometry.Vertice import Vertice
+from buildings.elements.Glass import Glass
 
 class Window:
-    def __init__(self, rdata, max_width : int, max_height : int):
+    def __init__(self, rdata, max_width : int, max_height : int, facade_len : int, facade_height : int):
         self.rdata = rdata
         self.width, self.height = self.get_size(max_width, max_height)
         self.is_grounded = self.is_grounded()
-        self.has_multiple_windows = self.has_multiple_windows()
         self.is_alternate = self.is_alternate()
-        self.has_vertical_crossbar, self.has_horizontal_crossbar = self.has_crossbars()
         self.border_radius = self.border_radius()
-        self.padding = 0
+        self.has_multiple = self.has_multiple_windows()
+        self.has_vertical_crossbar, self.has_horizontal_crossbar = self.has_crossbars()
+        self.padding, self.ypadding = self.get_padding(facade_len, facade_height)
+        self.windows = self.get_windows()
         self.editor, self.materials = None,None
         
-    def build(self, editor : Editor, facade_len : int, facade_height : int, materials : list[str]):
+    def build(self, editor : Editor, materials : list[str]):
         self.editor = editor
         self.materials = materials
-        
-        # correction to avoid asymetry
-        self.padding = (facade_len - self.width)//2
-        self.width = facade_len - self.padding*2
-        
-        if not self.is_grounded: editor.transform @= Transform((0,(facade_height-self.height)//2,0))
-        editor.transform @= Transform((self.padding,0,0))
-        
-        if self.has_multiple_windows: self.build_multiple_windows()
-        else :
-            self.place_glasses(0, self.width)
-        
-    def build_multiple_windows(self):
-        slices = rd.randint(3, self.width//self.rdata["size"]["min_width"])
-        mid = math.ceil(slices/2)
-        windows_count = mid
-        inter_count = slices - windows_count
-        window_size = rd.randint(self.rdata["size"]["min_width"], (self.width-inter_count) // windows_count) 
-        inter_size = (self.width - window_size*windows_count) // inter_count
-        
-        is_even= slices % 2 == 0
-        is_window, gap = True, 0
-        remainder = self.width - (window_size*windows_count + inter_size*inter_count)
-        for i in range(1,slices+1):
-            wsize,isize = window_size, inter_size
-            if is_even and i == mid: wsize, isize = wsize*2, isize*2
-            if i ==  mid: wsize, isize = wsize + remainder, isize + remainder
-            
-            # kepp a spacing between windows, "is revert" is used to keep symetry
-            if is_window:               
-                self.place_glasses(gap, gap+wsize)
-                gap += wsize
-            else : 
-                gap += isize
-                
-            is_window = not is_window
-    
-    def place_glasses(self, x1 : int, x2 : int):
-        len = x2 - x1
-        if self.is_alternate:
-            mid = x1 + len//2
-            
-            is_block, is_even = False, len % 2 == 0
-            for x in range(x1,x2):
-                if is_even and x == mid: is_block = not is_block # to keep symetry
-                id = 1 if not is_block else 2
-                geometry.placeCuboid(self.editor,(x,0,0),(x,self.height,0),Block(self.materials[id]))
-                is_block = not is_block
-            
-        else:
-            geometry.placeCuboid(self.editor,(x1,0,0),(x2-1,self.height,0),Block(self.materials[1]))
-            
-        self.build_crossbars(x1, x2-1, len)
-        if len > 1: self.build_border_radius(x1, x2-1)
-        
-    def get_size(self, max_width : int ,max_height : int) -> tuple[int,int]:
-        return (
-                rd.randint(self.rdata["size"]["min_width"],max_width),
-                rd.randint(self.rdata["size"]["min_height"],max_height)
-            )
-                 
+        with editor.pushTransform(Transform((self.padding,self.ypadding,0))):
+            for g in self.windows:
+                len = g.get_len()
+                g.build(editor, materials[1], materials[2])
+                self.build_crossbars(g.x1, g.x2, len)
+                if len > 1: self.build_border_radius(g.x1, g.x2)
+                         
     def build_crossbars(self, x1 : int, x2 : int, len : int):
         if self.has_vertical_crossbar and self.height >= self.rdata["crossbars"]["min_height_for_vertical_crossbar"]:
             y = self.height//2
@@ -97,10 +45,64 @@ class Window:
         if self.border_radius == BORDER_RADIUS.TOP_AND_BOTTOM:
             self.editor.placeBlock((x1,0,0),Block(self.materials[4], {"facing": "west"}))
             self.editor.placeBlock((x2,0,0),Block(self.materials[4], {"facing": "east"}))
-                          
-    def is_grounded(self):
-        # if the window is grounded or if there is a padding between the window and the ground
-        return self.rdata["grounded"] >= rd.random()
+    
+    
+    def get_windows(self) -> list[Glass]:
+        windows = []
+        if not self.has_multiple: windows = [Glass(0,self.width-1,[self.create_window(0, self.width)])]
+        else: windows = self.get_multiple_windows()
+        if self.is_alternate: self.alternate(windows)
+        
+        return windows
+        
+    def get_multiple_windows(self) -> list[Glass]:
+        windows = []
+        slices = rd.randint(3, self.width//self.rdata["size"]["min_width"])
+        mid = math.ceil(slices/2)
+        windows_count = mid
+        inter_count = slices - windows_count
+        window_size = rd.randint(self.rdata["size"]["min_width"], (self.width-inter_count) // windows_count) 
+        inter_size = (self.width - window_size*windows_count) // inter_count
+        
+        is_even= slices % 2 == 0
+        is_window, gap = True, 0
+        remainder = self.width - (window_size*windows_count + inter_size*inter_count)
+        if windows_count % 2 == 1 and inter_count % 2 == 1: 
+            inter_count -= 1
+            remainder += inter_size
+            is_even = not is_even
+        print(window_size,windows_count,inter_size,inter_count,remainder,self.width,"\n\n")
+        for i in range(1,slices+1):
+            wsize,isize = window_size, inter_size
+            if is_even and i == mid: wsize, isize = wsize*2, isize*2
+            if i ==  mid: wsize, isize = wsize + remainder, isize + remainder
+            
+            if is_window:               
+                windows.append(Glass(gap, gap+wsize-1,[self.create_window(gap, wsize)]))
+                gap += wsize
+            else : 
+                gap += isize
+                
+            is_window = not is_window
+        
+        return windows
+    
+    def alternate(self, windows : list[Glass]):
+        for g in windows:
+            g.reset_groups()
+            len = g.get_len()
+            mid = g.x1 + len//2
+            
+            is_block, is_even = False, len % 2 == 0
+            for x in range(g.x1,g.x2+1):
+                if is_even and x == mid: is_block = not is_block # to keep symetry
+                if is_block: g.group2.append(self.create_window(x))
+                else : g.group1.append(self.create_window(x))
+                is_block = not is_block
+        
+    def create_window(self, x1 : int, length : int = None) -> Vertice:
+        x2 = x1 if length is None else x1 + length -1
+        return Vertice(Point(x1,0,0), Point(x2,self.height,0))
     
     def has_multiple_windows(self):
         if self.width >  self.rdata["size"]["max_width"]: return True
@@ -112,6 +114,27 @@ class Window:
         # if the window alternate between glass_blocks and glass_panes
         return self.rdata["alternate"] >= rd.random()
     
+        
+    def get_size(self, max_width : int ,max_height : int) -> tuple[int,int]:
+        return (
+                rd.randint(self.rdata["size"]["min_width"],max_width),
+                rd.randint(self.rdata["size"]["min_height"],max_height)
+            )
+        
+    def get_padding(self, facade_len : int, facade_height : int) -> tuple[int]:
+        padding,ypadding = 0,0
+        if not self.is_grounded: ypadding = (facade_height - self.height)//2
+        
+        # correction to avoid asymetry
+        padding = (facade_len - self.width)//2
+        self.width = facade_len - padding*2
+        
+        return (padding, ypadding)
+                          
+    def is_grounded(self):
+        # if the window is grounded or if there is a padding between the window and the ground
+        return self.rdata["grounded"] >= rd.random()
+    
     def has_crossbars(self):
         # if the window has crossbars
         data = self.rdata["crossbars"]
diff --git a/buildings/geometry/Rectangle.py b/buildings/geometry/Rectangle.py
index a199982..827ba41 100644
--- a/buildings/geometry/Rectangle.py
+++ b/buildings/geometry/Rectangle.py
@@ -9,8 +9,12 @@ class Rectangle:
     def get_position(self):
         return (self.point1.position, self.point2.position)
     
+    def get_height(self):
+        return self.point2.y - self.point1.y + 1
+    
     def fill(self,editor : Editor, material : str, y : int = None, xpadding : int = 0, zpadding : int = 0):
         if self.point2.x - self.point1.x < 2*xpadding: xpadding = 0
         if self.point2.z - self.point1.z < 2*zpadding: zpadding = 0
+        if y is None: y = self.point2.y
         
         geometry.placeCuboid(editor, (self.point1.x+xpadding, 0, self.point1.z+zpadding), (self.point2.x-xpadding, y, self.point2.z-zpadding), Block(material))
diff --git a/buildings/geometry/Vertice.py b/buildings/geometry/Vertice.py
index c576af5..691f6b5 100644
--- a/buildings/geometry/Vertice.py
+++ b/buildings/geometry/Vertice.py
@@ -3,7 +3,7 @@ from buildings.geometry.Point import Point
 from buildings.geometry.Rectangle import Rectangle
 
 class Vertice(Rectangle):
-    def __init__(self, point1 : Point, point2 : Point, facing : DIRECTION):
+    def __init__(self, point1 : Point, point2 : Point, facing : DIRECTION = None):
         Rectangle.__init__(self, point1, point2)
         self.facing = facing
         
diff --git a/main.py b/main.py
index 9dd676e..55c4506 100644
--- a/main.py
+++ b/main.py
@@ -30,7 +30,7 @@ geometry.placeCuboid(editor, (0,0,-1), (100,15,1), Block("air"))
 x = 0
 facade = []
 for i in range(3,13):
-    facade.append(Facade(random_data["buildings"]["facade"],[Vertice(Point(x,0,0), Point(x+i,0,0), DIRECTION.NORTH)],i,i,COLLUMN_STYLE.NONE))
+    facade.append(Facade(random_data["buildings"]["facade"],[Vertice(Point(x,0,0), Point(x+i,i,0), DIRECTION.NORTH)],COLLUMN_STYLE.NONE))
     x += i+2
 
 for f in facade: