fix: upper layers not working (probably)

tree.lua

 -- NUR DURCH 4 TEILBARE ZAHLEN > 20 VERWENDEN!!!
 local leds = {
-    64,
-    56,
-    48,
+    40,
     36,
+    32,
+    28,
+    24,
     20,
+    16,
+    12,
+    8,
+    4
 }
 
 for i = 1, #leds do
     if leds[i] % 4 ~= 0 then
         error("[ledtree] led count per layer must be divisible by 4. Error location: 'leds' table, item "..i..": "..leds[i])
     end
-    if leds[i] < 20 then
-        error("[ledtree] led count per layer must be greater than or qual to 20. Error location: 'leds' table, item "..i..": "..leds[i])
-    end
 end
 
 local height_increment = 3
@@ -38,7 +40,7 @@ local function place_layer(center, breite)
     breite = breite * 2 + 1
     local needles = {}
     local leds = {}
-    local max_offset = math.floor(breite / 2)
+    local max_offset = (breite - 1) / 2
     for y = math.ceil(-height_increment / 2), math.floor(height_increment / 2) do
         for x = -max_offset, max_offset do
             for z = -max_offset, max_offset do
@@ -63,7 +65,7 @@ local function place_leds(led_index, leds)
 end
 
 local function place_tree(pos)
-    local led_index = 0
+    local led_index = 300 - 200
     for index = 1, #leds do
         local l = leds[index]
         local layer_center = vector.new(pos.x, pos.y + index * height_increment - height_increment / 2, pos.z)