diff --git a/koptilnya/common.txt b/koptilnya/common.txt
new file mode 100644
index 0000000..767ef59
--- /dev/null
+++ b/koptilnya/common.txt
@@ -0,0 +1,26 @@
+NULL_ENTITY = entity(0)
+
+function deepcopy(orig)
+    local orig_type = type(orig)
+    local copy
+    if orig_type == 'table' then
+        copy = {}
+        for orig_key, orig_value in next, orig, nil do
+            copy[deepcopy(orig_key)] = deepcopy(orig_value)
+        end
+        setmetatable(copy, deepcopy(getmetatable(orig)))
+    else -- number, string, boolean, etc
+        copy = orig
+    end
+    return copy
+end
+
+function table:merge(table1, table2)
+    local newTable = deepcopy(table1)
+
+    for k, v in pairs(table2) do
+        newTable[k] = v
+    end
+
+    return newTable
+end
diff --git a/koptilnya/libs/render.txt b/koptilnya/libs/render.txt
index be32eff..e933bb3 100644
--- a/koptilnya/libs/render.txt
+++ b/koptilnya/libs/render.txt
@@ -44,16 +44,26 @@ function render.drawArc(x, y, ang, p, rad, seg)
 end
 
 function render.drawFilledCircle(x, y, radius, seg)
-	local cir = {}
+    local cir = {}
 
-	table.insert(cir, { x = x, y = y, u = 0.5, v = 0.5 })
-	for i = 0, seg do
-		local a = math.rad(( i / seg ) * -360)
-		table.insert(cir, { x = x + math.sin( a ) * radius, y = y + math.cos( a ) * radius, u = math.sin( a ) / 2 + 0.5, v = math.cos( a ) / 2 + 0.5 })
-	end
+    table.insert(cir, { x = x, y = y, u = 0.5, v = 0.5 })
+    for i = 0, seg do
+        local a = math.rad(( i / seg ) * -360)
+        table.insert(cir, { x = x + math.sin( a ) * radius, y = y + math.cos( a ) * radius, u = math.sin( a ) / 2 + 0.5, v = math.cos( a ) / 2 + 0.5 })
+    end
 
-	local a = math.rad(0)
-	table.insert(cir, { x = x + math.sin( a ) * radius, y = y + math.cos( a ) * radius, u = math.sin( a ) / 2 + 0.5, v = math.cos( a ) / 2 + 0.5 })
+    local a = math.rad(0)
+    table.insert(cir, { x = x + math.sin( a ) * radius, y = y + math.cos( a ) * radius, u = math.sin( a ) / 2 + 0.5, v = math.cos( a ) / 2 + 0.5 })
 
-	render.drawPoly(cir)
+    render.drawPoly(cir)
+end
+
+function render.drawRotatedSimpleText(x, y, text, ang)    
+    local m = Matrix()
+    m:translate(Vector(x, y, 0 ))
+    m:rotate(Angle(0, ang, 0))
+        
+    render.pushMatrix(m)
+    render.drawSimpleText(0, 0, text)
+    render.popMatrix()
 end
\ No newline at end of file