proper vararg handling in vector3 constructor

data/scripts/vector3.lua

@@ -94,17 +94,21 @@ function Vector3:__unm()
 end
 
 function Vector3:__call(...)
-  local args = ...
+  local args = {...}
   local nv = {x = 0, y = 0, z = 0}
   setmetatable(nv, Vector3)
-  if type(args) == "number" then
-      nv.x, nv.y, nv.z = args, args, args
-  elseif type(args) == "table" then
-    if args.x ~= nil then
-      nv.x, nv.y, nv.z = args.x, args.y, args.z
+  if type(args[1]) == "number" then
+    if #args == 1 then
+      nv.x, nv.y, nv.z = args[1], args[1], args[1]
     else
       nv.x, nv.y, nv.z = args[1], args[2], args[3]
     end
+  elseif type(args[1]) == "table" then
+    if args[1].x ~= nil then
+      nv.x, nv.y, nv.z = args[1].x, args[1].y, args[1].z
+    else
+      nv.x, nv.y, nv.z = args[1][1], args[1][2], args[1][3]
+    end
   end
   return nv
 end
@@ -115,4 +119,19 @@ end
 
 Vector3.__index = Vector3
 
+
+--------API--------
+function Vector3:length_squared()
+  local x2 = self.x * self.x
+  local y2 = self.y * self.y
+  local z2 = self.z * self.z
+
+  return x2 + y2 + z2
+end
+
+function Vector3:normalized()
+  local length = math.sqrt(self:length_squared())
+  return Vector3(self.x / length, self.y / length, self.z / length)
+end
+-------------------
 return Vector3

data/scripts/vector3test.lua

@@ -1,5 +1,6 @@
 local Vector3 = require "vector3"
 
 local v1 = Vector3{x = 10, y = 20, z = 30}
-local v2 = Vector3(5)
-print(-v2)
+-- local v2 = Vector3(5)
+-- print(v1:normalized())
+print(v1)