diff --git a/lib/cyberarm_engine/common.rb b/lib/cyberarm_engine/common.rb
index 0ac664b..cd8324f 100644
--- a/lib/cyberarm_engine/common.rb
+++ b/lib/cyberarm_engine/common.rb
@@ -48,6 +48,12 @@ module CyberarmEngine
       end
     end
 
+    def opacity(color, ratio = 1.0)
+      alpha = 255 * ratio
+
+      return Gosu::Color.rgba(color.red, color.green, color.blue, alpha)
+    end
+
     def get_asset(path, hash, klass)
       asset = nil
       hash.detect do |_asset, instance|
diff --git a/lib/cyberarm_engine/lib/bounding_box.rb b/lib/cyberarm_engine/lib/bounding_box.rb
index 954954f..83cd68e 100644
--- a/lib/cyberarm_engine/lib/bounding_box.rb
+++ b/lib/cyberarm_engine/lib/bounding_box.rb
@@ -2,9 +2,23 @@ module CyberarmEngine
   class BoundingBox
     attr_accessor :min, :max
 
-    def initialize(minx = 0, miny = 0, minz = 0, maxx = 0, maxy = 0, maxz = 0)
-      @min = Vector.new(minx, miny, minz)
-      @max = Vector.new(maxx, maxy, maxz)
+    def initialize(*args)
+      case args.size
+      when 0
+        @min = Vector.new(0, 0, 0)
+        @max = Vector.new(0, 0, 0)
+      when 2
+        @min = args.first.clone
+        @max = args.last.clone
+      when 4
+        @min = Vector.new(args[0], args[1], 0)
+        @max = Vector.new(args[2], args[3], 0)
+      when 6
+        @min = Vector.new(args[0], args[1], args[2])
+        @max = Vector.new(args[3], args[4], args[5])
+      else
+        raise "Invalid number of arguments! Got: #{args.size}, expected: 0, 2, 4, or 6."
+      end
     end
 
     def ==(other)
diff --git a/lib/cyberarm_engine/lib/vector.rb b/lib/cyberarm_engine/lib/vector.rb
index 0e46ecd..77a2fc8 100644
--- a/lib/cyberarm_engine/lib/vector.rb
+++ b/lib/cyberarm_engine/lib/vector.rb
@@ -31,7 +31,7 @@ module CyberarmEngine
     end
 
     # Performs math operation, excluding @weight
-    def operator(function, other)
+    private def operator(function, other)
       if other.is_a?(Numeric)
         Vector.new(
           @x.send(:"#{function}", other),