old_contents: var Incheon = {
      GameEngine: require("./src/GameEngine"),
      ServerEngine: require("./src/ServerEngine"),
      ClientEngine: require("./src/ClientEngine"),
      Synchronizer: require("./src/Synchronizer"),
      GameWorld: require("./src/GameWorld"),
      Point: require("./src/Point"),
      serialize: {
          Serializer: require("./src/serialize/Serializer"),
          Serializable: require("./src/serialize/Serializable"),
          PhysicalObject: require("./src/serialize/PhysicalObject"),
          THREEPhysicalObject: require("./src/serialize/THREEPhysicalObject"),
          DynamicObject: require("./src/serialize/DynamicObject")
      },
      physics: {
          PhysicsEngine: require("./src/physics/PhysicsEngine"),
          SimplePhysicsEngine: require("./src/physics/SimplePhysicsEngine"),
          PhysijsPhysicsEngine: require("./src/physics/PhysijsPhysicsEngine")
      },
      render: {
          Renderer: require("./src/render/Renderer"),
          ThreeRenderer: require("./src/render/ThreeRenderer")
      }
  };
  
  module.exports = Incheon;
  
new_contents: var Incheon = {
      GameEngine: require("./src/GameEngine"),
      ServerEngine: require("./src/ServerEngine"),
      ClientEngine: require("./src/ClientEngine"),
      Synchronizer: require("./src/Synchronizer"),
      GameWorld: require("./src/GameWorld"),
      Point: require("./src/Point"),
      serialize: {
          Serializer: require("./src/serialize/Serializer"),
          Serializable: require("./src/serialize/Serializable"),
          PhysicalObject: require("./src/serialize/PhysicalObject"),
          THREEPhysicalObject: require("./src/serialize/THREEPhysicalObject"),
          DynamicObject: require("./src/serialize/DynamicObject")
      },
      physics: {
          PhysicsEngine: require("./src/physics/PhysicsEngine"),
          SimplePhysicsEngine: require("./src/physics/SimplePhysicsEngine")
          // PhysijsPhysicsEngine: require("./src/physics/PhysijsPhysicsEngine")
      },
      render: {
          Renderer: require("./src/render/Renderer"),
          ThreeRenderer: require("./src/render/ThreeRenderer")
      }
  };
  
  module.exports = Incheon;
  
subject: comment out PhysijsPhysicsEngine