Time for action - changing the teleporter entity to execute the C++ code

1. First, we need to change the lua script. We want to change the function Teleporter:OnUsed to call our C++ function instead of doing the calculation in Lua.

2. This is pretty easy. Change the function as shown below:

   function Teleporter:OnUsed(user)
     --check „user" being valid
     if (not user) then
       return 0;
     end
     --compute target position from current position + teleport direction
     local vCurPos = {};
     user:GetWorldPos(vCurPos);
     local vTargetDir = {}; --assign a temp vector as targetDir „type"
     vTargetDir.x = self.Properties.teleportDirX;
     vTargetDir.y = self.Properties.teleportDirY;
     vTargetDir.z = self.Properties.teleportDirZ;
     local vTargetPos = vecAdd(vCurPos, vTargetDir);
     --call the scriptbind function
     user.actor:TeleportTo(vTargetPos);
   end

3. Save your changes of Teleporter.lua.

4. With the use of user.actor:<function>, we can call all the Scriptbind functions that are implemented in ScriptBind_Actor...