Time for action - making the teleporter usable

1. In order to make any object intractable, we have to add two functions to our lua code:

   • The function IsUsable

   • The function OnUsed

2. Let's implement these functions. We need to extend the Teleporter.lua script with some more functions:

   --tell the engine that we can interact with this entity
   function Teleporter:IsUsable(user)
     return 1;
   end
   ----------------------------------------
   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);
     --set target position on player entity
     user:SetWorldPos(vTargetPos);
   end

   The function IsUsable...