For Manufacturer, reverse engineering is a critical process. When a company has limited knowledge of an engineering part or when there is no two dimensional or 3D model available, reverse engineering can provide design information. Companies can use this technique when replacement parts from an original equipment manufacture are obsolete or unavailable. Reverse engineering also helps optimize product assemblies and provides new and added features. Manufacture often use reverse engineering principles to improve a product. Sometimes, companies use this engineering technique for building digital achieves to create a virtual environment for future references.