Reverse Engineering is a technique used to 3D scan an object to achieve an accurate model without the timely constraints of measuring and modeling. 3D scanning uses a high resolution camera and plots the surface of an object into a cloud based mesh. This mech is then used to create a 3D surface or parametric model. 

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3D scanning is used when: 

- 3d scan data is modeled “design intent” as a parametric model that can be edited in the tree     to create improvements to an existing design using the scan data as a guide.

- New product development.

- Used for new products that require an accurate model of an existing product or part.

- Quality Control