You will get 3D CAD Model from 3d scanned data, images, sketches or drawings.
Existing Designs can be modified and a completely new design can be made within the constraints of 3D scanned data.
I use SolidWorks, Geomagic Design X and Meshmixer for Reverse Engineering and CAD conversion services.
Being a Mechanical Engineer with experience of 7 years in CAD-CAM-CAE and Reverse Engineering field, I consider myself an Expert.