With the evolution of new technologies, human lifes are getting smarter and easier. Similarly nowadays 3D Modelling Application  technology is evolving and many 3D scanners are now available under reasonable prices with good quality scans. Even now the Apple iPhone has a LiDar scanner which is very convenient and easy to use.

Using a 3D Modelling application on your smartphone or even by proper 3D scanning device you can scan a digital representation of the object or person. The scan has a point cloud with depth and the color etc. This point cloud can be converted to mesh which can be opened in a 3D modeling application.

These scanned 3D models can be consumed by various applications. One of them  is 3D Measure Up which uses a 3D avatar of a human body data to identify landmarks and extract measurements. 

Read More : https://3dmeasureup.com/blog/simple-method-for-slicing-and-segmenting-3d-avatars/