Once the photography session is complete all the images are computated and the result is RAW scan asset. That is the first 3D model that is created from the calculation of all photos. This RAW scan usually runs into the tens of millions of polygons and could have some problems, especially around areas with hair. However, when we present our RAW scans here, they have gone through some basic optimization and fix of the geometry. Usually they are exported at 2 milion polygons each.
The Cleaned scan ( or retopologized ) as we call it has a totaly different geometry in quads that is now in the thousands of polygons, not millions. It is also gone through a cleanup of all problem areas. This makes this product a lot easier to use and better looking.