If a 3d-scanned object is on the ground, it would be helpful to choose a "half-dome" lighting model for generating the occlusion map.
The occlusion map is a very important feature for delighting the diffuse map,
In a normal (efficient) workflow one isolates the scanned object (region and/or geometry clean-up). However, this means there is no ground geometry for the occlusion map generation.
Of course there are workarounds, but this suggested option would be really useful.