The meshes used
'mesh1' - a basic mesh demonstrating some overlapping geometry
'flatshead_dungeon' - a reasonably complex mesh with low visibility
'thainesford' - a walled town with buildings and detail objects
The area surrounding the town is also represented and contains a lot of trees and rocks.
There is a lot of visibility between objects on this mesh, making it a very good test for a points-of-visibility solution.
Unobstructed space optimisation
The 'thainesford (optimised)' benchmark points use the 'thainesford' mesh with the unobstructed space optimisation feature turned on. (See this page, in the online documentation, for more information about the unobstructed space optimisation feature.)