27 February 2013 — Bronze Age axe heads and daggers have been seen for the first time in 3000 years with “sub-millimetre accuracy” in Stone Henge buildings by Bentley Systems’ Pointools technology. Bentley Pointools’ Plane Shading function was used to create a greyscale band 7.5 centimetres wide. This band was moved at 1-millimetre intervals through the data. As it moved, it created a high-quality rendering of the plane shaded image. Depending on the position in relation to a preset camera plane, each point was assigned a greyscale value, allowing very subtle features to be visible. The work was carried out by ArcHeritage, part of the York Archaeological Trust in the United Kingdom, resulting in the discovery of 71 carvings of Bronze Age axes.