Prehistoric carved rock near Dacre Banks, Summerbridge, North Yorkshire. It acquired the name ‘Morphing Stone’ during its discovery on 10/04/2006.
This model is created from 8 stereo pairs captured on 24/04/2006 as part of a recording exercise with English Heritage.
Prior to SfM becoming widely available (2008), stereo photogrammetry was one of the cheaper ways of creating 3D models. However, the methodology was still expensive and out of the reach of most individuals and required a specialist skillset. In this model, you can see the scales, triangle and targets used as control points on each of the stereo pairs. The distances between the object and each shot had to be measured within specific ratios and angles of cameras also had to be maintained between the different stereo pairs. Convergent and divergent imagery avoided. Each recording was meticulously planned otherwise the resultant imagery would prove problematical during processing. The 16 shots used in this model, took 30 minutes to capture.