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We describe here a long-term, interdisciplinary, international partnership involving conservators, archivists, computer scientists, and digital humanists that developed a low-cost pipeline for conserving, digitizing, 3D-reconstructing, and virtually flattening the fire-damaged, buckled parchment, enabling new readings and understanding of the text to be created.For the first time, this article presents a complete overview of the project, detailing the conservation, digital acquisition, and digital reconstruction methods used, resulting in a new transcription and digital edition of the text in time for the 400th anniversary celebrations of the building of Londonderry’s city walls in 2013.
We also introduce a novel quality metric, relating our work to standard best practice in digitization for archival materials, to gauge the effective digitization resolution of our reconstruction approach.
Badly damaged in a fire, the Great Parchment Book was stored under restricted access, unavailable for handling or reading by historians.
Established conservation methods for flattening were unsuitable due to the parchment’s fragility.
So, what is your platform (Windows, Linux, Mac OS)? _______________________________________________ Open SCAD mailing list [hidden email] my_object()module slice(dr=dr)//slice()my_object();//translate([2.5*r,0,0])my_object(); module tile(i=0)tile()my_object();translate([2.5*r,0,0])projection(cut=true)my_object();r=50; dr=4; xmax=30; ymax=20; sp = 1; // spacing between tiles in spreading module my_object() module slice(dr=dr) //slice()my_object(); //translate([2.5*r,0,0])my_object(); module tile(i=0,dx=0,dy=0) // three adjacent layers tile(0)my_object(); translate([0,0,5]) tile(1) my_object(); translate([0,0,10]) tile(2) my_object(); translate([2.5*r,0,0])projection(cut=true)my_object(); Yes almost, I'd say, the task is to slice a 3D-object first into slices as Peter startet.
As those slices are laser cut, each one has to be cut into the cells size of an ordinary grid, with each piece fitting into the cutter's bed. So, second, the grid of every second slice needs an xy-offset of half of the bed size, as shown in the initial drawing. It is the output of, say, some hundreds of DXF, one for each piece. So the scad programm itself will be more or less a function taking some parameters (bed size, material thickness, piece number) and will be called by some (outer) script/program enumerating the pieces.
Standard two-dimensional digitization techniques would not capture the physicality of the text adequately, and existing three-dimensional (3D) scanning methods for documentary material were unsuitable for this particular application.