A decorated Othostat (L2) is contained within the left hand side of the Mound of the Hostages passage tomb (Duma na nGiall) on the Hill of Tara, dating to 3000 BC. 




Technical Details

This artefact is not recorded within the SMR

Close range Scanning: Next Engine 3D Laser Scanner was utilised to generate resolution models of surfaces with small scale detail. The Next Engine uses MultiStripe Laser Triangulation (MLT) technology.

  • Source – Twin arrays of four, Class 1M, 10 mW solid state lasers with custom optics 650 nm
  • Sensor – Twin 3.0 Megapixel CMOS image sensors
  • Photo Surface – Optically synchronous 7-color surface capture for precision-locked geometry correlation
  • Photo Lighting Built-in spatially diverse white-light illuminators with triphosphor, wide color gamut
  • Object Size – No preset limit. Objects larger than field can be assembled with supplied software
  • Field Size – 5.1″ x 3.8″ (Macro) and 13.5″ x 10.1″ (Wide). HD PRO Extended Mode 22.5″ x 16.75″
  • Resolution – 3D point density on target surface is 400 DPI in Macro Mode and 150 DPI in Wide Mode. Texture Density – 400 DPI on target surfaces is 400 DPI in Macro Mode and 150 DPI in Wide Mode
  • Dimensional Accuracy±0.005″ in Macro Mode and ±0.015″ in Wide Mode

Post-processing was completed in Geomagic Studio 2012 software: individual scans are edited, aligned, before a final surface is generated using global registration, fusion, and a small objects filter algorithm.. For dissemination purposes a 3D version of the model was generated using simplification, retopologisation and texturing processes utilising Autodesk Mudbox and 3DS Max.

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