habitat rupestre.pdf - Società Friulana di Archeologia

INTEGRATED SURVEYING SYSTEMS FOR BURIED ARCHITECTURECRHIMA-CINP projectFig. 6 AutoCAD technical drawings: the issue of represent depth ofunderground spaces.Fig. 7 From the point cloud to the mesh model through automatic process.Modern software for the organization of point clouds and thosefor automatic modelling allow us to reduce posterior density,at the discretion of the operator, if the files are too ‘heavy’ (ininformatic terms). This allows us to carry out, in any case,greatly detailed scans to be modified if needed, in the postproductionphase, in conformity with the output requested.Once the problem of the survey detail in relation to the scaleof the final representation has been assessed, the correct workmethod foresees a choice of methods on how to elaborate thedata in relation to the work that needs to be produced (technicaldesigns, thematic maps, rendering, animation etc). In thecase of buried architecture the complexity of the spaces ishardly suited to being represented solely and exclusively in bidimensionalrepresentations created, employing point clouds,through the use of vector design applications like CAD 4 (Fig.6); on the other hand the usual absence, in these spaces, ofparticularly complex elements, from an architectural point ofview, generally make it possible to create ‘light’ (in informaticterms) point clouds, suited for automatic meshing operationsto be carried out with specific software. (Fig. 7)A similar possibility makes it easy to produce highly reliable- from a metric stand point - tri-dimensional models in a shortperiod of time that can be used for numerous productions andapplications.Should there be a need for technical products in which themetrical aspect is fundamental for making assessments, forinstance on a structural or preservation level, this modelwould be extremely useful, given the detail (in this case werecommend to don’t lower density of point clouds in the postproductionphase).If, however, more attention need be given to the popular aspect,a simplyfied model would suffice, and could take advantageof the possibility of photographic mapping to make thepotential user’s surfing of virtual space hyper-realistic (outstationor web). (Fig. 8-9-10)ConclusionsWe believe that this methodological process, the result of numerousexperiments carried out on the subject, fully meets therequirements of reliability, usability and versatility which anymodern documentation work calls for, in the general view ofcreating vast and storable data banks, useful not only todaybut, eventually, also in the future. 5Fig. 8 From the point cloud to the simplifi ed mesh model in different views in a 3D Interactive Model for a walk-through experience.volumeRicerca_OK_2012-11-15.indd 178 16/11/2012 15:03:08