PSI - Issue 29

Nicola Cavalagli et al. / Procedia Structural Integrity 29 (2020) 165–174 Cavalagli et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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purposes, the 3D point cloud provides significant information about cracks and lack of material, in particular about their position and linear and/or volumetric dimensions. To measure the volume of the lackingmaterial, the damaged areas boundaries were manually extracted and random points were generated to fill the space. Fina lly, a triangular mesh was generated for the calculation of the 3Dvolumes. The high resolution of the point cloud allows carryingout a detailed damage mapping in terms of loca lizationof cracks and micro-cracks, areas of masonry wa lls affected by significant erosion of mortar joints and local lack of blocks. As an example, Figure 5 shows a comparison betweena photo image (Fig. 5(a)) and a viewof the texturized 3Dmodel (Fig. 5(b)) of the samedegradedarea, in whicha low-thick crack (window1) anda lackof stone(window2) are observed.