![]() This alignment has more than 60% overlap with the clouds on both sides, on the floor surfaces and the pavilions attached to the door. For the union of the other side of the door, the point cloud (taken from the center of the door), was joined, which sees the two sides of the door with its near surroundings (10m maximum). In order to arrive at the level of detail that is required for the model, an overlap of more than 80% between neighboring positions is taken into account in the survey. Starting with an iterative process that looks for the surfaces with a distance of 5cm, then iterating repeating it with shorter distances until 1mm. It is an iterative process that looks for the surfaces that are nearer than a specified distance. For this process, we used a cloud with an overview of the door, as a reference from which to align the rest of the positions in an orderly way for each door side.Tests were performed to scan the door with an optical digitizer, but this option was discarded by the impossibility of scanning the metallic framework of the wings for its fineness, the problems generated when scanning black elements, metallic elements with brightness and also because the nonexistent possibility to scan the internal areas of the sculpture. Given complexity of the steel grid of the wings, the model must be scanned very close to reduce the size of the pulse at a distance and thus reducing the instrumental errors. In addition, a last scan was made in the middle of the door that saw on both sides of it to serve as a connection between the positions. For a good coverage of it and avoid the maximum possible occlusions, 25 positions have been made to collect all the data, distributed on the two sides of the sculpture, one that is inside the garden and another, outside in each side the positions were equidistantly distributed in three rows with different heights: one at ground level near the sculpture, another at half height, and finally, one more distant with a tripod of 3m. The sculpture of the Drac has a geometry so complex and with so many folds, that it is impossible to be scanned from a single position per side.LABORATORI DE MODELIZACIÓ VIRTUAL DE LA CIUTAT Hight resolutionTLS Point Cloud Low resolutionReality Expositionġ4.000.000 polygons750.000.000 Points 2.000.000 polygons Simplification: Quadric Edge Collapse DecimationģD Printing SLS NO Fused deposition modeling FDMįrom Reality to Mesh From Mesh to Reality Meshed with Geomagic Wraps Screened Poisson equation Without filter in dark grayĬomparison of the meshes made with poisson, Manual segmentation in interior of the Drac by side Too subsampled cloud – automatic noise filter Laboratorio de Modelización Virtual de la Ciudad (LMVC), ETSAB, UPCĪccurate alignment (1mm) by comparing and fitting meshesīlue and bark dots have different normal vectors ![]() Juan Corso, Pilar Garcia-Almirall, Adrià Marco High resolution model mesh and 3D printing of the Gaudí’s Porta del Drac ![]()
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