We carried out a 3D scan of the apse to get a reliable digital copy of the structure. Using a 3D laser scanner, we obtained data on its geometry with pinpoint accuracy. For every point scanned, the laser provided a position in three dimensions (x, y and z) and a reflectance value (intensity of greys). We used that information to generate a large dot matrix on the basis of which we created a virtual copy of the apse, complete with its texture map.
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