Scanning difficulties were as follows:
• The object surface was covered with a dark but slightly glaring paint. This led to noise data increase and hole origin at glaring places. Matte coating should have been applied before scanning in such case.
• The object had smooth forms and small decoratory elements as well. Using a maximal scan area would have not allowed quality scanning of small elements.
• The object possessed a high degree of symmetry, which could have created difficulties during finding correct positions of separate fragments.
• Painting the object and sticking markers to it were unacceptable as the object was a thing of value.
An optimal solution was found as a result. Scanning was done by the VTScanner with scan area 200. The scan area was slightly smaller than the object itself, but this allowed to make quality scans of small decoratory elements, though scan fragment number was increased. The object itself was scanned by portions. Separate fragments were matched by means of an auxiliary element, a black board with chaotically attached markers. In order to increase reliability and convenience, a reference net consisting of board marker coordinates was prepared by the scanner itself. Due to the fact that markers during scanning were identified by the 3d scanner software automatically, fragment matching was done without operator assistance. This significantly simplified the work.
The object was laid on the auxiliary board in several positions with turning it each time around its axis. 7 positions were obtained. In each position scanning was done at angle to the object axis by portions: from bottom to top, then from top to bottom. 6 automatically matched fragments were obtained for each run top-bottom/ bottom-top run.