# A Methodical Approach to 3D Scanning of Heritage Objects Being under Continuous Display
## 4 Materials and Methods
### Description of the \"3 DScaMOTO\" Methodology  
This section introduces a methodical approach for 3D scanning of small- and medium-sized objects under continuous display. It was called \"3 DScaMOTO\", which means \"**3D Scan**ning **M** Methodology in the **O**pen for **T**ourists **O**bjects\". See Table 1 for details on particular stages and their outcomes. Groups A, B, C from the table refer to object types characterized in Section 4.1. The methodology is not limited exclusively to museums but is valid for all heritage sites that are open for tourist traffic and for objects of dimensions that are within the capabilities of structured-light 3D scanners. The initial stage (number 1--Planning) of the methodology covers the preliminary steps before actual 3D scanning. The cultural heritage site (which can be a museum, a historical place or any other site where heritage objects are placed) has to be examined and objects to be scanned have to be chosen. Once the list of objects is created the team of specialists, together with representatives of the site authorities, assign the objects to the A, B, C, and D groups. In the case when some objects are assigned to the A group, the place for the future ad hoc scanning studio is chosen. The requirements for media (e.g. availability of electric current) are agreed according to each group of objects. At this stage the list of chosen objects is reconsidered taking into account the media limitations, constraints imposed by the site authorities and the feasibility assessment of the scanning. The result is the final, approved list of objects. The list is then rearranged according to the planned order of scanning and the naming convention is chosen so that thematic groups can be easily distinguished. Onsite replanning takes place just before the scanning session. The agreed conditions are checked, and countermeasures are implemented if any problems arise. A verified scanning sequence plan is created, taking into account any changes in the sequence forced by the situation (e.g., the need to temporarily restore tourist traffic). After that, the 2 nd stage can be initiated. The 2 nd stage is entirely about the proper 3D scanning execution. It is the last stage that has to be carried out at a heritage site--further stages might be executed in convenient time and place. If there are any type A objects on the list, the ad hoc studio is set-up to provide the best possible environment for scanning. The 3D scanning procedure is executed slightly differently, depending on the type of object being scanned. For type A objects, 3D scanning is carried out in the following sequence: transferring the object to the scanning station in the ad hoc studio (carried out by heritage site staff), selection of parameters, actual scanning, initial check of the results (if there are problems, scanning of the relevant fragments is repeated), collection of additional data about the scanned object (photographic and descriptive documentation), returning the object to the exhibition site (again carried out by heritage site staff). In the case of type B objects, the 3D scanning procedure begins with preparation of the exhibition site (e.g. removing obstacles and setting additional lighting). The scope of the exhibition site modification depends on the decision of heritage site staff. Permission has to be obtained each time for each modification. Then, the object is 3D scanned, taking into account the constraints of a given place. The rest of the procedure is analogous as in the case of type A objects. Results should undergo preliminary checking--problematic placesmight be scanned again if necessary. When the scanning process is completed, the object's exhibition site has to be restored to its normal condition. \begin{table}
\begin{tabular}{p{142.3 pt} p{142.3 pt} p{142.3 pt}} \hline \hline
**Stage Name** & **Substages** & **Results** \\ \hline  & 1.1. Strategic planning & 1.1.1. Getting to know the site, objects and exhibitions & 1.1.2.