*3.2. 3D Reconstruction and Application Development*

A preliminary stage of the work was the design of the 3D objects that served as content for the MAR application. For this purpose, we used historical references for the reconstruction of archaeological artifacts discovered in Dobrogea, a historical region situated in the southeast part of Romania, enhanced with animated elements. The ruins of a Roman house situated in an archeological site in the center of Constanta, known as Tomis in the past, were photographed and measured in order to create a 3D object. Photogrammetry allowed us to obtain a good representation of the walls, which we used as a base for the house. A 3D model of an ancient Roman house was designed using Autodesk 3D Studio Max software, version 2016 (Autodesk, California, USA) [67] (Figure 3). Local experts from the Museum of Archeology from Constanta provided information regarding the design of the house, more specifically, how the roof and windows should look in order to accurately present a building from that period of time.

**Figure 3.** The 3D Roman house: (**a**) Outdoor view; (**b**) Indoor view.

The virtual 3D character of Ovid included animations and an audio source to play the poem. Visitors used the Lenovo phablet to explore the inside and outside of the Roman house, observe the gestures of Ovid while he recited his own poem, or when he sat at the table writing a poem. If someone passed by or stood next to the virtual character, the device displayed both that person and Ovid on the screen, as in real life.

Ovid's 3D models, as child, adult in Rome, and elder in Tomis, were obtained using MakeHuman, version 1.1.0 [68] and Blender, version 2.77a (Blender Foundation, Amsterdam, Netherlands) [69], which are free, open-source software. They were animated using Adobe Mixamo [70]. The characters were designed based on the historical figure of Ovid. The selected animations corresponded to activities such as walking, sitting, writing, and idle behaviors. These models were integrated in the MAR application using Unity software, version 5.2.5 (Unity Technologies, San Francisco, USA) [71]. In Figure 4 is presented the development process of Ovid3D.

**Figure 4.** Development stages of Ovid3D.
