A control circuit accesses a memory having stored therein data for a three-dimensional model in a first file format (such as, for example, an OBJ file format). The control circuit correlates components of the three-dimensional model in the first file format to corresponding codes, and then expresses the three-dimensional model as data for the three-dimensional model in a second file format (such as, for example, an RVT file format) that is different from the first file format as a function of the aforementioned corresponding codes.