**2.3 Universal 3D Interface**
Visualization includes the notion of pluralism and perspectivism since there is an explicit attempt at

* representing* one, often textual (i.e. mathematical), description in terms of a graphical one [

Fis03 ].

The standard ECMA-363

*Universal 3D File Format (U3D)* [

Ecma363 ] defines the structures for storing 3D models. An interface, implemented by the author in Java, does support a subset of U3D for storing 3D scenes, created with the graphics library described in Section

2.12.

With the help of the LaTeX "movie15" package multimedia content, like movies, sound and objects described with U3D, can be embedded in PDF documents, according to the Adobe PDF specification version 1.6. With appropriate software, i.e. the Acrobat Reader version ≥ 8, such objects are displayed in 3D. This enables a high quality representation of textual and graphical content.