This is a dummy section. The html has been edited to illustrate what the inclusion of views of solid models (in the .stl file format commonly used with 3-d printers) might look like.

The views of these models use the X3DOM viewer.

The models themselves were created in OpenSCAD.

A possible form for the XML tags:

<model>
	<source> example.stl </source>
	<downloadable> example_b.stl </downloadable>
	<viewpoint> [100, 50, -75] </viewpoint>
	<description> 
		Words that describe the object.
	</description>
</model>

Here's a virtual model of an icosahedron, with an edge coloring designed to illustrate that its symmetry group is A₅:

The following example(s) illustrate the occasional need for two variants of a model, one showing the final appearance and another that gives a layout for 3d printing. (This is the reason I suggest <source> and <downloadable> tags above.)

A model showing the sorts of solid regions one can integrate over.

This model would be difficult to print, so this version is provided (with the model separated into halves) for printing on an FDM machine. One generally wouldn't want to display a model like this in the text - this is here just to illustrate the need for a <downloadable> tag.

Another potential use for X3D is shown in the next section: ball and stick models of molecules.