Polygonal glyphs can have many different geometries. The glyph itself
is a polygon or a polygonal object in 2 or 3 dimensions. Certain characteristics of the
glyph are data-driven (such as size, color, orientation, etc.).
Below we see an example of a polygonal glyph visualization.
At each point in the volume, a sphere is placed. The size of the sphere is determined
by a scalar value at that point.
This picture was obtained from a paper submitted
to the Vis '97 conference by Richard Resnick and Matt Ward.