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SLD
Four Perspective Views
of the 1988 District
Elections Scottish
Voting Composition.
Each small tetrahedron represents
the four party position of a ward,
its size is in proportion to the
electorate, facets coloured by
the party of the apex opposite.
SNP
SNP
Con
Lab
SNP
SLD
SLD
Lab
Con
SLD
Lab
Con
The tetrahedron is
always lit from the
front - towards
the SLD apex.
Lab
Con
SNP
Figure 9.17 Colour can be a useful cue in seeing inside three-dimensional struc-
tures. Here the tetrahedrons representing the wards are shaded by the colour of
the party on their facet opposite the party's apex. The view is lit towards the SLD
(Liberal) apex. The perspective projection produces greater magnification of near
wards. It is best to spin these types of image on a computer (or other) screen.
Note that parts of these images appear to be at especially low resolution because
the algorithms used to colour each triangular facet of the tetrahedra do not map
colour well onto large square pixels.
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