the coordinates of all relevant points required for
shading computation were translated into a text
file. Once the computing module was executed,
these coordinates were then called to compute the
corresponding positions of the shade based on
Eq.5. Simultaneously, the shaded area was also
computed based on the method of point tracing, in
which Eq (8) and (9) are essentially employed.
Figure 10 shows an example of the results
including a graphical view of the shade pattern and
the value of the shaded area.