achieve a good variation of light and dark. Now
Illusionist will not render cast shadows, but it will draw
the abscence of light (if you see what I mean!!!) and
thats what we're going to use by positioning the light
source carefully.

   First reduce the World-View angle again and check the
wire frame view until you are satisfied that the picture
is filled suitably. Now position the standard cursor over
the red cross in the centre of the picture and zoom out
twice (all zooms are centered on the cursor). The yellow
cross that you can see is the observer, and the position
of this is crucial when considering light sources. We must
place the light source in a position that will only light
some of the polygons in view. This means positioning the
lamp only just above the height of the surface, and to one
side of the observer (see diagram below).

       ***
       ***
     L


             X

The diagram shows the overhead view, with the asterisks