The Bivariate Square
Which isosurfaces look the most interesting, and how did you
The only isosurfaces that were interesting were the bone and
the skin isosurfaces. They were found at the data values corresponding
to 70 and 25 for bone and skin respectively. I found them by trial and
error. First I thought that a slider could be more like a
scientist's solution but being an engineer I went for the
efficient way rather than the elegant way, which gave me the result in
a couple of minutes.
how the two values (norm and angle) relate to the shape of the iso
The norm corresponds to the amount of curvature.
So norm will be zero for flat surfaces and it will have a high value
for cup or cap. The angle corresponds to the nature of the
curvature, the value of the angle changes with the type of the
curvature, viz, cup, ridge, saddle, valley, cap etc.
What do you think works best, or what are the benefits of
None of them is a clear winner, because it really boils down to
what we are looking for. Though for this data set I feel that norm was
more appropriate than the angle, because the angle coloring produced a
funky looking image with lots of spots. It was a melee of colors rather
than any useful information. Talking of benefits, norm coloring
differentiated the flat surfaces from the curved surfaces and the angle
coloring helped us distinguish between the various types of curves.
4. What does the color map key say about the curvature at each
The color map key clearly indicates that the
absence of saturation dominates the arena where the surface is flat. In
other words, the saturation value of zero in the surfaces where norm is
zero will make those flat surfaces look white, because the
absence of saturation will override any Hue information present.