"Stop Sign" rule applied to painting vehicles, a/c, etc.
After reading a book on figure painting, I was made aware of the use of the "stop sign" rule, where you envision a halo of light above the figure, coming down in a 60 deg. arc, and you highlight and shade the figure according to which surfaces are getting the most direct rays, and which surfaces are shaded from the rays respectively.
I was wondering if anyone here uses the stop sign rule, or do any highlighting and shading of their' aircraft, vehicles or ships.
I'm not talking about applying washes and highlighting raised detail, but the use of different shades of paint for large surfaces that have differing angles with respect to the sun.
Thanks for any replies,
DJ