CLipka's Radiosity Voodoo recommends that pretrace_start be a power of 2
multiple of pretrace_end, and that pretrace_end translate to one pixel.
Calculating the pixel size is easy enough, but deriving a good pretrace_start
from that over various image sizes requires real math, so I incorporated a
formula into one of my include files so I wouldn't have to figure it out each
time.

Last night, I decided to extract this into a stand-alone macro.  Breathe easy;
it allows you to ease up on the pretrace_end recommendation.  I hope you find it
useful.

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