Ray_Path

Ray_Path
struct Ray_Path {
pointer zone; /* list of zones (1origin) cut by the ray */
pointer ds; /* list of path lengths in above zones */
double fi, ff; /* fraction of 1st and last ds, respectively, outside
the specified slimits */
pointer pt1, pt2; /* lists of endpoints of edges cut by ray  ray cuts
directed edge pt1>pt2 from right to left
Like zone, always 1origin values. */
pointer f; /* list of fractions  (f+0.5) is the fraction of
distance from pt1 to pt2 where ray cuts edge */
}
structure, defined at i0/drat.i line 1230
