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Comparing ray/doc/man/man1/rtrace.1 (file contents):
Revision 1.7 by greg, Tue Apr 19 01:15:06 2005 UTC vs.
Revision 1.8 by greg, Wed May 25 04:44:24 2005 UTC

# Line 109 | Line 109 | m      modifier name
109   .IP
110   M       material name
111   .IP
112 + -       dash (end of trace marker)
113 + .IP
114   If the letter 't' appears in
115   .I spec,
116   then the fields following will be printed for every ray traced,
# Line 116 | Line 118 | not just the final result.
118   If the capital letter 'T' is given instead of 't', then all rays will
119   be reported, including shadow testing rays to light sources.
120   Spawned rays are indented one tab for each level.
121 + The dash marker ('-') is a handy way of differentiating the final ray
122 + value from traced values preceeding it, and should appear immediately
123 + after the
124 + .I \-o
125 + and before the rest of the specification.
126 + E.g.,
127 + .I \-o-vTmW
128   .IP
129   Note that there is no space between this option and its argument.
130   .TP
# Line 138 | Line 147 | must appear in a separate option.
147   Add
148   .I mod
149   to the trace include list,
150 < so that it will be considered during the indirect calculation.
150 > so that it will be reported by the trace option.
151   The program can use either an include list or an exclude
152   list, but not both.
153   .TP

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