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Comparing ray/doc/man/man1/rtrace.1 (file contents):
Revision 1.6 by greg, Thu Apr 14 18:04:12 2005 UTC vs.
Revision 1.8 by greg, Wed May 25 04:44:24 2005 UTC

# Line 89 | Line 89 | v      value (radiance)
89   .IP
90   w       weight
91   .IP
92 + W       contribution
93 + .IP
94   l       effective length of ray
95   .IP
96   L       first intersection distance
# Line 107 | 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,
117   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 125 | Line 138 | Any ray striking an object having
138   .I mod
139   as its modifier will not be reported to the standard output with
140   the rest of the rays being traced.
141 < This option has no effect unless the 't' option has been given as
142 < part of the output specifier.
141 > This option has no effect unless either the 't' or 'T'
142 > option has been given as part of the output specifier.
143   Any number of excluded modifiers may be given, but each
144   must appear in a separate option.
145   .TP
# Line 134 | 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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