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Comparing ray/doc/man/man1/rtrace.1 (file contents):
Revision 1.4 by greg, Thu Jan 1 19:31:45 2004 UTC vs.
Revision 1.6 by greg, Thu Apr 14 18:04:12 2005 UTC

#	Line 105 | Line 105 | s      surface name
105		.IP
106		m       modifier name
107		.IP
108	+	M       material name
109	+	.IP
110		If the letter 't' appears in
111		.I spec,
112		then the fields following will be printed for every ray traced,
#	Line 113 | Line 115 | Spawned rays are indented one tab for each level.
115		.IP
116		Note that there is no space between this option and its argument.
117		.TP
118	<	.BI -te \ mat
118	>	.BI -te \ mod
119		Append
120	<	.I mat
120	>	.I mod
121		to the trace exclude list,
122		so that it will not be reported by the trace option
123		.I (\-o*t*).
124		Any ray striking an object having
125	<	.I mat
125	>	.I mod
126		as its modifier will not be reported to the standard output with
127		the rest of the rays being traced.
128		This option has no effect unless the 't' option has been given as
129		part of the output specifier.
130	<	Any number of excluded materials may be given, but each
130	>	Any number of excluded modifiers may be given, but each
131		must appear in a separate option.
132		.TP
133	<	.BI -ti \ mat
133	>	.BI -ti \ mod
134		Add
135	<	.I mat
135	>	.I mod
136		to the trace include list,
137		so that it will be considered during the indirect calculation.
138		The program can use either an include list or an exclude
#	Line 139 | Line 141 | list, but not both.
141		.BI -tE \ file
142		Same as
143		.I \-te,
144	<	except read materials to be excluded from
144	>	except read modifiers to be excluded from
145		.I file.
146		The RAYPATH environment variable determines which directories are
147		searched for this file.
148	<	The material names are separated by white space in the file.
148	>	The modifier names are separated by white space in the file.
149		.TP
150		.BI -tI \ file
151		Same as
152		.I \-ti,
153	<	except read materials to be included from
153	>	except read modifiers to be included from
154		.I file.
155		.TP
156		.BR \-i
#	Line 427 | Line 429 | header of the ambient file.
429		.I Getinfo(1)
430		may be used to print out this information.
431		.TP
432	<	.BI -ae \ mat
432	>	.BI -ae \ mod
433		Append
434	<	.I mat
434	>	.I mod
435		to the ambient exclude list,
436		so that it will not be considered during the indirect calculation.
437		This is a hack for speeding the indirect computation by
438		ignoring certain objects.
439		Any object having
440	<	.I mat
440	>	.I mod
441		as its modifier will get the default ambient
442		level rather than a calculated value.
443	<	Any number of excluded materials may be given, but each
443	>	Any number of excluded modifiers may be given, but each
444		must appear in a separate option.
445		.TP
446	<	.BI -ai \ mat
446	>	.BI -ai \ mod
447		Add
448	<	.I mat
448	>	.I mod
449		to the ambient include list,
450		so that it will be considered during the indirect calculation.
451		The program can use either an include list or an exclude
#	Line 452 | Line 454 | list, but not both.
454		.BI -aE \ file
455		Same as
456		.I \-ae,
457	<	except read materials to be excluded from
457	>	except read modifiers to be excluded from
458		.I file.
459		The RAYPATH environment variable determines which directories are
460		searched for this file.
461	<	The material names are separated by white space in the file.
461	>	The modifier names are separated by white space in the file.
462		.TP
463		.BI -aI \ file
464		Same as
465		.I \-ai,
466	<	except read materials to be included from
466	>	except read modifiers to be included from
467		.I file.
468		.TP
469		.BI -me " rext gext bext"
#	Line 592 | Line 594 | cnt 640 480 | rcalc -e 'xr:640;yr:480' -f unusual_view
594		.SH ENVIRONMENT
595		RAYPATH         the directories to check for auxiliary files.
596		.SH FILES
597	<	/usr/tmp/rtXXXXXX               common header information for picture sequence
597	>	/tmp/rtXXXXXX           common header information for picture sequence
598		.SH DIAGNOSTICS
599		If the program terminates from an input related error, the exit status
600		will be 1.

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