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Comparing ray/doc/man/man1/pcomb.1 (file contents):
Revision 1.10 by greg, Mon Feb 5 20:07:17 2018 UTC vs.
Revision 1.11 by greg, Fri May 4 23:56:49 2018 UTC

# Line 42 | Line 42 | but an arbitrary mapping can be assigned with the
42   and
43   .I \-f
44   options.
45 + The variable and function definitions in each
46 + .I \-f source
47 + file are read and compiled from the RADIANCE library where it is found.
48   Negative coefficients and functions are allowed, and
49   .I pcomb
50   will produce color values of zero where they would be negative.
# Line 217 | Line 220 | pcomb \-f myfilt.cal \-x xmax/2 \-y ymax/2 input.hdr >
220   To make a picture of a dot:
221   .IP "" .2i
222   pcomb \-x 100 \-y 100 \-e 'ro=b;go=b;bo=b;b=if((x-50)^2+(y-50)^2\-25^2,0,1)' > dot
223 + .SH ENVIRONMENT
224 + RAYPATH         the directories to check for auxiliary files.
225   .SH AUTHOR
226   Greg Ward
227   .SH "SEE ALSO"

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