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Comparing ray/doc/man/man1/rfluxmtx.1 (file contents):
Revision 1.7 by greg, Thu Mar 12 18:24:11 2015 UTC vs.
Revision 1.10 by greg, Fri Dec 4 22:16:18 2015 UTC

# Line 91 | Line 91 | The other methods below require a full hemispherical s
91   .TP
92   .BI h =kf
93   Divide the hemisphere using the LBNL/Klems "full" sampling basis.
94 + (Use "h=-kf" for left-handed coordinates.)
95   .TP
96   .BI h =kh
97   Divide the hemisphere using the LBNL/Klems "half" sampling basis.
98 + (Use "h=-kh" for left-handed coordinates.)
99   .TP
100   .BI h =kq
101   Divide the hemisphere using the LBNL/Klems "quarter" sampling basis.
102 + (Use "h=-kq" for left-handed coordinates.)
103   .TP
104   .BI h =rN
105   Divide the hemisphere using Reinhart's substructuring of the Tregenza
# Line 106 | Line 109 | divisions in each dimension.
109   If it is not given,
110   .I N
111   defaults to 1, which is just the Tregenza sky.
112 + (Use "h=-rN" for left-handed coordinates.)
113   .TP
114   .BI h =scN
115   Subdivide the hemisphere using the Shirley-Chiu square-to-disk mapping with an
116   .I NxN
117   grid over the square.
118 + (Use "h=-scN" for left-handed coordinates.)
119   .TP
120   .BI u =[-]{X|Y|Z|ux,uy,uz}
121   Orient the "up" direction for the hemisphere using the indicated axis or direction
122   vector.
123   .TP
124 < .BI o =output.mtx
125 < Send the matrix data for this receiver to the indicated output file.
124 > .BI o =output_spec
125 > Send the matrix data for this receiver to the indicated file or command.
126 > Single or double quotes may be used to contain strings with spaces, and
127 > commands must begin with an exclamation mark ('!').
128   The file format will be determined by the command-line
129   .I \-fio
130   option and will include an information header unless the
# Line 140 | Line 147 | In the receiver file, the
147   .I source
148   primitive is supported as well, and multiple receivers (and multiple output
149   matrices) may be identified by different modifier names.
150 < (Make sure that surfaces using the same modifier are grouped together.)\0
150 > (Make sure that surfaces using the same modifier are grouped together,
151 > and that the modifiers are unique and not used elsewhere in the
152 > scene description.)\0
153   Though it may be counter-intuitive, receivers are often light sources,
154   since samples end up there in a backwards ray-tracing system such as RADIANCE.
155   When using local geometry, the overall aperture shape should be close to flat.

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