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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 1.8 by greg, Fri Mar 27 18:58:06 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

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