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Comparing ray/doc/man/man1/rfluxmtx.1 (file contents):
Revision 1.1 by greg, Tue Jul 22 21:55:31 2014 UTC vs.
Revision 1.2 by greg, Mon Jul 28 18:35:40 2014 UTC

# Line 64 | Line 64 | in which case they may be needed to generate RADIANCE
64   .I vwrays(1).
65   The sample count, unless set by the
66   .I \-c
67 < option, defaults to 10000 when a sender file is given, and 1 for pass-through mode.
67 > option, defaults to 10000 when a sender file is given, or to 1 for pass-through mode.
68   .SH VARIABLES
69   The sender and receiver scene files given to
70   .I rfluxmtx
# Line 125 | Line 125 | In normal execution, only a single sender surface is s
125   comprised of any number of subsurfaces, as in a triangle mesh or similar.
126   The surface normal will be computed as the average of all the constituent
127   subsurfaces.
128 < The subsurfaces themselves must be planer, thus only
128 > The subsurfaces themselves must be planar, thus only
129   .I polygon
130   and
131   .I ring
# Line 138 | Line 138 | primitive is supported as well, and multiple receivers
138   matrices) are identified by different modifier names.
139   Though it may be counter-intuitive, receivers are often light sources,
140   since samples end up there in a backwards ray-tracing system such as RADIANCE.
141 + When using local geometry, the overall aperture shape should be close to flat.
142 + Large displacements may give rise to errors due to a convex receiver's
143 + larger profile at low angles of incidence.
144   .PP
145   Rays always eminate from the back side of the sender surface and arrive at the
146   front side of receiver surfaces.

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