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Comparing ray/doc/man/man1/mkpmap.1 (file contents):
Revision 1.9 by rschregle, Tue Feb 6 16:02:22 2018 UTC vs.
Revision 1.10 by rschregle, Tue Mar 20 19:53:09 2018 UTC

# Line 101 | Line 101 | may be useful if the resulting photon map size greatly
101   \fInphotons\fR with a very low average reflectance.
102  
103   .IP "\fB\-api \fIxmin ymin zmin xmax ymax zmax\fR"
104 < Define a region of interested within which to store photons exclusively;
104 > Define a region of interest within which to store photons exclusively;
105   photons will only be stored within the volume bounded by the given minimum
106   and maximum coordinates.  Multiple instances of this option may be specified
107   with cumulative effect to define compound regions of interest.  This is
# Line 168 | Line 168 | an error if the specified modifier is not an \fIantima
168   .IP "\fB\-apS \fImodfile\fR"
169   Read virtual receiver surface modifiers from the file \fImodfile\fR as a more
170   convenient alternative to multiple instances of \fB\-aps\fR.
171 +
172 + .IP "\fB\-ae \fImod\fR"
173 + Add \fImod\fR to the ambient exclude list, so that it will be ignored by the
174 + photon map.  Objects having \fImod\fR as their modifier will not have
175 + photons deposited on them.  Multiple modifiers may be given, each as separate
176 + instances of this option.
177 + .IP
178 + \fBWARNING: this is an optimisation option for advanced users and may yield
179 + biased results. It may also significantly increase photon distribution
180 + times. Use with caution!\fR
181 +
182 + .IP "\fB\-aE \fIfile\fR"
183 + Same as \fI-ae\fR, except modifiers to be exluded are read from \fIfile\fR,
184 + separated by whitespace.  The RAYPATH environment variable determines which
185 + directories are searched for this file.
186 +
187 + .IP "\fB\-ai \fImod\fR"
188 + Add \fImod\fR to the ambient include list, so that it will contribute to the
189 + photon map. Only objects having \fImod\fR as their modifier will have
190 + photons deposited on them. Multiple modifiers may be given, each as separate
191 + instances of this option. Note that the ambient include and exclude options
192 + are mutually exclusive.
193 + .IP
194 + \fBWARNING: this is an optimisation option for advanced users and may yield
195 + biased results. It may also significantly increase photon distribution
196 + times. Use with caution!\fR
197 +
198 + .IP "\fB\-aI \fIfile\fR"
199 + Same as \fI-ai\fR, except modifiers to be included are read from \fIfile\fR,
200 + separated by whitespace. The RAYPATH environment variable determines which
201 + directories are searched for this file.
202  
203   .IP "\fB\-bv\fR[\fB+\fR|\fB-\fR]"
204   Toggles backface visibility; enabling this causes photons to be stored and

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