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.\" RCSid "$Id: pmapdump.1,v 1.3 2018/11/21 19:42:20 rschregle Exp $"
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.TH PMAPDUMP 1 "$Date: 2018/11/21 19:42:20 $ $Revision: 1.3 $" RADIANCE
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.SH NAME
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pmapdump - generate RADIANCE scene description of photon map distribution
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.SH SYNOPSIS
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pmapdump [\fB-n\fR \fInspheres1\fR] [\fB-r\fR \fIradscale1\fR]
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[\fB-f\fR | \fB-c\fR \fIrcol1\fR \fIgcol1\fR \fIbcol1\fR] \fIpmap1\fR
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[\fB-n\fR \fInspheres2\fR] [\fB-r\fR \fIradscale2\fR]
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[\fB-f\fR | \fB-c\fR \fIrcol2\fR \fIgcol2\fR \fIbcol2\fR] \fIpmap2\fR
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...
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greg |
1.1 |
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.SH DESCRIPTION
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\fIpmapdump\fR takes one or more photon map files generated with
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\fImkpmap(1)\fR as input and sends a RADIANCE scene description of their
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photon distributions to the standard output. Photons are represented as
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spheres of material type \fIglow\fR. These can be visualised with
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e.g. \fIobjview(1)\fR, \fIrpict(1)\fR, or \fIrvu(1)\fR to assess the
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location and local density of photons in relation to the scene geometry. No
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additional light sources are necessary, as the spheres representing the
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photons are self-luminous.
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.PP
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An arbitrary number of photon maps can be specified on the command line and
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the respective photon type is determined automagically. Per default, the
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different photon types are visualised as colour coded spheres according to
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the following default schema:
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.IP
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\fIBlue\fR: global photons
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.br
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\fICyan\fR: precomputed global photons
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.br
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\fIRed\fR: caustic photons
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.br
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\fIGreen\fR: volume photons
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.br
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\fIMagenta\fR: direct photons
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.br
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\fIYellow\fR: contribution photons
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.PP
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These colours can be overridden for individual photon maps with the \fB-c\fR
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option (see below). Alternatively, photons can be individually coloured
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according to their actual RGB flux with the \fB-f\fR option (see below);
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while this makes it difficult to discern photon types, it can be used to
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quantitatively analyse colour bleeding effects.
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greg |
1.1 |
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.SH OPTIONS
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Options are effective for the photon map file immediately following on the
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command line, and are reset to their defaults after completion of each dump.
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As such they may be set individually for each photon map.
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.IP "\fB-n \fInspheres\fR"
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Specifies the number of spheres to dump for the next photon map. The dump
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is performed by random sampling with \fInspheres\fR as target count, hence
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the number actually output will be approximate. \fINspheres\fR may be
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followed by a multiplier suffix for convenience, where \fIk\fR = 10^3 and
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\fIm\fR = 10^6, although the latter may lead to problems when processing the
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output geometry with \fIoconv(1)\fR. The default number of spheres is 10k.
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.IP "\fB-r \fIradscale\fR"
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Specifies a relative scale factor \fIradscale\fR for the sphere radius. The
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sphere radius is determined automatically from an estimated average distance
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between spheres so as to reduce clustering, assuming a uniform distribution.
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In cases where the distribution is substantially nonuniform (e.g. highly
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localised caustics) the radius can be manually corrected with this option.
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The default value is 1.0.
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.IP "\fB-c\fR \fIrcol\fR \fIgcol\fR \fIbcol\fR"
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Specifies a custom sphere colour for the next photon map. The colour is
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specified as an RGB triplet, with each component in the range (0..1].
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Without this option, the default colour for the corresponding photon type
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is used. This option is mutually exclusive with \fB-f\fR.
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.IP "\fB-f\fR"
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Boolean switch to colour each sphere according to the corresponding photon's
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RGB flux instead of a constant colour. Note that the resulting colours can
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span several orders of magnitude and may require tone mapping with
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\fIpcond(1)\fR for visualisation. This option is mutually exclusive with
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\fB-c\fR.
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1.2 |
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1.1 |
.SH NOTES
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The output may contain many overlapping spheres in areas with high photon
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density, particularly in caustics. This results in inefficient and slow
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octree generation with \fIoconv(1)\fR. Generally this can be improved by
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reducing \fInspheres\fR and/or \fIradscale\fR.
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.SH EXAMPLES
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Visualise the distribution of global and caustic photons superimposed
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on the scene geometry with 5000 pale red and 10000 pale blue spheres,
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respectively:
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.IP
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pmapdump -n 5k -c 1 0.4 0.4 global.pm -n 10k -c 0.4 0.4 1 caustic.pm |
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oconv - scene.rad > scene_pmdump.oct
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.PP
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Visualise the caustic photon distribution superimposed on the scene geometry
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with 10000 spheres coloured according to the photons' respective RGB flux:
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.IP
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pmapdump -n 10k -f caustic.pm | oconv - scene.rad > scene_pmdump.oct
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.PP
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Dumps may also be viewed on their own by piping the output of \fIpmapdump\fR
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directly into \fIobjview(1)\fR (using the default number of spheres in this
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example):
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greg |
1.1 |
.IP
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pmapdump zombo.pm | objview
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.SH AUTHOR
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Roland Schregle (roland.schregle@{hslu.ch,gmail.com})
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.SH COPYRIGHT
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(c) Fraunhofer Institute for Solar Energy Systems, Lucerne University of
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Applied Sciences and Arts.
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.SH ACKNOWLEDGEMENT
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Development of the RADIANCE photon mapping extension was sponsored by the
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German Research Foundation (DFG) and the Swiss National Science Foundation
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(SNF).
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.SH "SEE ALSO"
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mkpmap(1), objview(1), oconv(1), rpict(1), rvu(1),
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\fIThe RADIANCE Photon Map Manual\fR
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