| 1 |
.\" RCSid "$Id: pmapdump.1,v 1.1 2015/02/24 19:39:26 greg Exp $"
|
| 2 |
.TH PMAPDUMP 1 "$Date: 2015/02/24 19:39:26 $ $Revision: 1.1 $" RADIANCE
|
| 3 |
|
| 4 |
.SH NAME
|
| 5 |
pmapdump - generate RADIANCE scene description of photon map distribution
|
| 6 |
|
| 7 |
.SH SYNOPSIS
|
| 8 |
pmapdump [\fB-n\fR \fInspheres1\fR] [\fB-r\fR \fIradscale1\fR]
|
| 9 |
[\fB-c\fR \fIrcol1\fR \fIgcol1\fR \fIbcol1\fR] \fIpmap1\fR
|
| 10 |
[\fB-n\fR \fInspheres2\fR] [\fB-r\fR \fIradscale2\fR]
|
| 11 |
[\fB-c\fR \fIrcol2\fR \fIgcol2\fR \fIbcol2\fR] \fIpmap2\fR ...
|
| 12 |
|
| 13 |
.SH DESCRIPTION
|
| 14 |
\fIpmapdump\fR takes one or more photon map files generated with
|
| 15 |
\fImkpmap(1)\fR as input and sends a RADIANCE scene description of their
|
| 16 |
photon distributions to the standard output. This can be visualised with
|
| 17 |
e.g. \fIobjview(1)\fR, \fIrpict(1)\fR, or \fIrvu(1)\fR to assess the
|
| 18 |
location and local density of photons in relation to the scene geometry.
|
| 19 |
.PP
|
| 20 |
An arbitrary number of photon maps can be specified on the command line and
|
| 21 |
the respective photon type is determined automagically. The different
|
| 22 |
photon types are visualised as colour coded spheres according to the
|
| 23 |
following default schema:
|
| 24 |
.IP
|
| 25 |
\fIBlue\fR: global photons
|
| 26 |
.br
|
| 27 |
\fICyan\fR: precomputed global photons
|
| 28 |
.br
|
| 29 |
\fIRed\fR: caustic photons
|
| 30 |
.br
|
| 31 |
\fIGreen\fR: volume photons
|
| 32 |
.br
|
| 33 |
\fIMagenta\fR: direct photons
|
| 34 |
.br
|
| 35 |
\fIYellow\fR: contribution photons
|
| 36 |
.PP
|
| 37 |
These colours can be overridden for individual photon maps with the \fB-c\fR
|
| 38 |
option (see below).
|
| 39 |
|
| 40 |
.SH OPTIONS
|
| 41 |
Options are effective for the photon map file immediately following on the
|
| 42 |
command line, and are reset to their defaults after completion of each dump.
|
| 43 |
As such they may be set individually for each photon map.
|
| 44 |
|
| 45 |
.IP "\fB-n \fInspheres\fR"
|
| 46 |
Specifies the number of spheres to dump for the next photon map. The dump
|
| 47 |
is performed by random sampling with \fInspheres\fR as target count, hence
|
| 48 |
the number actually output will be approximate. \fINspheres\fR may be
|
| 49 |
followed by a multiplier suffix for convenience, where \fIk\fR = 10^3 and
|
| 50 |
\fIm\fR = 10^6, although the latter may lead to problems when processing the
|
| 51 |
output geometry with \fIoconv(1)\fR. The default number of spheres is 10k.
|
| 52 |
|
| 53 |
.IP "\fB-r \fIradscale\fR"
|
| 54 |
Specifies a relative scale factor \fIradscale\fR for the sphere radius. The
|
| 55 |
sphere radius is determined automatically from an estimated average distance
|
| 56 |
between spheres so as to reduce clustering, assuming a uniform distribution.
|
| 57 |
In cases where the distribution is substantially nonuniform (e.g. highly
|
| 58 |
localised caustics) the radius can be manually corrected with this option.
|
| 59 |
The default value is 1.0.
|
| 60 |
|
| 61 |
.IP "\fB-c\fR \fIrcol\fR \fIgcol\fR \fIbcol\fR"
|
| 62 |
Specifies a custom sphere colour for the next photon map. The colours is
|
| 63 |
specified as an RGB triplet, with each component in the range (0..1].
|
| 64 |
Without this option, the default colour for the corresponding photon type
|
| 65 |
is used.
|
| 66 |
|
| 67 |
.SH NOTES
|
| 68 |
The output may contain many overlapping spheres in areas with high photon
|
| 69 |
density, particularly in caustics. This results in inefficient and slow
|
| 70 |
octree generation with \fIoconv(1)\fR. Generally this can be improved by
|
| 71 |
reducing \fInspheres\fR and/or \fIradscale\fR.
|
| 72 |
|
| 73 |
.SH EXAMPLES
|
| 74 |
To visualise the distribution of global and caustic photons superimposed
|
| 75 |
on the scene geometry with 5000 pale red and 10000 pale blue spheres,
|
| 76 |
respectively:
|
| 77 |
.IP
|
| 78 |
pmapdump -n 5k -c 1 0.4 0.4 global.pm -n 10k -c 0.4 0.4 1 caustic.pm |
|
| 79 |
oconv - scene.rad > scene_pmdump.oct
|
| 80 |
.PP
|
| 81 |
Alternatively, the dump may be viewed on its own by piping the output of
|
| 82 |
\fIpmapdump\fR directly into \fIobjview(1)\fR (using the default number of
|
| 83 |
spheres in this example):
|
| 84 |
.IP
|
| 85 |
pmapdump zombo.pm | objview
|
| 86 |
|
| 87 |
.SH AUTHOR
|
| 88 |
Roland Schregle (roland.schregle@{hslu.ch,gmail.com})
|
| 89 |
|
| 90 |
.SH COPYRIGHT
|
| 91 |
(c) Fraunhofer Institute for Solar Energy Systems, Lucerne University of
|
| 92 |
Applied Sciences and Arts.
|
| 93 |
|
| 94 |
.SH ACKNOWLEDGEMENT
|
| 95 |
Development of the RADIANCE photon mapping extension was sponsored by the
|
| 96 |
German Research Foundation (DFG) and the Swiss National Science Foundation
|
| 97 |
(SNF).
|
| 98 |
|
| 99 |
.SH "SEE ALSO"
|
| 100 |
mkpmap(1), objview(1), oconv(1), rpict(1), rvu(1),
|
| 101 |
\fIThe RADIANCE Photon Map Manual\fR
|
| 102 |
|
