| 1 |
greg |
1.1 |
.\" RCSid "$Id: pmapdump.1,v 1.6 2015/01/13 17:29:13 taschreg Exp taschreg $" |
| 2 |
|
|
.TH PMAPDUMP 1 "$Date: 2015/01/13 17:29:13 $ $Revision: 1.6 $" 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] \fIpmap1\fR |
| 9 |
|
|
[\fB-n\fR \fInspheres2\fR] [\fB-r\fR \fIradscale2\fR] \fIpmap2\fR ... |
| 10 |
|
|
|
| 11 |
|
|
.SH DESCRIPTION |
| 12 |
|
|
\fIpmapdump\fR takes one or more photon map files generated with |
| 13 |
|
|
\fImkpmap(1)\fR as input and sends a RADIANCE scene description of their |
| 14 |
|
|
photon distributions to the standard output. This can be visualised with |
| 15 |
|
|
e.g. \fIobjview(1)\fR, \fIrpict(1)\fR, or \fIrvu(1)\fR to assess the |
| 16 |
|
|
location and local density of photons in relation to the scene geometry. |
| 17 |
|
|
.PP |
| 18 |
|
|
An arbitrary number of photon maps can be specified on the command line and |
| 19 |
|
|
the respective photon type is determined automagically. The different |
| 20 |
|
|
photon types are visualised as colour coded spheres according to the |
| 21 |
|
|
following schema: |
| 22 |
|
|
.IP |
| 23 |
|
|
\fIBlue\fR: global photons |
| 24 |
|
|
.br |
| 25 |
|
|
\fICyan\fR: precomputed global photons |
| 26 |
|
|
.br |
| 27 |
|
|
\fIRed\fR: caustic photons |
| 28 |
|
|
.br |
| 29 |
|
|
\fIGreen\fR: volume photons |
| 30 |
|
|
.br |
| 31 |
|
|
\fIMagenta\fR: direct photons |
| 32 |
|
|
.br |
| 33 |
|
|
\fIYellow\fR: contribution photons |
| 34 |
|
|
|
| 35 |
|
|
.SH OPTIONS |
| 36 |
|
|
Options are effective for the photon map file immediately following on the |
| 37 |
|
|
command line, and are reset to their defaults after completion of each dump. |
| 38 |
|
|
As such they may be set individually for each photon map. |
| 39 |
|
|
|
| 40 |
|
|
.IP "\fB-n \fInspheres\fR" |
| 41 |
|
|
Specifies the number of spheres to dump for the next photon map. The dump |
| 42 |
|
|
is performed by random sampling with \fInspheres\fR as target count, hence |
| 43 |
|
|
the number actually output will be approximate. \fINspheres\fR may be |
| 44 |
|
|
followed by a multiplier suffix for convenience, where \fIk\fR = 10^3 and |
| 45 |
|
|
\fIm\fR = 10^6, although the latter may lead to problems when processing the |
| 46 |
|
|
output geometry with \fIoconv(1)\fR. The default number of spheres is 10k. |
| 47 |
|
|
|
| 48 |
|
|
.IP "\fB-r \fIradscale\fR" |
| 49 |
|
|
Specifies a relative scale factor \fIradscale\fR for the sphere radius. The |
| 50 |
|
|
sphere radius is determined automatically from an estimated average distance |
| 51 |
|
|
between spheres so as to reduce clustering, assuming a uniform distribution. |
| 52 |
|
|
In cases where the distribution is substantially nonuniform (e.g. highly |
| 53 |
|
|
localised caustics) the radius can be manually corrected with this option. |
| 54 |
|
|
The default value is 1.0. |
| 55 |
|
|
|
| 56 |
|
|
.SH NOTES |
| 57 |
|
|
The output may contain many overlapping spheres in areas with high photon |
| 58 |
|
|
density, particularly in caustics. This results in inefficient and slow |
| 59 |
|
|
octree generation with \fIoconv(1)\fR. Generally this can be improved by |
| 60 |
|
|
reducing \fInspheres\fR and/or \fIradscale\fR. |
| 61 |
|
|
|
| 62 |
|
|
.SH EXAMPLES |
| 63 |
|
|
To visualise the distribution of global and caustic photons superimposed |
| 64 |
|
|
on the scene geometry with 5000 and 10000 spheres, respectively: |
| 65 |
|
|
.IP |
| 66 |
|
|
pmapdump -n 5k global.pm -n 10k caustic.pm | |
| 67 |
|
|
oconv - scene.rad > scene_pmdump.oct |
| 68 |
|
|
.PP |
| 69 |
|
|
Alternatively, the dump may be viewed on its own by piping the output of |
| 70 |
|
|
\fIpmapdump\fR directly into \fIobjview(1)\fR (using the default number of |
| 71 |
|
|
spheres in this example): |
| 72 |
|
|
.IP |
| 73 |
|
|
pmapdump zombo.pm | objview |
| 74 |
|
|
|
| 75 |
|
|
.SH AUTHOR |
| 76 |
|
|
Roland Schregle (roland.schregle@{hslu.ch,gmail.com}) |
| 77 |
|
|
|
| 78 |
|
|
.SH COPYRIGHT |
| 79 |
|
|
(c) Fraunhofer Institute for Solar Energy Systems, Lucerne University of |
| 80 |
|
|
Applied Sciences and Arts. |
| 81 |
|
|
|
| 82 |
|
|
.SH ACKNOWLEDGEMENT |
| 83 |
|
|
Development of the RADIANCE photon mapping extension was sponsored by the |
| 84 |
|
|
German Research Foundation (DFG) and the Swiss National Science Foundation |
| 85 |
|
|
(SNF). |
| 86 |
|
|
|
| 87 |
|
|
.SH "SEE ALSO" |
| 88 |
|
|
mkpmap(1), objview(1), oconv(1), rpict(1), rvu(1), |
| 89 |
|
|
\fIThe RADIANCE Photon Map Manual\fR |
| 90 |
|
|
|
