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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-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-c\fR \fIrcol2\fR \fIgcol2\fR \fIbcol2\fR] \fIpmap2\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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.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. This can be visualised with |
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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. |
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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. The different |
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photon types are visualised as colour coded spheres according to the |
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following default schema: |
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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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\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). |
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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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.SH OPTIONS |
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Options are effective for the photon map file immediately following on the |
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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. |
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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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.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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reducing \fInspheres\fR and/or \fIradscale\fR. |
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.SH EXAMPLES |
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To visualise the distribution of global and caustic photons superimposed |
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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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Alternatively, the dump may be viewed on its own by piping the output of |
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\fIpmapdump\fR directly into \fIobjview(1)\fR (using the default number of |
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spheres in this example): |
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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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.IP |
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pmapdump zombo.pm | objview |
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