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] |
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.br |
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.B "rpict [ options ] \-defaults" |
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.br |
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.B "rpict \-features [feat1 ..]" |
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.SH DESCRIPTION |
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.I Rpict |
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generates a picture from the RADIANCE scene given in |
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for the options (modified by those options present) |
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are printed with a brief explanation. |
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.PP |
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In the third form, a list of supported features is sent |
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to the standard output, one per line. |
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If additional arguments follow, they are checked for presence in |
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this list. |
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If a feature includes subfeatures, these may be checked as well by |
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specifying: |
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.nf |
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|
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rpict -features FeatName=subfeat1,subfeat2 |
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|
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.fi |
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If any named feature or subfeature is missing, an error is |
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reported and the program returns an error status. |
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If all of the named features are present, a zero status is returned. |
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.PP |
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Most options are followed by one or more arguments, which must be |
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separated from the option and each other by white space. |
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The exceptions to this rule are the |
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Distributed ray-tracing performs anti-aliasing by randomly sampling |
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over pixels. |
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A value of one will randomly distribute samples over full |
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pixels. |
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pixels, and is not really recommended due to the tendency of |
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samples to (nearly) coincide. |
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A value of zero samples pixel centers only. |
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A value between zero and one is usually best |
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for low-resolution images. |
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A value around 0.5-0.8 is typical. |
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.TP |
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.BI -pm \ frac |
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Set the pixel motion blur to |
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.I \-pd |
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option, to avoid the ghosting effect of too few samples. |
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.TP |
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.BI -pc " xr yr xg yg xb yb xw yw" |
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Use the specified chromaticity pairs for output primaries and white |
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point rather than the standard RGB color space. |
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.TP |
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.BR \-pRGB |
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Output standard RGB values (the default). |
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.TP |
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.BR \-pXYZ |
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Output standard CIE XYZ tristimulus values rather than RGB. |
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.TP |
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.BI -f \ source |
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Load definitions from the file |
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.I source |
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and assign at the global level. |
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The usual set of library directories is searched based on the |
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.I RAYPATH |
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environment variable. |
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.TP |
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.BI -e \ expr |
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Set additional definitions from |
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.I expr. |
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.TP |
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.BI -dj \ frac |
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Set the direct jittering to |
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.I frac. |
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specification will be calculated. |
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.TP |
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.BI -dr \ N |
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Set the number of relays for secondary sources to |
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Set the number of relays for virtual sources to |
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.I N. |
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A value of 0 means that secondary sources will be ignored. |
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A value of 0 means that virtual sources will be ignored. |
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A value of 1 means that sources will be made into first generation |
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secondary sources; a value of 2 means that first generation |
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secondary sources will also be made into second generation secondary |
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virtual sources; a value of 2 means that first generation |
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virtual sources will also be made into second generation virtual |
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sources, and so on. |
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.TP |
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.BI -dp \ D |
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Set the secondary source presampling density to D. |
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Set the virtual source presampling density to D. |
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This is the number of samples per steradian |
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that will be used to determine ahead of time whether or not |
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it is worth following shadow rays through all the reflections and/or |
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transmissions associated with a secondary source path. |
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A value of 0 means that the full secondary source path will always |
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transmissions associated with a virtual source path. |
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A value of 0 means that the full virtual source path will always |
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be tested for shadows if it is tested at all. |
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.TP |
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.BR \-dv |
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Set the ambient accuracy to |
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.I acc. |
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This value will approximately equal the error |
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from indirect illuminance interpolation. |
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from indirect irradiance interpolation. |
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A value of zero implies no interpolation. |
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.TP |
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.BI -ad \ N |
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Set the number of ambient divisions to |
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.I N. |
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The error in the Monte Carlo calculation of indirect |
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illuminance will be inversely proportional to the square |
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irradiance will be inversely proportional to the square |
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root of this number. |
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A value of zero implies no indirect calculation. |
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.TP |
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.BI -af \ fname |
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Set the ambient file to |
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.I fname. |
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This is where indirect illuminance will be stored and retrieved. |
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Normally, indirect illuminance values are kept in memory and |
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This is where indirect irradiance will be stored and retrieved. |
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Normally, indirect irradiance values are kept in memory and |
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lost when the program finishes or dies. |
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By using a file, different invocations can share illuminance |
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By using a file, different invocations can share irradiance |
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values, saving time in the computation. |
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Also, by creating an ambient file during a low resolution rendering, |
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better results can be obtained in a second high resolution pass. |
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Also, by creating an ambient file during a low-resolution rendering, |
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better results can be obtained in a second high-resolution pass. |
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(It is a good idea to keep all of the calculation parameters the same, |
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changing only the dimensions of the output picture.)\0 |
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The ambient file is in a machine-independent binary format |
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which may be examined with |
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.I lookamb(1). |
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above), caustic photon irradiance is evaluated at primary rays, and |
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indirect inscattering in |
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.I mist |
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< |
is accounted for by volume photons. |
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is accounted for by volume photons. Contribution photons are treated as |
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global photons by |
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.I rpict. |
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.IP |
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Additionally specifying |
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.I bwidth2 |
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is invariably looked up. |
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.IP |
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|
Using direct photons replaces the direct calculation with density estimates |
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< |
for debugging and validation of photon emission. |
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for debugging and validation of photon emission. |
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|
.TP |
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|
.BI -am " frac" |
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Maximum search radius for photon map lookups. Without this option, an |
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short lookups. Setting this radius too large, on the other hand, may |
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degrade performance. |
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.TP |
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.BI -ac " pagesize" |
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Set the photon cache page size when using out-of-core photon mapping. The |
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photon cache reduces disk I/O incurred by on-demand loading (paging) of |
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photons, and thus increases performance. This |
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is expressed as a (float) multiple of the density estimate bandwidth |
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specified with |
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.I \-ap |
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under the assumption that photon lookups are local to a cache page. Cache |
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performance is sensitive to this parameter: larger pagesizes will reduce the |
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paging frequency at the expense of higher latency when paging does occur. |
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Sensible values are in the range 4 (default) to 16. |
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.TP |
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.BI -aC " cachesize" |
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Set the total number of photons cached when using out-of-core photon |
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+ |
mapping, taking into account the pagesize specified by |
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.I \-ac. |
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Note that this is approximate as the number of cache pages is rounded to |
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+ |
the nearest prime. This allows adapting the cache to the available physical |
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memory. Cache performance is less sensitive to this parameter, and reasonable |
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performance can obtained with as few as 10k photons. The default is 1M. This |
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option recognises multiplier suffixes (k = 1e3, M = 1e6), both in upper and |
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lower case. |
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.TP |
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|
.BI -me " rext gext bext" |
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Set the global medium extinction coefficient to the indicated color, |
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in units of 1/distance (distance in world coordinates). |
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termination, and the |
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|
.I -lw |
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|
setting (below) must be positive. |
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If N is a negative integer, then this sets the upper limit |
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< |
of reflections past which Russian roulette will be used. |
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> |
If N is a negative integer, then this limits the maximum |
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number of reflections even with Russian roulette. |
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In scenes with dielectrics and total internal reflection, |
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a setting of 0 (no limit) may cause a stack overflow. |
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|
.TP |
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divided by the given |
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|
.I frac. |
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|
.TP |
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+ |
.BI -cs \ Ns |
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+ |
Use |
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+ |
.I Ns |
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bands for spectral sampling rather than the default RGB calculation space. |
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The maximum setting is controlled by the compiler macro MAXCSAMP, and |
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defaults to 24. |
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Larger values for Ns will be reduced to MAXCSAMP. |
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+ |
.TP |
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+ |
.BI -cw " nmA nmB" |
| 733 |
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Set extrema to the given wavelengths for spectral sampling. |
| 734 |
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The default is 380 and 780 nanometers. |
| 735 |
+ |
The order specified does not matter. |
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+ |
.TP |
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|
.BI -S \ seqstart |
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|
Instead of generating a single picture based only on the view |
| 739 |
|
parameters given on the command line, this option causes |
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|
Send error messages and progress reports to |
| 929 |
|
.I efile |
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|
instead of the standard error. |
| 931 |
+ |
(Note this option overlaps with "-e expr" above, so file paths |
| 932 |
+ |
with '=' or ':' in them are not allowed on this option.) |
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|
.TP |
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|
.BR \-w |
| 935 |
|
Boolean switch for warning messages. |
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|
.PP |
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|
rpict \-S 1 \-o frame%02d.hdr scene.oct < keyframes.vf |
| 942 |
|
.PP |
| 943 |
< |
To render ambient illuminance in photon mapping mode from a global photon |
| 943 |
> |
To render ambient irradiance in photon mapping mode from a global photon |
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|
map global.pm via one ambient bounce, and from a caustic photon map |
| 945 |
|
caustic.pm: |
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|
.IP "" .2i |
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|
Greg Ward |
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|
.SH "SEE ALSO" |
| 968 |
|
getinfo(1), lookamb(1), mkpmap(1), oconv(1), pdfblur(1), pfilt(1), |
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< |
pinterp(1), pmblur(1), printf(3), ra_rgbe(1), rad(1), rtrace(1), rvu(1) |
| 969 |
> |
pinterp(1), pmblur(1), printf(3), ra_rgbe(1), rad(1), rpiece(1), rtpict(1), rtrace(1), rvu(1) |
