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Revision 1.27 by rschregle, Fri Jun 5 08:49:01 2015 UTC vs.
Revision 1.29 by rschregle, Fri Jan 26 18:30:27 2018 UTC

# Line 533 | Line 533 | Global photon irradiance is evaluated as part of the a
533   above), caustic photon irradiance is evaluated at primary rays, and
534   indirect inscattering in
535   .I mist
536 < is accounted for by volume photons.
536 > is accounted for by volume photons. Contribution photons are treated as
537 > global photons by
538 > .I rtrace.
539   .IP
540   Additionally specifying
541   .I bwidth2
# Line 567 | Line 569 | option; the number of photons found will not exceed th
569   lower if the maximum search radius contains fewer photons, thus resulting in
570   short lookups.  Setting this radius too large, on the other hand, may
571   degrade performance.
572 + .TP
573 + .BI -ac " pagesize"
574 + Set the photon cache page size when using out-of-core photon mapping. The
575 + photon cache reduces disk I/O incurred by on-demand loading (paging) of
576 + photons, and thus increases performance. This
577 + is expressed as a (float) multiple of the density estimate bandwidth
578 + specified with
579 + .I \-ap
580 + under the assumption that photon lookups are local to a cache page. Cache
581 + performance is sensitive to this parameter: larger pagesizes will reduce the
582 + paging frequency at the expense of higher latency when paging does occur.
583 + Sensible values are in the range 4 (default) to 16.
584 + .TP
585 + .BI -aC " cachesize"
586 + Set the total number of photons cached when using out-of-core photon
587 + mapping, taking into account the pagesize specified by
588 + .I \-ac.
589 + Note that this is approximate as the number of cache pages is rounded to
590 + the nearest prime. This allows adapting the cache to the available physical
591 + memory. In conjunction with the
592 + .I \-n
593 + option, this is the cache size
594 + .I per parallel process.
595 + Cache performance is less sensitive to this parameter,
596 + and reasonable performance can obtained with as few as 10k photons. The
597 + default is 1M. This option recognises multiplier suffixes (k = 1e3, M =
598 + 1e6), both in upper and lower case.
599   .TP
600   .BI -me " rext gext bext"
601   Set the global medium extinction coefficient to the indicated color,

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