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1.1 |
SETTING RENDERING OPTIONS
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The table below gives some useful ranges for some Radiance 2.4 parameters.
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The "min" value gives the fastest, crudest rendering. It is not
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necessarily the smallest value numerically. The "fast" value gives
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a reasonably fast rendering. The "accur" value gives a reasonably
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accurate rendering. The "max" value gives the ultimate in accuracy.
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Param Description Min Fast Accur Max Notes
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===== ==================== ===== ===== ===== ===== =====
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-ps pixel sampling rate 16 8 4 1
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-pt sampling threshold 1 .15 .05 0
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-pj anti-aliasing jitter 0 .6 .9 1 A
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-pm pixel motion 0 0 1 1 B
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-dj source jitter 0 0 .7 1 B
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-ds source substructuring 0 .5 .15 .02
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-dt direct thresholding 1 .5 .05 0 C
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-dc direct certainty 0 .25 .5 1
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-dr direct relays 0 1 3 6
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-dp direct pretest density 32 64 512 0 C
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-sj specular jitter 0 .3 .7 1 A
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-st specular threshold 1 .85 .15 0 C
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-aw ambient weight 0 100 10 inf A
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-ab ambient bounces 0 0 2 8
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-aa ambient accuracy .5 .2 .15 0 C
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-ar ambient resolution 8 32 128 0 C
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-ad ambient divisions 0 32 512 4096
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-as ambient super-samples 0 32 256 1024
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-ms mist sampling dist. 0 10 1 .01
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-lr limit reflection 0 4 8 16
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-lw limit weight .05 .01 .002 0 C
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NOTES:
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A) This option does not affect the rendering time
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B) This option adversely affects image sampling (ie. use -ps 1)
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C) Maximum value disables optimization and can be very expensive
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-------------------------------------------------------------------------
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ARTIFACTS ASSOCIATED WITH OPTIONS
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Param Artifact Solution
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===== =================================== =========================
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-ps "missing pieces" to objects decrease value by 50%
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-pt some soft edges are very jagged decrease value by 50%
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-pj diagonal edges are like staircases increase value to 0.9
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-pj edges look too erratic decrease value to 0.4
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-dj shadows are unnaturally sharp increase value to 0.7
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-ds large sources cast unnatural shadows decrease value by 50%
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-dt some shadows disappear decrease value by 50%
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-dc inaccurate values with many sources increase value to .75
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-dr missing multiple mirror reflections increment value
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-dp incorrect mirror reflections double value
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-sj specular reflections too fuzzy decrease value to 0.2
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-sj specular reflections too sharp increase value to 1
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-st some specular highlights missing decrease value to 0.02
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-aw shadows appear to glow set value to 0
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-ab lighting in shadows too flat increment value
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-av overall light level seems too high/low decrease/increase value
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-aa uneven shading boundaries in shadows decrease value by 25%
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-ar shading wrong in some areas double or quadruple value
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-ad "splotches" of light double value
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-as "splotches" of light increase to half of -ad setting
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-ms "noisy" mist scattering divide value by 2
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-lr some multiple specular reflections gone increment value
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-lw some specular reflections gone decrease value by 50%
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-------------------------------------------------------------------------
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TIMINGS ASSOCIATED WITH OPTIONS
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Param Effect on Execution Time
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===== ==================================================================
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-ps inverse, halving value increases rendering time up to four times
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-pt minor, decreasing value causes modest increase in rendering time
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-pj no effect
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-dj indirect, increasing value requires -ps parameter to be reduced
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-ds inverse, halving value causes rendering time to approximately double
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-dt inverse, halving value causes rendering time to increase about 50%
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-dc direct, affects rendering time up to 50% over its 0 to 1 range
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-dr direct, depending on the scene each new reflection can double time
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-dp minor, affects start-up time only, higher values take longer
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-sj no effect
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-st minor, a value of zero may increase rendering by 50% over maximum of 1
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-ab direct, doubling this value can double rendering time
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-aa direct, doubling this value approximately quadruples rendering time
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-ar direct, effect depends on scene, can quadruple time for double value
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-ad direct, doubling value may double rendering time
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-as direct, effectively adds to -ad parameter and its cost
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-lr minor, increase causes very slightly longer rendering time
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-lw minor, decrease causes very slightly longer rendering time
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