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SETTING RENDERING OPTIONS |
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|
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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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|
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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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-pd pixel depth of field 0 0 depends inf B |
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-dj source jitter 0 0 .9 1 B |
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-ds source substructuring 0 .5 .15 .05 |
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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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-ss specular sampling 0 .3 32 inf B |
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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 .1 0 C |
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-ar ambient resolution 8 32 256 0 C |
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-ad ambient divisions 0 128 1024 8192 |
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-as ambient super-samples 0 32 512 2048 |
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-ms mist sampling dist. 0 10 1 .01 |
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-lr limit reflection 0 6 8 16 |
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-lw limit weight .05 .01 .002 0 C |
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|
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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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------------------------------------------------------------------------- |
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|
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ARTIFACTS ASSOCIATED WITH OPTIONS |
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|
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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 0.9 |
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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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-ss specular reflections too fuzzy decrease value to 0.2 |
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-ss specular reflections too noisy increase value to 16 |
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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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------------------------------------------------------------------------- |
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|
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TIMINGS ASSOCIATED WITH OPTIONS |
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|
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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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-pm no effect |
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-pd 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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-ss no effect until > 1, then linear increase for specular surfaces |
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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, halving 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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-ms direct, halving value increases time by a factor of two in mist regions |
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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 |
