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root/radiance/ray/doc/notes/rpict.options
Revision: 1.2
Committed: Wed Sep 24 14:55:53 2003 UTC (20 years, 10 months ago) by greg
Branch: MAIN
Changes since 1.1: +5 -5 lines
Log Message:
Increased default ambient options in rpict, rtrace, rview, rad & mkillum

File Contents

# User Rev Content
1 greg 1.1 SETTING RENDERING OPTIONS
2    
3     The table below gives some useful ranges for some Radiance 2.4 parameters.
4     The "min" value gives the fastest, crudest rendering. It is not
5     necessarily the smallest value numerically. The "fast" value gives
6     a reasonably fast rendering. The "accur" value gives a reasonably
7     accurate rendering. The "max" value gives the ultimate in accuracy.
8    
9     Param Description Min Fast Accur Max Notes
10     ===== ==================== ===== ===== ===== ===== =====
11     -ps pixel sampling rate 16 8 4 1
12     -pt sampling threshold 1 .15 .05 0
13     -pj anti-aliasing jitter 0 .6 .9 1 A
14     -pm pixel motion 0 0 1 1 B
15     -dj source jitter 0 0 .7 1 B
16     -ds source substructuring 0 .5 .15 .02
17     -dt direct thresholding 1 .5 .05 0 C
18     -dc direct certainty 0 .25 .5 1
19     -dr direct relays 0 1 3 6
20     -dp direct pretest density 32 64 512 0 C
21     -sj specular jitter 0 .3 .7 1 A
22     -st specular threshold 1 .85 .15 0 C
23     -aw ambient weight 0 100 10 inf A
24     -ab ambient bounces 0 0 2 8
25 greg 1.2 -aa ambient accuracy .5 .2 .1 0 C
26     -ar ambient resolution 8 32 256 0 C
27     -ad ambient divisions 0 128 1024 8192
28     -as ambient super-samples 0 32 512 2048
29 greg 1.1 -ms mist sampling dist. 0 10 1 .01
30 greg 1.2 -lr limit reflection 0 6 8 16
31 greg 1.1 -lw limit weight .05 .01 .002 0 C
32    
33     NOTES:
34     A) This option does not affect the rendering time
35     B) This option adversely affects image sampling (ie. use -ps 1)
36     C) Maximum value disables optimization and can be very expensive
37    
38     -------------------------------------------------------------------------
39    
40     ARTIFACTS ASSOCIATED WITH OPTIONS
41    
42     Param Artifact Solution
43     ===== =================================== =========================
44     -ps "missing pieces" to objects decrease value by 50%
45     -pt some soft edges are very jagged decrease value by 50%
46     -pj diagonal edges are like staircases increase value to 0.9
47     -pj edges look too erratic decrease value to 0.4
48     -dj shadows are unnaturally sharp increase value to 0.7
49     -ds large sources cast unnatural shadows decrease value by 50%
50     -dt some shadows disappear decrease value by 50%
51     -dc inaccurate values with many sources increase value to .75
52     -dr missing multiple mirror reflections increment value
53     -dp incorrect mirror reflections double value
54     -sj specular reflections too fuzzy decrease value to 0.2
55     -sj specular reflections too sharp increase value to 1
56     -st some specular highlights missing decrease value to 0.02
57     -aw shadows appear to glow set value to 0
58     -ab lighting in shadows too flat increment value
59     -av overall light level seems too high/low decrease/increase value
60     -aa uneven shading boundaries in shadows decrease value by 25%
61     -ar shading wrong in some areas double or quadruple value
62     -ad "splotches" of light double value
63     -as "splotches" of light increase to half of -ad setting
64     -ms "noisy" mist scattering divide value by 2
65     -lr some multiple specular reflections gone increment value
66     -lw some specular reflections gone decrease value by 50%
67    
68     -------------------------------------------------------------------------
69    
70     TIMINGS ASSOCIATED WITH OPTIONS
71    
72     Param Effect on Execution Time
73     ===== ==================================================================
74     -ps inverse, halving value increases rendering time up to four times
75     -pt minor, decreasing value causes modest increase in rendering time
76     -pj no effect
77     -dj indirect, increasing value requires -ps parameter to be reduced
78     -ds inverse, halving value causes rendering time to approximately double
79     -dt inverse, halving value causes rendering time to increase about 50%
80     -dc direct, affects rendering time up to 50% over its 0 to 1 range
81     -dr direct, depending on the scene each new reflection can double time
82     -dp minor, affects start-up time only, higher values take longer
83     -sj no effect
84     -st minor, a value of zero may increase rendering by 50% over maximum of 1
85     -ab direct, doubling this value can double rendering time
86     -aa direct, doubling this value approximately quadruples rendering time
87     -ar direct, effect depends on scene, can quadruple time for double value
88     -ad direct, doubling value may double rendering time
89     -as direct, effectively adds to -ad parameter and its cost
90     -lr minor, increase causes very slightly longer rendering time
91     -lw minor, decrease causes very slightly longer rendering time