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Comparing ray/doc/notes/rpict.options (file contents):
Revision 1.1 by greg, Sat Mar 15 17:32:55 2003 UTC vs.
Revision 1.5 by greg, Wed Feb 15 15:43:43 2017 UTC

# Line 12 | Line 12 | Param   Description             Min     Fast    Accur
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
15 > -pd     pixel depth of field    0       0       depends inf     B
16 > -dj     source jitter           0       0       .9      1       B
17 > -ds     source substructuring   0       .5      .15     .05
18   -dt     direct thresholding     1       .5      .05     0       C
19   -dc     direct certainty        0       .25     .5      1
20   -dr     direct relays           0       1       3       6
21   -dp     direct pretest density  32      64      512     0       C
22 < -sj     specular jitter         0       .3      .7      1       A
22 > -ss     specular sampling       0       .3      32      inf     B
23   -st     specular threshold      1       .85     .15     0       C
24   -aw     ambient weight          0       100     10      inf     A
25   -ab     ambient bounces         0       0       2       8
26 < -aa     ambient accuracy        .5      .2      .15     0       C
27 < -ar     ambient resolution      8       32      128     0       C
28 < -ad     ambient divisions       0       32      512     4096
29 < -as     ambient super-samples   0       32      256     1024
26 > -aa     ambient accuracy        .5      .2      .1      0       C
27 > -ar     ambient resolution      8       32      256     0       C
28 > -ad     ambient divisions       0       128     1024    8192
29 > -as     ambient super-samples   0       32      512     2048
30   -ms     mist sampling dist.     0       10      1       .01
31 < -lr     limit reflection        0       4       8       16
31 > -lr     limit reflection        0       6       8       16
32   -lw     limit weight            .05     .01     .002    0       C
33  
34   NOTES:
# Line 45 | Line 46 | Param   Artifact                               Solution
46   -pt     some soft edges are very jagged         decrease value by 50%
47   -pj     diagonal edges are like staircases      increase value to 0.9
48   -pj     edges look too erratic                  decrease value to 0.4
49 < -dj     shadows are unnaturally sharp           increase value to 0.7
49 > -dj     shadows are unnaturally sharp           increase value to 0.9
50   -ds     large sources cast unnatural shadows    decrease value by 50%
51   -dt     some shadows disappear                  decrease value by 50%
52   -dc     inaccurate values with many sources     increase value to .75
53   -dr     missing multiple mirror reflections     increment value
54   -dp     incorrect mirror reflections            double value
55 < -sj     specular reflections too fuzzy          decrease value to 0.2
56 < -sj     specular reflections too sharp          increase value to 1
55 > -ss     specular reflections too fuzzy          decrease value to 0.2
56 > -ss     specular reflections too noisy          increase value to 16
57   -st     some specular highlights missing        decrease value to 0.02
58   -aw     shadows appear to glow                  set value to 0
59   -ab     lighting in shadows too flat            increment value
# Line 74 | Line 75 | Param   Effect on Execution Time
75   -ps     inverse, halving value increases rendering time up to four times
76   -pt     minor, decreasing value causes modest increase in rendering time
77   -pj     no effect
78 + -pm     no effect
79 + -pd     no effect
80   -dj     indirect, increasing value requires -ps parameter to be reduced
81   -ds     inverse, halving value causes rendering time to approximately double
82   -dt     inverse, halving value causes rendering time to increase about 50%
83   -dc     direct, affects rendering time up to 50% over its 0 to 1 range
84   -dr     direct, depending on the scene each new reflection can double time
85   -dp     minor, affects start-up time only, higher values take longer
86 < -sj     no effect
86 > -ss     no effect until > 1, then linear increase for specular surfaces
87   -st     minor, a value of zero may increase rendering by 50% over maximum of 1
88   -ab     direct, doubling this value can double rendering time
89 < -aa     direct, doubling this value approximately quadruples rendering time
89 > -aa     direct, halving this value approximately quadruples rendering time
90   -ar     direct, effect depends on scene, can quadruple time for double value
91   -ad     direct, doubling value may double rendering time
92   -as     direct, effectively adds to -ad parameter and its cost
93 + -ms     direct, halving value increases time by a factor of two in mist regions
94   -lr     minor, increase causes very slightly longer rendering time
95   -lw     minor, decrease causes very slightly longer rendering time

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