			SETTING RENDERING OPTIONS

The table below gives some useful ranges for some Radiance 2.4 parameters.
The "min" value gives the fastest, crudest rendering.  It is not
necessarily the smallest value numerically.  The "fast" value gives
a reasonably fast rendering.  The "accur" value gives a reasonably
accurate rendering.  The "max" value gives the ultimate in accuracy.

Param   Description             Min     Fast    Accur   Max     Notes
=====   ====================    =====   =====   =====   =====   =====
-ps     pixel sampling rate     16      8       4       1
-pt     sampling threshold      1       .15     .05     0
-pj     anti-aliasing jitter    0       .6      .9      1       A
-pm	pixel motion		0	0	1	1	B
-dj     source jitter           0       0       .9      1       B
-ds     source substructuring   0       .5      .15     .05
-dt     direct thresholding     1       .5      .05     0	C
-dc     direct certainty        0       .25     .5      1
-dr	direct relays		0	1	3	6
-dp	direct pretest density	32	64	512	0	C
-sj	specular jitter		0	.3	.7	1	A
-st	specular threshold	1	.85	.15	0	C
-aw	ambient weight		0	100	10	inf	A
-ab	ambient bounces		0	0	2	8
-aa	ambient accuracy	.5	.2	.1	0	C
-ar	ambient resolution	8	32	256	0	C
-ad	ambient divisions	0	128	1024	8192
-as	ambient super-samples	0	32	512	2048
-ms	mist sampling dist.	0	10	1	.01
-lr	limit reflection	0	6	8	16
-lw	limit weight		.05	.01	.002	0	C

NOTES:
        A) This option does not affect the rendering time
        B) This option adversely affects image sampling (ie. use -ps 1)
	C) Maximum value disables optimization and can be very expensive

-------------------------------------------------------------------------

		ARTIFACTS ASSOCIATED WITH OPTIONS

Param   Artifact				Solution
=====   ===================================    	=========================
-ps     "missing pieces" to objects		decrease value by 50%
-pt     some soft edges are very jagged		decrease value by 50%
-pj     diagonal edges are like staircases	increase value to 0.9
-pj     edges look too erratic			decrease value to 0.4
-dj     shadows are unnaturally sharp		increase value to 0.9
-ds     large sources cast unnatural shadows	decrease value by 50%
-dt     some shadows disappear			decrease value by 50%
-dc     inaccurate values with many sources	increase value to .75
-dr	missing multiple mirror reflections	increment value
-dp	incorrect mirror reflections		double value
-sj	specular reflections too fuzzy		decrease value to 0.2
-sj	specular reflections too sharp		increase value to 1
-st	some specular highlights missing	decrease value to 0.02
-aw	shadows appear to glow			set value to 0
-ab	lighting in shadows too flat		increment value
-av	overall light level seems too high/low	decrease/increase value
-aa	uneven shading boundaries in shadows	decrease value by 25%
-ar	shading wrong in some areas		double or quadruple value
-ad	"splotches" of light			double value
-as	"splotches" of light			increase to half of -ad setting
-ms	"noisy" mist scattering			divide value by 2
-lr	some multiple specular reflections gone	increment value
-lw	some specular reflections gone		decrease value by 50%

-------------------------------------------------------------------------

		TIMINGS ASSOCIATED WITH OPTIONS

Param   Effect on Execution Time
=====   ==================================================================
-ps     inverse, halving value increases rendering time up to four times
-pt     minor, decreasing value causes modest increase in rendering time
-pj     no effect
-dj     indirect, increasing value requires -ps parameter to be reduced
-ds     inverse, halving value causes rendering time to approximately double
-dt     inverse, halving value causes rendering time to increase about 50%
-dc     direct, affects rendering time up to 50% over its 0 to 1 range
-dr	direct, depending on the scene each new reflection can double time
-dp	minor, affects start-up time only, higher values take longer
-sj	no effect
-st	minor, a value of zero may increase rendering by 50% over maximum of 1
-ab	direct, doubling this value can double rendering time
-aa	direct, doubling this value approximately quadruples rendering time
-ar	direct, effect depends on scene, can quadruple time for double value
-ad	direct, doubling value may double rendering time
-as	direct, effectively adds to -ad parameter and its cost
-lr	minor, increase causes very slightly longer rendering time
-lw	minor, decrease causes very slightly longer rendering time
