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Comparing ray/doc/notes/compile_switches (file contents):
Revision 1.1 by greg, Sat Mar 15 17:32:55 2003 UTC vs.
Revision 1.4 by greg, Mon Jun 13 20:07:56 2005 UTC

#	Line 1 | Line 1
1		Here is a list of compile switches, used to customize Radiance code
2		for specific machines and users:
3
4	–	-DMC            If set, switches from default low-discrepency sequence
5	–	sampling to true (pseudorandom) Monte Carlo.  Use if
6	–	the "brushed" appearance of specular highlights and
7	–	penumbras bothers you.
8	–
4		-DALIGN=(type)  Alignment type, machine-dependent.  Most RISC
5		architectures align on 8-word boundaries (double).
6		The default alignment type is int.
#	Line 13 | Line 8 | for specific machines and users:
8		-DSPEED=(MIPS)  Millions of instructions per second for this
9		processor (approximate).  This is used to decide
10		certain unimportant timing issues such as how many
11	<	rays to trace before checking input in rview and
11	>	rays to trace before checking input in rvu and
12		whether or not to optimize the color table in ximage
13		on 8-bit displays.
14
15	<	-DWFLUSH=(rays) Override for number of rays before flush in rview.
15	>	-DWFLUSH=(rays) Override for number of rays before flush in rvu.
16
17		-DBSD           Operating system has a strong Berkeley flavor, meaning
18		that bcopy() and bzero() are present but maybe memcpy()
#	Line 25 | Line 20 | for specific machines and users:
20		things this flag affects.)  Also affects certain system
21		calls, such as signal handling and resource tracking.
22
23	<	-DBIGMEM        The system has lots of RAM available, so size hash
24	<	tables and the like accordingly.  Also provides for
25	<	larger overall scene descriptions (33,553,920 primitives
31	<	rather than 32,256).
23	>	-DSMLMEM        The system has little RAM available, so size hash
24	>	tables and the like accordingly.  Only allows for
25	>	small scene descriptions (32,256 primitives).
26
27		-DSMLFLT        This setting tells Radiance to use short floats
28	<	(4-bytes) throughout, which saves lots of memory
28	>	(32 bits) throughout, which saves lots of memory
29		but can cause calculation inaccuracies in many
30		cases.  Its use has been discontinued for this reason.
31	+
32	+	-DSHADCACHE=N   The array size to use for caching occluders.
33	+	Setting this to 0 turns off this optimization.
34	+	Values greater than 20 use over 4 Kbytes per
35	+	light source, which can add up to a lot of
36	+	memory in scenes with many sources.
37	+
38	+	-DAVGREFL=R     Set the average surface reflectance for the purpose
39	+	of indirect irradiance calculations to R, where
40	+	R is a real number in the range (0,1.0).  The
41	+	default value is 0.50 (50%).  This value indirectly
42	+	controls the maximum number of ambient bounces,
43	+	which can never be more than the log of the -ad
44	+	setting times the log of AVGREFL.

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