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root/radiance/ray/doc/notes/compile_switches
Revision: 1.3
Committed: Wed Feb 23 18:24:00 2005 UTC (19 years ago) by greg
Branch: MAIN
Changes since 1.2: +8 -0 lines
Log Message:
Added ability to redefine AVGREFL with a compile switch

File Contents

# Content
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
9 -DALIGN=(type) Alignment type, machine-dependent. Most RISC
10 architectures align on 8-word boundaries (double).
11 The default alignment type is int.
12
13 -DSPEED=(MIPS) Millions of instructions per second for this
14 processor (approximate). This is used to decide
15 certain unimportant timing issues such as how many
16 rays to trace before checking input in rvu and
17 whether or not to optimize the color table in ximage
18 on 8-bit displays.
19
20 -DWFLUSH=(rays) Override for number of rays before flush in rvu.
21
22 -DBSD Operating system has a strong Berkeley flavor, meaning
23 that bcopy() and bzero() are present but maybe memcpy()
24 and memset() are not. (See common/standard.h for other
25 things this flag affects.) Also affects certain system
26 calls, such as signal handling and resource tracking.
27
28 -DSMLMEM The system has little RAM available, so size hash
29 tables and the like accordingly. Only allows for
30 small scene descriptions (32,256 primitives).
31
32 -DSMLFLT This setting tells Radiance to use short floats
33 (32 bits) throughout, which saves lots of memory
34 but can cause calculation inaccuracies in many
35 cases. Its use has been discontinued for this reason.
36
37 -DSHADCACHE=N The array size to use for caching occluders.
38 Setting this to 0 turns off this optimization.
39 Values greater than 20 use over 4 Kbytes per
40 light source, which can add up to a lot of
41 memory in scenes with many sources.
42
43 -DAVGREFL=R Set the average surface reflectance for the purpose
44 of indirect irradiance calculations to R, where
45 R is a real number in the range (0,1.0). The
46 default value is 0.50 (50%). This value indirectly
47 controls the maximum number of ambient bounces,
48 which can never be more than the log of the -ad
49 setting times the log of AVGREFL.