Revision: | 1.1 |
Committed: | Sat Feb 22 02:07:21 2003 UTC (21 years, 3 months ago) by greg |
Branch: | MAIN |
CVS Tags: | rad5R2, rad4R2P2, rad5R0, rad5R1, rad3R7P2, rad3R7P1, rad4R2, rad4R1, rad4R0, rad3R5, rad3R6, rad3R6P1, rad3R8, rad3R9, rad4R2P1 |
Log Message: | Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release |
# | Content |
---|---|
1 | frac(x)=x-floor(x); |
2 | |
3 | hermite(p0,p1,r0,r1,t) = p0 * ((2*t-3)*t*t+1) + |
4 | p1 * (-2*t+3)*t*t + |
5 | r0 * (((t-2)*t+1)*t) + |
6 | r1 * ((t-1)*t*t); |
7 | |
8 | rand2a(x,y) = 1-2*rand(.69692*x+.35084*y); |
9 | rand2b(x,y) = 1-2*rand(.05393*x+.96196*y); |
10 | rand2c(x,y) = 1-2*rand(.04234*x+.46180*y); |
11 | |
12 | noise2(x,y) = noise_2( floor(x),frac(x),ceil(x), |
13 | floor(y),frac(y),ceil(y) ); |
14 | |
15 | noise_2(xl,xd,xu,yl,yd,yu) = |
16 | hermite( |
17 | hermite(rand2c(xl,yl), |
18 | rand2c(xu,yl), |
19 | rand2a(xl,yl), |
20 | rand2a(xu,yl), |
21 | xd), |
22 | hermite(rand2c(xl,yu), |
23 | rand2c(xu,yu), |
24 | rand2a(xl,yu), |
25 | rand2a(xu,yu), |
26 | xd), |
27 | (1-xd)*rand2b(xl,yl)+ |
28 | xd*rand2b(xu,yl), |
29 | (1-xd)*rand2b(xl,yu)+ |
30 | xd*rand2b(xu,yu), |
31 | yd); |