| Revision: | 1.1 |
| Committed: | Sat Feb 22 02:07:21 2003 UTC (21 years, 2 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); |