cal/cal/noise.cal

{ RCSid $Id$ }
{ 1-D Perlin Noise function }

frac(x):x-floor(x);

hermite(p0,p1,r0,r1,t) :        p0 * ((2*t-3)*t*t+1) +
                                p1 * (-2*t+3)*t*t +
                                r0 * (((t-2)*t+1)*t) +
                                r1 * ((t-1)*t*t);

rand2a(x) : 1-2*rand(.69692*x);
rand2b(x) : 1-2*rand(.05393*x);

noise_1(xl,xd,xu) : hermite(
                                rand2a(xl),
                                rand2a(xu),
                                rand2b(xl),
                                rand2b(xu),
                                xd);

noise(x) : noise_1(floor(x),frac(x),ceil(x));
Revision:	1.3
Committed:	Wed Nov 21 17:45:45 2018 UTC (5 years, 5 months ago) by greg
Branch:	MAIN
CVS Tags:	rad5R4, rad5R3, HEAD
Changes since 1.2:	+10 -7 lines
Log Message:	Minor fixes/improvements
#	Content
1	{ RCSid $Id$ }
2	{ 1-D Perlin Noise function }
3
4	frac(x):x-floor(x);
5
6	hermite(p0,p1,r0,r1,t) : p0 * ((2t-3)t*t+1) +
7	p1 * (-2t+3)t*t +
8	r0 * (((t-2)t+1)t) +
9	r1 * ((t-1)tt);
10
11	rand2a(x) : 1-2rand(.69692x);
12	rand2b(x) : 1-2rand(.05393x);
13
14	noise_1(xl,xd,xu) : hermite(
15	rand2a(xl),
16	rand2a(xu),
17	rand2b(xl),
18	rand2b(xu),
19	xd);
20
21	noise(x) : noise_1(floor(x),frac(x),ceil(x));