30 |
|
r0*((t-2.0)*t+1.0)*t + \ |
31 |
|
r1*(t-1.0)*t*t ) |
32 |
|
|
33 |
< |
double *noise3(), noise3coef(), argument(), frand(); |
33 |
> |
static char *noise_name[4] = {"noise3a", "noise3b", "noise3c", "noise3"}; |
34 |
> |
static char fnoise_name[] = "fnoise3"; |
35 |
> |
static char hermite_name[] = "hermite"; |
36 |
|
|
37 |
+ |
double *noise3(), fnoise3(), argument(), frand(); |
38 |
+ |
|
39 |
|
static long xlim[3][2]; |
40 |
|
static double xarg[3]; |
41 |
|
|
43 |
|
|
44 |
|
#define frand3(x,y,z) frand(17*(x)+23*(y)+29*(z)) |
45 |
|
|
42 |
– |
double fnoise3(); |
46 |
|
|
47 |
< |
|
48 |
< |
double |
49 |
< |
l_noise3() /* compute 3-dimensional noise function */ |
47 |
> |
static double |
48 |
> |
l_noise3(nam) /* compute a noise function */ |
49 |
> |
register char *nam; |
50 |
|
{ |
51 |
< |
return(noise3coef(D)); |
51 |
> |
register int i; |
52 |
> |
double x[3]; |
53 |
> |
/* get point */ |
54 |
> |
x[0] = argument(1); |
55 |
> |
x[1] = argument(2); |
56 |
> |
x[2] = argument(3); |
57 |
> |
/* make appropriate call */ |
58 |
> |
if (nam == fnoise_name) |
59 |
> |
return(fnoise3(x)); |
60 |
> |
i = 4; |
61 |
> |
while (i--) |
62 |
> |
if (nam == noise_name[i]) |
63 |
> |
return(noise3(x)[i]); |
64 |
> |
eputs("Bad call to l_noise3()!\n"); |
65 |
> |
quit(1); |
66 |
|
} |
67 |
|
|
68 |
|
|
69 |
|
double |
70 |
< |
l_noise3a() /* compute x slope of noise function */ |
70 |
> |
l_hermite() /* library call for hermite interpolation */ |
71 |
|
{ |
72 |
< |
return(noise3coef(A)); |
72 |
> |
double t; |
73 |
> |
|
74 |
> |
t = argument(5); |
75 |
> |
return( hermite(argument(1), argument(2), |
76 |
> |
argument(3), argument(4), t) ); |
77 |
|
} |
78 |
|
|
79 |
|
|
80 |
< |
double |
60 |
< |
l_noise3b() /* compute y slope of noise function */ |
80 |
> |
setnoisefuncs() /* add noise functions to library */ |
81 |
|
{ |
82 |
< |
return(noise3coef(B)); |
63 |
< |
} |
82 |
> |
register int i; |
83 |
|
|
84 |
< |
|
85 |
< |
double |
86 |
< |
l_noise3c() /* compute z slope of noise function */ |
87 |
< |
{ |
88 |
< |
return(noise3coef(C)); |
84 |
> |
funset(hermite_name, 5, ':', l_hermite); |
85 |
> |
funset(fnoise_name, 3, ':', l_noise3); |
86 |
> |
i = 4; |
87 |
> |
while (i--) |
88 |
> |
funset(noise_name[i], 3, ':', l_noise3); |
89 |
|
} |
90 |
|
|
91 |
|
|
73 |
– |
double |
74 |
– |
l_fnoise3() /* compute fractal noise function */ |
75 |
– |
{ |
76 |
– |
double x[3]; |
77 |
– |
|
78 |
– |
x[0] = argument(1); |
79 |
– |
x[1] = argument(2); |
80 |
– |
x[2] = argument(3); |
81 |
– |
|
82 |
– |
return(fnoise3(x)); |
83 |
– |
} |
84 |
– |
|
85 |
– |
|
86 |
– |
static double |
87 |
– |
noise3coef(coef) /* return coefficient of noise function */ |
88 |
– |
int coef; |
89 |
– |
{ |
90 |
– |
double x[3]; |
91 |
– |
|
92 |
– |
x[0] = argument(1); |
93 |
– |
x[1] = argument(2); |
94 |
– |
x[2] = argument(3); |
95 |
– |
|
96 |
– |
return(noise3(x)[coef]); |
97 |
– |
} |
98 |
– |
|
99 |
– |
|
92 |
|
double * |
93 |
|
noise3(xnew) /* compute the noise function */ |
94 |
|
register double xnew[3]; |
141 |
|
{ |
142 |
|
s = s<<13 ^ s; |
143 |
|
return(1.0-((s*(s*s*15731+789221)+1376312589)&0x7fffffff)/1073741824.0); |
152 |
– |
} |
153 |
– |
|
154 |
– |
|
155 |
– |
double |
156 |
– |
l_hermite() /* library call for hermite interpolation */ |
157 |
– |
{ |
158 |
– |
double t; |
159 |
– |
|
160 |
– |
t = argument(5); |
161 |
– |
return( hermite(argument(1), argument(2), |
162 |
– |
argument(3), argument(4), t) ); |
144 |
|
} |
145 |
|
|
146 |
|
|