| 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 |
|
|
