60 |
|
RAY *r; |
61 |
|
{ |
62 |
|
RAY ar; |
63 |
< |
int hlist[4]; |
63 |
> |
int hlist[3]; |
64 |
> |
double spt[2]; |
65 |
|
double xd, yd, zd; |
66 |
|
double b2; |
67 |
|
double phi; |
68 |
|
register int i; |
69 |
|
|
70 |
< |
if (rayorigin(&ar, r, AMBIENT, 0.5) < 0) |
70 |
> |
if (rayorigin(&ar, r, AMBIENT, AVGREFL) < 0) |
71 |
|
return(-1); |
72 |
|
hlist[0] = r->rno; |
73 |
|
hlist[1] = dp->t; |
74 |
|
hlist[2] = dp->p; |
75 |
< |
hlist[3] = 0; |
76 |
< |
zd = sqrt((dp->t+urand(urind(ilhash(hlist,4),dp->n)))/h->nt); |
77 |
< |
hlist[3] = 1; |
77 |
< |
phi = 2.0*PI * (dp->p+urand(urind(ilhash(hlist,4),dp->n)))/h->np; |
75 |
> |
peano(spt, 2, urand(ilhash(hlist,3)+dp->n), .01); |
76 |
> |
zd = sqrt((dp->t + spt[0])/h->nt); |
77 |
> |
phi = 2.0*PI * (dp->p + spt[1])/h->np; |
78 |
|
xd = cos(phi) * zd; |
79 |
|
yd = sin(phi) * zd; |
80 |
|
zd = sqrt(1.0 - zd*zd); |
100 |
|
|
101 |
|
|
102 |
|
double |
103 |
< |
doambient(acol, r, pg, dg) /* compute ambient component */ |
103 |
> |
doambient(acol, r, wt, pg, dg) /* compute ambient component */ |
104 |
|
COLOR acol; |
105 |
|
RAY *r; |
106 |
+ |
double wt; |
107 |
|
FVECT pg, dg; |
108 |
|
{ |
109 |
|
double b, d; |
117 |
|
/* initialize color */ |
118 |
|
setcolor(acol, 0.0, 0.0, 0.0); |
119 |
|
/* initialize hemisphere */ |
120 |
< |
inithemi(&hemi, r); |
120 |
> |
inithemi(&hemi, r, wt); |
121 |
|
ndivs = hemi.nt * hemi.np; |
122 |
|
if (ndivs == 0) |
123 |
|
return(0.0); |
124 |
|
/* set number of super-samples */ |
125 |
< |
ns = ambssamp * r->rweight + 0.5; |
125 |
> |
ns = ambssamp * wt + 0.5; |
126 |
|
if (ns > 0 || pg != NULL || dg != NULL) { |
127 |
|
div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP)); |
128 |
|
if (div == NULL) |
213 |
|
arad = maxarad; |
214 |
|
else if (arad < minarad) |
215 |
|
arad = minarad; |
216 |
< |
arad /= sqrt(r->rweight); |
216 |
> |
arad /= sqrt(wt); |
217 |
|
if (pg != NULL) { /* clip pos. gradient if too large */ |
218 |
|
d = 4.0*DOT(pg,pg)*arad*arad; |
219 |
|
if (d > 1.0) { |
230 |
|
} |
231 |
|
|
232 |
|
|
233 |
< |
inithemi(hp, r) /* initialize sampling hemisphere */ |
233 |
> |
inithemi(hp, r, wt) /* initialize sampling hemisphere */ |
234 |
|
register AMBHEMI *hp; |
235 |
|
RAY *r; |
236 |
+ |
double wt; |
237 |
|
{ |
238 |
|
register int i; |
239 |
|
/* set number of divisions */ |
240 |
< |
hp->nt = sqrt(ambdiv * r->rweight * 0.5) + 0.5; |
241 |
< |
hp->np = 2 * hp->nt; |
240 |
> |
hp->nt = sqrt(ambdiv * wt / PI) + 0.5; |
241 |
> |
hp->np = PI * hp->nt; |
242 |
|
/* make axes */ |
243 |
|
VCOPY(hp->uz, r->ron); |
244 |
|
hp->uy[0] = hp->uy[1] = hp->uy[2] = 0.0; |