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(ilhash(hlist,4)+dp->n))/h->nt); |
77 |
< |
hlist[3] = 1; |
77 |
< |
phi = 2.0*PI * (dp->p+urand(ilhash(hlist,4)+dp->n))/h->np; |
75 |
> |
multisamp(spt, 2, urand(ilhash(hlist,3)+dp->n)); |
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); |
86 |
|
rayvalue(&ar); |
87 |
|
ndims--; |
88 |
|
addcolor(dp->v, ar.rcol); |
89 |
< |
if (ar.rt < FHUGE) |
89 |
> |
if (ar.rt > FTINY && ar.rt < FHUGE) |
90 |
|
dp->r += 1.0/ar.rt; |
91 |
|
/* (re)initialize error */ |
92 |
|
if (dp->n++) { |
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) |
206 |
|
b = 1.0/ndivs; |
207 |
|
scalecolor(acol, b); |
208 |
|
if (arad <= FTINY) |
208 |
– |
arad = FHUGE; |
209 |
– |
else |
210 |
– |
arad = (ndivs+ns)/arad; |
211 |
– |
if (arad > maxarad) |
209 |
|
arad = maxarad; |
210 |
< |
else if (arad < minarad) |
210 |
> |
else { |
211 |
> |
arad = (ndivs+ns)/arad; |
212 |
> |
if (arad > maxarad) |
213 |
> |
arad = maxarad; |
214 |
> |
} |
215 |
> |
if (pg != NULL) { /* reduce radius if gradient large */ |
216 |
> |
d = DOT(pg,pg); |
217 |
> |
if (d*arad*arad > 1.0) |
218 |
> |
arad = 1.0/sqrt(d); |
219 |
> |
} |
220 |
> |
if (arad < minarad) { |
221 |
|
arad = minarad; |
222 |
< |
arad /= sqrt(r->rweight); |
223 |
< |
if (pg != NULL) { /* clip pos. gradient if too large */ |
217 |
< |
d = 4.0*DOT(pg,pg)*arad*arad; |
218 |
< |
if (d > 1.0) { |
219 |
< |
d = 1.0/sqrt(d); |
222 |
> |
if (pg != NULL && d*arad*arad > 1.0) { /* cap gradient */ |
223 |
> |
d = 1.0/arad/sqrt(d); |
224 |
|
for (i = 0; i < 3; i++) |
225 |
|
pg[i] *= d; |
226 |
|
} |
227 |
|
} |
228 |
< |
return(arad); |
228 |
> |
return(arad/sqrt(wt)); |
229 |
|
oopsy: |
230 |
|
if (div != NULL) |
231 |
|
free((char *)div); |
233 |
|
} |
234 |
|
|
235 |
|
|
236 |
< |
inithemi(hp, r) /* initialize sampling hemisphere */ |
236 |
> |
inithemi(hp, r, wt) /* initialize sampling hemisphere */ |
237 |
|
register AMBHEMI *hp; |
238 |
|
RAY *r; |
239 |
+ |
double wt; |
240 |
|
{ |
241 |
|
register int i; |
242 |
|
/* set number of divisions */ |
243 |
< |
hp->nt = sqrt(ambdiv * r->rweight * 0.5) + 0.5; |
244 |
< |
hp->np = 2 * hp->nt; |
243 |
> |
if (wt < (.25*PI)/ambdiv+FTINY) { |
244 |
> |
hp->nt = hp->np = 0; |
245 |
> |
return; /* zero samples */ |
246 |
> |
} |
247 |
> |
hp->nt = sqrt(ambdiv * wt / PI) + 0.5; |
248 |
> |
hp->np = PI * hp->nt + 0.5; |
249 |
|
/* make axes */ |
250 |
|
VCOPY(hp->uz, r->ron); |
251 |
|
hp->uy[0] = hp->uy[1] = hp->uy[2] = 0.0; |
336 |
|
if (i > 0) { |
337 |
|
d = dp[-hp->np].r; |
338 |
|
if (dp[0].r > d) d = dp[0].r; |
339 |
< |
d *= 1.0 - sqrt((double)i/hp->nt); |
339 |
> |
d *= 1.0 - (double)i/hp->nt; /* cos(t)^2 */ |
340 |
|
mag0 += d*(b - bright(dp[-hp->np].v)); |
341 |
|
} |
342 |
|
if (j > 0) { |
384 |
|
error(CONSISTENCY, |
385 |
|
"division order in dirgradient"); |
386 |
|
#endif |
387 |
< |
mag += sqrt((i+.5)/hp->nt)*bright(dp->v); |
387 |
> |
mag += sqrt((i+.5)/hp->nt)*bright(dp->v); /* sin(t) */ |
388 |
|
dp += hp->np; |
389 |
|
} |
390 |
|
phi = 2.0*PI * (j+.5)/hp->np + PI/2.0; |