15 |
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#include "random.h" |
16 |
|
|
17 |
|
|
18 |
+ |
static int cyl_partit(), flt_partit(); |
19 |
+ |
|
20 |
+ |
|
21 |
|
double |
22 |
|
nextssamp(r, si) /* compute sample for source, rtn. distance */ |
23 |
|
register RAY *r; /* origin is read, direction is set */ |
27 |
|
FVECT vpos; |
28 |
|
double d; |
29 |
|
register int i; |
30 |
< |
tryagain: |
30 |
> |
nextsample: |
31 |
|
while (++si->sp >= si->np) { /* get next sample */ |
32 |
|
if (++si->sn >= nsources) |
33 |
|
return(0.0); /* no more */ |
34 |
< |
if (srcsizerat <= FTINY) |
34 |
> |
if (source[si->sn].sflags & SSKIP) |
35 |
> |
si->np = 0; |
36 |
> |
else if (srcsizerat <= FTINY) |
37 |
|
nopart(si, r); |
38 |
|
else { |
39 |
|
for (i = si->sn; source[i].sflags & SVIRTUAL; |
79 |
|
r->rdir[i] -= r->rorg[i]; |
80 |
|
/* compute distance */ |
81 |
|
if ((d = normalize(r->rdir)) == 0.0) |
82 |
< |
goto tryagain; /* at source! */ |
82 |
> |
goto nextsample; /* at source! */ |
83 |
|
|
84 |
|
/* compute sample size */ |
85 |
|
si->dom = source[si->sn].ss2; |
86 |
|
if (source[si->sn].sflags & SFLAT) { |
87 |
|
si->dom *= sflatform(si->sn, r->rdir); |
88 |
< |
if (si->dom <= FTINY) { /* behind source */ |
84 |
< |
si->np = 0; |
85 |
< |
goto tryagain; |
86 |
< |
} |
87 |
< |
si->dom *= (double)(size[SU]*size[SV])/(MAXSPART*MAXSPART); |
88 |
> |
si->dom *= size[SU]*size[SV]/(MAXSPART*(double)MAXSPART); |
89 |
|
} else if (source[si->sn].sflags & SCYL) { |
90 |
|
si->dom *= scylform(si->sn, r->rdir); |
91 |
< |
si->dom *= (double)size[SU]/MAXSPART; |
91 |
> |
si->dom *= size[SU]/(double)MAXSPART; |
92 |
|
} else { |
93 |
< |
si->dom *= (double)(size[SU]*size[SV]*size[SW]) / |
94 |
< |
(MAXSPART*MAXSPART*MAXSPART) ; |
93 |
> |
si->dom *= size[SU]*size[SV]*(double)size[SW] / |
94 |
> |
(MAXSPART*MAXSPART*(double)MAXSPART) ; |
95 |
|
} |
96 |
|
if (source[si->sn].sflags & SDISTANT) |
97 |
|
return(FHUGE); |
98 |
+ |
if (si->dom <= 1e-4) |
99 |
+ |
goto nextsample; /* behind source? */ |
100 |
|
si->dom /= d*d; |
101 |
|
return(d); /* sample OK, return distance */ |
102 |
|
} |
168 |
|
return; |
169 |
|
} |
170 |
|
safedist2 *= 4.*r->rweight*r->rweight/(srcsizerat*srcsizerat); |
171 |
< |
if (dist2 <= 4.*rad2 || /* point too close to subdivide? */ |
172 |
< |
dist2cent >= safedist2) { /* too far? */ |
171 |
> |
if (dist2 <= 4.*rad2 || /* point too close to subdivide */ |
172 |
> |
dist2cent >= safedist2) { /* or too far */ |
173 |
|
setpart(si->spt, 0, S0); |
174 |
|
si->np = 1; |
175 |
|
return; |
221 |
|
|
222 |
|
flatpart(si, r) /* partition a flat source */ |
223 |
|
register SRCINDEX *si; |
224 |
< |
RAY *r; |
224 |
> |
register RAY *r; |
225 |
|
{ |
226 |
< |
register double *vp; |
226 |
> |
register FLOAT *vp; |
227 |
> |
FVECT v; |
228 |
|
double du2, dv2; |
229 |
|
int pi; |
230 |
|
|
231 |
+ |
clrpart(si->spt); |
232 |
+ |
vp = source[si->sn].sloc; |
233 |
+ |
v[0] = r->rorg[0] - vp[0]; |
234 |
+ |
v[1] = r->rorg[1] - vp[1]; |
235 |
+ |
v[2] = r->rorg[2] - vp[2]; |
236 |
+ |
vp = source[si->sn].snorm; |
237 |
+ |
if (DOT(v,vp) <= FTINY) { /* behind source */ |
238 |
+ |
si->np = 0; |
239 |
+ |
return; |
240 |
+ |
} |
241 |
|
dv2 = 2.*r->rweight/srcsizerat; |
242 |
|
dv2 *= dv2; |
243 |
|
vp = source[si->sn].ss[SU]; |
244 |
|
du2 = dv2 * DOT(vp,vp); |
245 |
|
vp = source[si->sn].ss[SV]; |
246 |
|
dv2 *= DOT(vp,vp); |
233 |
– |
clrpart(si->spt); |
247 |
|
pi = 0; |
248 |
|
si->np = flt_partit(r->rorg, si->spt, &pi, MAXSPART, |
249 |
|
source[si->sn].sloc, |
307 |
|
int sn; |
308 |
|
register FVECT dir; /* assume normalized */ |
309 |
|
{ |
310 |
< |
register double *dv; |
310 |
> |
register FLOAT *dv; |
311 |
|
double d; |
312 |
|
|
313 |
|
dv = source[sn].ss[SU]; |