8 |
|
* Source sampling routines |
9 |
|
*/ |
10 |
|
|
11 |
< |
#include "standard.h" |
11 |
> |
#include "ray.h" |
12 |
|
|
13 |
– |
#include "object.h" |
14 |
– |
|
13 |
|
#include "source.h" |
14 |
|
|
15 |
|
#include "random.h" |
16 |
|
|
17 |
|
|
20 |
– |
extern int dimlist[]; /* dimension list for distribution */ |
21 |
– |
extern int ndims; /* number of dimensions so far */ |
22 |
– |
extern int samplendx; /* index for this sample */ |
23 |
– |
|
24 |
– |
|
18 |
|
double |
19 |
< |
nextssamp(org, dir, si) /* compute sample for source, rtn. distance */ |
20 |
< |
FVECT org, dir; /* origin is read only, direction is set */ |
19 |
> |
nextssamp(r, si) /* compute sample for source, rtn. distance */ |
20 |
> |
register RAY *r; /* origin is read, direction is set */ |
21 |
|
register SRCINDEX *si; /* source index (modified to current) */ |
22 |
|
{ |
23 |
|
int cent[3], size[3], parr[2]; |
24 |
|
FVECT vpos; |
25 |
|
double d; |
26 |
|
register int i; |
27 |
< |
tryagain: |
27 |
> |
|
28 |
|
while (++si->sp >= si->np) { /* get next sample */ |
29 |
|
if (++si->sn >= nsources) |
30 |
|
return(0.0); /* no more */ |
31 |
|
if (srcsizerat <= FTINY) |
32 |
< |
nopart(si, org); |
32 |
> |
nopart(si, r); |
33 |
|
else { |
34 |
|
for (i = si->sn; source[i].sflags & SVIRTUAL; |
35 |
|
i = source[i].sa.sv.sn) |
36 |
|
; /* partition source */ |
37 |
< |
(*sfun[source[i].so->otype].of->partit)(si, org); |
37 |
> |
(*sfun[source[i].so->otype].of->partit)(si, r); |
38 |
|
} |
39 |
|
si->sp = -1; |
40 |
|
} |
64 |
|
vpos[i] += (double)cent[i]/MAXSPART; |
65 |
|
/* compute direction */ |
66 |
|
for (i = 0; i < 3; i++) |
67 |
< |
dir[i] = source[si->sn].sloc[i] + |
67 |
> |
r->rdir[i] = source[si->sn].sloc[i] + |
68 |
|
vpos[SU]*source[si->sn].ss[SU][i] + |
69 |
|
vpos[SV]*source[si->sn].ss[SV][i] + |
70 |
|
vpos[SW]*source[si->sn].ss[SW][i]; |
71 |
|
|
72 |
|
if (!(source[si->sn].sflags & SDISTANT)) |
73 |
|
for (i = 0; i < 3; i++) |
74 |
< |
dir[i] -= org[i]; |
74 |
> |
r->rdir[i] -= r->rorg[i]; |
75 |
|
/* compute distance */ |
76 |
< |
if ((d = normalize(dir)) == 0.0) |
77 |
< |
goto tryagain; /* at source! */ |
76 |
> |
if ((d = normalize(r->rdir)) == 0.0) |
77 |
> |
return(nextssamp(r, si)); /* at source! */ |
78 |
|
|
79 |
|
/* compute sample size */ |
80 |
|
si->dom = source[si->sn].ss2; |
81 |
|
if (source[si->sn].sflags & SFLAT) { |
82 |
< |
si->dom *= sflatform(si->sn, dir); |
90 |
< |
if (si->dom <= FTINY) { /* behind source */ |
91 |
< |
si->sp = si->np; |
92 |
< |
goto tryagain; |
93 |
< |
} |
82 |
> |
si->dom *= sflatform(si->sn, r->rdir); |
83 |
|
si->dom *= (double)(size[SU]*size[SV])/(MAXSPART*MAXSPART); |
84 |
|
} else if (source[si->sn].sflags & SCYL) { |
85 |
< |
si->dom *= scylform(si->sn, dir); |
85 |
> |
si->dom *= scylform(si->sn, r->rdir); |
86 |
|
si->dom *= (double)size[SU]/MAXSPART; |
87 |
|
} else { |
88 |
|
si->dom *= (double)(size[SU]*size[SV]*size[SW]) / |
126 |
|
} |
127 |
|
|
128 |
|
|
129 |
< |
nopart(si, ro) /* single source partition */ |
129 |
> |
nopart(si, r) /* single source partition */ |
130 |
|
register SRCINDEX *si; |
131 |
< |
FVECT ro; |
131 |
> |
RAY *r; |
132 |
|
{ |
133 |
|
clrpart(si->spt); |
134 |
|
setpart(si->spt, 0, S0); |
136 |
|
} |
137 |
|
|
138 |
|
|
139 |
< |
cylpart(si, ro) /* partition a cylinder */ |
139 |
> |
cylpart(si, r) /* partition a cylinder */ |
140 |
|
SRCINDEX *si; |
141 |
< |
FVECT ro; |
141 |
> |
register RAY *r; |
142 |
|
{ |
143 |
|
double dist2, safedist2, dist2cent, rad2; |
144 |
|
FVECT v; |
146 |
|
int pi; |
147 |
|
/* first check point location */ |
148 |
|
clrpart(si->spt); |
149 |
< |
sp = &source[si->sn]; |
150 |
< |
rad2 = 1.273 * DOT(sp->ss[SV],sp->ss[SV]); |
151 |
< |
v[0] = ro[0] - sp->sloc[0]; |
152 |
< |
v[1] = ro[1] - sp->sloc[1]; |
153 |
< |
v[2] = ro[2] - sp->sloc[2]; |
149 |
> |
sp = source + si->sn; |
150 |
> |
rad2 = 1.365 * DOT(sp->ss[SV],sp->ss[SV]); |
151 |
> |
v[0] = r->rorg[0] - sp->sloc[0]; |
152 |
> |
v[1] = r->rorg[1] - sp->sloc[1]; |
153 |
> |
v[2] = r->rorg[2] - sp->sloc[2]; |
154 |
|
dist2 = DOT(v,sp->ss[SU]); |
155 |
|
safedist2 = DOT(sp->ss[SU],sp->ss[SU]); |
156 |
|
dist2 *= dist2 / safedist2; |
160 |
|
si->np = 0; |
161 |
|
return; |
162 |
|
} |
163 |
< |
safedist2 *= 4./(srcsizerat*srcsizerat); |
164 |
< |
if (dist2 <= 4.*rad2 || /* point too close to subdivide? */ |
165 |
< |
dist2cent >= safedist2) { |
163 |
> |
safedist2 *= 4.*r->rweight*r->rweight/(srcsizerat*srcsizerat); |
164 |
> |
if (dist2 <= 4.*rad2 || /* point too close to subdivide */ |
165 |
> |
dist2cent >= safedist2) { /* or too far */ |
166 |
|
setpart(si->spt, 0, S0); |
167 |
|
si->np = 1; |
168 |
|
return; |
169 |
|
} |
170 |
|
pi = 0; |
171 |
< |
si->np = cyl_partit(ro, si->spt, &pi, MAXSPART, |
171 |
> |
si->np = cyl_partit(r->rorg, si->spt, &pi, MAXSPART, |
172 |
|
sp->sloc, sp->ss[SU], safedist2); |
173 |
|
} |
174 |
|
|
212 |
|
} |
213 |
|
|
214 |
|
|
215 |
< |
flatpart(si, ro) /* partition a flat source */ |
215 |
> |
flatpart(si, r) /* partition a flat source */ |
216 |
|
register SRCINDEX *si; |
217 |
< |
FVECT ro; |
217 |
> |
register RAY *r; |
218 |
|
{ |
219 |
< |
register double *vp; |
219 |
> |
register FLOAT *vp; |
220 |
> |
FVECT v; |
221 |
|
double du2, dv2; |
222 |
|
int pi; |
223 |
|
|
224 |
+ |
clrpart(si->spt); |
225 |
+ |
vp = source[si->sn].sloc; |
226 |
+ |
v[0] = r->rorg[0] - vp[0]; |
227 |
+ |
v[1] = r->rorg[1] - vp[1]; |
228 |
+ |
v[2] = r->rorg[2] - vp[2]; |
229 |
+ |
vp = source[si->sn].snorm; |
230 |
+ |
if (DOT(v,vp) <= FTINY) { /* behind source */ |
231 |
+ |
si->np = 0; |
232 |
+ |
return; |
233 |
+ |
} |
234 |
+ |
dv2 = 2.*r->rweight/srcsizerat; |
235 |
+ |
dv2 *= dv2; |
236 |
|
vp = source[si->sn].ss[SU]; |
237 |
< |
du2 = 4./(srcsizerat*srcsizerat) * DOT(vp,vp); |
237 |
> |
du2 = dv2 * DOT(vp,vp); |
238 |
|
vp = source[si->sn].ss[SV]; |
239 |
< |
dv2 = 4./(srcsizerat*srcsizerat) * DOT(vp,vp); |
238 |
< |
clrpart(si->spt); |
239 |
> |
dv2 *= DOT(vp,vp); |
240 |
|
pi = 0; |
241 |
< |
si->np = flt_partit(ro, si->spt, &pi, MAXSPART, source[si->sn].sloc, |
241 |
> |
si->np = flt_partit(r->rorg, si->spt, &pi, MAXSPART, |
242 |
> |
source[si->sn].sloc, |
243 |
|
source[si->sn].ss[SU], source[si->sn].ss[SV], du2, dv2); |
244 |
|
} |
245 |
|
|
300 |
|
int sn; |
301 |
|
register FVECT dir; /* assume normalized */ |
302 |
|
{ |
303 |
< |
register double *dv; |
303 |
> |
register FLOAT *dv; |
304 |
|
double d; |
305 |
|
|
306 |
|
dv = source[sn].ss[SU]; |