16 |
|
#include "random.h" |
17 |
|
|
18 |
|
|
19 |
< |
static int cyl_partit(), flt_partit(); |
19 |
> |
int |
20 |
> |
srcskip( /* pre-emptive test for source to skip */ |
21 |
> |
int sn, |
22 |
> |
RAY *r |
23 |
> |
) |
24 |
> |
{ |
25 |
> |
SRCREC *sp = source + sn; |
26 |
|
|
27 |
+ |
if (sp->sflags & SSKIP) |
28 |
+ |
return(1); |
29 |
|
|
30 |
+ |
if ((sp->sflags & (SPROX|SDISTANT)) != SPROX) |
31 |
+ |
return(0); |
32 |
+ |
|
33 |
+ |
return(dist2(r->rorg, sp->sloc) > |
34 |
+ |
(sp->sl.prox + sp->srad)*(sp->sl.prox + sp->srad)); |
35 |
+ |
} |
36 |
+ |
|
37 |
|
double |
38 |
< |
nextssamp(r, si) /* compute sample for source, rtn. distance */ |
39 |
< |
register RAY *r; /* origin is read, direction is set */ |
40 |
< |
register SRCINDEX *si; /* source index (modified to current) */ |
38 |
> |
nextssamp( /* compute sample for source, rtn. distance */ |
39 |
> |
RAY *r, /* origin is read, direction is set */ |
40 |
> |
SRCINDEX *si /* source index (modified to current) */ |
41 |
> |
) |
42 |
|
{ |
43 |
|
int cent[3], size[3], parr[2]; |
44 |
< |
FVECT vpos; |
44 |
> |
SRCREC *srcp; |
45 |
> |
double vpos[3]; |
46 |
|
double d; |
47 |
< |
register int i; |
47 |
> |
int i; |
48 |
|
nextsample: |
49 |
|
while (++si->sp >= si->np) { /* get next sample */ |
50 |
|
if (++si->sn >= nsources) |
51 |
|
return(0.0); /* no more */ |
52 |
< |
if (source[si->sn].sflags & SSKIP) |
52 |
> |
if (srcskip(si->sn, r)) |
53 |
|
si->np = 0; |
54 |
|
else if (srcsizerat <= FTINY) |
55 |
|
nopart(si, r); |
68 |
|
if (!skipparts(cent, size, parr, si->spt)) |
69 |
|
error(CONSISTENCY, "bad source partition in nextssamp"); |
70 |
|
/* compute sample */ |
71 |
+ |
srcp = source + si->sn; |
72 |
|
if (dstrsrc > FTINY) { /* jitter sample */ |
73 |
|
dimlist[ndims] = si->sn + 8831; |
74 |
|
dimlist[ndims+1] = si->sp + 3109; |
75 |
|
d = urand(ilhash(dimlist,ndims+2)+samplendx); |
76 |
< |
if (source[si->sn].sflags & SFLAT) { |
76 |
> |
if (srcp->sflags & SFLAT) { |
77 |
|
multisamp(vpos, 2, d); |
78 |
|
vpos[SW] = 0.5; |
79 |
|
} else |
80 |
|
multisamp(vpos, 3, d); |
81 |
|
for (i = 0; i < 3; i++) |
82 |
|
vpos[i] = dstrsrc * (1. - 2.*vpos[i]) * |
83 |
< |
(double)size[i]/MAXSPART; |
83 |
> |
(double)size[i]*(1.0/MAXSPART); |
84 |
|
} else |
85 |
|
vpos[0] = vpos[1] = vpos[2] = 0.0; |
86 |
|
|
87 |
< |
for (i = 0; i < 3; i++) |
70 |
< |
vpos[i] += (double)cent[i]/MAXSPART; |
87 |
> |
VSUM(vpos, vpos, cent, 1.0/MAXSPART); |
88 |
|
/* avoid circular aiming failures */ |
89 |
< |
if (source[si->sn].sflags & SCIR) { |
89 |
> |
if ((srcp->sflags & SCIR) && (si->np > 1) | (dstrsrc > 0.7)) { |
90 |
|
FVECT trim; |
91 |
< |
double d; |
75 |
< |
if (source[si->sn].sflags & (SFLAT|SDISTANT)) { |
91 |
> |
if (srcp->sflags & (SFLAT|SDISTANT)) { |
92 |
|
d = 1.12837917; /* correct setflatss() */ |
93 |
|
trim[SU] = d*sqrt(1.0 - 0.5*vpos[SV]*vpos[SV]); |
94 |
|
trim[SV] = d*sqrt(1.0 - 0.5*vpos[SU]*vpos[SU]); |
101 |
|
d = vpos[SW]*vpos[SW]; |
102 |
|
if (d > trim[SW]) trim[SW] = d; |
103 |
|
trim[SU] += d; |
104 |
< |
d = 1.0/0.7236; /* correct sphsetsrc() */ |
105 |
< |
trim[SW] = trim[SV] = trim[SU] = |
106 |
< |
d*sqrt(trim[SW]/trim[SU]); |
104 |
> |
if (trim[SU] > FTINY*FTINY) { |
105 |
> |
d = 1.0/0.7236; /* correct sphsetsrc() */ |
106 |
> |
trim[SW] = trim[SV] = trim[SU] = |
107 |
> |
d*sqrt(trim[SW]/trim[SU]); |
108 |
> |
} else |
109 |
> |
trim[SW] = trim[SV] = trim[SU] = 0.0; |
110 |
|
} |
111 |
|
for (i = 0; i < 3; i++) |
112 |
|
vpos[i] *= trim[i]; |
113 |
|
} |
114 |
|
/* compute direction */ |
115 |
|
for (i = 0; i < 3; i++) |
116 |
< |
r->rdir[i] = source[si->sn].sloc[i] + |
117 |
< |
vpos[SU]*source[si->sn].ss[SU][i] + |
118 |
< |
vpos[SV]*source[si->sn].ss[SV][i] + |
119 |
< |
vpos[SW]*source[si->sn].ss[SW][i]; |
116 |
> |
r->rdir[i] = srcp->sloc[i] + |
117 |
> |
vpos[SU]*srcp->ss[SU][i] + |
118 |
> |
vpos[SV]*srcp->ss[SV][i] + |
119 |
> |
vpos[SW]*srcp->ss[SW][i]; |
120 |
|
|
121 |
< |
if (!(source[si->sn].sflags & SDISTANT)) |
122 |
< |
for (i = 0; i < 3; i++) |
104 |
< |
r->rdir[i] -= r->rorg[i]; |
121 |
> |
if (!(srcp->sflags & SDISTANT)) |
122 |
> |
VSUB(r->rdir, r->rdir, r->rorg); |
123 |
|
/* compute distance */ |
124 |
|
if ((d = normalize(r->rdir)) == 0.0) |
125 |
|
goto nextsample; /* at source! */ |
126 |
|
|
127 |
|
/* compute sample size */ |
128 |
< |
if (source[si->sn].sflags & SFLAT) { |
128 |
> |
if (srcp->sflags & SFLAT) { |
129 |
|
si->dom = sflatform(si->sn, r->rdir); |
130 |
< |
si->dom *= size[SU]*size[SV]/(MAXSPART*(double)MAXSPART); |
131 |
< |
} else if (source[si->sn].sflags & SCYL) { |
130 |
> |
si->dom *= size[SU]*size[SV]*(1.0/MAXSPART/MAXSPART); |
131 |
> |
} else if (srcp->sflags & SCYL) { |
132 |
|
si->dom = scylform(si->sn, r->rdir); |
133 |
< |
si->dom *= size[SU]/(double)MAXSPART; |
133 |
> |
si->dom *= size[SU]*(1.0/MAXSPART); |
134 |
|
} else { |
135 |
< |
si->dom = size[SU]*size[SV]*(double)size[SW] / |
136 |
< |
(MAXSPART*MAXSPART*(double)MAXSPART) ; |
135 |
> |
si->dom = size[SU]*size[SV]*(double)size[SW] * |
136 |
> |
(1.0/MAXSPART/MAXSPART/MAXSPART) ; |
137 |
|
} |
138 |
< |
if (source[si->sn].sflags & SDISTANT) { |
139 |
< |
si->dom *= source[si->sn].ss2; |
138 |
> |
if (srcp->sflags & SDISTANT) { |
139 |
> |
si->dom *= srcp->ss2; |
140 |
|
return(FHUGE); |
141 |
|
} |
142 |
|
if (si->dom <= 1e-4) |
143 |
|
goto nextsample; /* behind source? */ |
144 |
< |
si->dom *= source[si->sn].ss2/(d*d); |
144 |
> |
si->dom *= srcp->ss2/(d*d); |
145 |
|
return(d); /* sample OK, return distance */ |
146 |
|
} |
147 |
|
|
148 |
|
|
149 |
|
int |
150 |
< |
skipparts(ct, sz, pp, pt) /* skip to requested partition */ |
151 |
< |
int ct[3], sz[3]; /* center and size of partition (returned) */ |
152 |
< |
register int pp[2]; /* current index, number to skip (modified) */ |
153 |
< |
unsigned char *pt; /* partition array */ |
150 |
> |
skipparts( /* skip to requested partition */ |
151 |
> |
int ct[3], |
152 |
> |
int sz[3], /* center and size of partition (returned) */ |
153 |
> |
int pp[2], /* current index, number to skip (modified) */ |
154 |
> |
unsigned char *pt /* partition array */ |
155 |
> |
) |
156 |
|
{ |
157 |
< |
register int p; |
157 |
> |
int p; |
158 |
|
/* check this partition */ |
159 |
|
p = spart(pt, pp[0]); |
160 |
|
pp[0]++; |
182 |
|
|
183 |
|
|
184 |
|
void |
185 |
< |
nopart(si, r) /* single source partition */ |
186 |
< |
register SRCINDEX *si; |
187 |
< |
RAY *r; |
185 |
> |
nopart( /* single source partition */ |
186 |
> |
SRCINDEX *si, |
187 |
> |
RAY *r |
188 |
> |
) |
189 |
|
{ |
190 |
|
clrpart(si->spt); |
191 |
|
setpart(si->spt, 0, S0); |
193 |
|
} |
194 |
|
|
195 |
|
|
175 |
– |
void |
176 |
– |
cylpart(si, r) /* partition a cylinder */ |
177 |
– |
SRCINDEX *si; |
178 |
– |
register RAY *r; |
179 |
– |
{ |
180 |
– |
double dist2, safedist2, dist2cent, rad2; |
181 |
– |
FVECT v; |
182 |
– |
register SRCREC *sp; |
183 |
– |
int pi; |
184 |
– |
/* first check point location */ |
185 |
– |
clrpart(si->spt); |
186 |
– |
sp = source + si->sn; |
187 |
– |
rad2 = 1.365 * DOT(sp->ss[SV],sp->ss[SV]); |
188 |
– |
v[0] = r->rorg[0] - sp->sloc[0]; |
189 |
– |
v[1] = r->rorg[1] - sp->sloc[1]; |
190 |
– |
v[2] = r->rorg[2] - sp->sloc[2]; |
191 |
– |
dist2 = DOT(v,sp->ss[SU]); |
192 |
– |
safedist2 = DOT(sp->ss[SU],sp->ss[SU]); |
193 |
– |
dist2 *= dist2 / safedist2; |
194 |
– |
dist2cent = DOT(v,v); |
195 |
– |
dist2 = dist2cent - dist2; |
196 |
– |
if (dist2 <= rad2) { /* point inside extended cylinder */ |
197 |
– |
si->np = 0; |
198 |
– |
return; |
199 |
– |
} |
200 |
– |
safedist2 *= 4.*r->rweight*r->rweight/(srcsizerat*srcsizerat); |
201 |
– |
if (dist2 <= 4.*rad2 || /* point too close to subdivide */ |
202 |
– |
dist2cent >= safedist2) { /* or too far */ |
203 |
– |
setpart(si->spt, 0, S0); |
204 |
– |
si->np = 1; |
205 |
– |
return; |
206 |
– |
} |
207 |
– |
pi = 0; |
208 |
– |
si->np = cyl_partit(r->rorg, si->spt, &pi, MAXSPART, |
209 |
– |
sp->sloc, sp->ss[SU], safedist2); |
210 |
– |
} |
211 |
– |
|
212 |
– |
|
196 |
|
static int |
197 |
< |
cyl_partit(ro, pt, pi, mp, cent, axis, d2) /* slice a cylinder */ |
198 |
< |
FVECT ro; |
199 |
< |
unsigned char *pt; |
200 |
< |
register int *pi; |
201 |
< |
int mp; |
202 |
< |
FVECT cent, axis; |
203 |
< |
double d2; |
197 |
> |
cyl_partit( /* slice a cylinder */ |
198 |
> |
FVECT ro, |
199 |
> |
unsigned char *pt, |
200 |
> |
int *pi, |
201 |
> |
int mp, |
202 |
> |
FVECT cent, |
203 |
> |
FVECT axis, |
204 |
> |
double d2 |
205 |
> |
) |
206 |
|
{ |
207 |
|
FVECT newct, newax; |
208 |
|
int npl, npu; |
235 |
|
|
236 |
|
|
237 |
|
void |
238 |
< |
flatpart(si, r) /* partition a flat source */ |
239 |
< |
register SRCINDEX *si; |
240 |
< |
register RAY *r; |
238 |
> |
cylpart( /* partition a cylinder */ |
239 |
> |
SRCINDEX *si, |
240 |
> |
RAY *r |
241 |
> |
) |
242 |
|
{ |
243 |
< |
register RREAL *vp; |
243 |
> |
double dist2, safedist2, dist2cent, rad2; |
244 |
|
FVECT v; |
245 |
< |
double du2, dv2; |
245 |
> |
SRCREC *sp; |
246 |
|
int pi; |
247 |
< |
|
247 |
> |
/* first check point location */ |
248 |
|
clrpart(si->spt); |
249 |
< |
vp = source[si->sn].sloc; |
250 |
< |
v[0] = r->rorg[0] - vp[0]; |
251 |
< |
v[1] = r->rorg[1] - vp[1]; |
252 |
< |
v[2] = r->rorg[2] - vp[2]; |
253 |
< |
vp = source[si->sn].snorm; |
254 |
< |
if (DOT(v,vp) <= 0.) { /* behind source */ |
249 |
> |
sp = source + si->sn; |
250 |
> |
rad2 = 1.365 * DOT(sp->ss[SV],sp->ss[SV]); |
251 |
> |
v[0] = r->rorg[0] - sp->sloc[0]; |
252 |
> |
v[1] = r->rorg[1] - sp->sloc[1]; |
253 |
> |
v[2] = r->rorg[2] - sp->sloc[2]; |
254 |
> |
dist2 = DOT(v,sp->ss[SU]); |
255 |
> |
safedist2 = DOT(sp->ss[SU],sp->ss[SU]); |
256 |
> |
dist2 *= dist2 / safedist2; |
257 |
> |
dist2cent = DOT(v,v); |
258 |
> |
dist2 = dist2cent - dist2; |
259 |
> |
if (dist2 <= rad2) { /* point inside extended cylinder */ |
260 |
|
si->np = 0; |
261 |
|
return; |
262 |
|
} |
263 |
< |
dv2 = 2.*r->rweight/srcsizerat; |
264 |
< |
dv2 *= dv2; |
265 |
< |
vp = source[si->sn].ss[SU]; |
266 |
< |
du2 = dv2 * DOT(vp,vp); |
267 |
< |
vp = source[si->sn].ss[SV]; |
268 |
< |
dv2 *= DOT(vp,vp); |
263 |
> |
safedist2 *= 4.*r->rweight*r->rweight/(srcsizerat*srcsizerat); |
264 |
> |
if (dist2 <= 4.*rad2 || /* point too close to subdivide */ |
265 |
> |
dist2cent >= safedist2) { /* or too far */ |
266 |
> |
setpart(si->spt, 0, S0); |
267 |
> |
si->np = 1; |
268 |
> |
return; |
269 |
> |
} |
270 |
|
pi = 0; |
271 |
< |
si->np = flt_partit(r->rorg, si->spt, &pi, MAXSPART, |
272 |
< |
source[si->sn].sloc, |
281 |
< |
source[si->sn].ss[SU], source[si->sn].ss[SV], du2, dv2); |
271 |
> |
si->np = cyl_partit(r->rorg, si->spt, &pi, MAXSPART, |
272 |
> |
sp->sloc, sp->ss[SU], safedist2); |
273 |
|
} |
274 |
|
|
275 |
|
|
276 |
|
static int |
277 |
< |
flt_partit(ro, pt, pi, mp, cent, u, v, du2, dv2) /* partition flatty */ |
278 |
< |
FVECT ro; |
279 |
< |
unsigned char *pt; |
280 |
< |
register int *pi; |
281 |
< |
int mp; |
282 |
< |
FVECT cent, u, v; |
283 |
< |
double du2, dv2; |
277 |
> |
flt_partit( /* partition flatty */ |
278 |
> |
FVECT ro, |
279 |
> |
unsigned char *pt, |
280 |
> |
int *pi, |
281 |
> |
int mp, |
282 |
> |
FVECT cent, |
283 |
> |
FVECT u, |
284 |
> |
FVECT v, |
285 |
> |
double du2, |
286 |
> |
double dv2 |
287 |
> |
) |
288 |
|
{ |
289 |
|
double d2; |
290 |
|
FVECT newct, newax; |
328 |
|
} |
329 |
|
|
330 |
|
|
331 |
+ |
void |
332 |
+ |
flatpart( /* partition a flat source */ |
333 |
+ |
SRCINDEX *si, |
334 |
+ |
RAY *r |
335 |
+ |
) |
336 |
+ |
{ |
337 |
+ |
RREAL *vp; |
338 |
+ |
FVECT v; |
339 |
+ |
double du2, dv2; |
340 |
+ |
int pi; |
341 |
+ |
|
342 |
+ |
clrpart(si->spt); |
343 |
+ |
vp = source[si->sn].sloc; |
344 |
+ |
v[0] = r->rorg[0] - vp[0]; |
345 |
+ |
v[1] = r->rorg[1] - vp[1]; |
346 |
+ |
v[2] = r->rorg[2] - vp[2]; |
347 |
+ |
vp = source[si->sn].snorm; |
348 |
+ |
if (DOT(v,vp) <= 0.) { /* behind source */ |
349 |
+ |
si->np = 0; |
350 |
+ |
return; |
351 |
+ |
} |
352 |
+ |
dv2 = 2.*r->rweight/srcsizerat; |
353 |
+ |
dv2 *= dv2; |
354 |
+ |
vp = source[si->sn].ss[SU]; |
355 |
+ |
du2 = dv2 * DOT(vp,vp); |
356 |
+ |
vp = source[si->sn].ss[SV]; |
357 |
+ |
dv2 *= DOT(vp,vp); |
358 |
+ |
pi = 0; |
359 |
+ |
si->np = flt_partit(r->rorg, si->spt, &pi, MAXSPART, |
360 |
+ |
source[si->sn].sloc, |
361 |
+ |
source[si->sn].ss[SU], source[si->sn].ss[SV], du2, dv2); |
362 |
+ |
} |
363 |
+ |
|
364 |
+ |
|
365 |
|
double |
366 |
< |
scylform(sn, dir) /* compute cosine for cylinder's projection */ |
367 |
< |
int sn; |
368 |
< |
register FVECT dir; /* assume normalized */ |
366 |
> |
scylform( /* compute cosine for cylinder's projection */ |
367 |
> |
int sn, |
368 |
> |
FVECT dir /* assume normalized */ |
369 |
> |
) |
370 |
|
{ |
371 |
< |
register RREAL *dv; |
371 |
> |
RREAL *dv; |
372 |
|
double d; |
373 |
|
|
374 |
|
dv = source[sn].ss[SU]; |