1 |
< |
/* Copyright (c) 1990 Regents of the University of California */ |
1 |
> |
/* Copyright (c) 1993 Regents of the University of California */ |
2 |
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3 |
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#ifndef lint |
4 |
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static char SCCSid[] = "$SunId$ LBL"; |
14 |
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|
15 |
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#include "octree.h" |
16 |
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|
17 |
– |
#include "source.h" |
18 |
– |
|
17 |
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#include "otypes.h" |
18 |
|
|
19 |
< |
#include "cone.h" |
19 |
> |
#include "source.h" |
20 |
|
|
21 |
< |
#include "face.h" |
21 |
> |
/* |
22 |
> |
* Structures used by direct() |
23 |
> |
*/ |
24 |
|
|
25 |
< |
#include "random.h" |
25 |
> |
typedef struct { |
26 |
> |
int sno; /* source number */ |
27 |
> |
FVECT dir; /* source direction */ |
28 |
> |
COLOR coef; /* material coefficient */ |
29 |
> |
COLOR val; /* contribution */ |
30 |
> |
} CONTRIB; /* direct contribution */ |
31 |
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|
32 |
+ |
typedef struct { |
33 |
+ |
int sndx; /* source index (to CONTRIB array) */ |
34 |
+ |
float brt; /* brightness (for comparison) */ |
35 |
+ |
} CNTPTR; /* contribution pointer */ |
36 |
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|
28 |
– |
extern double dstrsrc; /* source distribution amount */ |
29 |
– |
extern double shadthresh; /* relative shadow threshold */ |
30 |
– |
extern double shadcert; /* shadow testing certainty */ |
31 |
– |
|
32 |
– |
SRCREC *source = NULL; /* our list of sources */ |
33 |
– |
int nsources = 0; /* the number of sources */ |
34 |
– |
|
37 |
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static CONTRIB *srccnt; /* source contributions in direct() */ |
38 |
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static CNTPTR *cntord; /* source ordering in direct() */ |
39 |
+ |
static int maxcntr = 0; /* size of contribution arrays */ |
40 |
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|
41 |
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|
42 |
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marksources() /* find and mark source objects */ |
43 |
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{ |
44 |
+ |
int foundsource = 0; |
45 |
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int i; |
46 |
|
register OBJREC *o, *m; |
47 |
< |
register SRCREC *ns; |
48 |
< |
|
47 |
> |
register int ns; |
48 |
> |
/* initialize dispatch table */ |
49 |
> |
initstypes(); |
50 |
> |
/* find direct sources */ |
51 |
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for (i = 0; i < nobjects; i++) { |
52 |
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|
53 |
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o = objptr(i); |
54 |
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|
55 |
< |
if (o->omod == OVOID) |
55 |
> |
if (!issurface(o->otype) || o->omod == OVOID) |
56 |
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continue; |
57 |
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|
58 |
|
m = objptr(o->omod); |
69 |
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m->oargs.farg[3] <= FTINY) |
70 |
|
continue; /* don't bother */ |
71 |
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|
72 |
< |
if ((ns = newsource()) == NULL) |
72 |
> |
if (sfun[o->otype].of == NULL || |
73 |
> |
sfun[o->otype].of->setsrc == NULL) |
74 |
> |
objerror(o, USER, "illegal material"); |
75 |
> |
|
76 |
> |
if ((ns = newsource()) < 0) |
77 |
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goto memerr; |
78 |
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|
79 |
< |
setsource(ns, o); |
79 |
> |
setsource(&source[ns], o); |
80 |
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|
81 |
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if (m->otype == MAT_GLOW) { |
82 |
< |
ns->sflags |= SPROX; |
83 |
< |
ns->sl.prox = m->oargs.farg[3]; |
84 |
< |
if (o->otype == OBJ_SOURCE) |
85 |
< |
ns->sflags |= SSKIP; |
82 |
> |
source[ns].sflags |= SPROX; |
83 |
> |
source[ns].sl.prox = m->oargs.farg[3]; |
84 |
> |
if (source[ns].sflags & SDISTANT) |
85 |
> |
source[ns].sflags |= SSKIP; |
86 |
|
} else if (m->otype == MAT_SPOT) { |
87 |
< |
ns->sflags |= SSPOT; |
88 |
< |
if ((ns->sl.s = makespot(m)) == NULL) |
87 |
> |
source[ns].sflags |= SSPOT; |
88 |
> |
if ((source[ns].sl.s = makespot(m)) == NULL) |
89 |
|
goto memerr; |
90 |
+ |
if (source[ns].sflags & SFLAT && |
91 |
+ |
!checkspot(source[ns].sl.s,source[ns].snorm)) { |
92 |
+ |
objerror(o, WARNING, |
93 |
+ |
"invalid spotlight direction"); |
94 |
+ |
source[ns].sflags |= SSKIP; |
95 |
+ |
} |
96 |
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} |
97 |
+ |
if (!(source[ns].sflags & SSKIP)) |
98 |
+ |
foundsource++; |
99 |
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} |
100 |
< |
if (nsources <= 0) { |
100 |
> |
if (!foundsource) { |
101 |
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error(WARNING, "no light sources found"); |
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return; |
103 |
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} |
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markvirtuals(); /* find and add virtual sources */ |
105 |
< |
srccnt = (CONTRIB *)malloc(nsources*sizeof(CONTRIB)); |
106 |
< |
cntord = (CNTPTR *)malloc(nsources*sizeof(CNTPTR)); |
107 |
< |
if (srccnt != NULL && cntord != NULL) |
105 |
> |
/* allocate our contribution arrays */ |
106 |
> |
maxcntr = nsources + MAXSPART; /* start with this many */ |
107 |
> |
srccnt = (CONTRIB *)malloc(maxcntr*sizeof(CONTRIB)); |
108 |
> |
cntord = (CNTPTR *)malloc(maxcntr*sizeof(CNTPTR)); |
109 |
> |
if (srccnt == NULL | cntord == NULL) |
110 |
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goto memerr; |
111 |
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return; |
112 |
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memerr: |
114 |
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} |
115 |
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|
116 |
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|
117 |
< |
SRCREC * |
118 |
< |
newsource() /* allocate new source in our array */ |
117 |
> |
srcray(sr, r, si) /* send a ray to a source, return domega */ |
118 |
> |
register RAY *sr; /* returned source ray */ |
119 |
> |
RAY *r; /* ray which hit object */ |
120 |
> |
SRCINDEX *si; /* source sample index */ |
121 |
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{ |
122 |
< |
if (nsources == 0) |
123 |
< |
source = (SRCREC *)malloc(sizeof(SRCREC)); |
102 |
< |
else |
103 |
< |
source = (SRCREC *)realloc((char *)source, |
104 |
< |
(unsigned)(nsources+1)*sizeof(SRCREC)); |
105 |
< |
if (source == NULL) |
106 |
< |
return(NULL); |
107 |
< |
source[nsources].sflags = 0; |
108 |
< |
source[nsources].nhits = 1; |
109 |
< |
source[nsources].ntests = 2; /* initial hit probability = 1/2 */ |
110 |
< |
return(&source[nsources++]); |
111 |
< |
} |
122 |
> |
double d; /* distance to source */ |
123 |
> |
register SRCREC *srcp; |
124 |
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|
125 |
+ |
rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
126 |
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|
127 |
< |
setsource(src, so) /* add a source to the array */ |
128 |
< |
register SRCREC *src; |
129 |
< |
register OBJREC *so; |
130 |
< |
{ |
131 |
< |
double cos(), tan(), sqrt(); |
132 |
< |
double theta; |
133 |
< |
FACE *f; |
121 |
< |
CONE *co; |
122 |
< |
int j; |
123 |
< |
register int i; |
124 |
< |
|
125 |
< |
src->sa.success = 2*AIMREQT-1; /* bitch on second failure */ |
126 |
< |
src->so = so; |
127 |
< |
|
128 |
< |
switch (so->otype) { |
129 |
< |
case OBJ_SOURCE: |
130 |
< |
if (so->oargs.nfargs != 4) |
131 |
< |
objerror(so, USER, "bad arguments"); |
132 |
< |
src->sflags |= SDISTANT; |
133 |
< |
VCOPY(src->sloc, so->oargs.farg); |
134 |
< |
if (normalize(src->sloc) == 0.0) |
135 |
< |
objerror(so, USER, "zero direction"); |
136 |
< |
theta = PI/180.0/2.0 * so->oargs.farg[3]; |
137 |
< |
if (theta <= FTINY) |
138 |
< |
objerror(so, USER, "zero size"); |
139 |
< |
src->ss = theta >= PI/4 ? 1.0 : tan(theta); |
140 |
< |
src->ss2 = 2.0*PI * (1.0 - cos(theta)); |
141 |
< |
break; |
142 |
< |
case OBJ_SPHERE: |
143 |
< |
VCOPY(src->sloc, so->oargs.farg); |
144 |
< |
src->ss = so->oargs.farg[3]; |
145 |
< |
src->ss2 = PI * src->ss * src->ss; |
146 |
< |
break; |
147 |
< |
case OBJ_FACE: |
148 |
< |
/* get the face */ |
149 |
< |
f = getface(so); |
150 |
< |
/* find the center */ |
151 |
< |
for (j = 0; j < 3; j++) { |
152 |
< |
src->sloc[j] = 0.0; |
153 |
< |
for (i = 0; i < f->nv; i++) |
154 |
< |
src->sloc[j] += VERTEX(f,i)[j]; |
155 |
< |
src->sloc[j] /= (double)f->nv; |
156 |
< |
} |
157 |
< |
if (!inface(src->sloc, f)) |
158 |
< |
objerror(so, USER, "cannot hit center"); |
159 |
< |
src->sflags |= SFLAT; |
160 |
< |
VCOPY(src->snorm, f->norm); |
161 |
< |
src->ss = sqrt(f->area / PI); |
162 |
< |
src->ss2 = f->area; |
163 |
< |
break; |
164 |
< |
case OBJ_RING: |
165 |
< |
/* get the ring */ |
166 |
< |
co = getcone(so, 0); |
167 |
< |
VCOPY(src->sloc, CO_P0(co)); |
168 |
< |
if (CO_R0(co) > 0.0) |
169 |
< |
objerror(so, USER, "cannot hit center"); |
170 |
< |
src->sflags |= SFLAT; |
171 |
< |
VCOPY(src->snorm, co->ad); |
172 |
< |
src->ss = CO_R1(co); |
173 |
< |
src->ss2 = PI * src->ss * src->ss; |
174 |
< |
break; |
175 |
< |
default: |
176 |
< |
objerror(so, USER, "illegal material"); |
127 |
> |
while ((d = nextssamp(sr, si)) != 0.0) { |
128 |
> |
sr->rsrc = si->sn; /* remember source */ |
129 |
> |
srcp = source + si->sn; |
130 |
> |
if (srcp->sflags & SDISTANT) { |
131 |
> |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1)) |
132 |
> |
continue; |
133 |
> |
return(1); /* sample OK */ |
134 |
|
} |
135 |
+ |
/* local source */ |
136 |
+ |
/* check proximity */ |
137 |
+ |
if (srcp->sflags & SPROX && d > srcp->sl.prox) |
138 |
+ |
continue; |
139 |
+ |
/* check angle */ |
140 |
+ |
if (srcp->sflags & SSPOT) { |
141 |
+ |
if (spotout(sr, srcp->sl.s, 0)) |
142 |
+ |
continue; |
143 |
+ |
/* adjust solid angle */ |
144 |
+ |
si->dom *= d*d; |
145 |
+ |
d += srcp->sl.s->flen; |
146 |
+ |
si->dom /= d*d; |
147 |
+ |
} |
148 |
+ |
return(1); /* sample OK */ |
149 |
+ |
} |
150 |
+ |
return(0); /* no more samples */ |
151 |
|
} |
152 |
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|
153 |
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|
154 |
< |
SPOT * |
155 |
< |
makespot(m) /* make a spotlight */ |
183 |
< |
register OBJREC *m; |
154 |
> |
srcvalue(r) /* punch ray to source and compute value */ |
155 |
> |
RAY *r; |
156 |
|
{ |
157 |
< |
extern double cos(); |
186 |
< |
register SPOT *ns; |
157 |
> |
register SRCREC *sp; |
158 |
|
|
159 |
< |
if ((ns = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
160 |
< |
return(NULL); |
161 |
< |
ns->siz = 2.0*PI * (1.0 - cos(PI/180.0/2.0 * m->oargs.farg[3])); |
162 |
< |
VCOPY(ns->aim, m->oargs.farg+4); |
163 |
< |
if ((ns->flen = normalize(ns->aim)) == 0.0) |
164 |
< |
objerror(m, USER, "zero focus vector"); |
165 |
< |
return(ns); |
195 |
< |
} |
196 |
< |
|
197 |
< |
|
198 |
< |
double |
199 |
< |
srcray(sr, r, sn) /* send a ray to a source, return domega */ |
200 |
< |
register RAY *sr; /* returned source ray */ |
201 |
< |
RAY *r; /* ray which hit object */ |
202 |
< |
register int sn; /* source number */ |
203 |
< |
{ |
204 |
< |
double ddot; /* (distance times) cosine */ |
205 |
< |
FVECT vd; |
206 |
< |
double d; |
207 |
< |
register int i; |
208 |
< |
|
209 |
< |
if (source[sn].sflags & SSKIP) |
210 |
< |
return(0.0); /* skip this source */ |
211 |
< |
|
212 |
< |
rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
213 |
< |
|
214 |
< |
sr->rsrc = sn; /* remember source */ |
215 |
< |
/* get source direction */ |
216 |
< |
if (source[sn].sflags & SDISTANT) { |
217 |
< |
if (source[sn].sflags & SSPOT) { /* check location */ |
218 |
< |
for (i = 0; i < 3; i++) |
219 |
< |
vd[i] = sr->rorg[i] - source[sn].sl.s->aim[i]; |
220 |
< |
d = DOT(source[sn].sloc,vd); |
221 |
< |
d = DOT(vd,vd) - d*d; |
222 |
< |
if (PI*d > source[sn].sl.s->siz) |
223 |
< |
return(0.0); |
224 |
< |
} |
225 |
< |
/* constant direction */ |
226 |
< |
VCOPY(sr->rdir, source[sn].sloc); |
227 |
< |
} else { /* compute direction */ |
228 |
< |
for (i = 0; i < 3; i++) |
229 |
< |
sr->rdir[i] = source[sn].sloc[i] - sr->rorg[i]; |
230 |
< |
|
231 |
< |
if (source[sn].sflags & SFLAT && |
232 |
< |
(ddot = -DOT(sr->rdir, source[sn].snorm)) <= FTINY) |
233 |
< |
return(0.0); /* behind surface! */ |
159 |
> |
sp = &source[r->rsrc]; |
160 |
> |
if (sp->sflags & SVIRTUAL) { /* virtual source */ |
161 |
> |
/* check intersection */ |
162 |
> |
if (!(*ofun[sp->so->otype].funp)(sp->so, r)) |
163 |
> |
return; |
164 |
> |
raycont(r); /* compute contribution */ |
165 |
> |
return; |
166 |
|
} |
167 |
< |
if (dstrsrc > FTINY) { |
168 |
< |
/* distribute source direction */ |
169 |
< |
dimlist[ndims++] = sn; |
170 |
< |
for (i = 0; i < 3; i++) { |
171 |
< |
dimlist[ndims] = i + 8831; |
172 |
< |
vd[i] = dstrsrc * source[sn].ss * |
173 |
< |
(1.0 - 2.0*urand(ilhash(dimlist,ndims+1)+samplendx)); |
242 |
< |
} |
243 |
< |
ndims--; |
244 |
< |
if (source[sn].sflags & SFLAT) { /* project offset */ |
245 |
< |
d = DOT(vd, source[sn].snorm); |
246 |
< |
for (i = 0; i < 3; i++) |
247 |
< |
vd[i] -= d * source[sn].snorm[i]; |
248 |
< |
} |
249 |
< |
for (i = 0; i < 3; i++) /* offset source direction */ |
250 |
< |
sr->rdir[i] += vd[i]; |
251 |
< |
|
252 |
< |
} else if (source[sn].sflags & SDISTANT) |
253 |
< |
/* already normalized */ |
254 |
< |
return(source[sn].ss2); |
255 |
< |
|
256 |
< |
if ((d = normalize(sr->rdir)) == 0.0) |
257 |
< |
/* at source! */ |
258 |
< |
return(0.0); |
259 |
< |
|
260 |
< |
if (source[sn].sflags & SDISTANT) |
261 |
< |
/* domega constant */ |
262 |
< |
return(source[sn].ss2); |
263 |
< |
|
264 |
< |
/* check proximity */ |
265 |
< |
if (source[sn].sflags & SPROX && |
266 |
< |
d > source[sn].sl.prox) |
267 |
< |
return(0.0); |
268 |
< |
/* compute dot product */ |
269 |
< |
if (source[sn].sflags & SFLAT) |
270 |
< |
ddot /= d; |
271 |
< |
else |
272 |
< |
ddot = 1.0; |
273 |
< |
/* check angle */ |
274 |
< |
if (source[sn].sflags & SSPOT) { |
275 |
< |
if (source[sn].sl.s->siz < 2.0*PI * |
276 |
< |
(1.0 + DOT(source[sn].sl.s->aim,sr->rdir))) |
277 |
< |
return(0.0); |
278 |
< |
d += source[sn].sl.s->flen; /* adjust length */ |
167 |
> |
/* compute intersection */ |
168 |
> |
if (sp->sflags & SDISTANT ? sourcehit(r) : |
169 |
> |
(*ofun[sp->so->otype].funp)(sp->so, r)) { |
170 |
> |
if (sp->sa.success >= 0) |
171 |
> |
sp->sa.success++; |
172 |
> |
raycont(r); /* compute contribution */ |
173 |
> |
return; |
174 |
|
} |
175 |
< |
/* compute domega */ |
176 |
< |
return(ddot*source[sn].ss2/(d*d)); |
175 |
> |
if (sp->sa.success < 0) |
176 |
> |
return; /* bitched already */ |
177 |
> |
sp->sa.success -= AIMREQT; |
178 |
> |
if (sp->sa.success >= 0) |
179 |
> |
return; /* leniency */ |
180 |
> |
sprintf(errmsg, "aiming failure for light source \"%s\"", |
181 |
> |
sp->so->oname); |
182 |
> |
error(WARNING, errmsg); /* issue warning */ |
183 |
|
} |
184 |
|
|
185 |
|
|
195 |
|
first = 0; last = nsources-1; |
196 |
|
} |
197 |
|
for (i = first; i <= last; i++) |
198 |
< |
if (source[i].sflags & SDISTANT) |
198 |
> |
if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT) |
199 |
|
/* |
200 |
|
* Check to see if ray is within |
201 |
|
* solid angle of source. |
235 |
|
int (*f)(); /* direct component coefficient function */ |
236 |
|
char *p; /* data for f */ |
237 |
|
{ |
238 |
< |
extern double pow(); |
238 |
> |
extern int (*trace)(); |
239 |
|
register int sn; |
240 |
+ |
register CONTRIB *scp; |
241 |
+ |
SRCINDEX si; |
242 |
|
int nshadcheck, ncnts; |
243 |
|
int nhits; |
244 |
|
double prob, ourthresh, hwt; |
246 |
|
/* NOTE: srccnt and cntord global so no recursion */ |
247 |
|
if (nsources <= 0) |
248 |
|
return; /* no sources?! */ |
346 |
– |
/* compute number to check */ |
347 |
– |
nshadcheck = pow((double)nsources, shadcert) + .5; |
348 |
– |
/* modify threshold */ |
349 |
– |
ourthresh = shadthresh / r->rweight; |
249 |
|
/* potential contributions */ |
250 |
< |
for (sn = 0; sn < nsources; sn++) { |
251 |
< |
cntord[sn].sno = sn; |
252 |
< |
cntord[sn].brt = 0.0; |
253 |
< |
/* get source ray */ |
254 |
< |
if ((srccnt[sn].dom = srcray(&sr, r, sn)) == 0.0) |
255 |
< |
continue; |
256 |
< |
VCOPY(srccnt[sn].dir, sr.rdir); |
250 |
> |
initsrcindex(&si); |
251 |
> |
for (sn = 0; srcray(&sr, r, &si); sn++) { |
252 |
> |
if (sn >= maxcntr) { |
253 |
> |
maxcntr = sn + MAXSPART; |
254 |
> |
srccnt = (CONTRIB *)realloc((char *)srccnt, |
255 |
> |
maxcntr*sizeof(CONTRIB)); |
256 |
> |
cntord = (CNTPTR *)realloc((char *)cntord, |
257 |
> |
maxcntr*sizeof(CNTPTR)); |
258 |
> |
if (srccnt == NULL | cntord == NULL) |
259 |
> |
error(SYSTEM, "out of memory in direct"); |
260 |
> |
} |
261 |
> |
cntord[sn].sndx = sn; |
262 |
> |
scp = srccnt + sn; |
263 |
> |
scp->sno = sr.rsrc; |
264 |
|
/* compute coefficient */ |
265 |
< |
(*f)(srccnt[sn].val, p, srccnt[sn].dir, srccnt[sn].dom); |
266 |
< |
cntord[sn].brt = bright(srccnt[sn].val); |
265 |
> |
(*f)(scp->coef, p, sr.rdir, si.dom); |
266 |
> |
cntord[sn].brt = bright(scp->coef); |
267 |
|
if (cntord[sn].brt <= 0.0) |
268 |
|
continue; |
269 |
< |
/* compute contribution */ |
270 |
< |
srcvalue(&sr); |
271 |
< |
multcolor(srccnt[sn].val, sr.rcol); |
272 |
< |
cntord[sn].brt = bright(srccnt[sn].val); |
269 |
> |
VCOPY(scp->dir, sr.rdir); |
270 |
> |
/* compute potential */ |
271 |
> |
sr.revf = srcvalue; |
272 |
> |
rayvalue(&sr); |
273 |
> |
copycolor(scp->val, sr.rcol); |
274 |
> |
multcolor(scp->val, scp->coef); |
275 |
> |
cntord[sn].brt = bright(scp->val); |
276 |
|
} |
277 |
|
/* sort contributions */ |
278 |
< |
qsort(cntord, nsources, sizeof(CNTPTR), cntcmp); |
278 |
> |
qsort(cntord, sn, sizeof(CNTPTR), cntcmp); |
279 |
|
{ /* find last */ |
280 |
|
register int l, m; |
281 |
|
|
282 |
< |
sn = 0; ncnts = l = nsources; |
282 |
> |
ncnts = l = sn; |
283 |
> |
sn = 0; |
284 |
|
while ((m = (sn + ncnts) >> 1) != l) { |
285 |
|
if (cntord[m].brt > 0.0) |
286 |
|
sn = m; |
289 |
|
l = m; |
290 |
|
} |
291 |
|
} |
292 |
+ |
if (ncnts == 0) |
293 |
+ |
return; /* no contributions! */ |
294 |
|
/* accumulate tail */ |
295 |
|
for (sn = ncnts-1; sn > 0; sn--) |
296 |
|
cntord[sn-1].brt += cntord[sn].brt; |
297 |
+ |
/* compute number to check */ |
298 |
+ |
nshadcheck = pow((double)ncnts, shadcert) + .5; |
299 |
+ |
/* modify threshold */ |
300 |
+ |
ourthresh = shadthresh / r->rweight; |
301 |
|
/* test for shadows */ |
302 |
< |
nhits = 0; |
303 |
< |
for (sn = 0; sn < ncnts; sn++) { |
302 |
> |
for (nhits = 0, hwt = 0.0, sn = 0; sn < ncnts; |
303 |
> |
hwt += (double)source[scp->sno].nhits / |
304 |
> |
(double)source[scp->sno].ntests, |
305 |
> |
sn++) { |
306 |
|
/* check threshold */ |
307 |
|
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
308 |
|
cntord[sn].brt-cntord[sn+nshadcheck].brt) |
309 |
|
< ourthresh*bright(r->rcol)) |
310 |
|
break; |
311 |
< |
/* get statistics */ |
394 |
< |
source[cntord[sn].sno].ntests++; |
311 |
> |
scp = srccnt + cntord[sn].sndx; |
312 |
|
/* test for hit */ |
313 |
|
rayorigin(&sr, r, SHADOW, 1.0); |
314 |
< |
VCOPY(sr.rdir, srccnt[cntord[sn].sno].dir); |
315 |
< |
sr.rsrc = cntord[sn].sno; |
314 |
> |
VCOPY(sr.rdir, scp->dir); |
315 |
> |
sr.rsrc = scp->sno; |
316 |
> |
source[scp->sno].ntests++; /* keep statistics */ |
317 |
|
if (localhit(&sr, &thescene) && |
318 |
< |
( sr.ro != source[cntord[sn].sno].so || |
319 |
< |
source[cntord[sn].sno].sflags & SFOLLOW )) { |
318 |
> |
( sr.ro != source[scp->sno].so || |
319 |
> |
source[scp->sno].sflags & SFOLLOW )) { |
320 |
|
/* follow entire path */ |
321 |
|
raycont(&sr); |
322 |
+ |
if (trace != NULL) |
323 |
+ |
(*trace)(&sr); /* trace execution */ |
324 |
|
if (bright(sr.rcol) <= FTINY) |
325 |
|
continue; /* missed! */ |
326 |
< |
(*f)(srccnt[cntord[sn].sno].val, p, |
327 |
< |
srccnt[cntord[sn].sno].dir, |
408 |
< |
srccnt[cntord[sn].sno].dom); |
409 |
< |
multcolor(srccnt[cntord[sn].sno].val, sr.rcol); |
326 |
> |
copycolor(scp->val, sr.rcol); |
327 |
> |
multcolor(scp->val, scp->coef); |
328 |
|
} |
329 |
|
/* add contribution if hit */ |
330 |
< |
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
330 |
> |
addcolor(r->rcol, scp->val); |
331 |
|
nhits++; |
332 |
< |
source[cntord[sn].sno].nhits++; |
332 |
> |
source[scp->sno].nhits++; |
333 |
|
} |
334 |
< |
/* surface hit rate */ |
335 |
< |
if (sn > 0) |
336 |
< |
hwt = (double)nhits / (double)sn; |
334 |
> |
/* source hit rate */ |
335 |
> |
if (hwt > FTINY) |
336 |
> |
hwt = (double)nhits / hwt; |
337 |
|
else |
338 |
|
hwt = 0.5; |
339 |
|
#ifdef DEBUG |
340 |
< |
sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
340 |
> |
sprintf(errmsg, "%d tested, %d untested, %f conditional hit rate\n", |
341 |
|
sn, ncnts-sn, hwt); |
342 |
|
eputs(errmsg); |
343 |
|
#endif |
344 |
|
/* add in untested sources */ |
345 |
|
for ( ; sn < ncnts; sn++) { |
346 |
< |
prob = hwt * (double)source[cntord[sn].sno].nhits / |
347 |
< |
(double)source[cntord[sn].sno].ntests; |
348 |
< |
scalecolor(srccnt[cntord[sn].sno].val, prob); |
349 |
< |
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
346 |
> |
scp = srccnt + cntord[sn].sndx; |
347 |
> |
prob = hwt * (double)source[scp->sno].nhits / |
348 |
> |
(double)source[scp->sno].ntests; |
349 |
> |
if (prob > 1.0) |
350 |
> |
prob = 1.0; |
351 |
> |
scalecolor(scp->val, prob); |
352 |
> |
addcolor(r->rcol, scp->val); |
353 |
|
} |
354 |
|
} |
355 |
|
|
356 |
|
|
357 |
< |
srcvalue(r) /* punch ray to source and compute value */ |
358 |
< |
RAY *r; |
359 |
< |
{ |
360 |
< |
register SRCREC *sp; |
357 |
> |
/**************************************************************** |
358 |
> |
* The following macros were separated from the m_light() routine |
359 |
> |
* because they are very nasty and difficult to understand. |
360 |
> |
*/ |
361 |
|
|
362 |
< |
sp = &source[r->rsrc]; |
363 |
< |
if (sp->sflags & SVIRTUAL) { /* virtual source */ |
364 |
< |
RAY nr; |
365 |
< |
/* check intersection */ |
366 |
< |
if (!(*ofun[sp->so->otype].funp)(sp->so, r)) |
367 |
< |
return; |
368 |
< |
/* relay ray to source */ |
369 |
< |
vsrcrelay(&nr, r); |
370 |
< |
srcvalue(&nr); |
371 |
< |
return; |
451 |
< |
} |
452 |
< |
/* compute intersection */ |
453 |
< |
if (sp->sflags & SDISTANT ? sourcehit(r) : |
454 |
< |
(*ofun[sp->so->otype].funp)(sp->so, r)) { |
455 |
< |
if (sp->sa.success >= 0) |
456 |
< |
sp->sa.success++; |
457 |
< |
raycont(r); /* compute contribution */ |
458 |
< |
return; |
459 |
< |
} |
460 |
< |
if (sp->sa.success < 0) |
461 |
< |
return; /* bitched already */ |
462 |
< |
sp->sa.success -= AIMREQT; |
463 |
< |
if (sp->sa.success >= 0) |
464 |
< |
return; /* leniency */ |
465 |
< |
sprintf(errmsg, "aiming failure for light source \"%s\"", |
466 |
< |
sp->so->oname); |
467 |
< |
error(WARNING, errmsg); /* issue warning */ |
468 |
< |
} |
362 |
> |
/* illumblock * |
363 |
> |
* |
364 |
> |
* We cannot allow an illum to pass to another illum, because that |
365 |
> |
* would almost certainly constitute overcounting. |
366 |
> |
* However, we do allow an illum to pass to another illum |
367 |
> |
* that is actually going to relay to a virtual light source. |
368 |
> |
* We also prevent an illum from passing to a glow; this provides a |
369 |
> |
* convenient mechanism for defining detailed light source |
370 |
> |
* geometry behind (or inside) an effective radiator. |
371 |
> |
*/ |
372 |
|
|
373 |
+ |
static int weaksrcmod(obj) int obj; /* efficiency booster function */ |
374 |
+ |
{register OBJREC *o = objptr(obj); |
375 |
+ |
return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} |
376 |
|
|
377 |
< |
#define wrongsource(m, r) (m->otype!=MAT_ILLUM && \ |
378 |
< |
r->rsrc>=0 && \ |
379 |
< |
source[r->rsrc].so!=r->ro) |
377 |
> |
#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
378 |
> |
r->rod > 0.0 && \ |
379 |
> |
weaksrcmod(source[r->rsrc].so->omod)) |
380 |
|
|
381 |
< |
#define badambient(m, r) ((r->crtype&(AMBIENT|SHADOW))==AMBIENT && \ |
382 |
< |
!(m->otype==MAT_GLOW&&r->rot>m->oargs.farg[3])) |
381 |
> |
/* wrongsource * |
382 |
> |
* |
383 |
> |
* This source is the wrong source (ie. overcounted) if we are |
384 |
> |
* aimed to a different source than the one we hit and the one |
385 |
> |
* we hit is not an illum that should be passed. |
386 |
> |
*/ |
387 |
|
|
388 |
+ |
#define wrongsource(m, r) (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \ |
389 |
+ |
(m->otype!=MAT_ILLUM || illumblock(m,r))) |
390 |
+ |
|
391 |
+ |
/* distglow * |
392 |
+ |
* |
393 |
+ |
* A distant glow is an object that sometimes acts as a light source, |
394 |
+ |
* but is too far away from the test point to be one in this case. |
395 |
+ |
* (Glows with negative radii should NEVER participate in illumination.) |
396 |
+ |
*/ |
397 |
+ |
|
398 |
+ |
#define distglow(m, r) (m->otype==MAT_GLOW && \ |
399 |
+ |
m->oargs.farg[3] >= -FTINY && \ |
400 |
+ |
r->rot > m->oargs.farg[3]) |
401 |
+ |
|
402 |
+ |
/* badcomponent * |
403 |
+ |
* |
404 |
+ |
* We must avoid counting light sources in the ambient calculation, |
405 |
+ |
* since the direct component is handled separately. Therefore, any |
406 |
+ |
* ambient ray which hits an active light source must be discarded. |
407 |
+ |
* The same is true for stray specular samples, since the specular |
408 |
+ |
* contribution from light sources is calculated separately. |
409 |
+ |
*/ |
410 |
+ |
|
411 |
+ |
#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
412 |
+ |
!(r->crtype&SHADOW || r->rod < 0.0 || \ |
413 |
+ |
distglow(m, r))) |
414 |
+ |
|
415 |
+ |
/* passillum * |
416 |
+ |
* |
417 |
+ |
* An illum passes to another material type when we didn't hit it |
418 |
+ |
* on purpose (as part of a direct calculation), or it is relaying |
419 |
+ |
* a virtual light source. |
420 |
+ |
*/ |
421 |
+ |
|
422 |
|
#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
423 |
< |
!(r->rsrc>=0&&source[r->rsrc].so==r->ro)) |
423 |
> |
(r->rsrc<0 || source[r->rsrc].so!=r->ro || \ |
424 |
> |
source[r->rsrc].sflags&SVIRTUAL)) |
425 |
|
|
426 |
+ |
/* srcignore * |
427 |
+ |
* |
428 |
+ |
* The -dv flag is normally on for sources to be visible. |
429 |
+ |
*/ |
430 |
|
|
431 |
+ |
#define srcignore(m, r) (!directvis && !(r->crtype&SHADOW) && \ |
432 |
+ |
!distglow(m, r)) |
433 |
+ |
|
434 |
+ |
|
435 |
|
m_light(m, r) /* ray hit a light source */ |
436 |
|
register OBJREC *m; |
437 |
|
register RAY *r; |
438 |
|
{ |
439 |
|
/* check for over-counting */ |
440 |
< |
if (wrongsource(m, r) || badambient(m, r)) |
441 |
< |
return; |
440 |
> |
if (badcomponent(m, r)) |
441 |
> |
return(1); |
442 |
> |
if (wrongsource(m,r)) |
443 |
> |
return(1); |
444 |
|
/* check for passed illum */ |
445 |
|
if (passillum(m, r)) { |
446 |
< |
|
447 |
< |
if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
448 |
< |
raytrans(r); |
449 |
< |
else |
450 |
< |
rayshade(r, modifier(m->oargs.sarg[0])); |
451 |
< |
|
497 |
< |
/* otherwise treat as source */ |
498 |
< |
} else { |
446 |
> |
if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
447 |
> |
return(rayshade(r, modifier(m->oargs.sarg[0]))); |
448 |
> |
raytrans(r); |
449 |
> |
return(1); |
450 |
> |
} |
451 |
> |
/* otherwise treat as source */ |
452 |
|
/* check for behind */ |
453 |
< |
if (r->rod < 0.0) |
454 |
< |
return; |
453 |
> |
if (r->rod < 0.0) |
454 |
> |
return(1); |
455 |
> |
/* check for invisibility */ |
456 |
> |
if (srcignore(m, r)) |
457 |
> |
return(1); |
458 |
> |
/* check for outside spot */ |
459 |
> |
if (m->otype==MAT_SPOT && spotout(r, makespot(m), r->rot>=FHUGE)) |
460 |
> |
return(1); |
461 |
|
/* get distribution pattern */ |
462 |
< |
raytexture(r, m->omod); |
462 |
> |
raytexture(r, m->omod); |
463 |
|
/* get source color */ |
464 |
< |
setcolor(r->rcol, m->oargs.farg[0], |
465 |
< |
m->oargs.farg[1], |
466 |
< |
m->oargs.farg[2]); |
464 |
> |
setcolor(r->rcol, m->oargs.farg[0], |
465 |
> |
m->oargs.farg[1], |
466 |
> |
m->oargs.farg[2]); |
467 |
|
/* modify value */ |
468 |
< |
multcolor(r->rcol, r->pcol); |
469 |
< |
} |
468 |
> |
multcolor(r->rcol, r->pcol); |
469 |
> |
return(1); |
470 |
|
} |