1 |
greg |
2.4 |
/* Copyright (c) 1992 Regents of the University of California */ |
2 |
greg |
1.1 |
|
3 |
|
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#ifndef lint |
4 |
|
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static char SCCSid[] = "$SunId$ LBL"; |
5 |
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#endif |
6 |
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7 |
|
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/* |
8 |
|
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* source.c - routines dealing with illumination sources. |
9 |
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* |
10 |
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* 8/20/85 |
11 |
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*/ |
12 |
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13 |
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#include "ray.h" |
14 |
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|
15 |
greg |
1.4 |
#include "octree.h" |
16 |
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17 |
greg |
1.1 |
#include "otypes.h" |
18 |
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|
19 |
greg |
1.35 |
#include "source.h" |
20 |
greg |
1.1 |
|
21 |
greg |
1.35 |
/* |
22 |
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* Structures used by direct() |
23 |
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*/ |
24 |
greg |
1.1 |
|
25 |
greg |
1.35 |
typedef struct { |
26 |
greg |
1.45 |
int sno; /* source number */ |
27 |
greg |
1.35 |
FVECT dir; /* source direction */ |
28 |
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COLOR coef; /* material coefficient */ |
29 |
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COLOR val; /* contribution */ |
30 |
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} CONTRIB; /* direct contribution */ |
31 |
greg |
1.1 |
|
32 |
greg |
1.35 |
typedef struct { |
33 |
greg |
1.45 |
int sndx; /* source index (to CONTRIB array) */ |
34 |
greg |
1.35 |
float brt; /* brightness (for comparison) */ |
35 |
|
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} CNTPTR; /* contribution pointer */ |
36 |
greg |
1.1 |
|
37 |
greg |
1.25 |
static CONTRIB *srccnt; /* source contributions in direct() */ |
38 |
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static CNTPTR *cntord; /* source ordering in direct() */ |
39 |
greg |
1.45 |
static int maxcntr = 0; /* size of contribution arrays */ |
40 |
greg |
1.1 |
|
41 |
greg |
1.25 |
|
42 |
greg |
1.1 |
marksources() /* find and mark source objects */ |
43 |
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{ |
44 |
greg |
2.3 |
int foundsource = 0; |
45 |
greg |
1.33 |
int i; |
46 |
greg |
1.1 |
register OBJREC *o, *m; |
47 |
greg |
1.36 |
register int ns; |
48 |
greg |
1.35 |
/* initialize dispatch table */ |
49 |
|
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initstypes(); |
50 |
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/* find direct sources */ |
51 |
greg |
1.1 |
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 |
greg |
1.35 |
if (!issurface(o->otype) || o->omod == OVOID) |
56 |
greg |
1.1 |
continue; |
57 |
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58 |
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m = objptr(o->omod); |
59 |
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|
60 |
greg |
1.24 |
if (!islight(m->otype)) |
61 |
greg |
1.1 |
continue; |
62 |
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|
63 |
greg |
1.6 |
if (m->oargs.nfargs != (m->otype == MAT_GLOW ? 4 : |
64 |
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m->otype == MAT_SPOT ? 7 : 3)) |
65 |
greg |
1.1 |
objerror(m, USER, "bad # arguments"); |
66 |
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|
67 |
greg |
1.6 |
if (m->otype == MAT_GLOW && |
68 |
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o->otype != OBJ_SOURCE && |
69 |
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m->oargs.farg[3] <= FTINY) |
70 |
greg |
1.1 |
continue; /* don't bother */ |
71 |
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72 |
greg |
1.35 |
if (sfun[o->otype].of == NULL || |
73 |
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sfun[o->otype].of->setsrc == NULL) |
74 |
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objerror(o, USER, "illegal material"); |
75 |
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|
76 |
greg |
1.36 |
if ((ns = newsource()) < 0) |
77 |
greg |
1.25 |
goto memerr; |
78 |
greg |
1.1 |
|
79 |
greg |
1.37 |
setsource(&source[ns], o); |
80 |
greg |
1.1 |
|
81 |
greg |
1.6 |
if (m->otype == MAT_GLOW) { |
82 |
greg |
1.36 |
source[ns].sflags |= SPROX; |
83 |
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source[ns].sl.prox = m->oargs.farg[3]; |
84 |
greg |
1.6 |
if (o->otype == OBJ_SOURCE) |
85 |
greg |
1.36 |
source[ns].sflags |= SSKIP; |
86 |
greg |
1.6 |
} else if (m->otype == MAT_SPOT) { |
87 |
greg |
1.36 |
source[ns].sflags |= SSPOT; |
88 |
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if ((source[ns].sl.s = makespot(m)) == NULL) |
89 |
greg |
1.33 |
goto memerr; |
90 |
greg |
1.38 |
if (source[ns].sflags & SFLAT && |
91 |
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!checkspot(source[ns].sl.s,source[ns].snorm)) { |
92 |
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objerror(o, WARNING, |
93 |
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"invalid spotlight direction"); |
94 |
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source[ns].sflags |= SSKIP; |
95 |
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} |
96 |
greg |
1.6 |
} |
97 |
greg |
2.3 |
if (!(source[ns].sflags & SSKIP)) |
98 |
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foundsource++; |
99 |
greg |
1.1 |
} |
100 |
greg |
2.3 |
if (!foundsource) { |
101 |
greg |
1.25 |
error(WARNING, "no light sources found"); |
102 |
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return; |
103 |
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} |
104 |
greg |
1.33 |
markvirtuals(); /* find and add virtual sources */ |
105 |
greg |
1.45 |
/* allocate our contribution arrays */ |
106 |
greg |
1.48 |
maxcntr = nsources + MAXSPART; /* start with this many */ |
107 |
greg |
1.45 |
srccnt = (CONTRIB *)malloc(maxcntr*sizeof(CONTRIB)); |
108 |
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cntord = (CNTPTR *)malloc(maxcntr*sizeof(CNTPTR)); |
109 |
greg |
1.48 |
if (srccnt == NULL | cntord == NULL) |
110 |
greg |
1.33 |
goto memerr; |
111 |
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return; |
112 |
greg |
1.25 |
memerr: |
113 |
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error(SYSTEM, "out of memory in marksources"); |
114 |
greg |
1.1 |
} |
115 |
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116 |
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|
117 |
greg |
1.45 |
srcray(sr, r, si) /* send a ray to a source, return domega */ |
118 |
greg |
1.1 |
register RAY *sr; /* returned source ray */ |
119 |
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RAY *r; /* ray which hit object */ |
120 |
greg |
1.45 |
SRCINDEX *si; /* source sample index */ |
121 |
greg |
1.1 |
{ |
122 |
greg |
1.45 |
double d; /* distance to source */ |
123 |
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register SRCREC *srcp; |
124 |
greg |
1.1 |
|
125 |
greg |
1.45 |
rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
126 |
greg |
1.1 |
|
127 |
greg |
1.47 |
while ((d = nextssamp(sr, si)) != 0.0) { |
128 |
greg |
1.45 |
sr->rsrc = si->sn; /* remember source */ |
129 |
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srcp = source + si->sn; |
130 |
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if (srcp->sflags & SDISTANT) { |
131 |
greg |
2.4 |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1)) |
132 |
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continue; |
133 |
greg |
1.45 |
return(1); /* sample OK */ |
134 |
greg |
1.40 |
} |
135 |
greg |
1.45 |
/* local source */ |
136 |
greg |
1.6 |
/* check proximity */ |
137 |
greg |
1.45 |
if (srcp->sflags & SPROX && d > srcp->sl.prox) |
138 |
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continue; |
139 |
greg |
1.6 |
/* check angle */ |
140 |
greg |
1.45 |
if (srcp->sflags & SSPOT) { |
141 |
greg |
2.4 |
if (spotout(sr, srcp->sl.s, 0)) |
142 |
greg |
1.45 |
continue; |
143 |
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/* adjust solid angle */ |
144 |
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si->dom *= d*d; |
145 |
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d += srcp->sl.s->flen; |
146 |
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si->dom /= d*d; |
147 |
greg |
1.1 |
} |
148 |
greg |
1.45 |
return(1); /* sample OK */ |
149 |
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} |
150 |
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return(0); /* no more samples */ |
151 |
greg |
1.1 |
} |
152 |
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153 |
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154 |
greg |
1.35 |
srcvalue(r) /* punch ray to source and compute value */ |
155 |
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RAY *r; |
156 |
greg |
1.1 |
{ |
157 |
greg |
1.35 |
register SRCREC *sp; |
158 |
greg |
1.1 |
|
159 |
greg |
1.35 |
sp = &source[r->rsrc]; |
160 |
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if (sp->sflags & SVIRTUAL) { /* virtual source */ |
161 |
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/* check intersection */ |
162 |
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if (!(*ofun[sp->so->otype].funp)(sp->so, r)) |
163 |
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return; |
164 |
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raycont(r); /* compute contribution */ |
165 |
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return; |
166 |
greg |
1.1 |
} |
167 |
greg |
1.35 |
/* compute intersection */ |
168 |
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if (sp->sflags & SDISTANT ? sourcehit(r) : |
169 |
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(*ofun[sp->so->otype].funp)(sp->so, r)) { |
170 |
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if (sp->sa.success >= 0) |
171 |
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sp->sa.success++; |
172 |
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raycont(r); /* compute contribution */ |
173 |
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return; |
174 |
greg |
1.1 |
} |
175 |
greg |
1.35 |
if (sp->sa.success < 0) |
176 |
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return; /* bitched already */ |
177 |
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sp->sa.success -= AIMREQT; |
178 |
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if (sp->sa.success >= 0) |
179 |
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return; /* leniency */ |
180 |
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sprintf(errmsg, "aiming failure for light source \"%s\"", |
181 |
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sp->so->oname); |
182 |
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error(WARNING, errmsg); /* issue warning */ |
183 |
greg |
1.1 |
} |
184 |
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185 |
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186 |
greg |
1.4 |
static int |
187 |
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cntcmp(sc1, sc2) /* contribution compare (descending) */ |
188 |
greg |
1.9 |
register CNTPTR *sc1, *sc2; |
189 |
greg |
1.4 |
{ |
190 |
|
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if (sc1->brt > sc2->brt) |
191 |
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return(-1); |
192 |
|
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if (sc1->brt < sc2->brt) |
193 |
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return(1); |
194 |
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return(0); |
195 |
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} |
196 |
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197 |
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198 |
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direct(r, f, p) /* add direct component */ |
199 |
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RAY *r; /* ray that hit surface */ |
200 |
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int (*f)(); /* direct component coefficient function */ |
201 |
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char *p; /* data for f */ |
202 |
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{ |
203 |
greg |
1.42 |
extern int (*trace)(); |
204 |
greg |
1.12 |
extern double pow(); |
205 |
greg |
1.4 |
register int sn; |
206 |
greg |
1.45 |
SRCINDEX si; |
207 |
greg |
1.12 |
int nshadcheck, ncnts; |
208 |
greg |
1.29 |
int nhits; |
209 |
greg |
1.45 |
double prob, ourthresh, hwt; |
210 |
greg |
1.4 |
RAY sr; |
211 |
greg |
1.25 |
/* NOTE: srccnt and cntord global so no recursion */ |
212 |
greg |
1.22 |
if (nsources <= 0) |
213 |
greg |
1.25 |
return; /* no sources?! */ |
214 |
greg |
1.4 |
/* potential contributions */ |
215 |
greg |
1.45 |
initsrcindex(&si); |
216 |
|
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for (sn = 0; srcray(&sr, r, &si); sn++) { |
217 |
|
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if (sn >= maxcntr) { |
218 |
|
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maxcntr = sn + MAXSPART; |
219 |
|
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srccnt = (CONTRIB *)realloc((char *)srccnt, |
220 |
|
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maxcntr*sizeof(CONTRIB)); |
221 |
|
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cntord = (CNTPTR *)realloc((char *)cntord, |
222 |
|
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maxcntr*sizeof(CNTPTR)); |
223 |
greg |
1.48 |
if (srccnt == NULL | cntord == NULL) |
224 |
greg |
1.45 |
error(SYSTEM, "out of memory in direct"); |
225 |
|
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} |
226 |
|
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cntord[sn].sndx = sn; |
227 |
greg |
1.46 |
srccnt[sn].sno = sr.rsrc; |
228 |
greg |
1.4 |
/* compute coefficient */ |
229 |
greg |
1.46 |
(*f)(srccnt[sn].coef, p, sr.rdir, si.dom); |
230 |
greg |
1.34 |
cntord[sn].brt = bright(srccnt[sn].coef); |
231 |
greg |
1.15 |
if (cntord[sn].brt <= 0.0) |
232 |
greg |
1.4 |
continue; |
233 |
greg |
1.45 |
VCOPY(srccnt[sn].dir, sr.rdir); |
234 |
greg |
1.35 |
/* compute potential */ |
235 |
|
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sr.revf = srcvalue; |
236 |
|
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rayvalue(&sr); |
237 |
greg |
1.34 |
copycolor(srccnt[sn].val, sr.rcol); |
238 |
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multcolor(srccnt[sn].val, srccnt[sn].coef); |
239 |
greg |
1.9 |
cntord[sn].brt = bright(srccnt[sn].val); |
240 |
greg |
1.4 |
} |
241 |
|
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/* sort contributions */ |
242 |
greg |
1.45 |
qsort(cntord, sn, sizeof(CNTPTR), cntcmp); |
243 |
greg |
1.13 |
{ /* find last */ |
244 |
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register int l, m; |
245 |
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|
246 |
greg |
1.45 |
ncnts = l = sn; |
247 |
|
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sn = 0; |
248 |
greg |
1.13 |
while ((m = (sn + ncnts) >> 1) != l) { |
249 |
|
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if (cntord[m].brt > 0.0) |
250 |
|
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sn = m; |
251 |
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else |
252 |
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ncnts = m; |
253 |
|
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l = m; |
254 |
|
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} |
255 |
|
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} |
256 |
greg |
2.2 |
if (ncnts == 0) |
257 |
|
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return; /* no contributions! */ |
258 |
greg |
1.12 |
/* accumulate tail */ |
259 |
|
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for (sn = ncnts-1; sn > 0; sn--) |
260 |
|
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cntord[sn-1].brt += cntord[sn].brt; |
261 |
greg |
1.45 |
/* compute number to check */ |
262 |
|
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nshadcheck = pow((double)ncnts, shadcert) + .5; |
263 |
|
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/* modify threshold */ |
264 |
|
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ourthresh = shadthresh / r->rweight; |
265 |
greg |
1.10 |
/* test for shadows */ |
266 |
greg |
1.29 |
nhits = 0; |
267 |
greg |
1.12 |
for (sn = 0; sn < ncnts; sn++) { |
268 |
greg |
1.10 |
/* check threshold */ |
269 |
greg |
1.12 |
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
270 |
greg |
1.27 |
cntord[sn].brt-cntord[sn+nshadcheck].brt) |
271 |
|
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< ourthresh*bright(r->rcol)) |
272 |
greg |
1.4 |
break; |
273 |
|
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/* test for hit */ |
274 |
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rayorigin(&sr, r, SHADOW, 1.0); |
275 |
greg |
1.45 |
VCOPY(sr.rdir, srccnt[cntord[sn].sndx].dir); |
276 |
|
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sr.rsrc = srccnt[cntord[sn].sndx].sno; |
277 |
|
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source[sr.rsrc].ntests++; /* keep statistics */ |
278 |
greg |
1.4 |
if (localhit(&sr, &thescene) && |
279 |
greg |
1.45 |
( sr.ro != source[sr.rsrc].so || |
280 |
|
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source[sr.rsrc].sflags & SFOLLOW )) { |
281 |
greg |
1.33 |
/* follow entire path */ |
282 |
greg |
1.19 |
raycont(&sr); |
283 |
greg |
1.42 |
if (trace != NULL) |
284 |
|
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(*trace)(&sr); /* trace execution */ |
285 |
greg |
1.5 |
if (bright(sr.rcol) <= FTINY) |
286 |
greg |
1.4 |
continue; /* missed! */ |
287 |
greg |
1.45 |
copycolor(srccnt[cntord[sn].sndx].val, sr.rcol); |
288 |
|
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multcolor(srccnt[cntord[sn].sndx].val, |
289 |
|
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srccnt[cntord[sn].sndx].coef); |
290 |
greg |
1.4 |
} |
291 |
|
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/* add contribution if hit */ |
292 |
greg |
1.45 |
addcolor(r->rcol, srccnt[cntord[sn].sndx].val); |
293 |
greg |
1.29 |
nhits++; |
294 |
greg |
1.45 |
source[sr.rsrc].nhits++; |
295 |
greg |
1.4 |
} |
296 |
greg |
1.29 |
/* surface hit rate */ |
297 |
|
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if (sn > 0) |
298 |
|
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hwt = (double)nhits / (double)sn; |
299 |
|
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else |
300 |
|
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hwt = 0.5; |
301 |
greg |
1.20 |
#ifdef DEBUG |
302 |
greg |
1.12 |
sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
303 |
|
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sn, ncnts-sn, hwt); |
304 |
|
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eputs(errmsg); |
305 |
greg |
1.4 |
#endif |
306 |
|
|
/* add in untested sources */ |
307 |
greg |
1.12 |
for ( ; sn < ncnts; sn++) { |
308 |
greg |
1.45 |
sr.rsrc = srccnt[cntord[sn].sndx].sno; |
309 |
|
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prob = hwt * (double)source[sr.rsrc].nhits / |
310 |
|
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(double)source[sr.rsrc].ntests; |
311 |
|
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scalecolor(srccnt[cntord[sn].sndx].val, prob); |
312 |
|
|
addcolor(r->rcol, srccnt[cntord[sn].sndx].val); |
313 |
greg |
1.1 |
} |
314 |
greg |
2.4 |
} |
315 |
|
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|
316 |
|
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|
317 |
|
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/**************************************************************** |
318 |
|
|
* The following macros were separated from the m_light() routine |
319 |
|
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* because they are very nasty and difficult to understand. |
320 |
|
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*/ |
321 |
|
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|
322 |
|
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/* wrongillum * |
323 |
|
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* |
324 |
|
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* We cannot allow an illum to pass to another illum, because that |
325 |
|
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* would almost certainly constitute overcounting. |
326 |
|
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* However, we do allow an illum to pass to another illum |
327 |
|
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* that is actually going to relay to a virtual light source. |
328 |
|
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*/ |
329 |
|
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|
330 |
|
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#define wrongillum(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
331 |
|
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objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM) |
332 |
|
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|
333 |
|
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/* wrongsource * |
334 |
|
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* |
335 |
|
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* This source is the wrong source (ie. overcounted) if we are |
336 |
|
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* aimed to a different source than the one we hit and the one |
337 |
|
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* we hit is not an illum which should be passed. |
338 |
|
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*/ |
339 |
|
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|
340 |
|
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#define wrongsource(m, r) (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \ |
341 |
|
|
(m->otype!=MAT_ILLUM || wrongillum(m,r))) |
342 |
|
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|
343 |
|
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/* distglow * |
344 |
|
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* |
345 |
|
|
* A distant glow is an object that sometimes acts as a light source, |
346 |
|
|
* but is too far away from the test point to be one in this case. |
347 |
|
|
*/ |
348 |
|
|
|
349 |
|
|
#define distglow(m, r) (m->otype==MAT_GLOW && \ |
350 |
|
|
r->rot > m->oargs.farg[3]) |
351 |
|
|
|
352 |
|
|
/* badcomponent * |
353 |
|
|
* |
354 |
|
|
* We must avoid counting light sources in the ambient calculation, |
355 |
|
|
* since the direct component is handled separately. Therefore, any |
356 |
|
|
* ambient ray which hits an active light source must be discarded. |
357 |
|
|
* The same is true for stray specular samples, since the specular |
358 |
|
|
* contribution from light sources is calculated separately. |
359 |
|
|
*/ |
360 |
|
|
|
361 |
|
|
#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
362 |
|
|
!(r->crtype&SHADOW || r->rod < 0.0 || \ |
363 |
|
|
distglow(m, r))) |
364 |
|
|
|
365 |
|
|
/* overcount * |
366 |
|
|
* |
367 |
|
|
* All overcounting possibilities are contained here. |
368 |
|
|
*/ |
369 |
|
|
|
370 |
|
|
#define overcount(m, r) (badcomponent(m,r) || wrongsource(m,r)) |
371 |
|
|
|
372 |
|
|
/* passillum * |
373 |
|
|
* |
374 |
|
|
* An illum passes to another material type when we didn't hit it |
375 |
|
|
* on purpose (as part of a direct calculation), or it is relaying |
376 |
|
|
* a virtual light source. |
377 |
|
|
*/ |
378 |
|
|
|
379 |
|
|
#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
380 |
|
|
(r->rsrc<0 || source[r->rsrc].so!=r->ro || \ |
381 |
|
|
source[r->rsrc].sflags&SVIRTUAL)) |
382 |
|
|
|
383 |
|
|
/* srcignore * |
384 |
|
|
* |
385 |
|
|
* The -di flag renders light sources invisible, and here is the test. |
386 |
|
|
*/ |
387 |
|
|
|
388 |
|
|
#define srcignore(m, r) (directinvis && !(r->crtype&SHADOW) && \ |
389 |
|
|
!distglow(m, r)) |
390 |
|
|
|
391 |
|
|
|
392 |
|
|
m_light(m, r) /* ray hit a light source */ |
393 |
|
|
register OBJREC *m; |
394 |
|
|
register RAY *r; |
395 |
|
|
{ |
396 |
|
|
/* check for over-counting */ |
397 |
|
|
if (overcount(m, r)) |
398 |
|
|
return; |
399 |
|
|
/* check for passed illum */ |
400 |
|
|
if (passillum(m, r)) { |
401 |
|
|
if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
402 |
|
|
raytrans(r); |
403 |
|
|
else |
404 |
|
|
rayshade(r, modifier(m->oargs.sarg[0])); |
405 |
|
|
return; |
406 |
|
|
} |
407 |
|
|
/* otherwise treat as source */ |
408 |
|
|
/* check for behind */ |
409 |
|
|
if (r->rod < 0.0) |
410 |
|
|
return; |
411 |
|
|
/* check for invisibility */ |
412 |
|
|
if (srcignore(m, r)) |
413 |
|
|
return; |
414 |
|
|
/* check for outside spot */ |
415 |
|
|
if (m->otype==MAT_SPOT && spotout(r, (SPOT *)m->os, r->rot>=FHUGE)) |
416 |
|
|
return; |
417 |
|
|
/* get distribution pattern */ |
418 |
|
|
raytexture(r, m->omod); |
419 |
|
|
/* get source color */ |
420 |
|
|
setcolor(r->rcol, m->oargs.farg[0], |
421 |
|
|
m->oargs.farg[1], |
422 |
|
|
m->oargs.farg[2]); |
423 |
|
|
/* modify value */ |
424 |
|
|
multcolor(r->rcol, r->pcol); |
425 |
greg |
1.1 |
} |