1 |
greg |
2.17 |
/* Copyright (c) 1995 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 |
greg |
2.16 |
if (m->oargs.farg[0] <= FTINY && m->oargs.farg[1] <= FTINY && |
72 |
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m->oargs.farg[2] <= FTINY) |
73 |
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continue; /* don't bother */ |
74 |
greg |
1.1 |
|
75 |
greg |
1.35 |
if (sfun[o->otype].of == NULL || |
76 |
|
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sfun[o->otype].of->setsrc == NULL) |
77 |
|
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objerror(o, USER, "illegal material"); |
78 |
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|
79 |
greg |
1.36 |
if ((ns = newsource()) < 0) |
80 |
greg |
1.25 |
goto memerr; |
81 |
greg |
1.1 |
|
82 |
greg |
1.37 |
setsource(&source[ns], o); |
83 |
greg |
1.1 |
|
84 |
greg |
1.6 |
if (m->otype == MAT_GLOW) { |
85 |
greg |
1.36 |
source[ns].sflags |= SPROX; |
86 |
|
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source[ns].sl.prox = m->oargs.farg[3]; |
87 |
greg |
2.8 |
if (source[ns].sflags & SDISTANT) |
88 |
greg |
1.36 |
source[ns].sflags |= SSKIP; |
89 |
greg |
1.6 |
} else if (m->otype == MAT_SPOT) { |
90 |
greg |
1.36 |
source[ns].sflags |= SSPOT; |
91 |
|
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if ((source[ns].sl.s = makespot(m)) == NULL) |
92 |
greg |
1.33 |
goto memerr; |
93 |
greg |
1.38 |
if (source[ns].sflags & SFLAT && |
94 |
|
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!checkspot(source[ns].sl.s,source[ns].snorm)) { |
95 |
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objerror(o, WARNING, |
96 |
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"invalid spotlight direction"); |
97 |
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source[ns].sflags |= SSKIP; |
98 |
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} |
99 |
greg |
1.6 |
} |
100 |
greg |
2.3 |
if (!(source[ns].sflags & SSKIP)) |
101 |
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foundsource++; |
102 |
greg |
1.1 |
} |
103 |
greg |
2.3 |
if (!foundsource) { |
104 |
greg |
1.25 |
error(WARNING, "no light sources found"); |
105 |
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return; |
106 |
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} |
107 |
greg |
1.33 |
markvirtuals(); /* find and add virtual sources */ |
108 |
greg |
1.45 |
/* allocate our contribution arrays */ |
109 |
greg |
1.48 |
maxcntr = nsources + MAXSPART; /* start with this many */ |
110 |
greg |
1.45 |
srccnt = (CONTRIB *)malloc(maxcntr*sizeof(CONTRIB)); |
111 |
|
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cntord = (CNTPTR *)malloc(maxcntr*sizeof(CNTPTR)); |
112 |
greg |
1.48 |
if (srccnt == NULL | cntord == NULL) |
113 |
greg |
1.33 |
goto memerr; |
114 |
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return; |
115 |
greg |
1.25 |
memerr: |
116 |
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error(SYSTEM, "out of memory in marksources"); |
117 |
greg |
1.1 |
} |
118 |
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|
119 |
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|
120 |
greg |
1.45 |
srcray(sr, r, si) /* send a ray to a source, return domega */ |
121 |
greg |
1.1 |
register RAY *sr; /* returned source ray */ |
122 |
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RAY *r; /* ray which hit object */ |
123 |
greg |
1.45 |
SRCINDEX *si; /* source sample index */ |
124 |
greg |
1.1 |
{ |
125 |
greg |
1.45 |
double d; /* distance to source */ |
126 |
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register SRCREC *srcp; |
127 |
greg |
1.1 |
|
128 |
greg |
1.45 |
rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
129 |
greg |
1.1 |
|
130 |
greg |
1.47 |
while ((d = nextssamp(sr, si)) != 0.0) { |
131 |
greg |
1.45 |
sr->rsrc = si->sn; /* remember source */ |
132 |
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srcp = source + si->sn; |
133 |
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if (srcp->sflags & SDISTANT) { |
134 |
greg |
2.4 |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1)) |
135 |
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continue; |
136 |
greg |
1.45 |
return(1); /* sample OK */ |
137 |
greg |
1.40 |
} |
138 |
greg |
1.45 |
/* local source */ |
139 |
greg |
1.6 |
/* check proximity */ |
140 |
greg |
1.45 |
if (srcp->sflags & SPROX && d > srcp->sl.prox) |
141 |
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continue; |
142 |
greg |
1.6 |
/* check angle */ |
143 |
greg |
1.45 |
if (srcp->sflags & SSPOT) { |
144 |
greg |
2.4 |
if (spotout(sr, srcp->sl.s, 0)) |
145 |
greg |
1.45 |
continue; |
146 |
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/* adjust solid angle */ |
147 |
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si->dom *= d*d; |
148 |
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d += srcp->sl.s->flen; |
149 |
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si->dom /= d*d; |
150 |
greg |
1.1 |
} |
151 |
greg |
1.45 |
return(1); /* sample OK */ |
152 |
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} |
153 |
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return(0); /* no more samples */ |
154 |
greg |
1.1 |
} |
155 |
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156 |
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|
157 |
greg |
1.35 |
srcvalue(r) /* punch ray to source and compute value */ |
158 |
greg |
2.15 |
register RAY *r; |
159 |
greg |
1.1 |
{ |
160 |
greg |
1.35 |
register SRCREC *sp; |
161 |
greg |
1.1 |
|
162 |
greg |
1.35 |
sp = &source[r->rsrc]; |
163 |
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if (sp->sflags & SVIRTUAL) { /* virtual source */ |
164 |
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/* check intersection */ |
165 |
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if (!(*ofun[sp->so->otype].funp)(sp->so, r)) |
166 |
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return; |
167 |
greg |
2.15 |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
168 |
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goto nomat; |
169 |
greg |
1.35 |
return; |
170 |
greg |
1.1 |
} |
171 |
greg |
1.35 |
/* compute intersection */ |
172 |
|
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if (sp->sflags & SDISTANT ? sourcehit(r) : |
173 |
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(*ofun[sp->so->otype].funp)(sp->so, r)) { |
174 |
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if (sp->sa.success >= 0) |
175 |
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sp->sa.success++; |
176 |
greg |
2.15 |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
177 |
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goto nomat; |
178 |
greg |
1.35 |
return; |
179 |
greg |
1.1 |
} |
180 |
greg |
2.15 |
/* we missed our mark! */ |
181 |
greg |
1.35 |
if (sp->sa.success < 0) |
182 |
|
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return; /* bitched already */ |
183 |
|
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sp->sa.success -= AIMREQT; |
184 |
|
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if (sp->sa.success >= 0) |
185 |
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return; /* leniency */ |
186 |
|
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sprintf(errmsg, "aiming failure for light source \"%s\"", |
187 |
|
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sp->so->oname); |
188 |
|
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error(WARNING, errmsg); /* issue warning */ |
189 |
greg |
2.15 |
return; |
190 |
|
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nomat: |
191 |
|
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objerror(r->ro, USER, "material not found"); |
192 |
greg |
1.1 |
} |
193 |
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|
194 |
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|
195 |
greg |
2.5 |
sourcehit(r) /* check to see if ray hit distant source */ |
196 |
|
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register RAY *r; |
197 |
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{ |
198 |
|
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int first, last; |
199 |
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register int i; |
200 |
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|
201 |
|
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if (r->rsrc >= 0) { /* check only one if aimed */ |
202 |
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first = last = r->rsrc; |
203 |
|
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} else { /* otherwise check all */ |
204 |
|
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first = 0; last = nsources-1; |
205 |
|
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} |
206 |
|
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for (i = first; i <= last; i++) |
207 |
|
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if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT) |
208 |
|
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/* |
209 |
|
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* Check to see if ray is within |
210 |
|
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* solid angle of source. |
211 |
|
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*/ |
212 |
|
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if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
213 |
|
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<= source[i].ss2) { |
214 |
|
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r->ro = source[i].so; |
215 |
|
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if (!(source[i].sflags & SSKIP)) |
216 |
|
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break; |
217 |
|
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} |
218 |
|
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|
219 |
|
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if (r->ro != NULL) { |
220 |
|
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for (i = 0; i < 3; i++) |
221 |
|
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r->ron[i] = -r->rdir[i]; |
222 |
|
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r->rod = 1.0; |
223 |
|
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r->rox = NULL; |
224 |
|
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return(1); |
225 |
|
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} |
226 |
|
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return(0); |
227 |
|
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} |
228 |
|
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|
229 |
|
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|
230 |
greg |
1.4 |
static int |
231 |
|
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cntcmp(sc1, sc2) /* contribution compare (descending) */ |
232 |
greg |
1.9 |
register CNTPTR *sc1, *sc2; |
233 |
greg |
1.4 |
{ |
234 |
|
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if (sc1->brt > sc2->brt) |
235 |
|
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return(-1); |
236 |
|
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if (sc1->brt < sc2->brt) |
237 |
|
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return(1); |
238 |
|
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return(0); |
239 |
|
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} |
240 |
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241 |
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|
242 |
|
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direct(r, f, p) /* add direct component */ |
243 |
|
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RAY *r; /* ray that hit surface */ |
244 |
|
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int (*f)(); /* direct component coefficient function */ |
245 |
|
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char *p; /* data for f */ |
246 |
|
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{ |
247 |
greg |
1.42 |
extern int (*trace)(); |
248 |
greg |
1.4 |
register int sn; |
249 |
greg |
2.7 |
register CONTRIB *scp; |
250 |
greg |
1.45 |
SRCINDEX si; |
251 |
greg |
1.12 |
int nshadcheck, ncnts; |
252 |
greg |
1.29 |
int nhits; |
253 |
greg |
1.45 |
double prob, ourthresh, hwt; |
254 |
greg |
1.4 |
RAY sr; |
255 |
greg |
1.25 |
/* NOTE: srccnt and cntord global so no recursion */ |
256 |
greg |
1.22 |
if (nsources <= 0) |
257 |
greg |
1.25 |
return; /* no sources?! */ |
258 |
greg |
1.4 |
/* potential contributions */ |
259 |
greg |
1.45 |
initsrcindex(&si); |
260 |
|
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for (sn = 0; srcray(&sr, r, &si); sn++) { |
261 |
|
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if (sn >= maxcntr) { |
262 |
|
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maxcntr = sn + MAXSPART; |
263 |
|
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srccnt = (CONTRIB *)realloc((char *)srccnt, |
264 |
|
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maxcntr*sizeof(CONTRIB)); |
265 |
|
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cntord = (CNTPTR *)realloc((char *)cntord, |
266 |
|
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maxcntr*sizeof(CNTPTR)); |
267 |
greg |
1.48 |
if (srccnt == NULL | cntord == NULL) |
268 |
greg |
1.45 |
error(SYSTEM, "out of memory in direct"); |
269 |
|
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} |
270 |
|
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cntord[sn].sndx = sn; |
271 |
greg |
2.7 |
scp = srccnt + sn; |
272 |
|
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scp->sno = sr.rsrc; |
273 |
greg |
1.4 |
/* compute coefficient */ |
274 |
greg |
2.7 |
(*f)(scp->coef, p, sr.rdir, si.dom); |
275 |
|
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cntord[sn].brt = bright(scp->coef); |
276 |
greg |
1.15 |
if (cntord[sn].brt <= 0.0) |
277 |
greg |
1.4 |
continue; |
278 |
greg |
2.7 |
VCOPY(scp->dir, sr.rdir); |
279 |
greg |
1.35 |
/* compute potential */ |
280 |
|
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sr.revf = srcvalue; |
281 |
|
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rayvalue(&sr); |
282 |
greg |
2.7 |
copycolor(scp->val, sr.rcol); |
283 |
|
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multcolor(scp->val, scp->coef); |
284 |
|
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cntord[sn].brt = bright(scp->val); |
285 |
greg |
1.4 |
} |
286 |
|
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/* sort contributions */ |
287 |
greg |
1.45 |
qsort(cntord, sn, sizeof(CNTPTR), cntcmp); |
288 |
greg |
1.13 |
{ /* find last */ |
289 |
|
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register int l, m; |
290 |
|
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|
291 |
greg |
1.45 |
ncnts = l = sn; |
292 |
|
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sn = 0; |
293 |
greg |
1.13 |
while ((m = (sn + ncnts) >> 1) != l) { |
294 |
|
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if (cntord[m].brt > 0.0) |
295 |
|
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sn = m; |
296 |
|
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else |
297 |
|
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ncnts = m; |
298 |
|
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l = m; |
299 |
|
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} |
300 |
|
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} |
301 |
greg |
2.2 |
if (ncnts == 0) |
302 |
|
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return; /* no contributions! */ |
303 |
greg |
1.12 |
/* accumulate tail */ |
304 |
|
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for (sn = ncnts-1; sn > 0; sn--) |
305 |
|
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cntord[sn-1].brt += cntord[sn].brt; |
306 |
greg |
1.45 |
/* compute number to check */ |
307 |
|
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nshadcheck = pow((double)ncnts, shadcert) + .5; |
308 |
|
|
/* modify threshold */ |
309 |
|
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ourthresh = shadthresh / r->rweight; |
310 |
greg |
1.10 |
/* test for shadows */ |
311 |
greg |
2.13 |
for (nhits = 0, hwt = 0.0, sn = 0; sn < ncnts; |
312 |
|
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hwt += (double)source[scp->sno].nhits / |
313 |
|
|
(double)source[scp->sno].ntests, |
314 |
|
|
sn++) { |
315 |
greg |
1.10 |
/* check threshold */ |
316 |
greg |
1.12 |
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
317 |
greg |
1.27 |
cntord[sn].brt-cntord[sn+nshadcheck].brt) |
318 |
|
|
< ourthresh*bright(r->rcol)) |
319 |
greg |
1.4 |
break; |
320 |
greg |
2.7 |
scp = srccnt + cntord[sn].sndx; |
321 |
greg |
1.4 |
/* test for hit */ |
322 |
|
|
rayorigin(&sr, r, SHADOW, 1.0); |
323 |
greg |
2.7 |
VCOPY(sr.rdir, scp->dir); |
324 |
|
|
sr.rsrc = scp->sno; |
325 |
|
|
source[scp->sno].ntests++; /* keep statistics */ |
326 |
greg |
1.4 |
if (localhit(&sr, &thescene) && |
327 |
greg |
2.7 |
( sr.ro != source[scp->sno].so || |
328 |
|
|
source[scp->sno].sflags & SFOLLOW )) { |
329 |
greg |
1.33 |
/* follow entire path */ |
330 |
greg |
2.15 |
if (!raycont(&sr)) |
331 |
|
|
objerror(sr.ro, USER, "material not found"); |
332 |
greg |
1.42 |
if (trace != NULL) |
333 |
|
|
(*trace)(&sr); /* trace execution */ |
334 |
greg |
1.5 |
if (bright(sr.rcol) <= FTINY) |
335 |
greg |
1.4 |
continue; /* missed! */ |
336 |
greg |
2.7 |
copycolor(scp->val, sr.rcol); |
337 |
|
|
multcolor(scp->val, scp->coef); |
338 |
greg |
1.4 |
} |
339 |
|
|
/* add contribution if hit */ |
340 |
greg |
2.7 |
addcolor(r->rcol, scp->val); |
341 |
greg |
1.29 |
nhits++; |
342 |
greg |
2.7 |
source[scp->sno].nhits++; |
343 |
greg |
1.4 |
} |
344 |
greg |
2.13 |
/* source hit rate */ |
345 |
|
|
if (hwt > FTINY) |
346 |
|
|
hwt = (double)nhits / hwt; |
347 |
greg |
1.29 |
else |
348 |
|
|
hwt = 0.5; |
349 |
greg |
1.20 |
#ifdef DEBUG |
350 |
greg |
2.13 |
sprintf(errmsg, "%d tested, %d untested, %f conditional hit rate\n", |
351 |
greg |
1.12 |
sn, ncnts-sn, hwt); |
352 |
|
|
eputs(errmsg); |
353 |
greg |
1.4 |
#endif |
354 |
|
|
/* add in untested sources */ |
355 |
greg |
1.12 |
for ( ; sn < ncnts; sn++) { |
356 |
greg |
2.7 |
scp = srccnt + cntord[sn].sndx; |
357 |
|
|
prob = hwt * (double)source[scp->sno].nhits / |
358 |
|
|
(double)source[scp->sno].ntests; |
359 |
greg |
2.13 |
if (prob > 1.0) |
360 |
|
|
prob = 1.0; |
361 |
greg |
2.7 |
scalecolor(scp->val, prob); |
362 |
|
|
addcolor(r->rcol, scp->val); |
363 |
greg |
1.1 |
} |
364 |
greg |
2.4 |
} |
365 |
|
|
|
366 |
|
|
|
367 |
|
|
/**************************************************************** |
368 |
|
|
* The following macros were separated from the m_light() routine |
369 |
|
|
* because they are very nasty and difficult to understand. |
370 |
|
|
*/ |
371 |
|
|
|
372 |
greg |
2.11 |
/* illumblock * |
373 |
greg |
2.4 |
* |
374 |
|
|
* We cannot allow an illum to pass to another illum, because that |
375 |
|
|
* would almost certainly constitute overcounting. |
376 |
|
|
* However, we do allow an illum to pass to another illum |
377 |
|
|
* that is actually going to relay to a virtual light source. |
378 |
greg |
2.11 |
* We also prevent an illum from passing to a glow; this provides a |
379 |
|
|
* convenient mechanism for defining detailed light source |
380 |
|
|
* geometry behind (or inside) an effective radiator. |
381 |
greg |
2.4 |
*/ |
382 |
|
|
|
383 |
greg |
2.11 |
static int weaksrcmod(obj) int obj; /* efficiency booster function */ |
384 |
|
|
{register OBJREC *o = objptr(obj); |
385 |
|
|
return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} |
386 |
greg |
2.4 |
|
387 |
greg |
2.11 |
#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
388 |
greg |
2.12 |
r->rod > 0.0 && \ |
389 |
greg |
2.11 |
weaksrcmod(source[r->rsrc].so->omod)) |
390 |
|
|
|
391 |
greg |
2.4 |
/* wrongsource * |
392 |
|
|
* |
393 |
|
|
* This source is the wrong source (ie. overcounted) if we are |
394 |
|
|
* aimed to a different source than the one we hit and the one |
395 |
greg |
2.11 |
* we hit is not an illum that should be passed. |
396 |
greg |
2.4 |
*/ |
397 |
|
|
|
398 |
|
|
#define wrongsource(m, r) (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \ |
399 |
greg |
2.11 |
(m->otype!=MAT_ILLUM || illumblock(m,r))) |
400 |
greg |
2.4 |
|
401 |
|
|
/* distglow * |
402 |
|
|
* |
403 |
|
|
* A distant glow is an object that sometimes acts as a light source, |
404 |
|
|
* but is too far away from the test point to be one in this case. |
405 |
greg |
2.11 |
* (Glows with negative radii should NEVER participate in illumination.) |
406 |
greg |
2.4 |
*/ |
407 |
|
|
|
408 |
greg |
2.17 |
#define distglow(m, r, d) (m->otype==MAT_GLOW && \ |
409 |
greg |
2.10 |
m->oargs.farg[3] >= -FTINY && \ |
410 |
greg |
2.17 |
d > m->oargs.farg[3]) |
411 |
greg |
2.4 |
|
412 |
|
|
/* badcomponent * |
413 |
|
|
* |
414 |
|
|
* We must avoid counting light sources in the ambient calculation, |
415 |
|
|
* since the direct component is handled separately. Therefore, any |
416 |
|
|
* ambient ray which hits an active light source must be discarded. |
417 |
|
|
* The same is true for stray specular samples, since the specular |
418 |
|
|
* contribution from light sources is calculated separately. |
419 |
|
|
*/ |
420 |
|
|
|
421 |
|
|
#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
422 |
|
|
!(r->crtype&SHADOW || r->rod < 0.0 || \ |
423 |
greg |
2.17 |
/* not 100% correct */ distglow(m, r, r->rot))) |
424 |
greg |
2.4 |
|
425 |
|
|
/* passillum * |
426 |
|
|
* |
427 |
|
|
* An illum passes to another material type when we didn't hit it |
428 |
|
|
* on purpose (as part of a direct calculation), or it is relaying |
429 |
|
|
* a virtual light source. |
430 |
|
|
*/ |
431 |
|
|
|
432 |
|
|
#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
433 |
|
|
(r->rsrc<0 || source[r->rsrc].so!=r->ro || \ |
434 |
|
|
source[r->rsrc].sflags&SVIRTUAL)) |
435 |
|
|
|
436 |
|
|
/* srcignore * |
437 |
|
|
* |
438 |
greg |
2.10 |
* The -dv flag is normally on for sources to be visible. |
439 |
greg |
2.4 |
*/ |
440 |
|
|
|
441 |
greg |
2.17 |
#define srcignore(m, r) !(directvis || r->crtype&SHADOW || \ |
442 |
|
|
distglow(m, r, raydist(r,PRIMARY))) |
443 |
greg |
2.4 |
|
444 |
|
|
|
445 |
|
|
m_light(m, r) /* ray hit a light source */ |
446 |
|
|
register OBJREC *m; |
447 |
|
|
register RAY *r; |
448 |
|
|
{ |
449 |
|
|
/* check for over-counting */ |
450 |
greg |
2.12 |
if (badcomponent(m, r)) |
451 |
greg |
2.14 |
return(1); |
452 |
greg |
2.17 |
if (wrongsource(m, r)) |
453 |
greg |
2.14 |
return(1); |
454 |
greg |
2.4 |
/* check for passed illum */ |
455 |
|
|
if (passillum(m, r)) { |
456 |
greg |
2.14 |
if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
457 |
|
|
return(rayshade(r, modifier(m->oargs.sarg[0]))); |
458 |
|
|
raytrans(r); |
459 |
|
|
return(1); |
460 |
greg |
2.4 |
} |
461 |
|
|
/* otherwise treat as source */ |
462 |
|
|
/* check for behind */ |
463 |
|
|
if (r->rod < 0.0) |
464 |
greg |
2.14 |
return(1); |
465 |
greg |
2.4 |
/* check for invisibility */ |
466 |
|
|
if (srcignore(m, r)) |
467 |
greg |
2.14 |
return(1); |
468 |
greg |
2.4 |
/* check for outside spot */ |
469 |
greg |
2.8 |
if (m->otype==MAT_SPOT && spotout(r, makespot(m), r->rot>=FHUGE)) |
470 |
greg |
2.14 |
return(1); |
471 |
greg |
2.4 |
/* get distribution pattern */ |
472 |
|
|
raytexture(r, m->omod); |
473 |
|
|
/* get source color */ |
474 |
|
|
setcolor(r->rcol, m->oargs.farg[0], |
475 |
|
|
m->oargs.farg[1], |
476 |
|
|
m->oargs.farg[2]); |
477 |
|
|
/* modify value */ |
478 |
|
|
multcolor(r->rcol, r->pcol); |
479 |
greg |
2.14 |
return(1); |
480 |
greg |
1.1 |
} |