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/* Copyright (c) 1991 Regents of the University of California */ |
| 2 |
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|
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#ifndef lint |
| 2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
| 2 |
> |
static const char RCSid[] = "$Id$"; |
| 3 |
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#endif |
| 6 |
– |
|
| 4 |
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/* |
| 5 |
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* source.c - routines dealing with illumination sources. |
| 6 |
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* |
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< |
* 8/20/85 |
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> |
* External symbols declared in source.h |
| 8 |
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*/ |
| 9 |
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|
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+ |
#include "copyright.h" |
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+ |
|
| 12 |
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#include "ray.h" |
| 13 |
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|
| 15 |
– |
#include "octree.h" |
| 16 |
– |
|
| 14 |
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#include "otypes.h" |
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|
| 16 |
+ |
#include "otspecial.h" |
| 17 |
+ |
|
| 18 |
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#include "source.h" |
| 19 |
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|
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#include "random.h" |
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|
| 22 |
+ |
extern double ssampdist; /* scatter sampling distance */ |
| 23 |
+ |
|
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+ |
#ifndef MAXSSAMP |
| 25 |
+ |
#define MAXSSAMP 16 /* maximum samples per ray */ |
| 26 |
+ |
#endif |
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+ |
|
| 28 |
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/* |
| 29 |
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* Structures used by direct() |
| 30 |
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*/ |
| 31 |
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|
| 32 |
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typedef struct { |
| 33 |
+ |
int sno; /* source number */ |
| 34 |
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FVECT dir; /* source direction */ |
| 35 |
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COLOR coef; /* material coefficient */ |
| 36 |
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COLOR val; /* contribution */ |
| 37 |
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} CONTRIB; /* direct contribution */ |
| 38 |
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|
| 39 |
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typedef struct { |
| 40 |
< |
int sno; /* source number */ |
| 40 |
> |
int sndx; /* source index (to CONTRIB array) */ |
| 41 |
|
float brt; /* brightness (for comparison) */ |
| 42 |
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} CNTPTR; /* contribution pointer */ |
| 43 |
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|
| 44 |
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static CONTRIB *srccnt; /* source contributions in direct() */ |
| 45 |
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static CNTPTR *cntord; /* source ordering in direct() */ |
| 46 |
+ |
static int maxcntr = 0; /* size of contribution arrays */ |
| 47 |
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|
| 48 |
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|
| 49 |
+ |
OBJREC * /* find an object's actual material */ |
| 50 |
+ |
findmaterial(register OBJREC *o) |
| 51 |
+ |
{ |
| 52 |
+ |
while (!ismaterial(o->otype)) { |
| 53 |
+ |
if (ismixture(o->otype)) |
| 54 |
+ |
return(NULL); /* reject mixed materials */ |
| 55 |
+ |
if (o->otype == MOD_ALIAS && o->oargs.nsargs) { |
| 56 |
+ |
OBJECT aobj; |
| 57 |
+ |
OBJREC *ao; |
| 58 |
+ |
aobj = lastmod(objndx(o), o->oargs.sarg[0]); |
| 59 |
+ |
if (aobj < 0) |
| 60 |
+ |
objerror(o, USER, "bad reference"); |
| 61 |
+ |
ao = objptr(aobj); |
| 62 |
+ |
if (ismaterial(ao->otype)) |
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+ |
return(ao); |
| 64 |
+ |
} |
| 65 |
+ |
if (o->omod == OVOID) |
| 66 |
+ |
return(NULL); |
| 67 |
+ |
o = objptr(o->omod); |
| 68 |
+ |
} |
| 69 |
+ |
return(o); |
| 70 |
+ |
} |
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+ |
|
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+ |
|
| 73 |
+ |
void |
| 74 |
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marksources() /* find and mark source objects */ |
| 75 |
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{ |
| 76 |
+ |
int foundsource = 0; |
| 77 |
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int i; |
| 78 |
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register OBJREC *o, *m; |
| 79 |
|
register int ns; |
| 80 |
|
/* initialize dispatch table */ |
| 81 |
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initstypes(); |
| 82 |
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/* find direct sources */ |
| 83 |
< |
for (i = 0; i < nobjects; i++) { |
| 83 |
> |
for (i = 0; i < nsceneobjs; i++) { |
| 84 |
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|
| 85 |
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o = objptr(i); |
| 86 |
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|
| 87 |
|
if (!issurface(o->otype) || o->omod == OVOID) |
| 88 |
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continue; |
| 89 |
< |
|
| 90 |
< |
m = objptr(o->omod); |
| 91 |
< |
|
| 92 |
< |
if (!islight(m->otype)) |
| 60 |
< |
continue; |
| 89 |
> |
/* find material */ |
| 90 |
> |
m = findmaterial(o); |
| 91 |
> |
if (m == NULL || !islight(m->otype)) |
| 92 |
> |
continue; /* not source modifier */ |
| 93 |
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|
| 94 |
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if (m->oargs.nfargs != (m->otype == MAT_GLOW ? 4 : |
| 95 |
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m->otype == MAT_SPOT ? 7 : 3)) |
| 99 |
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o->otype != OBJ_SOURCE && |
| 100 |
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m->oargs.farg[3] <= FTINY) |
| 101 |
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continue; /* don't bother */ |
| 102 |
+ |
if (m->oargs.farg[0] <= FTINY && m->oargs.farg[1] <= FTINY && |
| 103 |
+ |
m->oargs.farg[2] <= FTINY) |
| 104 |
+ |
continue; /* don't bother */ |
| 105 |
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|
| 106 |
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if (sfun[o->otype].of == NULL || |
| 107 |
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sfun[o->otype].of->setsrc == NULL) |
| 115 |
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if (m->otype == MAT_GLOW) { |
| 116 |
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source[ns].sflags |= SPROX; |
| 117 |
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source[ns].sl.prox = m->oargs.farg[3]; |
| 118 |
< |
if (o->otype == OBJ_SOURCE) |
| 118 |
> |
if (source[ns].sflags & SDISTANT) |
| 119 |
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source[ns].sflags |= SSKIP; |
| 120 |
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} else if (m->otype == MAT_SPOT) { |
| 121 |
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source[ns].sflags |= SSPOT; |
| 128 |
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source[ns].sflags |= SSKIP; |
| 129 |
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} |
| 130 |
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} |
| 131 |
+ |
#if SHADCACHE |
| 132 |
+ |
source[ns].obscache = NULL; |
| 133 |
+ |
#endif |
| 134 |
+ |
if (!(source[ns].sflags & SSKIP)) |
| 135 |
+ |
foundsource++; |
| 136 |
|
} |
| 137 |
< |
if (nsources <= 0) { |
| 137 |
> |
if (!foundsource) { |
| 138 |
|
error(WARNING, "no light sources found"); |
| 139 |
|
return; |
| 140 |
|
} |
| 141 |
|
markvirtuals(); /* find and add virtual sources */ |
| 142 |
< |
srccnt = (CONTRIB *)malloc(nsources*sizeof(CONTRIB)); |
| 143 |
< |
cntord = (CNTPTR *)malloc(nsources*sizeof(CNTPTR)); |
| 144 |
< |
if (srccnt == NULL || cntord == NULL) |
| 142 |
> |
/* allocate our contribution arrays */ |
| 143 |
> |
maxcntr = nsources + MAXSPART; /* start with this many */ |
| 144 |
> |
srccnt = (CONTRIB *)malloc(maxcntr*sizeof(CONTRIB)); |
| 145 |
> |
cntord = (CNTPTR *)malloc(maxcntr*sizeof(CNTPTR)); |
| 146 |
> |
if ((srccnt == NULL) | (cntord == NULL)) |
| 147 |
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goto memerr; |
| 148 |
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return; |
| 149 |
|
memerr: |
| 151 |
|
} |
| 152 |
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|
| 153 |
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|
| 154 |
< |
double |
| 155 |
< |
srcray(sr, r, sn) /* send a ray to a source, return domega */ |
| 114 |
< |
register RAY *sr; /* returned source ray */ |
| 115 |
< |
RAY *r; /* ray which hit object */ |
| 116 |
< |
register int sn; /* source number */ |
| 154 |
> |
void |
| 155 |
> |
freesources() /* free all source structures */ |
| 156 |
|
{ |
| 157 |
< |
double ddot; /* (distance times) cosine */ |
| 158 |
< |
FVECT vd; |
| 159 |
< |
double d; |
| 160 |
< |
register int i; |
| 157 |
> |
if (nsources > 0) { |
| 158 |
> |
#if SHADCACHE |
| 159 |
> |
while (nsources--) |
| 160 |
> |
freeobscache(&source[nsources]); |
| 161 |
> |
#endif |
| 162 |
> |
free((void *)source); |
| 163 |
> |
source = NULL; |
| 164 |
> |
nsources = 0; |
| 165 |
> |
} |
| 166 |
> |
if (maxcntr <= 0) |
| 167 |
> |
return; |
| 168 |
> |
free((void *)srccnt); |
| 169 |
> |
srccnt = NULL; |
| 170 |
> |
free((void *)cntord); |
| 171 |
> |
cntord = NULL; |
| 172 |
> |
maxcntr = 0; |
| 173 |
> |
} |
| 174 |
|
|
| 123 |
– |
if (source[sn].sflags & SSKIP) |
| 124 |
– |
return(0.0); /* skip this source */ |
| 175 |
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|
| 176 |
< |
rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
| 176 |
> |
int |
| 177 |
> |
srcray( /* send a ray to a source, return domega */ |
| 178 |
> |
register RAY *sr, /* returned source ray */ |
| 179 |
> |
RAY *r, /* ray which hit object */ |
| 180 |
> |
SRCINDEX *si /* source sample index */ |
| 181 |
> |
) |
| 182 |
> |
{ |
| 183 |
> |
double d; /* distance to source */ |
| 184 |
> |
register SRCREC *srcp; |
| 185 |
|
|
| 186 |
< |
sr->rsrc = sn; /* remember source */ |
| 129 |
< |
/* get source direction */ |
| 130 |
< |
if (source[sn].sflags & SDISTANT) { |
| 131 |
< |
/* constant direction */ |
| 132 |
< |
VCOPY(sr->rdir, source[sn].sloc); |
| 133 |
< |
} else { /* compute direction */ |
| 134 |
< |
for (i = 0; i < 3; i++) |
| 135 |
< |
sr->rdir[i] = source[sn].sloc[i] - sr->rorg[i]; |
| 186 |
> |
rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
| 187 |
|
|
| 188 |
< |
if (source[sn].sflags & SFLAT && |
| 189 |
< |
(ddot = -DOT(sr->rdir, source[sn].snorm)) <= FTINY) |
| 190 |
< |
return(0.0); /* behind surface! */ |
| 188 |
> |
while ((d = nextssamp(sr, si)) != 0.0) { |
| 189 |
> |
sr->rsrc = si->sn; /* remember source */ |
| 190 |
> |
srcp = source + si->sn; |
| 191 |
> |
if (srcp->sflags & SDISTANT) { |
| 192 |
> |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s)) |
| 193 |
> |
continue; |
| 194 |
> |
return(1); /* sample OK */ |
| 195 |
|
} |
| 196 |
< |
if (dstrsrc > FTINY) { |
| 142 |
< |
/* distribute source direction */ |
| 143 |
< |
dimlist[ndims] = sn + 8831; |
| 144 |
< |
peano(vd, 3, urand(ilhash(dimlist,ndims+1)+samplendx), .01); |
| 145 |
< |
for (i = 0; i < 3; i++) |
| 146 |
< |
vd[i] = dstrsrc * source[sn].ss * (1. - 2.*vd[i]); |
| 147 |
< |
if (source[sn].sflags & SFLAT) { /* project offset */ |
| 148 |
< |
d = DOT(vd, source[sn].snorm); |
| 149 |
< |
for (i = 0; i < 3; i++) |
| 150 |
< |
vd[i] -= d * source[sn].snorm[i]; |
| 151 |
< |
} |
| 152 |
< |
for (i = 0; i < 3; i++) /* offset source direction */ |
| 153 |
< |
sr->rdir[i] += vd[i]; |
| 154 |
< |
/* normalize */ |
| 155 |
< |
d = normalize(sr->rdir); |
| 156 |
< |
|
| 157 |
< |
} else if (!(source[sn].sflags & SDISTANT)) |
| 158 |
< |
/* normalize direction */ |
| 159 |
< |
d = normalize(sr->rdir); |
| 160 |
< |
|
| 161 |
< |
if (source[sn].sflags & SDISTANT) { |
| 162 |
< |
if (source[sn].sflags & SSPOT) { /* check location */ |
| 163 |
< |
for (i = 0; i < 3; i++) |
| 164 |
< |
vd[i] = source[sn].sl.s->aim[i] - sr->rorg[i]; |
| 165 |
< |
d = DOT(sr->rdir,vd); |
| 166 |
< |
if (d <= FTINY) |
| 167 |
< |
return(0.0); |
| 168 |
< |
d = DOT(vd,vd) - d*d; |
| 169 |
< |
if (PI*d > source[sn].sl.s->siz) |
| 170 |
< |
return(0.0); |
| 171 |
< |
} |
| 172 |
< |
return(source[sn].ss2); /* domega constant */ |
| 173 |
< |
} |
| 174 |
< |
/* check direction */ |
| 175 |
< |
if (d == 0.0) |
| 176 |
< |
return(0.0); |
| 196 |
> |
/* local source */ |
| 197 |
|
/* check proximity */ |
| 198 |
< |
if (source[sn].sflags & SPROX && |
| 199 |
< |
d > source[sn].sl.prox) |
| 180 |
< |
return(0.0); |
| 181 |
< |
/* compute dot product */ |
| 182 |
< |
if (source[sn].sflags & SFLAT) |
| 183 |
< |
ddot /= d; |
| 184 |
< |
else |
| 185 |
< |
ddot = 1.0; |
| 198 |
> |
if (srcp->sflags & SPROX && d > srcp->sl.prox) |
| 199 |
> |
continue; |
| 200 |
|
/* check angle */ |
| 201 |
< |
if (source[sn].sflags & SSPOT) { |
| 202 |
< |
if (source[sn].sl.s->siz < 2.0*PI * |
| 203 |
< |
(1.0 + DOT(source[sn].sl.s->aim,sr->rdir))) |
| 204 |
< |
return(0.0); |
| 205 |
< |
d += source[sn].sl.s->flen; /* adjust length */ |
| 201 |
> |
if (srcp->sflags & SSPOT) { |
| 202 |
> |
if (spotout(sr, srcp->sl.s)) |
| 203 |
> |
continue; |
| 204 |
> |
/* adjust solid angle */ |
| 205 |
> |
si->dom *= d*d; |
| 206 |
> |
d += srcp->sl.s->flen; |
| 207 |
> |
si->dom /= d*d; |
| 208 |
|
} |
| 209 |
< |
/* compute domega */ |
| 210 |
< |
return(ddot*source[sn].ss2/(d*d)); |
| 209 |
> |
return(1); /* sample OK */ |
| 210 |
> |
} |
| 211 |
> |
return(0); /* no more samples */ |
| 212 |
|
} |
| 213 |
|
|
| 214 |
|
|
| 215 |
< |
srcvalue(r) /* punch ray to source and compute value */ |
| 216 |
< |
RAY *r; |
| 215 |
> |
void |
| 216 |
> |
srcvalue( /* punch ray to source and compute value */ |
| 217 |
> |
register RAY *r |
| 218 |
> |
) |
| 219 |
|
{ |
| 220 |
|
register SRCREC *sp; |
| 221 |
|
|
| 224 |
|
/* check intersection */ |
| 225 |
|
if (!(*ofun[sp->so->otype].funp)(sp->so, r)) |
| 226 |
|
return; |
| 227 |
< |
raycont(r); /* compute contribution */ |
| 227 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
| 228 |
> |
goto nomat; |
| 229 |
> |
rayparticipate(r); |
| 230 |
|
return; |
| 231 |
|
} |
| 232 |
|
/* compute intersection */ |
| 234 |
|
(*ofun[sp->so->otype].funp)(sp->so, r)) { |
| 235 |
|
if (sp->sa.success >= 0) |
| 236 |
|
sp->sa.success++; |
| 237 |
< |
raycont(r); /* compute contribution */ |
| 237 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
| 238 |
> |
goto nomat; |
| 239 |
> |
rayparticipate(r); |
| 240 |
|
return; |
| 241 |
|
} |
| 242 |
+ |
/* we missed our mark! */ |
| 243 |
|
if (sp->sa.success < 0) |
| 244 |
|
return; /* bitched already */ |
| 245 |
|
sp->sa.success -= AIMREQT; |
| 248 |
|
sprintf(errmsg, "aiming failure for light source \"%s\"", |
| 249 |
|
sp->so->oname); |
| 250 |
|
error(WARNING, errmsg); /* issue warning */ |
| 251 |
+ |
return; |
| 252 |
+ |
nomat: |
| 253 |
+ |
objerror(r->ro, USER, "material not found"); |
| 254 |
|
} |
| 255 |
|
|
| 256 |
|
|
| 257 |
+ |
int |
| 258 |
+ |
sourcehit( /* check to see if ray hit distant source */ |
| 259 |
+ |
register RAY *r |
| 260 |
+ |
) |
| 261 |
+ |
{ |
| 262 |
+ |
int first, last; |
| 263 |
+ |
register int i; |
| 264 |
+ |
|
| 265 |
+ |
if (r->rsrc >= 0) { /* check only one if aimed */ |
| 266 |
+ |
first = last = r->rsrc; |
| 267 |
+ |
} else { /* otherwise check all */ |
| 268 |
+ |
first = 0; last = nsources-1; |
| 269 |
+ |
} |
| 270 |
+ |
for (i = first; i <= last; i++) |
| 271 |
+ |
if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT) |
| 272 |
+ |
/* |
| 273 |
+ |
* Check to see if ray is within |
| 274 |
+ |
* solid angle of source. |
| 275 |
+ |
*/ |
| 276 |
+ |
if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
| 277 |
+ |
<= source[i].ss2) { |
| 278 |
+ |
r->ro = source[i].so; |
| 279 |
+ |
if (!(source[i].sflags & SSKIP)) |
| 280 |
+ |
break; |
| 281 |
+ |
} |
| 282 |
+ |
|
| 283 |
+ |
if (r->ro != NULL) { |
| 284 |
+ |
r->robj = objndx(r->ro); |
| 285 |
+ |
for (i = 0; i < 3; i++) |
| 286 |
+ |
r->ron[i] = -r->rdir[i]; |
| 287 |
+ |
r->rod = 1.0; |
| 288 |
+ |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
| 289 |
+ |
r->uv[0] = r->uv[1] = 0.0; |
| 290 |
+ |
r->rox = NULL; |
| 291 |
+ |
return(1); |
| 292 |
+ |
} |
| 293 |
+ |
return(0); |
| 294 |
+ |
} |
| 295 |
+ |
|
| 296 |
+ |
|
| 297 |
+ |
#if SHADCACHE /* preemptive shadow checking */ |
| 298 |
+ |
#define ABS(x) ((x)>0 ? (x) : -(x)) |
| 299 |
+ |
|
| 300 |
+ |
static void /* find closest blockers to source */ |
| 301 |
+ |
initobscache(SRCREC *srcp) |
| 302 |
+ |
{ |
| 303 |
+ |
int i; |
| 304 |
+ |
int cachelen; |
| 305 |
+ |
|
| 306 |
+ |
if (srcp->sflags & SDISTANT) |
| 307 |
+ |
cachelen = 4*SHADCACHE*SHADCACHE; |
| 308 |
+ |
else if (srcp->sflags & SFLAT) |
| 309 |
+ |
cachelen = SHADCACHE*SHADCACHE*3 + (SHADCACHE&1)*SHADCACHE*4; |
| 310 |
+ |
else /* spherical distribution */ |
| 311 |
+ |
cachelen = SHADCACHE*SHADCACHE*6; |
| 312 |
+ |
/* allocate cache */ |
| 313 |
+ |
DCHECK(srcp->obscache != NULL, |
| 314 |
+ |
CONSISTENCY, "initobscache() called twice"); |
| 315 |
+ |
srcp->obscache = (OBSCACHE *)malloc(sizeof(OBSCACHE) + |
| 316 |
+ |
sizeof(OBJECT)*(cachelen-1)); |
| 317 |
+ |
if (srcp->obscache == NULL) |
| 318 |
+ |
error(SYSTEM, "out of memory in initobscache()"); |
| 319 |
+ |
/* set parameters */ |
| 320 |
+ |
if (srcp->sflags & SDISTANT) { |
| 321 |
+ |
int ax, ax1, ax2; |
| 322 |
+ |
RREAL amax = 0; |
| 323 |
+ |
for (ax1 = 3; ax1--; ) |
| 324 |
+ |
if (ABS(srcp->sloc[ax1]) > amax) { |
| 325 |
+ |
amax = ABS(srcp->sloc[ax1]); |
| 326 |
+ |
ax = ax1; |
| 327 |
+ |
} |
| 328 |
+ |
srcp->obscache->p.d.ax = ax; |
| 329 |
+ |
ax1 = (ax+1)%3; |
| 330 |
+ |
ax2 = (ax+2)%3; |
| 331 |
+ |
VCOPY(srcp->obscache->p.d.o, thescene.cuorg); |
| 332 |
+ |
if (srcp->sloc[ax] > 0) |
| 333 |
+ |
srcp->obscache->p.d.o[ax] += thescene.cusize; |
| 334 |
+ |
if (srcp->sloc[ax1] < 0) |
| 335 |
+ |
srcp->obscache->p.d.o[ax1] += thescene.cusize * |
| 336 |
+ |
srcp->sloc[ax1] / ABS(srcp->sloc[ax]); |
| 337 |
+ |
if (srcp->sloc[ax2] < 0) |
| 338 |
+ |
srcp->obscache->p.d.o[ax2] += thescene.cusize * |
| 339 |
+ |
srcp->sloc[ax2] / ABS(srcp->sloc[ax]); |
| 340 |
+ |
srcp->obscache->p.d.e1 = (1.-FTINY) / (thescene.cusize*(1. + |
| 341 |
+ |
fabs(srcp->sloc[ax1]/srcp->sloc[ax]))); |
| 342 |
+ |
srcp->obscache->p.d.e2 = (1.-FTINY) / (thescene.cusize*(1. + |
| 343 |
+ |
fabs(srcp->sloc[ax2]/srcp->sloc[ax]))); |
| 344 |
+ |
} else if (srcp->sflags & SFLAT) { |
| 345 |
+ |
VCOPY(srcp->obscache->p.f.u, srcp->ss[SU]); |
| 346 |
+ |
normalize(srcp->obscache->p.f.u); |
| 347 |
+ |
fcross(srcp->obscache->p.f.v, |
| 348 |
+ |
srcp->snorm, srcp->obscache->p.f.u); |
| 349 |
+ |
} |
| 350 |
+ |
/* XXX Should cast rays from source */ |
| 351 |
+ |
for (i = cachelen; i--; ) |
| 352 |
+ |
srcp->obscache->obs[i] = OVOID; |
| 353 |
+ |
} |
| 354 |
+ |
|
| 355 |
+ |
|
| 356 |
+ |
static OBJECT * /* return occluder cache entry */ |
| 357 |
+ |
srcobstructp(register RAY *r) |
| 358 |
+ |
{ |
| 359 |
+ |
static OBJECT noobs; |
| 360 |
+ |
SRCREC *srcp; |
| 361 |
+ |
int ondx; |
| 362 |
+ |
|
| 363 |
+ |
DCHECK(r->rsrc < 0, CONSISTENCY, |
| 364 |
+ |
"srcobstructp() called with unaimed ray"); |
| 365 |
+ |
noobs = OVOID; |
| 366 |
+ |
srcp = &source[r->rsrc]; |
| 367 |
+ |
if (srcp->obscache == NULL) /* initialize cache */ |
| 368 |
+ |
initobscache(srcp); |
| 369 |
+ |
/* compute cache index */ |
| 370 |
+ |
if (srcp->sflags & SDISTANT) { |
| 371 |
+ |
int ax, ax1, ax2; |
| 372 |
+ |
double t; |
| 373 |
+ |
ax = srcp->obscache->p.d.ax; |
| 374 |
+ |
if ((ax1 = ax+1) >= 3) ax1 -= 3; |
| 375 |
+ |
if ((ax2 = ax+2) >= 3) ax2 -= 3; |
| 376 |
+ |
t = (srcp->obscache->p.d.o[ax] - r->rorg[ax]) / srcp->sloc[ax]; |
| 377 |
+ |
if (t <= FTINY) |
| 378 |
+ |
return &noobs; /* could happen if ray is outside */ |
| 379 |
+ |
ondx = 2*SHADCACHE*(int)(2*SHADCACHE*srcp->obscache->p.d.e1 * |
| 380 |
+ |
(r->rorg[ax1] + t*srcp->sloc[ax1] - |
| 381 |
+ |
srcp->obscache->p.d.o[ax1])); |
| 382 |
+ |
ondx += (int)(2*SHADCACHE*srcp->obscache->p.d.e2 * |
| 383 |
+ |
(r->rorg[ax2] + t*srcp->sloc[ax2] - |
| 384 |
+ |
srcp->obscache->p.d.o[ax2])); |
| 385 |
+ |
if (ondx < 0 | ondx >= 4*SHADCACHE*SHADCACHE) |
| 386 |
+ |
return &nobs; /* could happen if ray is outside */ |
| 387 |
+ |
} else if (srcp->sflags & SFLAT) { |
| 388 |
+ |
FVECT sd; |
| 389 |
+ |
RREAL sd0m, sd1m; |
| 390 |
+ |
sd[0] = -DOT(r->rdir, srcp->obscache->p.f.u); |
| 391 |
+ |
sd[1] = -DOT(r->rdir, srcp->obscache->p.f.v); |
| 392 |
+ |
sd[2] = -DOT(r->rdir, srcp->snorm); |
| 393 |
+ |
if (sd[2] < 0) |
| 394 |
+ |
return &noobs; /* shouldn't happen */ |
| 395 |
+ |
sd0m = ABS(sd[0]); |
| 396 |
+ |
sd1m = ABS(sd[1]); |
| 397 |
+ |
if (sd[2] >= sd0m && sd[2] >= sd1m) { |
| 398 |
+ |
ondx = SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
| 399 |
+ |
(1. + sd[0]/sd[2])); |
| 400 |
+ |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 401 |
+ |
(1. + sd[1]/sd[2])); |
| 402 |
+ |
} else if (sd0m >= sd1m) { |
| 403 |
+ |
ondx = SHADCACHE*SHADCACHE; |
| 404 |
+ |
if (sd[0] < 0) |
| 405 |
+ |
ondx += ((SHADCACHE+1)>>1)*SHADCACHE; |
| 406 |
+ |
ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
| 407 |
+ |
sd[2]/sd0m); |
| 408 |
+ |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 409 |
+ |
(1. + sd[1]/sd0m)); |
| 410 |
+ |
} else /* sd1m > sd0m */ { |
| 411 |
+ |
ondx = SHADCACHE*SHADCACHE + |
| 412 |
+ |
((SHADCACHE+1)>>1)*SHADCACHE*2; |
| 413 |
+ |
if (sd[1] < 0) |
| 414 |
+ |
ondx += ((SHADCACHE+1)>>1)*SHADCACHE; |
| 415 |
+ |
ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
| 416 |
+ |
sd[2]/sd1m); |
| 417 |
+ |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 418 |
+ |
(1. + sd[0]/sd1m)); |
| 419 |
+ |
} |
| 420 |
+ |
} else /* spherical distribution */ { |
| 421 |
+ |
int ax, ax1, ax2; |
| 422 |
+ |
RREAL amax = 0; |
| 423 |
+ |
for (ax1 = 3; ax1--; ) |
| 424 |
+ |
if (ABS(r->rdir[ax1]) > amax) { |
| 425 |
+ |
amax = ABS(r->rdir[ax1]); |
| 426 |
+ |
ax = ax1; |
| 427 |
+ |
} |
| 428 |
+ |
if ((ax1 = ax+1) >= 3) ax1 -= 3; |
| 429 |
+ |
if ((ax2 = ax+2) >= 3) ax2 -= 3; |
| 430 |
+ |
ondx = 2*SHADCACHE*SHADCACHE * ax; |
| 431 |
+ |
if (r->rdir[ax] < 0) |
| 432 |
+ |
ondx += SHADCACHE*SHADCACHE; |
| 433 |
+ |
ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
| 434 |
+ |
(1. + r->rdir[ax1]/amax)); |
| 435 |
+ |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 436 |
+ |
(1. + r->rdir[ax2]/amax)); |
| 437 |
+ |
} |
| 438 |
+ |
/* return cache pointer */ |
| 439 |
+ |
return(&srcp->obscache->obs[ondx]); |
| 440 |
+ |
} |
| 441 |
+ |
|
| 442 |
+ |
|
| 443 |
+ |
void /* free obstruction cache */ |
| 444 |
+ |
freeobscache(SRCREC *srcp) |
| 445 |
+ |
{ |
| 446 |
+ |
if (srcp->obscache == NULL) |
| 447 |
+ |
return; |
| 448 |
+ |
free((void *)srcp->obscache); |
| 449 |
+ |
srcp->obscache = NULL; |
| 450 |
+ |
} |
| 451 |
+ |
|
| 452 |
+ |
|
| 453 |
+ |
void /* record a source blocker */ |
| 454 |
+ |
srcblocker(register RAY *r) |
| 455 |
+ |
{ |
| 456 |
+ |
OBJREC *m; |
| 457 |
+ |
|
| 458 |
+ |
if (r->robj == OVOID || objptr(r->robj) != r->ro || |
| 459 |
+ |
isvolume(r->ro->otype)) |
| 460 |
+ |
return; /* don't record complex blockers */ |
| 461 |
+ |
m = findmaterial(r->ro); |
| 462 |
+ |
if (m == NULL) |
| 463 |
+ |
return; /* no material?! */ |
| 464 |
+ |
if (!(ofun[m->otype].flags & T_OPAQUE)) |
| 465 |
+ |
return; /* material not a reliable blocker */ |
| 466 |
+ |
|
| 467 |
+ |
*srcobstructp(r) = r->robj; /* else record obstructor */ |
| 468 |
+ |
} |
| 469 |
+ |
|
| 470 |
+ |
|
| 471 |
+ |
int /* check ray against cached blocker */ |
| 472 |
+ |
srcblocked(RAY *r) |
| 473 |
+ |
{ |
| 474 |
+ |
OBJECT obs = *srcobstructp(r); |
| 475 |
+ |
OBJREC *op; |
| 476 |
+ |
|
| 477 |
+ |
if (obs == OVOID) |
| 478 |
+ |
return(0); |
| 479 |
+ |
op = objptr(obs); /* check for intersection */ |
| 480 |
+ |
return ((*ofun[op->otype].funp)(op, r)); |
| 481 |
+ |
} |
| 482 |
+ |
|
| 483 |
+ |
#endif |
| 484 |
+ |
|
| 485 |
+ |
|
| 486 |
|
static int |
| 487 |
< |
cntcmp(sc1, sc2) /* contribution compare (descending) */ |
| 488 |
< |
register CNTPTR *sc1, *sc2; |
| 487 |
> |
cntcmp( /* contribution compare (descending) */ |
| 488 |
> |
const void *p1, |
| 489 |
> |
const void *p2 |
| 490 |
> |
) |
| 491 |
|
{ |
| 492 |
+ |
register const CNTPTR *sc1 = (const CNTPTR *)p1; |
| 493 |
+ |
register const CNTPTR *sc2 = (const CNTPTR *)p2; |
| 494 |
+ |
|
| 495 |
|
if (sc1->brt > sc2->brt) |
| 496 |
|
return(-1); |
| 497 |
|
if (sc1->brt < sc2->brt) |
| 500 |
|
} |
| 501 |
|
|
| 502 |
|
|
| 503 |
< |
direct(r, f, p) /* add direct component */ |
| 504 |
< |
RAY *r; /* ray that hit surface */ |
| 505 |
< |
int (*f)(); /* direct component coefficient function */ |
| 506 |
< |
char *p; /* data for f */ |
| 503 |
> |
void |
| 504 |
> |
direct( /* add direct component */ |
| 505 |
> |
RAY *r, /* ray that hit surface */ |
| 506 |
> |
void (*f)(), /* direct component coefficient function */ |
| 507 |
> |
char *p /* data for f */ |
| 508 |
> |
) |
| 509 |
|
{ |
| 510 |
< |
extern int (*trace)(); |
| 248 |
< |
extern double pow(); |
| 510 |
> |
extern void (*trace)(); |
| 511 |
|
register int sn; |
| 512 |
+ |
register CONTRIB *scp; |
| 513 |
+ |
SRCINDEX si; |
| 514 |
|
int nshadcheck, ncnts; |
| 515 |
|
int nhits; |
| 516 |
< |
double dom, prob, ourthresh, hwt; |
| 516 |
> |
double prob, ourthresh, hwt; |
| 517 |
|
RAY sr; |
| 518 |
|
/* NOTE: srccnt and cntord global so no recursion */ |
| 519 |
|
if (nsources <= 0) |
| 520 |
|
return; /* no sources?! */ |
| 257 |
– |
/* compute number to check */ |
| 258 |
– |
nshadcheck = pow((double)nsources, shadcert) + .5; |
| 259 |
– |
/* modify threshold */ |
| 260 |
– |
ourthresh = shadthresh / r->rweight; |
| 521 |
|
/* potential contributions */ |
| 522 |
< |
for (sn = 0; sn < nsources; sn++) { |
| 523 |
< |
cntord[sn].sno = sn; |
| 524 |
< |
cntord[sn].brt = 0.0; |
| 525 |
< |
/* get source ray */ |
| 526 |
< |
if ((dom = srcray(&sr, r, sn)) == 0.0) |
| 527 |
< |
continue; |
| 528 |
< |
VCOPY(srccnt[sn].dir, sr.rdir); |
| 522 |
> |
initsrcindex(&si); |
| 523 |
> |
for (sn = 0; srcray(&sr, r, &si); sn++) { |
| 524 |
> |
if (sn >= maxcntr) { |
| 525 |
> |
maxcntr = sn + MAXSPART; |
| 526 |
> |
srccnt = (CONTRIB *)realloc((void *)srccnt, |
| 527 |
> |
maxcntr*sizeof(CONTRIB)); |
| 528 |
> |
cntord = (CNTPTR *)realloc((void *)cntord, |
| 529 |
> |
maxcntr*sizeof(CNTPTR)); |
| 530 |
> |
if ((srccnt == NULL) | (cntord == NULL)) |
| 531 |
> |
error(SYSTEM, "out of memory in direct"); |
| 532 |
> |
} |
| 533 |
> |
cntord[sn].sndx = sn; |
| 534 |
> |
scp = srccnt + sn; |
| 535 |
> |
scp->sno = sr.rsrc; |
| 536 |
|
/* compute coefficient */ |
| 537 |
< |
(*f)(srccnt[sn].coef, p, srccnt[sn].dir, dom); |
| 538 |
< |
cntord[sn].brt = bright(srccnt[sn].coef); |
| 537 |
> |
(*f)(scp->coef, p, sr.rdir, si.dom); |
| 538 |
> |
cntord[sn].brt = bright(scp->coef); |
| 539 |
|
if (cntord[sn].brt <= 0.0) |
| 540 |
|
continue; |
| 541 |
+ |
#if SHADCACHE |
| 542 |
+ |
/* check shadow cache */ |
| 543 |
+ |
if (si.np == 1 && srcblocked(&sr)) { |
| 544 |
+ |
cntord[sn].brt = 0.0; |
| 545 |
+ |
continue; |
| 546 |
+ |
} |
| 547 |
+ |
#endif |
| 548 |
+ |
VCOPY(scp->dir, sr.rdir); |
| 549 |
|
/* compute potential */ |
| 550 |
|
sr.revf = srcvalue; |
| 551 |
|
rayvalue(&sr); |
| 552 |
< |
copycolor(srccnt[sn].val, sr.rcol); |
| 553 |
< |
multcolor(srccnt[sn].val, srccnt[sn].coef); |
| 554 |
< |
cntord[sn].brt = bright(srccnt[sn].val); |
| 552 |
> |
copycolor(scp->val, sr.rcol); |
| 553 |
> |
multcolor(scp->val, scp->coef); |
| 554 |
> |
cntord[sn].brt = bright(scp->val); |
| 555 |
|
} |
| 556 |
|
/* sort contributions */ |
| 557 |
< |
qsort(cntord, nsources, sizeof(CNTPTR), cntcmp); |
| 557 |
> |
qsort(cntord, sn, sizeof(CNTPTR), cntcmp); |
| 558 |
|
{ /* find last */ |
| 559 |
|
register int l, m; |
| 560 |
|
|
| 561 |
< |
sn = 0; ncnts = l = nsources; |
| 561 |
> |
ncnts = l = sn; |
| 562 |
> |
sn = 0; |
| 563 |
|
while ((m = (sn + ncnts) >> 1) != l) { |
| 564 |
|
if (cntord[m].brt > 0.0) |
| 565 |
|
sn = m; |
| 568 |
|
l = m; |
| 569 |
|
} |
| 570 |
|
} |
| 571 |
+ |
if (ncnts == 0) |
| 572 |
+ |
return; /* no contributions! */ |
| 573 |
|
/* accumulate tail */ |
| 574 |
|
for (sn = ncnts-1; sn > 0; sn--) |
| 575 |
|
cntord[sn-1].brt += cntord[sn].brt; |
| 576 |
+ |
/* compute number to check */ |
| 577 |
+ |
nshadcheck = pow((double)ncnts, shadcert) + .5; |
| 578 |
+ |
/* modify threshold */ |
| 579 |
+ |
ourthresh = shadthresh / r->rweight; |
| 580 |
|
/* test for shadows */ |
| 581 |
< |
nhits = 0; |
| 582 |
< |
for (sn = 0; sn < ncnts; sn++) { |
| 581 |
> |
for (nhits = 0, hwt = 0.0, sn = 0; sn < ncnts; |
| 582 |
> |
hwt += (double)source[scp->sno].nhits / |
| 583 |
> |
(double)source[scp->sno].ntests, |
| 584 |
> |
sn++) { |
| 585 |
|
/* check threshold */ |
| 586 |
|
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
| 587 |
|
cntord[sn].brt-cntord[sn+nshadcheck].brt) |
| 588 |
|
< ourthresh*bright(r->rcol)) |
| 589 |
|
break; |
| 590 |
< |
/* get statistics */ |
| 307 |
< |
source[cntord[sn].sno].ntests++; |
| 590 |
> |
scp = srccnt + cntord[sn].sndx; |
| 591 |
|
/* test for hit */ |
| 592 |
|
rayorigin(&sr, r, SHADOW, 1.0); |
| 593 |
< |
VCOPY(sr.rdir, srccnt[cntord[sn].sno].dir); |
| 594 |
< |
sr.rsrc = cntord[sn].sno; |
| 593 |
> |
VCOPY(sr.rdir, scp->dir); |
| 594 |
> |
sr.rsrc = scp->sno; |
| 595 |
> |
/* keep statistics */ |
| 596 |
> |
if (source[scp->sno].ntests++ > 0xfffffff0) { |
| 597 |
> |
source[scp->sno].ntests >>= 1; |
| 598 |
> |
source[scp->sno].nhits >>= 1; |
| 599 |
> |
} |
| 600 |
|
if (localhit(&sr, &thescene) && |
| 601 |
< |
( sr.ro != source[cntord[sn].sno].so || |
| 602 |
< |
source[cntord[sn].sno].sflags & SFOLLOW )) { |
| 601 |
> |
( sr.ro != source[scp->sno].so || |
| 602 |
> |
source[scp->sno].sflags & SFOLLOW )) { |
| 603 |
|
/* follow entire path */ |
| 604 |
|
raycont(&sr); |
| 605 |
+ |
rayparticipate(&sr); |
| 606 |
|
if (trace != NULL) |
| 607 |
|
(*trace)(&sr); /* trace execution */ |
| 608 |
< |
if (bright(sr.rcol) <= FTINY) |
| 608 |
> |
if (bright(sr.rcol) <= FTINY) { |
| 609 |
> |
#if SHADCACHE |
| 610 |
> |
if ((scp <= srccnt || scp[-1].sno != scp->sno) |
| 611 |
> |
&& (scp >= srccnt+ncnts || |
| 612 |
> |
scp[1].sno != scp->sno)) |
| 613 |
> |
srcblocker(&sr); |
| 614 |
> |
#endif |
| 615 |
|
continue; /* missed! */ |
| 616 |
< |
copycolor(srccnt[cntord[sn].sno].val, sr.rcol); |
| 617 |
< |
multcolor(srccnt[cntord[sn].sno].val, |
| 618 |
< |
srccnt[cntord[sn].sno].coef); |
| 616 |
> |
} |
| 617 |
> |
copycolor(scp->val, sr.rcol); |
| 618 |
> |
multcolor(scp->val, scp->coef); |
| 619 |
|
} |
| 620 |
|
/* add contribution if hit */ |
| 621 |
< |
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
| 621 |
> |
addcolor(r->rcol, scp->val); |
| 622 |
|
nhits++; |
| 623 |
< |
source[cntord[sn].sno].nhits++; |
| 623 |
> |
source[scp->sno].nhits++; |
| 624 |
|
} |
| 625 |
< |
/* surface hit rate */ |
| 626 |
< |
if (sn > 0) |
| 627 |
< |
hwt = (double)nhits / (double)sn; |
| 625 |
> |
/* source hit rate */ |
| 626 |
> |
if (hwt > FTINY) |
| 627 |
> |
hwt = (double)nhits / hwt; |
| 628 |
|
else |
| 629 |
|
hwt = 0.5; |
| 630 |
|
#ifdef DEBUG |
| 631 |
< |
sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
| 631 |
> |
sprintf(errmsg, "%d tested, %d untested, %f conditional hit rate\n", |
| 632 |
|
sn, ncnts-sn, hwt); |
| 633 |
|
eputs(errmsg); |
| 634 |
|
#endif |
| 635 |
|
/* add in untested sources */ |
| 636 |
|
for ( ; sn < ncnts; sn++) { |
| 637 |
< |
prob = hwt * (double)source[cntord[sn].sno].nhits / |
| 638 |
< |
(double)source[cntord[sn].sno].ntests; |
| 639 |
< |
scalecolor(srccnt[cntord[sn].sno].val, prob); |
| 640 |
< |
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
| 637 |
> |
scp = srccnt + cntord[sn].sndx; |
| 638 |
> |
prob = hwt * (double)source[scp->sno].nhits / |
| 639 |
> |
(double)source[scp->sno].ntests; |
| 640 |
> |
if (prob > 1.0) |
| 641 |
> |
prob = 1.0; |
| 642 |
> |
scalecolor(scp->val, prob); |
| 643 |
> |
addcolor(r->rcol, scp->val); |
| 644 |
|
} |
| 645 |
+ |
} |
| 646 |
+ |
|
| 647 |
+ |
|
| 648 |
+ |
void |
| 649 |
+ |
srcscatter( /* compute source scattering into ray */ |
| 650 |
+ |
register RAY *r |
| 651 |
+ |
) |
| 652 |
+ |
{ |
| 653 |
+ |
int oldsampndx; |
| 654 |
+ |
int nsamps; |
| 655 |
+ |
RAY sr; |
| 656 |
+ |
SRCINDEX si; |
| 657 |
+ |
double t, d; |
| 658 |
+ |
double re, ge, be; |
| 659 |
+ |
COLOR cvext; |
| 660 |
+ |
int i, j; |
| 661 |
+ |
|
| 662 |
+ |
if (r->slights == NULL || r->slights[0] == 0 |
| 663 |
+ |
|| r->gecc >= 1.-FTINY || r->rot >= FHUGE) |
| 664 |
+ |
return; |
| 665 |
+ |
if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1) |
| 666 |
+ |
nsamps = 1; |
| 667 |
+ |
#if MAXSSAMP |
| 668 |
+ |
else if (nsamps > MAXSSAMP) |
| 669 |
+ |
nsamps = MAXSSAMP; |
| 670 |
+ |
#endif |
| 671 |
+ |
oldsampndx = samplendx; |
| 672 |
+ |
samplendx = random()&0x7fff; /* randomize */ |
| 673 |
+ |
for (i = r->slights[0]; i > 0; i--) { /* for each source */ |
| 674 |
+ |
for (j = 0; j < nsamps; j++) { /* for each sample position */ |
| 675 |
+ |
samplendx++; |
| 676 |
+ |
t = r->rot * (j+frandom())/nsamps; |
| 677 |
+ |
/* extinction */ |
| 678 |
+ |
re = t*colval(r->cext,RED); |
| 679 |
+ |
ge = t*colval(r->cext,GRN); |
| 680 |
+ |
be = t*colval(r->cext,BLU); |
| 681 |
+ |
setcolor(cvext, re > 92. ? 0. : exp(-re), |
| 682 |
+ |
ge > 92. ? 0. : exp(-ge), |
| 683 |
+ |
be > 92. ? 0. : exp(-be)); |
| 684 |
+ |
if (intens(cvext) <= FTINY) |
| 685 |
+ |
break; /* too far away */ |
| 686 |
+ |
sr.rorg[0] = r->rorg[0] + r->rdir[0]*t; |
| 687 |
+ |
sr.rorg[1] = r->rorg[1] + r->rdir[1]*t; |
| 688 |
+ |
sr.rorg[2] = r->rorg[2] + r->rdir[2]*t; |
| 689 |
+ |
sr.rmax = 0.; |
| 690 |
+ |
initsrcindex(&si); /* sample ray to this source */ |
| 691 |
+ |
si.sn = r->slights[i]; |
| 692 |
+ |
nopart(&si, &sr); |
| 693 |
+ |
if (!srcray(&sr, NULL, &si) || |
| 694 |
+ |
sr.rsrc != r->slights[i]) |
| 695 |
+ |
continue; /* no path */ |
| 696 |
+ |
copycolor(sr.cext, r->cext); |
| 697 |
+ |
copycolor(sr.albedo, r->albedo); |
| 698 |
+ |
sr.gecc = r->gecc; |
| 699 |
+ |
sr.slights = r->slights; |
| 700 |
+ |
rayvalue(&sr); /* eval. source ray */ |
| 701 |
+ |
if (bright(sr.rcol) <= FTINY) |
| 702 |
+ |
continue; |
| 703 |
+ |
if (r->gecc <= FTINY) /* compute P(theta) */ |
| 704 |
+ |
d = 1.; |
| 705 |
+ |
else { |
| 706 |
+ |
d = DOT(r->rdir, sr.rdir); |
| 707 |
+ |
d = 1. + r->gecc*r->gecc - 2.*r->gecc*d; |
| 708 |
+ |
d = (1. - r->gecc*r->gecc) / (d*sqrt(d)); |
| 709 |
+ |
} |
| 710 |
+ |
/* other factors */ |
| 711 |
+ |
d *= si.dom * r->rot / (4.*PI*nsamps); |
| 712 |
+ |
multcolor(sr.rcol, r->cext); |
| 713 |
+ |
multcolor(sr.rcol, r->albedo); |
| 714 |
+ |
scalecolor(sr.rcol, d); |
| 715 |
+ |
multcolor(sr.rcol, cvext); |
| 716 |
+ |
addcolor(r->rcol, sr.rcol); /* add it in */ |
| 717 |
+ |
} |
| 718 |
+ |
} |
| 719 |
+ |
samplendx = oldsampndx; |
| 720 |
+ |
} |
| 721 |
+ |
|
| 722 |
+ |
|
| 723 |
+ |
/**************************************************************** |
| 724 |
+ |
* The following macros were separated from the m_light() routine |
| 725 |
+ |
* because they are very nasty and difficult to understand. |
| 726 |
+ |
*/ |
| 727 |
+ |
|
| 728 |
+ |
/* illumblock * |
| 729 |
+ |
* |
| 730 |
+ |
* We cannot allow an illum to pass to another illum, because that |
| 731 |
+ |
* would almost certainly constitute overcounting. |
| 732 |
+ |
* However, we do allow an illum to pass to another illum |
| 733 |
+ |
* that is actually going to relay to a virtual light source. |
| 734 |
+ |
* We also prevent an illum from passing to a glow; this provides a |
| 735 |
+ |
* convenient mechanism for defining detailed light source |
| 736 |
+ |
* geometry behind (or inside) an effective radiator. |
| 737 |
+ |
*/ |
| 738 |
+ |
|
| 739 |
+ |
static int |
| 740 |
+ |
weaksrcmat(int obj) /* identify material */ |
| 741 |
+ |
{ |
| 742 |
+ |
register OBJREC *o = objptr(obj); |
| 743 |
+ |
|
| 744 |
+ |
while (!ismaterial(o->otype)) /* find material */ |
| 745 |
+ |
o = objptr(o->omod); |
| 746 |
+ |
return((o->otype==MAT_ILLUM)|(o->otype==MAT_GLOW)); |
| 747 |
+ |
} |
| 748 |
+ |
|
| 749 |
+ |
#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
| 750 |
+ |
r->rod > 0.0 && \ |
| 751 |
+ |
weaksrcmat(source[r->rsrc].so->omod)) |
| 752 |
+ |
|
| 753 |
+ |
/* wrongsource * |
| 754 |
+ |
* |
| 755 |
+ |
* This source is the wrong source (ie. overcounted) if we are |
| 756 |
+ |
* aimed to a different source than the one we hit and the one |
| 757 |
+ |
* we hit is not an illum that should be passed. |
| 758 |
+ |
*/ |
| 759 |
+ |
|
| 760 |
+ |
#define wrongsource(m, r) (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \ |
| 761 |
+ |
(m->otype!=MAT_ILLUM || illumblock(m,r))) |
| 762 |
+ |
|
| 763 |
+ |
/* distglow * |
| 764 |
+ |
* |
| 765 |
+ |
* A distant glow is an object that sometimes acts as a light source, |
| 766 |
+ |
* but is too far away from the test point to be one in this case. |
| 767 |
+ |
* (Glows with negative radii should NEVER participate in illumination.) |
| 768 |
+ |
*/ |
| 769 |
+ |
|
| 770 |
+ |
#define distglow(m, r, d) (m->otype==MAT_GLOW && \ |
| 771 |
+ |
m->oargs.farg[3] >= -FTINY && \ |
| 772 |
+ |
d > m->oargs.farg[3]) |
| 773 |
+ |
|
| 774 |
+ |
/* badcomponent * |
| 775 |
+ |
* |
| 776 |
+ |
* We must avoid counting light sources in the ambient calculation, |
| 777 |
+ |
* since the direct component is handled separately. Therefore, any |
| 778 |
+ |
* ambient ray which hits an active light source must be discarded. |
| 779 |
+ |
* The same is true for stray specular samples, since the specular |
| 780 |
+ |
* contribution from light sources is calculated separately. |
| 781 |
+ |
*/ |
| 782 |
+ |
|
| 783 |
+ |
#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
| 784 |
+ |
!(r->crtype&SHADOW || r->rod < 0.0 || \ |
| 785 |
+ |
/* not 100% correct */ distglow(m, r, r->rot))) |
| 786 |
+ |
|
| 787 |
+ |
/* passillum * |
| 788 |
+ |
* |
| 789 |
+ |
* An illum passes to another material type when we didn't hit it |
| 790 |
+ |
* on purpose (as part of a direct calculation), or it is relaying |
| 791 |
+ |
* a virtual light source. |
| 792 |
+ |
*/ |
| 793 |
+ |
|
| 794 |
+ |
#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
| 795 |
+ |
(r->rsrc<0 || source[r->rsrc].so!=r->ro || \ |
| 796 |
+ |
source[r->rsrc].sflags&SVIRTUAL)) |
| 797 |
+ |
|
| 798 |
+ |
/* srcignore * |
| 799 |
+ |
* |
| 800 |
+ |
* The -dv flag is normally on for sources to be visible. |
| 801 |
+ |
*/ |
| 802 |
+ |
|
| 803 |
+ |
#define srcignore(m, r) !(directvis || r->crtype&SHADOW || \ |
| 804 |
+ |
distglow(m, r, raydist(r,PRIMARY))) |
| 805 |
+ |
|
| 806 |
+ |
|
| 807 |
+ |
int |
| 808 |
+ |
m_light( /* ray hit a light source */ |
| 809 |
+ |
register OBJREC *m, |
| 810 |
+ |
register RAY *r |
| 811 |
+ |
) |
| 812 |
+ |
{ |
| 813 |
+ |
/* check for over-counting */ |
| 814 |
+ |
if (badcomponent(m, r)) |
| 815 |
+ |
return(1); |
| 816 |
+ |
if (wrongsource(m, r)) |
| 817 |
+ |
return(1); |
| 818 |
+ |
/* check for passed illum */ |
| 819 |
+ |
if (passillum(m, r)) { |
| 820 |
+ |
if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
| 821 |
+ |
return(rayshade(r,lastmod(objndx(m),m->oargs.sarg[0]))); |
| 822 |
+ |
raytrans(r); |
| 823 |
+ |
return(1); |
| 824 |
+ |
} |
| 825 |
+ |
/* otherwise treat as source */ |
| 826 |
+ |
/* check for behind */ |
| 827 |
+ |
if (r->rod < 0.0) |
| 828 |
+ |
return(1); |
| 829 |
+ |
/* check for invisibility */ |
| 830 |
+ |
if (srcignore(m, r)) |
| 831 |
+ |
return(1); |
| 832 |
+ |
/* check for outside spot */ |
| 833 |
+ |
if (m->otype==MAT_SPOT && spotout(r, makespot(m))) |
| 834 |
+ |
return(1); |
| 835 |
+ |
/* get distribution pattern */ |
| 836 |
+ |
raytexture(r, m->omod); |
| 837 |
+ |
/* get source color */ |
| 838 |
+ |
setcolor(r->rcol, m->oargs.farg[0], |
| 839 |
+ |
m->oargs.farg[1], |
| 840 |
+ |
m->oargs.farg[2]); |
| 841 |
+ |
/* modify value */ |
| 842 |
+ |
multcolor(r->rcol, r->pcol); |
| 843 |
+ |
return(1); |
| 844 |
|
} |
