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/* Copyright (c) 1991 Regents of the University of California */ |
| 2 |
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|
| 1 |
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#ifndef lint |
| 2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
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> |
static const char RCSid[] = "$Id$"; |
| 3 |
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#endif |
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|
| 4 |
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/* |
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* Routines for simulating virtual light sources |
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* Thus far, we only support planar mirrors. |
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+ |
* |
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* External symbols declared in source.h |
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*/ |
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|
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< |
#include "ray.h" |
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> |
#include "copyright.h" |
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|
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+ |
#include "ray.h" |
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#include "otypes.h" |
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< |
|
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> |
#include "otspecial.h" |
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#include "source.h" |
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+ |
#include "random.h" |
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|
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< |
#include "cone.h" |
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> |
#define MINSAMPLES 16 /* minimum number of pretest samples */ |
| 20 |
> |
#define STESTMAX 32 /* maximum seeks per sample */ |
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|
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#include "face.h" |
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|
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|
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double intercircle(); |
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SRCREC *makevsrc(); |
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|
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static OBJECT *vobject; /* virtual source objects */ |
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static int nvobjects = 0; /* number of virtual source objects */ |
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|
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|
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< |
markvirtuals() /* find and mark virtual sources */ |
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> |
static int |
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> |
isident4(MAT4 m) |
| 29 |
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{ |
| 30 |
< |
register OBJREC *o; |
| 31 |
< |
register int i; |
| 30 |
> |
int i, j; |
| 31 |
> |
|
| 32 |
> |
for (i = 4; i--; ) |
| 33 |
> |
for (j = 4; j--; ) |
| 34 |
> |
if (!FABSEQ(m[i][j], i==j)) |
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> |
return(0); |
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> |
return(1); |
| 37 |
> |
} |
| 38 |
> |
|
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> |
|
| 40 |
> |
void |
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> |
markvirtuals(void) /* find and mark virtual sources */ |
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> |
{ |
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> |
OBJREC *o; |
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> |
int i; |
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/* check number of direct relays */ |
| 46 |
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if (directrelay <= 0) |
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return; |
| 48 |
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/* find virtual source objects */ |
| 49 |
< |
for (i = 0; i < nobjects; i++) { |
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> |
for (i = 0; i < nsceneobjs; i++) { |
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o = objptr(i); |
| 51 |
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if (!issurface(o->otype) || o->omod == OVOID) |
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continue; |
| 53 |
< |
if (!isvlight(objptr(o->omod)->otype)) |
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> |
if (!isvlight(vsmaterial(o)->otype)) |
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continue; |
| 55 |
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if (sfun[o->otype].of == NULL || |
| 56 |
< |
sfun[o->otype].of->getpleq == NULL) |
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< |
objerror(o, USER, "illegal material"); |
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> |
sfun[o->otype].of->getpleq == NULL) { |
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> |
objerror(o,WARNING,"secondary sources not supported"); |
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> |
continue; |
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> |
} |
| 60 |
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if (nvobjects == 0) |
| 61 |
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vobject = (OBJECT *)malloc(sizeof(OBJECT)); |
| 62 |
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else |
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< |
vobject = (OBJECT *)realloc((char *)vobject, |
| 63 |
> |
vobject = (OBJECT *)realloc((void *)vobject, |
| 64 |
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(unsigned)(nvobjects+1)*sizeof(OBJECT)); |
| 65 |
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if (vobject == NULL) |
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error(SYSTEM, "out of memory in addvirtuals"); |
| 68 |
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} |
| 69 |
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if (nvobjects == 0) |
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return; |
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#ifdef DEBUG |
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+ |
fprintf(stderr, "found %d virtual source objects\n", nvobjects); |
| 73 |
+ |
#endif |
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/* append virtual sources */ |
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for (i = nsources; i-- > 0; ) |
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< |
if (!(source[i].sflags & SSKIP)) |
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< |
addvirtuals(&source[i], directrelay); |
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> |
addvirtuals(i, directrelay); |
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/* done with our object list */ |
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< |
free((char *)vobject); |
| 78 |
> |
free((void *)vobject); |
| 79 |
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nvobjects = 0; |
| 80 |
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} |
| 81 |
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|
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|
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< |
addvirtuals(sr, nr) /* add virtual sources associated with sr */ |
| 84 |
< |
SRCREC *sr; |
| 85 |
< |
int nr; |
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> |
void |
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> |
addvirtuals( /* add virtuals associated with source */ |
| 85 |
> |
int sn, |
| 86 |
> |
int nr |
| 87 |
> |
) |
| 88 |
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{ |
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< |
register int i; |
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> |
int i; |
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/* check relay limit first */ |
| 91 |
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if (nr <= 0) |
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return; |
| 93 |
+ |
if (source[sn].sflags & SSKIP) |
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+ |
return; |
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/* check each virtual object for projection */ |
| 96 |
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for (i = 0; i < nvobjects; i++) |
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/* vproject() calls us recursively */ |
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< |
vproject(objptr(i), sr, nr-1); |
| 98 |
> |
vproject(objptr(vobject[i]), sn, nr-1); |
| 99 |
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} |
| 100 |
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|
| 101 |
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|
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< |
vproject(o, s, n) /* create projected source(s) if they exist */ |
| 103 |
< |
OBJREC *o; |
| 104 |
< |
SRCREC *s; |
| 105 |
< |
int n; |
| 102 |
> |
void |
| 103 |
> |
vproject( /* create projected source(s) if they exist */ |
| 104 |
> |
OBJREC *o, |
| 105 |
> |
int sn, |
| 106 |
> |
int n |
| 107 |
> |
) |
| 108 |
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{ |
| 109 |
< |
register int i; |
| 110 |
< |
register VSMATERIAL *vsmat; |
| 109 |
> |
int i; |
| 110 |
> |
VSMATERIAL *vsmat; |
| 111 |
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MAT4 proj; |
| 112 |
< |
SRCREC *ns; |
| 112 |
> |
int ns; |
| 113 |
> |
|
| 114 |
> |
if (o == source[sn].so) /* objects cannot project themselves */ |
| 115 |
> |
return; |
| 116 |
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/* get virtual source material */ |
| 117 |
< |
vsmat = sfun[objptr(o->omod)->otype].mf; |
| 117 |
> |
vsmat = sfun[vsmaterial(o)->otype].mf; |
| 118 |
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/* project virtual sources */ |
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for (i = 0; i < vsmat->nproj; i++) |
| 120 |
< |
if ((*vsmat->vproj)(proj, o, s, i)) |
| 121 |
< |
if ((ns = makevsrc(o, s, proj)) != NULL) |
| 120 |
> |
if ((*vsmat->vproj)(proj, o, &source[sn], i)) |
| 121 |
> |
if ((ns = makevsrc(o, sn, proj)) >= 0) { |
| 122 |
> |
source[ns].sa.sv.pn = i; |
| 123 |
> |
#ifdef DEBUG |
| 124 |
> |
virtverb(ns, stderr); |
| 125 |
> |
#endif |
| 126 |
|
addvirtuals(ns, n); |
| 127 |
+ |
} |
| 128 |
|
} |
| 129 |
|
|
| 130 |
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|
| 131 |
< |
SRCREC * |
| 132 |
< |
makevsrc(op, sp, pm) /* make virtual source if reasonable */ |
| 133 |
< |
OBJREC *op; |
| 134 |
< |
register SRCREC *sp; |
| 106 |
< |
MAT4 pm; |
| 131 |
> |
OBJREC * |
| 132 |
> |
vsmaterial( /* get virtual source material pointer */ |
| 133 |
> |
OBJREC *o |
| 134 |
> |
) |
| 135 |
|
{ |
| 136 |
< |
register SRCREC *newsrc; |
| 137 |
< |
FVECT nsloc, ocent, nsnorm; |
| 136 |
> |
int i; |
| 137 |
> |
OBJREC *m; |
| 138 |
> |
|
| 139 |
> |
i = o->omod; |
| 140 |
> |
m = findmaterial(o); |
| 141 |
> |
if (m == NULL) |
| 142 |
> |
return(objptr(i)); |
| 143 |
> |
if (m->otype != MAT_ILLUM || m->oargs.nsargs < 1 || |
| 144 |
> |
!strcmp(m->oargs.sarg[0], VOIDID) || |
| 145 |
> |
(i = lastmod(objndx(m), m->oargs.sarg[0])) == OVOID) |
| 146 |
> |
return(m); /* direct modifier */ |
| 147 |
> |
return(objptr(i)); /* illum alternate */ |
| 148 |
> |
} |
| 149 |
> |
|
| 150 |
> |
|
| 151 |
> |
int |
| 152 |
> |
makevsrc( /* make virtual source if reasonable */ |
| 153 |
> |
OBJREC *op, |
| 154 |
> |
int sn, |
| 155 |
> |
MAT4 pm |
| 156 |
> |
) |
| 157 |
> |
{ |
| 158 |
> |
FVECT nsloc, nsnorm, ocent, v; |
| 159 |
> |
double maxrad2, d; |
| 160 |
|
int nsflags; |
| 111 |
– |
double maxrad2; |
| 112 |
– |
double d1; |
| 161 |
|
SPOT theirspot, ourspot; |
| 162 |
< |
register int i; |
| 163 |
< |
|
| 164 |
< |
nsflags = (sp->sflags|(SVIRTUAL|SFOLLOW)) & ~SSPOT; |
| 162 |
> |
int i; |
| 163 |
> |
/* check for no-op */ |
| 164 |
> |
if (isident4(pm)) |
| 165 |
> |
return(0); |
| 166 |
> |
nsflags = source[sn].sflags | (SVIRTUAL|SSPOT|SFOLLOW); |
| 167 |
|
/* get object center and max. radius */ |
| 168 |
< |
if (sfun[op->otype].of->getdisk != NULL) { |
| 169 |
< |
maxrad2 = (*sfun[op->otype].of->getdisk)(ocent, op); |
| 170 |
< |
if (maxrad2 <= FTINY) /* too small? */ |
| 121 |
< |
return(NULL); |
| 122 |
< |
nsflags |= SSPOT; |
| 123 |
< |
} |
| 168 |
> |
maxrad2 = getdisk(ocent, op, sn); |
| 169 |
> |
if (maxrad2 <= FTINY) /* too small? */ |
| 170 |
> |
return(-1); |
| 171 |
|
/* get location and spot */ |
| 172 |
< |
if (sp->sflags & SDISTANT) { /* distant source */ |
| 173 |
< |
if (sp->sflags & SPROX) |
| 174 |
< |
return(NULL); /* should never get here! */ |
| 175 |
< |
multv3(nsloc, sp->sloc, pm); |
| 176 |
< |
if (nsflags & SSPOT) { |
| 177 |
< |
VCOPY(ourspot.aim, ocent); |
| 178 |
< |
ourspot.siz = PI*maxrad2; |
| 179 |
< |
ourspot.flen = 0.; |
| 172 |
> |
if (source[sn].sflags & SDISTANT) { /* distant source */ |
| 173 |
> |
if (source[sn].sflags & SPROX) |
| 174 |
> |
return(-1); /* should never get here! */ |
| 175 |
> |
multv3(nsloc, source[sn].sloc, pm); |
| 176 |
> |
normalize(nsloc); |
| 177 |
> |
VCOPY(ourspot.aim, ocent); |
| 178 |
> |
ourspot.siz = PI*maxrad2; |
| 179 |
> |
ourspot.flen = -1.; |
| 180 |
> |
if (source[sn].sflags & SSPOT) { |
| 181 |
> |
multp3(theirspot.aim, source[sn].sl.s->aim, pm); |
| 182 |
> |
/* adjust for source size */ |
| 183 |
> |
d = sqrt(dist2(ourspot.aim, theirspot.aim)); |
| 184 |
> |
d = sqrt(source[sn].sl.s->siz/PI) + d*source[sn].srad; |
| 185 |
> |
theirspot.siz = PI*d*d; |
| 186 |
> |
ourspot.flen = theirspot.flen = source[sn].sl.s->flen; |
| 187 |
> |
d = ourspot.siz; |
| 188 |
> |
if (!commonbeam(&ourspot, &theirspot, nsloc)) |
| 189 |
> |
return(-1); /* no overlap */ |
| 190 |
> |
if (ourspot.siz < d-FTINY) { /* it shrunk */ |
| 191 |
> |
d = beamdisk(v, op, &ourspot, nsloc); |
| 192 |
> |
if (d <= FTINY) |
| 193 |
> |
return(-1); |
| 194 |
> |
if (d < maxrad2) { |
| 195 |
> |
maxrad2 = d; |
| 196 |
> |
VCOPY(ocent, v); |
| 197 |
> |
} |
| 198 |
> |
} |
| 199 |
|
} |
| 134 |
– |
if (sp->sflags & SSPOT) { |
| 135 |
– |
copystruct(&theirspot, sp->sl.s); |
| 136 |
– |
multp3(theirspot.aim, sp->sl.s->aim, pm); |
| 137 |
– |
if (nsflags & SSPOT && |
| 138 |
– |
!commonbeam(&ourspot, &theirspot, nsloc)) |
| 139 |
– |
return(NULL); /* no overlap */ |
| 140 |
– |
} |
| 200 |
|
} else { /* local source */ |
| 201 |
< |
multp3(nsloc, sp->sloc, pm); |
| 202 |
< |
if (nsflags & SSPOT) { |
| 203 |
< |
for (i = 0; i < 3; i++) |
| 204 |
< |
ourspot.aim[i] = ocent[i] - nsloc[i]; |
| 205 |
< |
if ((d1 = normalize(ourspot.aim)) == 0.) |
| 206 |
< |
return(NULL); /* at source!! */ |
| 207 |
< |
if (sp->sflags & SPROX && d1 > sp->sl.prox) |
| 208 |
< |
return(NULL); /* too far away */ |
| 209 |
< |
ourspot.siz = 2.*PI*(1. - d1/sqrt(d1*d1+maxrad2)); |
| 210 |
< |
ourspot.flen = 0.; |
| 211 |
< |
} else if (sp->sflags & SPROX) { |
| 212 |
< |
FVECT norm; |
| 213 |
< |
double offs; |
| 214 |
< |
/* use distance from plane */ |
| 215 |
< |
offs = (*sfun[op->otype].of->getpleq)(norm, op); |
| 216 |
< |
d1 = DOT(norm, nsloc) - offs; |
| 217 |
< |
if (d1 > sp->sl.prox || d1 < -sp->sl.prox) |
| 218 |
< |
return(NULL); /* too far away */ |
| 160 |
< |
} |
| 161 |
< |
if (sp->sflags & SSPOT) { |
| 162 |
< |
copystruct(&theirspot, sp->sl.s); |
| 163 |
< |
multv3(theirspot.aim, sp->sl.s->aim, pm); |
| 201 |
> |
multp3(nsloc, source[sn].sloc, pm); |
| 202 |
> |
for (i = 0; i < 3; i++) |
| 203 |
> |
ourspot.aim[i] = ocent[i] - nsloc[i]; |
| 204 |
> |
if ((d = normalize(ourspot.aim)) == 0.) |
| 205 |
> |
return(-1); /* at source!! */ |
| 206 |
> |
if (source[sn].sflags & SPROX && d > source[sn].sl.prox) |
| 207 |
> |
return(-1); /* too far away */ |
| 208 |
> |
ourspot.flen = 0.; |
| 209 |
> |
/* adjust for source size */ |
| 210 |
> |
d = (sqrt(maxrad2) + source[sn].srad) / d; |
| 211 |
> |
if (d < 1.-FTINY) |
| 212 |
> |
ourspot.siz = 2.*PI*(1. - sqrt(1.-d*d)); |
| 213 |
> |
else |
| 214 |
> |
nsflags &= ~SSPOT; |
| 215 |
> |
if (source[sn].sflags & SSPOT) { |
| 216 |
> |
theirspot = *(source[sn].sl.s); |
| 217 |
> |
multv3(theirspot.aim, source[sn].sl.s->aim, pm); |
| 218 |
> |
normalize(theirspot.aim); |
| 219 |
|
if (nsflags & SSPOT) { |
| 165 |
– |
if (!commonspot(&ourspot, &theirspot, nsloc)) |
| 166 |
– |
return(NULL); /* no overlap */ |
| 220 |
|
ourspot.flen = theirspot.flen; |
| 221 |
+ |
d = ourspot.siz; |
| 222 |
+ |
if (!commonspot(&ourspot, &theirspot, nsloc)) |
| 223 |
+ |
return(-1); /* no overlap */ |
| 224 |
+ |
} else { |
| 225 |
+ |
nsflags |= SSPOT; |
| 226 |
+ |
ourspot = theirspot; |
| 227 |
+ |
d = 2.*ourspot.siz; |
| 228 |
|
} |
| 229 |
+ |
if (ourspot.siz < d-FTINY) { /* it shrunk */ |
| 230 |
+ |
d = spotdisk(v, op, &ourspot, nsloc); |
| 231 |
+ |
if (d <= FTINY) |
| 232 |
+ |
return(-1); |
| 233 |
+ |
if (d < maxrad2) { |
| 234 |
+ |
maxrad2 = d; |
| 235 |
+ |
VCOPY(ocent, v); |
| 236 |
+ |
} |
| 237 |
+ |
} |
| 238 |
|
} |
| 239 |
< |
if (sp->sflags & SFLAT) { /* check for behind source */ |
| 240 |
< |
multv3(nsnorm, sp->snorm, pm); |
| 241 |
< |
if (nsflags & SSPOT && checkspot(&ourspot, nsnorm) < 0) |
| 242 |
< |
return(NULL); |
| 239 |
> |
if (source[sn].sflags & SFLAT) { /* behind source? */ |
| 240 |
> |
multv3(nsnorm, source[sn].snorm, pm); |
| 241 |
> |
normalize(nsnorm); |
| 242 |
> |
if (nsflags & SSPOT && !checkspot(&ourspot, nsnorm)) |
| 243 |
> |
return(-1); |
| 244 |
|
} |
| 245 |
|
} |
| 246 |
< |
/* everything is OK, make source */ |
| 247 |
< |
if ((newsrc = newsource()) == NULL) |
| 246 |
> |
/* pretest visibility */ |
| 247 |
> |
nsflags = vstestvis(nsflags, op, ocent, maxrad2, sn); |
| 248 |
> |
if (nsflags & SSKIP) |
| 249 |
> |
return(-1); /* obstructed */ |
| 250 |
> |
/* it all checks out, so make it */ |
| 251 |
> |
if ((i = newsource()) < 0) |
| 252 |
|
goto memerr; |
| 253 |
< |
newsrc->sflags = nsflags; |
| 254 |
< |
VCOPY(newsrc->sloc, nsloc); |
| 253 |
> |
source[i].sflags = nsflags; |
| 254 |
> |
VCOPY(source[i].sloc, nsloc); |
| 255 |
> |
multv3(source[i].ss[SU], source[sn].ss[SU], pm); |
| 256 |
> |
multv3(source[i].ss[SV], source[sn].ss[SV], pm); |
| 257 |
|
if (nsflags & SFLAT) |
| 258 |
< |
VCOPY(newsrc->snorm, nsnorm); |
| 259 |
< |
newsrc->ss = sp->ss; newsrc->ss2 = sp->ss2; |
| 260 |
< |
if ((nsflags | sp->sflags) & SSPOT) { |
| 261 |
< |
if ((newsrc->sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
| 258 |
> |
VCOPY(source[i].snorm, nsnorm); |
| 259 |
> |
else |
| 260 |
> |
multv3(source[i].ss[SW], source[sn].ss[SW], pm); |
| 261 |
> |
source[i].srad = source[sn].srad; |
| 262 |
> |
source[i].ss2 = source[sn].ss2; |
| 263 |
> |
if (nsflags & SSPOT) { |
| 264 |
> |
if ((source[i].sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
| 265 |
|
goto memerr; |
| 266 |
< |
if (nsflags & SSPOT) |
| 188 |
< |
copystruct(newsrc->sl.s, &ourspot); |
| 189 |
< |
else |
| 190 |
< |
copystruct(newsrc->sl.s, &theirspot); |
| 191 |
< |
newsrc->sflags |= SSPOT; |
| 266 |
> |
*(source[i].sl.s) = ourspot; |
| 267 |
|
} |
| 268 |
|
if (nsflags & SPROX) |
| 269 |
< |
newsrc->sl.prox = sp->sl.prox; |
| 270 |
< |
newsrc->sa.svnext = sp - source; |
| 271 |
< |
return(newsrc); |
| 269 |
> |
source[i].sl.prox = source[sn].sl.prox; |
| 270 |
> |
source[i].sa.sv.sn = sn; |
| 271 |
> |
source[i].so = op; |
| 272 |
> |
return(i); |
| 273 |
|
memerr: |
| 274 |
|
error(SYSTEM, "out of memory in makevsrc"); |
| 275 |
+ |
return -1; /* pro forma return */ |
| 276 |
|
} |
| 277 |
|
|
| 278 |
|
|
| 279 |
< |
commonspot(sp1, sp2, org) /* set sp1 to intersection of sp1 and sp2 */ |
| 280 |
< |
register SPOT *sp1, *sp2; |
| 281 |
< |
FVECT org; |
| 279 |
> |
double |
| 280 |
> |
getdisk( /* get visible object disk */ |
| 281 |
> |
FVECT oc, |
| 282 |
> |
OBJREC *op, |
| 283 |
> |
int sn |
| 284 |
> |
) |
| 285 |
|
{ |
| 286 |
< |
FVECT cent; |
| 287 |
< |
double rad2, cos1, cos2; |
| 288 |
< |
|
| 289 |
< |
cos1 = 1. - sp1->siz/(2.*PI); |
| 290 |
< |
cos2 = 1. - sp2->siz/(2.*PI); |
| 291 |
< |
if (sp2->siz >= 2.*PI-FTINY) /* BIG, just check overlap */ |
| 292 |
< |
return(DOT(sp1->aim,sp2->aim) >= cos1*cos2 - |
| 293 |
< |
sqrt((1.-cos1*cos1)*(1.-cos2*cos2))); |
| 294 |
< |
/* compute and check disks */ |
| 295 |
< |
rad2 = intercircle(cent, sp1->aim, sp2->aim, |
| 296 |
< |
1./(cos1*cos1) - 1., 1./(cos2*cos2) - 1.); |
| 297 |
< |
if (rad2 <= FTINY || normalize(cent) == 0.) |
| 298 |
< |
return(0); |
| 299 |
< |
VCOPY(sp1->aim, cent); |
| 300 |
< |
sp1->siz = 2.*PI*(1. - 1./sqrt(1.+rad2)); |
| 301 |
< |
return(1); |
| 286 |
> |
double rad2, roffs, offs, d, rd, rdoto; |
| 287 |
> |
FVECT rnrm, nrm; |
| 288 |
> |
/* first, use object getdisk function */ |
| 289 |
> |
rad2 = getmaxdisk(oc, op); |
| 290 |
> |
if (!(source[sn].sflags & SVIRTUAL)) |
| 291 |
> |
return(rad2); /* all done for normal source */ |
| 292 |
> |
/* check for correct side of relay surface */ |
| 293 |
> |
roffs = getplaneq(rnrm, source[sn].so); |
| 294 |
> |
rd = DOT(rnrm, source[sn].sloc); /* source projection */ |
| 295 |
> |
if (!(source[sn].sflags & SDISTANT)) |
| 296 |
> |
rd -= roffs; |
| 297 |
> |
d = DOT(rnrm, oc) - roffs; /* disk distance to relay plane */ |
| 298 |
> |
if ((d > 0.) ^ (rd > 0.)) |
| 299 |
> |
return(rad2); /* OK if opposite sides */ |
| 300 |
> |
if (d*d >= rad2) |
| 301 |
> |
return(0.); /* no relay is possible */ |
| 302 |
> |
/* we need a closer look */ |
| 303 |
> |
offs = getplaneq(nrm, op); |
| 304 |
> |
rdoto = DOT(rnrm, nrm); |
| 305 |
> |
if (d*d >= rad2*(1.-rdoto*rdoto)) |
| 306 |
> |
return(0.); /* disk entirely on projection side */ |
| 307 |
> |
/* should shrink disk but I'm lazy */ |
| 308 |
> |
return(rad2); |
| 309 |
|
} |
| 310 |
|
|
| 311 |
|
|
| 312 |
< |
commonbeam(sp1, sp2, dir) /* set sp1 to intersection of sp1 and sp2 */ |
| 313 |
< |
register SPOT *sp1, *sp2; |
| 314 |
< |
FVECT dir; |
| 312 |
> |
int |
| 313 |
> |
vstestvis( /* pretest source visibility */ |
| 314 |
> |
int f, /* virtual source flags */ |
| 315 |
> |
OBJREC *o, /* relay object */ |
| 316 |
> |
FVECT oc, /* relay object center */ |
| 317 |
> |
double or2, /* relay object radius squared */ |
| 318 |
> |
int sn /* target source number */ |
| 319 |
> |
) |
| 320 |
|
{ |
| 321 |
< |
FVECT cent, c1, c2; |
| 322 |
< |
double rad2, d; |
| 323 |
< |
register int i; |
| 324 |
< |
/* move centers to common plane */ |
| 325 |
< |
d = DOT(sp1->aim, dir); |
| 326 |
< |
for (i = 0; i < 3; i++) |
| 327 |
< |
c1[i] = sp1->aim[i] - d*dir[i]; |
| 328 |
< |
d = DOT(sp2->aim, dir); |
| 329 |
< |
for (i = 0; i < 3; i++) |
| 330 |
< |
c2[i] = sp2->aim[i] - d*dir[i]; |
| 331 |
< |
/* compute overlap */ |
| 332 |
< |
rad2 = intercircle(cent, c1, c2, sp1->siz/PI, sp2->siz/PI); |
| 333 |
< |
if (rad2 <= FTINY) |
| 334 |
< |
return(0); |
| 335 |
< |
VCOPY(sp1->aim, cent); |
| 336 |
< |
sp1->siz = PI*rad2; |
| 337 |
< |
return(1); |
| 246 |
< |
} |
| 247 |
< |
|
| 248 |
< |
|
| 249 |
< |
checkspot(sp, nrm) /* check spotlight for behind source */ |
| 250 |
< |
register SPOT *sp; |
| 251 |
< |
FVECT nrm; |
| 252 |
< |
{ |
| 253 |
< |
double d, d1; |
| 254 |
< |
|
| 255 |
< |
d = DOT(sp->aim, nrm); |
| 256 |
< |
if (d > FTINY) /* center in front? */ |
| 257 |
< |
return(0); |
| 258 |
< |
/* else check horizon */ |
| 259 |
< |
d1 = 1. - sp->siz/(2.*PI); |
| 260 |
< |
return(1.-FTINY-d*d > d1*d1); |
| 261 |
< |
} |
| 262 |
< |
|
| 263 |
< |
|
| 264 |
< |
double |
| 265 |
< |
intercircle(cc, c1, c2, r1s, r2s) /* intersect two circles */ |
| 266 |
< |
FVECT cc; /* midpoint (return value) */ |
| 267 |
< |
FVECT c1, c2; /* circle centers */ |
| 268 |
< |
double r1s, r2s; /* radii squared */ |
| 269 |
< |
{ |
| 270 |
< |
double a2, d2, l; |
| 271 |
< |
FVECT disp; |
| 272 |
< |
register int i; |
| 273 |
< |
|
| 274 |
< |
for (i = 0; i < 3; i++) |
| 275 |
< |
disp[i] = c2[i] - c1[i]; |
| 276 |
< |
d2 = DOT(disp,disp); |
| 277 |
< |
/* circle within overlap? */ |
| 278 |
< |
if (r1s < r2s) { |
| 279 |
< |
if (r2s >= r1s + d2) { |
| 280 |
< |
VCOPY(cc, c1); |
| 281 |
< |
return(r1s); |
| 282 |
< |
} |
| 321 |
> |
RAY sr; |
| 322 |
> |
FVECT onorm; |
| 323 |
> |
double offsdir[3]; |
| 324 |
> |
SRCINDEX si; |
| 325 |
> |
double or, d, d1; |
| 326 |
> |
int stestlim, ssn; |
| 327 |
> |
int nhit, nok; |
| 328 |
> |
int i, n; |
| 329 |
> |
/* return if pretesting disabled */ |
| 330 |
> |
if (vspretest <= 0) |
| 331 |
> |
return(f); |
| 332 |
> |
/* get surface normal */ |
| 333 |
> |
getplaneq(onorm, o); |
| 334 |
> |
/* set number of rays to sample */ |
| 335 |
> |
if (source[sn].sflags & SDISTANT) { |
| 336 |
> |
/* 32. == heuristic constant */ |
| 337 |
> |
n = 32.*or2/(thescene.cusize*thescene.cusize)*vspretest + .5; |
| 338 |
|
} else { |
| 339 |
< |
if (r1s >= r2s + d2) { |
| 340 |
< |
VCOPY(cc, c2); |
| 341 |
< |
return(r2s); |
| 339 |
> |
VSUB(offsdir, source[sn].sloc, oc); |
| 340 |
> |
d = DOT(offsdir,offsdir); |
| 341 |
> |
if (d <= FTINY) |
| 342 |
> |
n = 2.*PI * vspretest + .5; |
| 343 |
> |
else |
| 344 |
> |
n = 2.*PI * (1.-sqrt(1./(1.+or2/d)))*vspretest + .5; |
| 345 |
> |
} |
| 346 |
> |
if (n < MINSAMPLES) n = MINSAMPLES; |
| 347 |
> |
#ifdef DEBUG |
| 348 |
> |
fprintf(stderr, "pretesting source %d in object %s with %d rays\n", |
| 349 |
> |
sn, o->oname, n); |
| 350 |
> |
#endif |
| 351 |
> |
/* sample */ |
| 352 |
> |
or = sqrt(or2); |
| 353 |
> |
stestlim = n*STESTMAX; |
| 354 |
> |
ssn = 0; |
| 355 |
> |
nhit = nok = 0; |
| 356 |
> |
initsrcindex(&si); |
| 357 |
> |
while (n-- > 0) { |
| 358 |
> |
/* get sample point */ |
| 359 |
> |
do { |
| 360 |
> |
if (ssn >= stestlim) { |
| 361 |
> |
#ifdef DEBUG |
| 362 |
> |
fprintf(stderr, "\ttoo hard to hit\n"); |
| 363 |
> |
#endif |
| 364 |
> |
return(f); /* too small a target! */ |
| 365 |
> |
} |
| 366 |
> |
multisamp(offsdir, 3, urand(sn*931+5827+ssn)); |
| 367 |
> |
for (i = 0; i < 3; i++) |
| 368 |
> |
offsdir[i] = or*(1. - 2.*offsdir[i]); |
| 369 |
> |
ssn++; |
| 370 |
> |
d = 1. - DOT(offsdir, onorm); |
| 371 |
> |
for (i = 0; i < 3; i++) { |
| 372 |
> |
sr.rorg[i] = oc[i] + offsdir[i] + d*onorm[i]; |
| 373 |
> |
sr.rdir[i] = -onorm[i]; |
| 374 |
> |
} |
| 375 |
> |
sr.rmax = 0.0; |
| 376 |
> |
rayorigin(&sr, PRIMARY, NULL, NULL); |
| 377 |
> |
} while (!(*ofun[o->otype].funp)(o, &sr)); |
| 378 |
> |
/* check against source */ |
| 379 |
> |
VCOPY(sr.rorg, sr.rop); /* starting from intersection */ |
| 380 |
> |
samplendx++; |
| 381 |
> |
if (si.sp >= si.np-1 || |
| 382 |
> |
!srcray(&sr, NULL, &si) || sr.rsrc != sn) { |
| 383 |
> |
si.sn = sn-1; /* reset index to our source */ |
| 384 |
> |
si.np = 0; |
| 385 |
> |
if (!srcray(&sr, NULL, &si) || sr.rsrc != sn) |
| 386 |
> |
continue; /* can't get there from here */ |
| 387 |
|
} |
| 388 |
+ |
sr.revf = srcvalue; |
| 389 |
+ |
rayvalue(&sr); /* check sample validity */ |
| 390 |
+ |
if ((d = bright(sr.rcol)) <= FTINY) |
| 391 |
+ |
continue; |
| 392 |
+ |
nok++; /* got sample; check obstructions */ |
| 393 |
+ |
rayclear(&sr); |
| 394 |
+ |
sr.revf = raytrace; |
| 395 |
+ |
rayvalue(&sr); |
| 396 |
+ |
if ((d1 = bright(sr.rcol)) > FTINY) { |
| 397 |
+ |
if (d - d1 > FTINY) { |
| 398 |
+ |
#ifdef DEBUG |
| 399 |
+ |
fprintf(stderr, "\tpartially shadowed\n"); |
| 400 |
+ |
#endif |
| 401 |
+ |
return(f); /* intervening transmitter */ |
| 402 |
+ |
} |
| 403 |
+ |
nhit++; |
| 404 |
+ |
} |
| 405 |
+ |
if (nhit > 0 && nhit < nok) { |
| 406 |
+ |
#ifdef DEBUG |
| 407 |
+ |
fprintf(stderr, "\tpartially occluded\n"); |
| 408 |
+ |
#endif |
| 409 |
+ |
return(f); /* need to shadow test */ |
| 410 |
+ |
} |
| 411 |
|
} |
| 412 |
< |
a2 = .25*(2.*(r1s+r2s) - d2 - (r2s-r1s)*(r2s-r1s)/d2); |
| 413 |
< |
/* no overlap? */ |
| 414 |
< |
if (a2 <= 0.) |
| 415 |
< |
return(0.); |
| 416 |
< |
/* overlap, compute center */ |
| 417 |
< |
l = sqrt((r1s - a2)/d2); |
| 418 |
< |
for (i = 0; i < 3; i++) |
| 419 |
< |
cc[i] = c1[i] + l*disp[i]; |
| 420 |
< |
return(a2); |
| 412 |
> |
if (nhit == 0) { |
| 413 |
> |
#ifdef DEBUG |
| 414 |
> |
fprintf(stderr, "\t0%% hit rate\n"); |
| 415 |
> |
#endif |
| 416 |
> |
return(f | SSKIP); /* 0% hit rate: totally occluded */ |
| 417 |
> |
} |
| 418 |
> |
#ifdef DEBUG |
| 419 |
> |
fprintf(stderr, "\t100%% hit rate\n"); |
| 420 |
> |
#endif |
| 421 |
> |
return(f & ~SFOLLOW); /* 100% hit rate: no occlusion */ |
| 422 |
|
} |
| 423 |
+ |
|
| 424 |
+ |
|
| 425 |
+ |
#ifdef DEBUG |
| 426 |
+ |
void |
| 427 |
+ |
virtverb( /* print verbose description of virtual source */ |
| 428 |
+ |
int sn, |
| 429 |
+ |
FILE *fp |
| 430 |
+ |
) |
| 431 |
+ |
{ |
| 432 |
+ |
fprintf(fp, "%s virtual source %d in %s %s\n", |
| 433 |
+ |
source[sn].sflags & SDISTANT ? "distant" : "local", |
| 434 |
+ |
sn, ofun[source[sn].so->otype].funame, |
| 435 |
+ |
source[sn].so->oname); |
| 436 |
+ |
fprintf(fp, "\tat (%f,%f,%f)\n", |
| 437 |
+ |
source[sn].sloc[0], source[sn].sloc[1], source[sn].sloc[2]); |
| 438 |
+ |
fprintf(fp, "\tlinked to source %d (%s)\n", |
| 439 |
+ |
source[sn].sa.sv.sn, source[source[sn].sa.sv.sn].so->oname); |
| 440 |
+ |
if (source[sn].sflags & SFOLLOW) |
| 441 |
+ |
fprintf(fp, "\talways followed\n"); |
| 442 |
+ |
else |
| 443 |
+ |
fprintf(fp, "\tnever followed\n"); |
| 444 |
+ |
if (!(source[sn].sflags & SSPOT)) |
| 445 |
+ |
return; |
| 446 |
+ |
fprintf(fp, "\twith spot aim (%f,%f,%f) and size %f\n", |
| 447 |
+ |
source[sn].sl.s->aim[0], source[sn].sl.s->aim[1], |
| 448 |
+ |
source[sn].sl.s->aim[2], source[sn].sl.s->siz); |
| 449 |
+ |
} |
| 450 |
+ |
#endif |
