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/* Copyright (c) 1991 Regents of the University of California */ |
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/* Copyright (c) 1994 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#include "ray.h" |
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|
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#include "octree.h" |
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|
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#include "otypes.h" |
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|
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#include "source.h" |
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|
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#include "random.h" |
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|
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double intercircle(), getdisk(); |
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#define MINSAMPLES 16 /* minimum number of pretest samples */ |
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> |
#define STESTMAX 32 /* maximum seeks per sample */ |
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|
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+ |
|
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double getdisk(); |
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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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o = objptr(i); |
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if (!issurface(o->otype) || o->omod == OVOID) |
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continue; |
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< |
if (!isvlight(objptr(o->omod)->otype)) |
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> |
if (!isvlight(vsmaterial(o)->otype)) |
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continue; |
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if (sfun[o->otype].of == NULL || |
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< |
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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} |
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if (nvobjects == 0) |
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vobject = (OBJECT *)malloc(sizeof(OBJECT)); |
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else |
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#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(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); |
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nvobjects = 0; |
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/* check relay limit first */ |
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if (nr <= 0) |
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return; |
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+ |
if (source[sn].sflags & SSKIP) |
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return; |
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/* check each virtual object for projection */ |
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for (i = 0; i < nvobjects; i++) |
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/* vproject() calls us recursively */ |
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if (o == source[sn].so) /* objects cannot project themselves */ |
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return; |
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/* get virtual source material */ |
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< |
vsmat = sfun[objptr(o->omod)->otype].mf; |
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> |
vsmat = sfun[vsmaterial(o)->otype].mf; |
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/* project virtual sources */ |
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for (i = 0; i < vsmat->nproj; i++) |
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if ((*vsmat->vproj)(proj, o, &source[sn], i)) |
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if ((ns = makevsrc(o, sn, proj)) >= 0) { |
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source[ns].sa.sv.pn = i; |
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#ifdef DEBUG |
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virtverb(ns, stderr); |
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#endif |
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} |
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|
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OBJREC * |
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vsmaterial(o) /* get virtual source material pointer */ |
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OBJREC *o; |
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{ |
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register int i; |
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register OBJREC *m; |
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|
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i = o->omod; |
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m = objptr(i); |
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if (m->otype != MAT_ILLUM || m->oargs.nsargs < 1 || |
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!strcmp(m->oargs.sarg[0], VOIDID) || |
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(i = modifier(m->oargs.sarg[0])) == OVOID) |
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return(m); /* direct modifier */ |
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return(objptr(i)); /* illum alternate */ |
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} |
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|
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|
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int |
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makevsrc(op, sn, pm) /* make virtual source if reasonable */ |
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OBJREC *op; |
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register int sn; |
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MAT4 pm; |
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{ |
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< |
FVECT nsloc, nsnorm, ocent; |
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double maxrad2; |
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FVECT nsloc, nsnorm, ocent, v; |
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double maxrad2, d; |
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int nsflags; |
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double d1; |
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SPOT theirspot, ourspot; |
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register int i; |
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|
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if (source[sn].sflags & SPROX) |
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return(-1); /* should never get here! */ |
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multv3(nsloc, source[sn].sloc, pm); |
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normalize(nsloc); |
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VCOPY(ourspot.aim, ocent); |
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ourspot.siz = PI*maxrad2; |
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ourspot.flen = 0.; |
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if (source[sn].sflags & SSPOT) { |
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copystruct(&theirspot, source[sn].sl.s); |
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multp3(theirspot.aim, source[sn].sl.s->aim, pm); |
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/* adjust for source size */ |
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d = sqrt(dist2(ourspot.aim, theirspot.aim)); |
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d = sqrt(source[sn].sl.s->siz/PI) + d*source[sn].srad; |
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theirspot.siz = PI*d*d; |
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ourspot.flen = theirspot.flen = source[sn].sl.s->flen; |
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d = ourspot.siz; |
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if (!commonbeam(&ourspot, &theirspot, nsloc)) |
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< |
return(-1); /* no overlap */ |
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> |
return(-1); /* no overlap */ |
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> |
if (ourspot.siz < d-FTINY) { /* it shrunk */ |
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> |
d = beamdisk(v, op, &ourspot, nsloc); |
| 173 |
> |
if (d <= FTINY) |
| 174 |
> |
return(-1); |
| 175 |
> |
if (d < maxrad2) { |
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> |
maxrad2 = d; |
| 177 |
> |
VCOPY(ocent, v); |
| 178 |
> |
} |
| 179 |
> |
} |
| 180 |
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} |
| 181 |
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} else { /* local source */ |
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multp3(nsloc, source[sn].sloc, pm); |
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for (i = 0; i < 3; i++) |
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ourspot.aim[i] = ocent[i] - nsloc[i]; |
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< |
if ((d1 = normalize(ourspot.aim)) == 0.) |
| 185 |
> |
if ((d = normalize(ourspot.aim)) == 0.) |
| 186 |
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return(-1); /* at source!! */ |
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< |
if (source[sn].sflags & SPROX && d1 > source[sn].sl.prox) |
| 187 |
> |
if (source[sn].sflags & SPROX && d > source[sn].sl.prox) |
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return(-1); /* too far away */ |
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ourspot.siz = 2.*PI*(1. - d1/sqrt(d1*d1+maxrad2)); |
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ourspot.flen = 0.; |
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+ |
/* adjust for source size */ |
| 191 |
+ |
d = (sqrt(maxrad2) + source[sn].srad) / d; |
| 192 |
+ |
if (d < 1.-FTINY) |
| 193 |
+ |
ourspot.siz = 2.*PI*(1. - sqrt(1.-d*d)); |
| 194 |
+ |
else |
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+ |
nsflags &= ~SSPOT; |
| 196 |
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if (source[sn].sflags & SSPOT) { |
| 197 |
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copystruct(&theirspot, source[sn].sl.s); |
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multv3(theirspot.aim, source[sn].sl.s->aim, pm); |
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< |
if (!commonspot(&ourspot, &theirspot, nsloc)) |
| 200 |
< |
return(-1); /* no overlap */ |
| 201 |
< |
ourspot.flen = theirspot.flen; |
| 199 |
> |
normalize(theirspot.aim); |
| 200 |
> |
if (nsflags & SSPOT) { |
| 201 |
> |
ourspot.flen = theirspot.flen; |
| 202 |
> |
d = ourspot.siz; |
| 203 |
> |
if (!commonspot(&ourspot, &theirspot, nsloc)) |
| 204 |
> |
return(-1); /* no overlap */ |
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> |
} else { |
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> |
nsflags |= SSPOT; |
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> |
copystruct(&ourspot, &theirspot); |
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> |
d = 2.*ourspot.siz; |
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> |
} |
| 210 |
> |
if (ourspot.siz < d-FTINY) { /* it shrunk */ |
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> |
d = spotdisk(v, op, &ourspot, nsloc); |
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> |
if (d <= FTINY) |
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return(-1); |
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> |
if (d < maxrad2) { |
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maxrad2 = d; |
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> |
VCOPY(ocent, v); |
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> |
} |
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> |
} |
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} |
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if (source[sn].sflags & SFLAT) { /* behind source? */ |
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multv3(nsnorm, source[sn].snorm, pm); |
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if (checkspot(&ourspot, nsnorm) < 0) |
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> |
normalize(nsnorm); |
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> |
if (nsflags & SSPOT && !checkspot(&ourspot, nsnorm)) |
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return(-1); |
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} |
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} |
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/* everything is OK, make source */ |
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> |
/* pretest visibility */ |
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> |
nsflags = vstestvis(nsflags, op, ocent, maxrad2, sn); |
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> |
if (nsflags & SSKIP) |
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> |
return(-1); /* obstructed */ |
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> |
/* it all checks out, so make it */ |
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if ((i = newsource()) < 0) |
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goto memerr; |
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source[i].sflags = nsflags; |
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VCOPY(source[i].sloc, nsloc); |
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+ |
multv3(source[i].ss[SU], source[sn].ss[SU], pm); |
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multv3(source[i].ss[SV], source[sn].ss[SV], pm); |
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if (nsflags & SFLAT) |
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VCOPY(source[i].snorm, nsnorm); |
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< |
source[i].ss = source[sn].ss; source[i].ss2 = source[sn].ss2; |
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< |
if ((source[i].sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
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< |
goto memerr; |
| 243 |
< |
copystruct(source[i].sl.s, &ourspot); |
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> |
else |
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> |
multv3(source[i].ss[SW], source[sn].ss[SW], pm); |
| 242 |
> |
source[i].srad = source[sn].srad; |
| 243 |
> |
source[i].ss2 = source[sn].ss2; |
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> |
if (nsflags & SSPOT) { |
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> |
if ((source[i].sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
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> |
goto memerr; |
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> |
copystruct(source[i].sl.s, &ourspot); |
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> |
} |
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if (nsflags & SPROX) |
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source[i].sl.prox = source[sn].sl.prox; |
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< |
source[i].sa.svnext = sn; |
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> |
source[i].sa.sv.sn = sn; |
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source[i].so = op; |
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return(i); |
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memerr: |
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double rad2, roffs, offs, d, rd, rdoto; |
| 266 |
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FVECT rnrm, nrm; |
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/* first, use object getdisk function */ |
| 268 |
< |
rad2 = (*sfun[op->otype].of->getdisk)(oc, op); |
| 268 |
> |
rad2 = getmaxdisk(oc, op); |
| 269 |
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if (!(source[sn].sflags & SVIRTUAL)) |
| 270 |
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return(rad2); /* all done for normal source */ |
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/* check for correct side of relay surface */ |
| 272 |
< |
roffs = (*sfun[source[sn].so->otype].of->getpleq)(rnrm, source[sn].so); |
| 272 |
> |
roffs = getplaneq(rnrm, source[sn].so); |
| 273 |
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rd = DOT(rnrm, source[sn].sloc); /* source projection */ |
| 274 |
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if (!(source[sn].sflags & SDISTANT)) |
| 275 |
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rd -= roffs; |
| 277 |
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if ((d > 0.) ^ (rd > 0.)) |
| 278 |
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return(rad2); /* OK if opposite sides */ |
| 279 |
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if (d*d >= rad2) |
| 280 |
< |
return(.0); /* no relay is possible */ |
| 280 |
> |
return(0.); /* no relay is possible */ |
| 281 |
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/* we need a closer look */ |
| 282 |
< |
offs = (*sfun[op->otype].of->getpleq)(nrm, op); |
| 282 |
> |
offs = getplaneq(nrm, op); |
| 283 |
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rdoto = DOT(rnrm, nrm); |
| 284 |
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if (d*d >= rad2*(1.-rdoto*rdoto)) |
| 285 |
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return(0.); /* disk entirely on projection side */ |
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} |
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|
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|
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< |
commonspot(sp1, sp2, org) /* set sp1 to intersection of sp1 and sp2 */ |
| 292 |
< |
register SPOT *sp1, *sp2; |
| 293 |
< |
FVECT org; |
| 291 |
> |
int |
| 292 |
> |
vstestvis(f, o, oc, or2, sn) /* pretest source visibility */ |
| 293 |
> |
int f; /* virtual source flags */ |
| 294 |
> |
OBJREC *o; /* relay object */ |
| 295 |
> |
FVECT oc; /* relay object center */ |
| 296 |
> |
double or2; /* relay object radius squared */ |
| 297 |
> |
register int sn; /* target source number */ |
| 298 |
|
{ |
| 299 |
< |
FVECT cent; |
| 300 |
< |
double rad2, cos1, cos2; |
| 301 |
< |
|
| 302 |
< |
cos1 = 1. - sp1->siz/(2.*PI); |
| 303 |
< |
cos2 = 1. - sp2->siz/(2.*PI); |
| 304 |
< |
if (sp2->siz >= 2.*PI-FTINY) /* BIG, just check overlap */ |
| 305 |
< |
return(DOT(sp1->aim,sp2->aim) >= cos1*cos2 - |
| 306 |
< |
sqrt((1.-cos1*cos1)*(1.-cos2*cos2))); |
| 307 |
< |
/* compute and check disks */ |
| 308 |
< |
rad2 = intercircle(cent, sp1->aim, sp2->aim, |
| 309 |
< |
1./(cos1*cos1) - 1., 1./(cos2*cos2) - 1.); |
| 310 |
< |
if (rad2 <= FTINY || normalize(cent) == 0.) |
| 311 |
< |
return(0); |
| 312 |
< |
VCOPY(sp1->aim, cent); |
| 313 |
< |
sp1->siz = 2.*PI*(1. - 1./sqrt(1.+rad2)); |
| 314 |
< |
return(1); |
| 315 |
< |
} |
| 316 |
< |
|
| 317 |
< |
|
| 238 |
< |
commonbeam(sp1, sp2, dir) /* set sp1 to intersection of sp1 and sp2 */ |
| 239 |
< |
register SPOT *sp1, *sp2; |
| 240 |
< |
FVECT dir; |
| 241 |
< |
{ |
| 242 |
< |
FVECT cent, c1, c2; |
| 243 |
< |
double rad2, d; |
| 244 |
< |
register int i; |
| 245 |
< |
/* move centers to common plane */ |
| 246 |
< |
d = DOT(sp1->aim, dir); |
| 247 |
< |
for (i = 0; i < 3; i++) |
| 248 |
< |
c1[i] = sp1->aim[i] - d*dir[i]; |
| 249 |
< |
d = DOT(sp2->aim, dir); |
| 250 |
< |
for (i = 0; i < 3; i++) |
| 251 |
< |
c2[i] = sp2->aim[i] - d*dir[i]; |
| 252 |
< |
/* compute overlap */ |
| 253 |
< |
rad2 = intercircle(cent, c1, c2, sp1->siz/PI, sp2->siz/PI); |
| 254 |
< |
if (rad2 <= FTINY) |
| 255 |
< |
return(0); |
| 256 |
< |
VCOPY(sp1->aim, cent); |
| 257 |
< |
sp1->siz = PI*rad2; |
| 258 |
< |
return(1); |
| 259 |
< |
} |
| 260 |
< |
|
| 261 |
< |
|
| 262 |
< |
checkspot(sp, nrm) /* check spotlight for behind source */ |
| 263 |
< |
register SPOT *sp; |
| 264 |
< |
FVECT nrm; |
| 265 |
< |
{ |
| 266 |
< |
double d, d1; |
| 267 |
< |
|
| 268 |
< |
d = DOT(sp->aim, nrm); |
| 269 |
< |
if (d > FTINY) /* center in front? */ |
| 270 |
< |
return(0); |
| 271 |
< |
/* else check horizon */ |
| 272 |
< |
d1 = 1. - sp->siz/(2.*PI); |
| 273 |
< |
return(1.-FTINY-d*d > d1*d1); |
| 274 |
< |
} |
| 275 |
< |
|
| 276 |
< |
|
| 277 |
< |
double |
| 278 |
< |
intercircle(cc, c1, c2, r1s, r2s) /* intersect two circles */ |
| 279 |
< |
FVECT cc; /* midpoint (return value) */ |
| 280 |
< |
FVECT c1, c2; /* circle centers */ |
| 281 |
< |
double r1s, r2s; /* radii squared */ |
| 282 |
< |
{ |
| 283 |
< |
double a2, d2, l; |
| 284 |
< |
FVECT disp; |
| 285 |
< |
register int i; |
| 286 |
< |
|
| 287 |
< |
for (i = 0; i < 3; i++) |
| 288 |
< |
disp[i] = c2[i] - c1[i]; |
| 289 |
< |
d2 = DOT(disp,disp); |
| 290 |
< |
/* circle within overlap? */ |
| 291 |
< |
if (r1s < r2s) { |
| 292 |
< |
if (r2s >= r1s + d2) { |
| 293 |
< |
VCOPY(cc, c1); |
| 294 |
< |
return(r1s); |
| 295 |
< |
} |
| 299 |
> |
RAY sr; |
| 300 |
> |
FVECT onorm; |
| 301 |
> |
FVECT offsdir; |
| 302 |
> |
SRCINDEX si; |
| 303 |
> |
double or, d; |
| 304 |
> |
int infront; |
| 305 |
> |
int stestlim, ssn; |
| 306 |
> |
int nhit, nok; |
| 307 |
> |
register int i, n; |
| 308 |
> |
/* return if pretesting disabled */ |
| 309 |
> |
if (vspretest <= 0) |
| 310 |
> |
return(f); |
| 311 |
> |
/* get surface normal */ |
| 312 |
> |
getplaneq(onorm, o); |
| 313 |
> |
/* set number of rays to sample */ |
| 314 |
> |
if (source[sn].sflags & SDISTANT) { |
| 315 |
> |
/* 32. == heuristic constant */ |
| 316 |
> |
n = 32.*or2/(thescene.cusize*thescene.cusize)*vspretest + .5; |
| 317 |
> |
infront = DOT(onorm, source[sn].sloc) > 0.; |
| 318 |
|
} else { |
| 319 |
< |
if (r1s >= r2s + d2) { |
| 320 |
< |
VCOPY(cc, c2); |
| 321 |
< |
return(r2s); |
| 319 |
> |
for (i = 0; i < 3; i++) |
| 320 |
> |
offsdir[i] = source[sn].sloc[i] - oc[i]; |
| 321 |
> |
d = DOT(offsdir,offsdir); |
| 322 |
> |
if (d <= FTINY) |
| 323 |
> |
n = 2.*PI * vspretest + .5; |
| 324 |
> |
else |
| 325 |
> |
n = 2.*PI * (1.-sqrt(1./(1.+or2/d)))*vspretest + .5; |
| 326 |
> |
infront = DOT(onorm, offsdir) > 0.; |
| 327 |
> |
} |
| 328 |
> |
if (n < MINSAMPLES) n = MINSAMPLES; |
| 329 |
> |
#ifdef DEBUG |
| 330 |
> |
fprintf(stderr, "pretesting source %d in object %s with %d rays\n", |
| 331 |
> |
sn, o->oname, n); |
| 332 |
> |
#endif |
| 333 |
> |
/* sample */ |
| 334 |
> |
or = sqrt(or2); |
| 335 |
> |
stestlim = n*STESTMAX; |
| 336 |
> |
ssn = 0; |
| 337 |
> |
nhit = nok = 0; |
| 338 |
> |
while (n-- > 0) { |
| 339 |
> |
/* get sample point */ |
| 340 |
> |
do { |
| 341 |
> |
if (ssn >= stestlim) { |
| 342 |
> |
#ifdef DEBUG |
| 343 |
> |
fprintf(stderr, "\ttoo hard to hit\n"); |
| 344 |
> |
#endif |
| 345 |
> |
return(f); /* too small a target! */ |
| 346 |
> |
} |
| 347 |
> |
multisamp(offsdir, 3, urand(sn*931+5827+ssn)); |
| 348 |
> |
for (i = 0; i < 3; i++) |
| 349 |
> |
offsdir[i] = or*(1. - 2.*offsdir[i]); |
| 350 |
> |
ssn++; |
| 351 |
> |
for (i = 0; i < 3; i++) |
| 352 |
> |
sr.rorg[i] = oc[i] + offsdir[i]; |
| 353 |
> |
d = DOT(offsdir,onorm); |
| 354 |
> |
sr.rmax = 0.0; |
| 355 |
> |
if (infront) |
| 356 |
> |
for (i = 0; i < 3; i++) { |
| 357 |
> |
sr.rorg[i] -= (d-.0001)*onorm[i]; |
| 358 |
> |
sr.rdir[i] = -onorm[i]; |
| 359 |
> |
} |
| 360 |
> |
else |
| 361 |
> |
for (i = 0; i < 3; i++) { |
| 362 |
> |
sr.rorg[i] -= (d+.0001)*onorm[i]; |
| 363 |
> |
sr.rdir[i] = onorm[i]; |
| 364 |
> |
} |
| 365 |
> |
rayorigin(&sr, NULL, PRIMARY, 1.0); |
| 366 |
> |
} while (!(*ofun[o->otype].funp)(o, &sr)); |
| 367 |
> |
/* check against source */ |
| 368 |
> |
initsrcindex(&si); |
| 369 |
> |
si.sn = sn; |
| 370 |
> |
nopart(&si, &sr); |
| 371 |
> |
samplendx++; |
| 372 |
> |
if (!srcray(&sr, NULL, &si) || sr.rsrc != sn) |
| 373 |
> |
continue; |
| 374 |
> |
sr.revf = srcvalue; |
| 375 |
> |
rayvalue(&sr); |
| 376 |
> |
if (bright(sr.rcol) <= FTINY) |
| 377 |
> |
continue; |
| 378 |
> |
nok++; |
| 379 |
> |
/* check against obstructions */ |
| 380 |
> |
rayclear(&sr); |
| 381 |
> |
sr.revf = raytrace; |
| 382 |
> |
rayvalue(&sr); |
| 383 |
> |
if (bright(sr.rcol) > FTINY) |
| 384 |
> |
nhit++; |
| 385 |
> |
if (nhit > 0 && nhit < nok) { |
| 386 |
> |
#ifdef DEBUG |
| 387 |
> |
fprintf(stderr, "\tpartially occluded\n"); |
| 388 |
> |
#endif |
| 389 |
> |
return(f); /* need to shadow test */ |
| 390 |
|
} |
| 391 |
|
} |
| 392 |
< |
a2 = .25*(2.*(r1s+r2s) - d2 - (r2s-r1s)*(r2s-r1s)/d2); |
| 393 |
< |
/* no overlap? */ |
| 394 |
< |
if (a2 <= 0.) |
| 395 |
< |
return(0.); |
| 396 |
< |
/* overlap, compute center */ |
| 397 |
< |
l = sqrt((r1s - a2)/d2); |
| 398 |
< |
for (i = 0; i < 3; i++) |
| 399 |
< |
cc[i] = c1[i] + l*disp[i]; |
| 400 |
< |
return(a2); |
| 392 |
> |
if (nhit == 0) { |
| 393 |
> |
#ifdef DEBUG |
| 394 |
> |
fprintf(stderr, "\t0%% hit rate\n"); |
| 395 |
> |
#endif |
| 396 |
> |
return(f | SSKIP); /* 0% hit rate: totally occluded */ |
| 397 |
> |
} |
| 398 |
> |
#ifdef DEBUG |
| 399 |
> |
fprintf(stderr, "\t100%% hit rate\n"); |
| 400 |
> |
#endif |
| 401 |
> |
return(f & ~SFOLLOW); /* 100% hit rate: no occlusion */ |
| 402 |
|
} |
| 403 |
+ |
|
| 404 |
|
|
| 313 |
– |
|
| 405 |
|
#ifdef DEBUG |
| 406 |
|
virtverb(sn, fp) /* print verbose description of virtual source */ |
| 407 |
|
register int sn; |
| 416 |
|
fprintf(fp, "\tat (%f,%f,%f)\n", |
| 417 |
|
source[sn].sloc[0], source[sn].sloc[1], source[sn].sloc[2]); |
| 418 |
|
fprintf(fp, "\tlinked to source %d (%s)\n", |
| 419 |
< |
source[sn].sa.svnext, source[source[sn].sa.svnext].so->oname); |
| 419 |
> |
source[sn].sa.sv.sn, source[source[sn].sa.sv.sn].so->oname); |
| 420 |
|
if (source[sn].sflags & SFOLLOW) |
| 421 |
|
fprintf(fp, "\talways followed\n"); |
| 422 |
|
else |
