| 1 |
greg |
1.1 |
/* Copyright (c) 1991 Regents of the University of California */ |
| 2 |
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| 3 |
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#ifndef lint |
| 4 |
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static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
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#endif |
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| 7 |
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/* |
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* Routines for simulating virtual light sources |
| 9 |
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* Thus far, we only support planar mirrors. |
| 10 |
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*/ |
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| 12 |
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#include "ray.h" |
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| 14 |
greg |
1.7 |
#include "octree.h" |
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| 16 |
greg |
1.3 |
#include "otypes.h" |
| 17 |
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| 18 |
greg |
1.1 |
#include "source.h" |
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| 20 |
greg |
1.7 |
#include "random.h" |
| 21 |
greg |
1.1 |
|
| 22 |
greg |
1.13 |
#define MINSAMPLES 3 /* minimum number of pretest samples */ |
| 23 |
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#define STESTMAX 30 /* maximum seeks per sample */ |
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greg |
1.1 |
|
| 25 |
greg |
1.13 |
|
| 26 |
greg |
1.7 |
double getdisk(); |
| 27 |
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| 28 |
greg |
1.1 |
static OBJECT *vobject; /* virtual source objects */ |
| 29 |
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static int nvobjects = 0; /* number of virtual source objects */ |
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| 32 |
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markvirtuals() /* find and mark virtual sources */ |
| 33 |
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{ |
| 34 |
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register OBJREC *o; |
| 35 |
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register int i; |
| 36 |
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/* check number of direct relays */ |
| 37 |
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if (directrelay <= 0) |
| 38 |
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return; |
| 39 |
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/* find virtual source objects */ |
| 40 |
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for (i = 0; i < nobjects; i++) { |
| 41 |
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o = objptr(i); |
| 42 |
greg |
1.3 |
if (!issurface(o->otype) || o->omod == OVOID) |
| 43 |
greg |
1.1 |
continue; |
| 44 |
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if (!isvlight(objptr(o->omod)->otype)) |
| 45 |
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continue; |
| 46 |
greg |
1.3 |
if (sfun[o->otype].of == NULL || |
| 47 |
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sfun[o->otype].of->getpleq == NULL) |
| 48 |
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objerror(o, USER, "illegal material"); |
| 49 |
greg |
1.1 |
if (nvobjects == 0) |
| 50 |
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vobject = (OBJECT *)malloc(sizeof(OBJECT)); |
| 51 |
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else |
| 52 |
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vobject = (OBJECT *)realloc((char *)vobject, |
| 53 |
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(unsigned)(nvobjects+1)*sizeof(OBJECT)); |
| 54 |
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if (vobject == NULL) |
| 55 |
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error(SYSTEM, "out of memory in addvirtuals"); |
| 56 |
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vobject[nvobjects++] = i; |
| 57 |
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} |
| 58 |
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if (nvobjects == 0) |
| 59 |
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return; |
| 60 |
greg |
1.4 |
#ifdef DEBUG |
| 61 |
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fprintf(stderr, "found %d virtual source objects\n", nvobjects); |
| 62 |
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#endif |
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greg |
1.1 |
/* append virtual sources */ |
| 64 |
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for (i = nsources; i-- > 0; ) |
| 65 |
greg |
1.7 |
addvirtuals(i, directrelay); |
| 66 |
greg |
1.1 |
/* done with our object list */ |
| 67 |
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free((char *)vobject); |
| 68 |
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nvobjects = 0; |
| 69 |
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} |
| 70 |
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| 71 |
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| 72 |
greg |
1.4 |
addvirtuals(sn, nr) /* add virtuals associated with source */ |
| 73 |
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int sn; |
| 74 |
greg |
1.1 |
int nr; |
| 75 |
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{ |
| 76 |
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register int i; |
| 77 |
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/* check relay limit first */ |
| 78 |
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if (nr <= 0) |
| 79 |
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return; |
| 80 |
greg |
1.7 |
if (source[sn].sflags & SSKIP) |
| 81 |
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return; |
| 82 |
greg |
1.1 |
/* check each virtual object for projection */ |
| 83 |
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for (i = 0; i < nvobjects; i++) |
| 84 |
greg |
1.3 |
/* vproject() calls us recursively */ |
| 85 |
greg |
1.4 |
vproject(objptr(vobject[i]), sn, nr-1); |
| 86 |
greg |
1.1 |
} |
| 87 |
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| 88 |
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| 89 |
greg |
1.4 |
vproject(o, sn, n) /* create projected source(s) if they exist */ |
| 90 |
greg |
1.3 |
OBJREC *o; |
| 91 |
greg |
1.4 |
int sn; |
| 92 |
greg |
1.3 |
int n; |
| 93 |
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{ |
| 94 |
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register int i; |
| 95 |
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register VSMATERIAL *vsmat; |
| 96 |
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MAT4 proj; |
| 97 |
greg |
1.4 |
int ns; |
| 98 |
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| 99 |
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if (o == source[sn].so) /* objects cannot project themselves */ |
| 100 |
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return; |
| 101 |
greg |
1.3 |
/* get virtual source material */ |
| 102 |
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vsmat = sfun[objptr(o->omod)->otype].mf; |
| 103 |
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/* project virtual sources */ |
| 104 |
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for (i = 0; i < vsmat->nproj; i++) |
| 105 |
greg |
1.4 |
if ((*vsmat->vproj)(proj, o, &source[sn], i)) |
| 106 |
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if ((ns = makevsrc(o, sn, proj)) >= 0) { |
| 107 |
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#ifdef DEBUG |
| 108 |
greg |
1.6 |
virtverb(ns, stderr); |
| 109 |
greg |
1.4 |
#endif |
| 110 |
greg |
1.3 |
addvirtuals(ns, n); |
| 111 |
greg |
1.4 |
} |
| 112 |
greg |
1.3 |
} |
| 113 |
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| 114 |
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| 115 |
greg |
1.4 |
int |
| 116 |
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makevsrc(op, sn, pm) /* make virtual source if reasonable */ |
| 117 |
greg |
1.1 |
OBJREC *op; |
| 118 |
greg |
1.4 |
register int sn; |
| 119 |
greg |
1.1 |
MAT4 pm; |
| 120 |
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{ |
| 121 |
greg |
1.9 |
FVECT nsloc, nsnorm, ocent, v; |
| 122 |
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double maxrad2, d; |
| 123 |
greg |
1.3 |
int nsflags; |
| 124 |
greg |
1.1 |
SPOT theirspot, ourspot; |
| 125 |
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register int i; |
| 126 |
greg |
1.3 |
|
| 127 |
greg |
1.6 |
nsflags = source[sn].sflags | (SVIRTUAL|SSPOT|SFOLLOW); |
| 128 |
greg |
1.1 |
/* get object center and max. radius */ |
| 129 |
greg |
1.6 |
maxrad2 = getdisk(ocent, op, sn); |
| 130 |
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if (maxrad2 <= FTINY) /* too small? */ |
| 131 |
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return(-1); |
| 132 |
greg |
1.1 |
/* get location and spot */ |
| 133 |
greg |
1.4 |
if (source[sn].sflags & SDISTANT) { /* distant source */ |
| 134 |
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if (source[sn].sflags & SPROX) |
| 135 |
greg |
1.5 |
return(-1); /* should never get here! */ |
| 136 |
greg |
1.4 |
multv3(nsloc, source[sn].sloc, pm); |
| 137 |
greg |
1.6 |
VCOPY(ourspot.aim, ocent); |
| 138 |
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ourspot.siz = PI*maxrad2; |
| 139 |
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ourspot.flen = 0.; |
| 140 |
greg |
1.4 |
if (source[sn].sflags & SSPOT) { |
| 141 |
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copystruct(&theirspot, source[sn].sl.s); |
| 142 |
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multp3(theirspot.aim, source[sn].sl.s->aim, pm); |
| 143 |
greg |
1.9 |
d = ourspot.siz; |
| 144 |
greg |
1.6 |
if (!commonbeam(&ourspot, &theirspot, nsloc)) |
| 145 |
greg |
1.9 |
return(-1); /* no overlap */ |
| 146 |
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if (ourspot.siz < d-FTINY) { /* it shrunk */ |
| 147 |
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d = beamdisk(v, op, &ourspot, nsloc); |
| 148 |
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if (d <= FTINY) |
| 149 |
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return(-1); |
| 150 |
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if (d < maxrad2) { |
| 151 |
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maxrad2 = d; |
| 152 |
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VCOPY(ocent, v); |
| 153 |
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} |
| 154 |
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} |
| 155 |
greg |
1.1 |
} |
| 156 |
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} else { /* local source */ |
| 157 |
greg |
1.4 |
multp3(nsloc, source[sn].sloc, pm); |
| 158 |
greg |
1.6 |
for (i = 0; i < 3; i++) |
| 159 |
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ourspot.aim[i] = ocent[i] - nsloc[i]; |
| 160 |
greg |
1.9 |
if ((d = normalize(ourspot.aim)) == 0.) |
| 161 |
greg |
1.6 |
return(-1); /* at source!! */ |
| 162 |
greg |
1.9 |
if (source[sn].sflags & SPROX && d > source[sn].sl.prox) |
| 163 |
greg |
1.6 |
return(-1); /* too far away */ |
| 164 |
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ourspot.flen = 0.; |
| 165 |
greg |
1.14 |
if (d*d > maxrad2) |
| 166 |
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ourspot.siz = 2.*PI*(1. - sqrt(1.-maxrad2/(d*d))); |
| 167 |
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else |
| 168 |
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nsflags &= ~SSPOT; |
| 169 |
greg |
1.4 |
if (source[sn].sflags & SSPOT) { |
| 170 |
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copystruct(&theirspot, source[sn].sl.s); |
| 171 |
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multv3(theirspot.aim, source[sn].sl.s->aim, pm); |
| 172 |
greg |
1.14 |
if (nsflags & SSPOT) { |
| 173 |
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ourspot.flen = theirspot.flen; |
| 174 |
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d = ourspot.siz; |
| 175 |
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if (!commonspot(&ourspot, &theirspot, nsloc)) |
| 176 |
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return(-1); /* no overlap */ |
| 177 |
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} else { |
| 178 |
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nsflags |= SSPOT; |
| 179 |
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copystruct(&ourspot, &theirspot); |
| 180 |
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d = 2.*ourspot.siz; |
| 181 |
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} |
| 182 |
greg |
1.9 |
if (ourspot.siz < d-FTINY) { /* it shrunk */ |
| 183 |
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d = spotdisk(v, op, &ourspot, nsloc); |
| 184 |
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if (d <= FTINY) |
| 185 |
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return(-1); |
| 186 |
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if (d < maxrad2) { |
| 187 |
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maxrad2 = d; |
| 188 |
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VCOPY(ocent, v); |
| 189 |
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} |
| 190 |
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} |
| 191 |
greg |
1.1 |
} |
| 192 |
greg |
1.4 |
if (source[sn].sflags & SFLAT) { /* behind source? */ |
| 193 |
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multv3(nsnorm, source[sn].snorm, pm); |
| 194 |
greg |
1.12 |
if (!checkspot(&ourspot, nsnorm)) |
| 195 |
greg |
1.5 |
return(-1); |
| 196 |
greg |
1.1 |
} |
| 197 |
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} |
| 198 |
greg |
1.7 |
/* pretest visibility */ |
| 199 |
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nsflags = vstestvis(nsflags, op, ocent, maxrad2, sn); |
| 200 |
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if (nsflags & SSKIP) |
| 201 |
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return(-1); /* obstructed */ |
| 202 |
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/* it all checks out, so make it */ |
| 203 |
greg |
1.6 |
if ((i = newsource()) < 0) |
| 204 |
greg |
1.1 |
goto memerr; |
| 205 |
greg |
1.6 |
source[i].sflags = nsflags; |
| 206 |
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VCOPY(source[i].sloc, nsloc); |
| 207 |
greg |
1.3 |
if (nsflags & SFLAT) |
| 208 |
greg |
1.6 |
VCOPY(source[i].snorm, nsnorm); |
| 209 |
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source[i].ss = source[sn].ss; source[i].ss2 = source[sn].ss2; |
| 210 |
greg |
1.14 |
if (nsflags & SSPOT) { |
| 211 |
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if ((source[i].sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
| 212 |
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goto memerr; |
| 213 |
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copystruct(source[i].sl.s, &ourspot); |
| 214 |
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} |
| 215 |
greg |
1.3 |
if (nsflags & SPROX) |
| 216 |
greg |
1.6 |
source[i].sl.prox = source[sn].sl.prox; |
| 217 |
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source[i].sa.svnext = sn; |
| 218 |
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source[i].so = op; |
| 219 |
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return(i); |
| 220 |
greg |
1.1 |
memerr: |
| 221 |
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error(SYSTEM, "out of memory in makevsrc"); |
| 222 |
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} |
| 223 |
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| 224 |
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| 225 |
greg |
1.6 |
double |
| 226 |
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getdisk(oc, op, sn) /* get visible object disk */ |
| 227 |
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FVECT oc; |
| 228 |
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OBJREC *op; |
| 229 |
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register int sn; |
| 230 |
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{ |
| 231 |
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double rad2, roffs, offs, d, rd, rdoto; |
| 232 |
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FVECT rnrm, nrm; |
| 233 |
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/* first, use object getdisk function */ |
| 234 |
greg |
1.9 |
rad2 = getmaxdisk(oc, op); |
| 235 |
greg |
1.6 |
if (!(source[sn].sflags & SVIRTUAL)) |
| 236 |
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return(rad2); /* all done for normal source */ |
| 237 |
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/* check for correct side of relay surface */ |
| 238 |
greg |
1.9 |
roffs = getplaneq(rnrm, source[sn].so); |
| 239 |
greg |
1.6 |
rd = DOT(rnrm, source[sn].sloc); /* source projection */ |
| 240 |
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if (!(source[sn].sflags & SDISTANT)) |
| 241 |
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rd -= roffs; |
| 242 |
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d = DOT(rnrm, oc) - roffs; /* disk distance to relay plane */ |
| 243 |
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if ((d > 0.) ^ (rd > 0.)) |
| 244 |
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return(rad2); /* OK if opposite sides */ |
| 245 |
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if (d*d >= rad2) |
| 246 |
greg |
1.9 |
return(0.); /* no relay is possible */ |
| 247 |
greg |
1.6 |
/* we need a closer look */ |
| 248 |
greg |
1.9 |
offs = getplaneq(nrm, op); |
| 249 |
greg |
1.6 |
rdoto = DOT(rnrm, nrm); |
| 250 |
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if (d*d >= rad2*(1.-rdoto*rdoto)) |
| 251 |
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return(0.); /* disk entirely on projection side */ |
| 252 |
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/* should shrink disk but I'm lazy */ |
| 253 |
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return(rad2); |
| 254 |
|
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} |
| 255 |
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| 256 |
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| 257 |
greg |
1.7 |
int |
| 258 |
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vstestvis(f, o, oc, or2, sn) /* pretest source visibility */ |
| 259 |
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int f; /* virtual source flags */ |
| 260 |
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OBJREC *o; /* relay object */ |
| 261 |
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FVECT oc; /* relay object center */ |
| 262 |
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double or2; /* relay object radius squared */ |
| 263 |
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register int sn; /* target source number */ |
| 264 |
greg |
1.1 |
{ |
| 265 |
greg |
1.7 |
RAY sr; |
| 266 |
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FVECT onorm; |
| 267 |
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FVECT offsdir; |
| 268 |
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double or, d; |
| 269 |
greg |
1.8 |
int infront; |
| 270 |
|
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int ssn; |
| 271 |
greg |
1.11 |
int nhit, nok; |
| 272 |
greg |
1.7 |
register int i, n; |
| 273 |
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/* return if pretesting disabled */ |
| 274 |
|
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if (vspretest <= 0) |
| 275 |
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return(f); |
| 276 |
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/* get surface normal */ |
| 277 |
greg |
1.9 |
getplaneq(onorm, o); |
| 278 |
greg |
1.7 |
/* set number of rays to sample */ |
| 279 |
greg |
1.8 |
if (source[sn].sflags & SDISTANT) { |
| 280 |
greg |
1.7 |
n = (2./3.*PI*PI)*or2/(thescene.cusize*thescene.cusize)* |
| 281 |
|
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vspretest + .5; |
| 282 |
greg |
1.8 |
infront = DOT(onorm, source[sn].sloc) > 0.; |
| 283 |
|
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} else { |
| 284 |
|
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for (i = 0; i < 3; i++) |
| 285 |
|
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offsdir[i] = source[sn].sloc[i] - oc[i]; |
| 286 |
greg |
1.9 |
n = or2/DOT(offsdir,offsdir)*vspretest + .5; |
| 287 |
greg |
1.8 |
infront = DOT(onorm, offsdir) > 0.; |
| 288 |
|
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} |
| 289 |
greg |
1.13 |
if (n < MINSAMPLES) n = MINSAMPLES; |
| 290 |
greg |
1.9 |
#ifdef DEBUG |
| 291 |
|
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fprintf(stderr, "pretesting source %d in object %s with %d rays\n", |
| 292 |
|
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sn, o->oname, n); |
| 293 |
|
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#endif |
| 294 |
greg |
1.7 |
/* sample */ |
| 295 |
greg |
1.8 |
or = sqrt(or2); |
| 296 |
greg |
1.13 |
ssn = STESTMAX*n; |
| 297 |
greg |
1.11 |
nhit = nok = 0; |
| 298 |
greg |
1.7 |
while (n-- > 0) { |
| 299 |
greg |
1.8 |
/* get sample point */ |
| 300 |
|
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do { |
| 301 |
greg |
1.9 |
if (--ssn < 0) { |
| 302 |
|
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#ifdef DEBUG |
| 303 |
|
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fprintf(stderr, "\ttoo hard to hit\n"); |
| 304 |
|
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#endif |
| 305 |
greg |
1.8 |
return(f); /* too small a target! */ |
| 306 |
greg |
1.9 |
} |
| 307 |
greg |
1.8 |
for (i = 0; i < 3; i++) |
| 308 |
|
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offsdir[i] = or*(1. - |
| 309 |
|
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2.*urand(931*i+5827+ssn)); |
| 310 |
|
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for (i = 0; i < 3; i++) |
| 311 |
|
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sr.rorg[i] = oc[i] + offsdir[i]; |
| 312 |
|
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d = DOT(offsdir,onorm); |
| 313 |
|
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if (infront) |
| 314 |
|
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for (i = 0; i < 3; i++) { |
| 315 |
|
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sr.rorg[i] -= (d-.0001)*onorm[i]; |
| 316 |
|
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sr.rdir[i] = -onorm[i]; |
| 317 |
|
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} |
| 318 |
|
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else |
| 319 |
|
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for (i = 0; i < 3; i++) { |
| 320 |
|
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sr.rorg[i] -= (d+.0001)*onorm[i]; |
| 321 |
|
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sr.rdir[i] = onorm[i]; |
| 322 |
|
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} |
| 323 |
|
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rayorigin(&sr, NULL, PRIMARY, 1.0); |
| 324 |
|
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} while (!(*ofun[o->otype].funp)(o, &sr)); |
| 325 |
|
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/* check against source */ |
| 326 |
greg |
1.7 |
samplendx++; |
| 327 |
greg |
1.9 |
if (srcray(&sr, NULL, sn) == 0.) |
| 328 |
greg |
1.7 |
continue; |
| 329 |
|
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sr.revf = srcvalue; |
| 330 |
|
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rayvalue(&sr); |
| 331 |
|
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if (bright(sr.rcol) <= FTINY) |
| 332 |
|
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continue; |
| 333 |
greg |
1.11 |
nok++; |
| 334 |
greg |
1.7 |
/* check against obstructions */ |
| 335 |
|
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srcray(&sr, NULL, sn); |
| 336 |
|
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rayvalue(&sr); |
| 337 |
greg |
1.11 |
if (bright(sr.rcol) > FTINY) |
| 338 |
|
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nhit++; |
| 339 |
|
|
if (nhit > 0 && nhit < nok) { |
| 340 |
greg |
1.9 |
#ifdef DEBUG |
| 341 |
greg |
1.11 |
fprintf(stderr, "\tpartially occluded\n"); |
| 342 |
greg |
1.9 |
#endif |
| 343 |
greg |
1.11 |
return(f); /* need to shadow test */ |
| 344 |
|
|
} |
| 345 |
greg |
1.1 |
} |
| 346 |
greg |
1.9 |
if (nhit == 0) { |
| 347 |
|
|
#ifdef DEBUG |
| 348 |
|
|
fprintf(stderr, "\t0%% hit rate\n"); |
| 349 |
|
|
#endif |
| 350 |
greg |
1.7 |
return(f | SSKIP); /* 0% hit rate: totally occluded */ |
| 351 |
greg |
1.9 |
} |
| 352 |
|
|
#ifdef DEBUG |
| 353 |
|
|
fprintf(stderr, "\t100%% hit rate\n"); |
| 354 |
|
|
#endif |
| 355 |
|
|
return(f & ~SFOLLOW); /* 100% hit rate: no occlusion */ |
| 356 |
greg |
1.1 |
} |
| 357 |
greg |
1.7 |
|
| 358 |
greg |
1.4 |
|
| 359 |
|
|
#ifdef DEBUG |
| 360 |
greg |
1.6 |
virtverb(sn, fp) /* print verbose description of virtual source */ |
| 361 |
|
|
register int sn; |
| 362 |
greg |
1.4 |
FILE *fp; |
| 363 |
|
|
{ |
| 364 |
|
|
register int i; |
| 365 |
|
|
|
| 366 |
|
|
fprintf(fp, "%s virtual source %d in %s %s\n", |
| 367 |
greg |
1.6 |
source[sn].sflags & SDISTANT ? "distant" : "local", |
| 368 |
|
|
sn, ofun[source[sn].so->otype].funame, |
| 369 |
|
|
source[sn].so->oname); |
| 370 |
greg |
1.4 |
fprintf(fp, "\tat (%f,%f,%f)\n", |
| 371 |
greg |
1.6 |
source[sn].sloc[0], source[sn].sloc[1], source[sn].sloc[2]); |
| 372 |
greg |
1.4 |
fprintf(fp, "\tlinked to source %d (%s)\n", |
| 373 |
greg |
1.6 |
source[sn].sa.svnext, source[source[sn].sa.svnext].so->oname); |
| 374 |
|
|
if (source[sn].sflags & SFOLLOW) |
| 375 |
greg |
1.4 |
fprintf(fp, "\talways followed\n"); |
| 376 |
|
|
else |
| 377 |
|
|
fprintf(fp, "\tnever followed\n"); |
| 378 |
greg |
1.6 |
if (!(source[sn].sflags & SSPOT)) |
| 379 |
greg |
1.4 |
return; |
| 380 |
|
|
fprintf(fp, "\twith spot aim (%f,%f,%f) and size %f\n", |
| 381 |
greg |
1.6 |
source[sn].sl.s->aim[0], source[sn].sl.s->aim[1], |
| 382 |
|
|
source[sn].sl.s->aim[2], source[sn].sl.s->siz); |
| 383 |
greg |
1.4 |
} |
| 384 |
|
|
#endif |
