| 11 |
|
|
| 12 |
|
#include "ray.h" |
| 13 |
|
|
| 14 |
+ |
#include "octree.h" |
| 15 |
+ |
|
| 16 |
|
#include "otypes.h" |
| 17 |
|
|
| 18 |
|
#include "source.h" |
| 19 |
|
|
| 20 |
+ |
#include "random.h" |
| 21 |
|
|
| 19 |
– |
double intercircle(); |
| 22 |
|
|
| 23 |
+ |
#define DISKTFRAC 0.25 /* disk area pretest fraction */ |
| 24 |
+ |
|
| 25 |
+ |
double getdisk(); |
| 26 |
+ |
|
| 27 |
|
static OBJECT *vobject; /* virtual source objects */ |
| 28 |
|
static int nvobjects = 0; /* number of virtual source objects */ |
| 29 |
|
|
| 61 |
|
#endif |
| 62 |
|
/* append virtual sources */ |
| 63 |
|
for (i = nsources; i-- > 0; ) |
| 64 |
< |
if (!(source[i].sflags & SSKIP)) |
| 59 |
< |
addvirtuals(i, directrelay); |
| 64 |
> |
addvirtuals(i, directrelay); |
| 65 |
|
/* done with our object list */ |
| 66 |
|
free((char *)vobject); |
| 67 |
|
nvobjects = 0; |
| 76 |
|
/* check relay limit first */ |
| 77 |
|
if (nr <= 0) |
| 78 |
|
return; |
| 79 |
+ |
if (source[sn].sflags & SSKIP) |
| 80 |
+ |
return; |
| 81 |
|
/* check each virtual object for projection */ |
| 82 |
|
for (i = 0; i < nvobjects; i++) |
| 83 |
|
/* vproject() calls us recursively */ |
| 104 |
|
if ((*vsmat->vproj)(proj, o, &source[sn], i)) |
| 105 |
|
if ((ns = makevsrc(o, sn, proj)) >= 0) { |
| 106 |
|
#ifdef DEBUG |
| 107 |
< |
virtverb(&source[ns], stderr); |
| 107 |
> |
virtverb(ns, stderr); |
| 108 |
|
#endif |
| 109 |
|
addvirtuals(ns, n); |
| 110 |
|
} |
| 117 |
|
register int sn; |
| 118 |
|
MAT4 pm; |
| 119 |
|
{ |
| 120 |
< |
register int nsn; |
| 114 |
< |
FVECT nsloc, ocent, nsnorm; |
| 115 |
< |
int nsflags; |
| 120 |
> |
FVECT nsloc, nsnorm, ocent; |
| 121 |
|
double maxrad2; |
| 122 |
+ |
int nsflags; |
| 123 |
|
double d1; |
| 124 |
|
SPOT theirspot, ourspot; |
| 125 |
|
register int i; |
| 126 |
|
|
| 127 |
< |
nsflags = (source[sn].sflags|(SVIRTUAL|SFOLLOW)) & ~SSPOT; |
| 127 |
> |
nsflags = source[sn].sflags | (SVIRTUAL|SSPOT|SFOLLOW); |
| 128 |
|
/* get object center and max. radius */ |
| 129 |
< |
if (sfun[op->otype].of->getdisk != NULL) { |
| 130 |
< |
maxrad2 = (*sfun[op->otype].of->getdisk)(ocent, op); |
| 131 |
< |
if (maxrad2 <= FTINY) /* too small? */ |
| 126 |
< |
return(-1); |
| 127 |
< |
nsflags |= SSPOT; |
| 128 |
< |
} |
| 129 |
> |
maxrad2 = getdisk(ocent, op, sn); |
| 130 |
> |
if (maxrad2 <= FTINY) /* too small? */ |
| 131 |
> |
return(-1); |
| 132 |
|
/* get location and spot */ |
| 133 |
|
if (source[sn].sflags & SDISTANT) { /* distant source */ |
| 134 |
|
if (source[sn].sflags & SPROX) |
| 135 |
|
return(-1); /* should never get here! */ |
| 136 |
|
multv3(nsloc, source[sn].sloc, pm); |
| 137 |
< |
if (nsflags & SSPOT) { |
| 138 |
< |
VCOPY(ourspot.aim, ocent); |
| 139 |
< |
ourspot.siz = PI*maxrad2; |
| 137 |
< |
ourspot.flen = 0.; |
| 138 |
< |
} |
| 137 |
> |
VCOPY(ourspot.aim, ocent); |
| 138 |
> |
ourspot.siz = PI*maxrad2; |
| 139 |
> |
ourspot.flen = 0.; |
| 140 |
|
if (source[sn].sflags & SSPOT) { |
| 141 |
|
copystruct(&theirspot, source[sn].sl.s); |
| 142 |
|
multp3(theirspot.aim, source[sn].sl.s->aim, pm); |
| 143 |
< |
if (nsflags & SSPOT && |
| 143 |
< |
!commonbeam(&ourspot, &theirspot, nsloc)) |
| 143 |
> |
if (!commonbeam(&ourspot, &theirspot, nsloc)) |
| 144 |
|
return(-1); /* no overlap */ |
| 145 |
|
} |
| 146 |
|
} else { /* local source */ |
| 147 |
|
multp3(nsloc, source[sn].sloc, pm); |
| 148 |
< |
if (nsflags & SSPOT) { |
| 149 |
< |
for (i = 0; i < 3; i++) |
| 150 |
< |
ourspot.aim[i] = ocent[i] - nsloc[i]; |
| 151 |
< |
if ((d1 = normalize(ourspot.aim)) == 0.) |
| 152 |
< |
return(-1); /* at source!! */ |
| 153 |
< |
if (source[sn].sflags & SPROX && |
| 154 |
< |
d1 > source[sn].sl.prox) |
| 155 |
< |
return(-1); /* too far away */ |
| 156 |
< |
ourspot.siz = 2.*PI*(1. - d1/sqrt(d1*d1+maxrad2)); |
| 157 |
< |
ourspot.flen = 0.; |
| 158 |
< |
} else if (source[sn].sflags & SPROX) { |
| 159 |
< |
FVECT norm; |
| 160 |
< |
double offs; |
| 161 |
< |
/* use distance from plane */ |
| 162 |
< |
offs = (*sfun[op->otype].of->getpleq)(norm, op); |
| 163 |
< |
d1 = DOT(norm, nsloc) - offs; |
| 164 |
< |
if (d1 < 0.) d1 = -d1; |
| 165 |
< |
if (d1 > source[sn].sl.prox) |
| 166 |
< |
return(-1); /* too far away */ |
| 167 |
< |
} |
| 148 |
> |
for (i = 0; i < 3; i++) |
| 149 |
> |
ourspot.aim[i] = ocent[i] - nsloc[i]; |
| 150 |
> |
if ((d1 = normalize(ourspot.aim)) == 0.) |
| 151 |
> |
return(-1); /* at source!! */ |
| 152 |
> |
if (source[sn].sflags & SPROX && d1 > source[sn].sl.prox) |
| 153 |
> |
return(-1); /* too far away */ |
| 154 |
> |
ourspot.siz = 2.*PI*(1. - d1/sqrt(d1*d1+maxrad2)); |
| 155 |
> |
ourspot.flen = 0.; |
| 156 |
|
if (source[sn].sflags & SSPOT) { |
| 157 |
|
copystruct(&theirspot, source[sn].sl.s); |
| 158 |
|
multv3(theirspot.aim, source[sn].sl.s->aim, pm); |
| 159 |
< |
if (nsflags & SSPOT) { |
| 160 |
< |
if (!commonspot(&ourspot, &theirspot, nsloc)) |
| 161 |
< |
return(-1); /* no overlap */ |
| 174 |
< |
ourspot.flen = theirspot.flen; |
| 175 |
< |
} |
| 159 |
> |
if (!commonspot(&ourspot, &theirspot, nsloc)) |
| 160 |
> |
return(-1); /* no overlap */ |
| 161 |
> |
ourspot.flen = theirspot.flen; |
| 162 |
|
} |
| 163 |
|
if (source[sn].sflags & SFLAT) { /* behind source? */ |
| 164 |
|
multv3(nsnorm, source[sn].snorm, pm); |
| 165 |
< |
if (nsflags & SSPOT && checkspot(&ourspot, nsnorm) < 0) |
| 165 |
> |
if (checkspot(&ourspot, nsnorm) < 0) |
| 166 |
|
return(-1); |
| 167 |
|
} |
| 168 |
|
} |
| 169 |
< |
/* everything is OK, make source */ |
| 170 |
< |
if ((nsn = newsource()) < 0) |
| 169 |
> |
/* pretest visibility */ |
| 170 |
> |
nsflags = vstestvis(nsflags, op, ocent, maxrad2, sn); |
| 171 |
> |
if (nsflags & SSKIP) |
| 172 |
> |
return(-1); /* obstructed */ |
| 173 |
> |
/* it all checks out, so make it */ |
| 174 |
> |
if ((i = newsource()) < 0) |
| 175 |
|
goto memerr; |
| 176 |
< |
source[nsn].sflags = nsflags; |
| 177 |
< |
VCOPY(source[nsn].sloc, nsloc); |
| 176 |
> |
source[i].sflags = nsflags; |
| 177 |
> |
VCOPY(source[i].sloc, nsloc); |
| 178 |
|
if (nsflags & SFLAT) |
| 179 |
< |
VCOPY(source[nsn].snorm, nsnorm); |
| 180 |
< |
source[nsn].ss = source[sn].ss; source[nsn].ss2 = source[sn].ss2; |
| 181 |
< |
if ((nsflags | source[sn].sflags) & SSPOT) { |
| 182 |
< |
if ((source[nsn].sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
| 183 |
< |
goto memerr; |
| 194 |
< |
if (nsflags & SSPOT) |
| 195 |
< |
copystruct(source[nsn].sl.s, &ourspot); |
| 196 |
< |
else |
| 197 |
< |
copystruct(source[nsn].sl.s, &theirspot); |
| 198 |
< |
source[nsn].sflags |= SSPOT; |
| 199 |
< |
} |
| 179 |
> |
VCOPY(source[i].snorm, nsnorm); |
| 180 |
> |
source[i].ss = source[sn].ss; source[i].ss2 = source[sn].ss2; |
| 181 |
> |
if ((source[i].sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
| 182 |
> |
goto memerr; |
| 183 |
> |
copystruct(source[i].sl.s, &ourspot); |
| 184 |
|
if (nsflags & SPROX) |
| 185 |
< |
source[nsn].sl.prox = source[sn].sl.prox; |
| 186 |
< |
source[nsn].sa.svnext = sn; |
| 187 |
< |
source[nsn].so = op; |
| 188 |
< |
return(nsn); |
| 185 |
> |
source[i].sl.prox = source[sn].sl.prox; |
| 186 |
> |
source[i].sa.svnext = sn; |
| 187 |
> |
source[i].so = op; |
| 188 |
> |
return(i); |
| 189 |
|
memerr: |
| 190 |
|
error(SYSTEM, "out of memory in makevsrc"); |
| 191 |
|
} |
| 192 |
|
|
| 193 |
|
|
| 194 |
< |
commonspot(sp1, sp2, org) /* set sp1 to intersection of sp1 and sp2 */ |
| 195 |
< |
register SPOT *sp1, *sp2; |
| 196 |
< |
FVECT org; |
| 194 |
> |
double |
| 195 |
> |
getdisk(oc, op, sn) /* get visible object disk */ |
| 196 |
> |
FVECT oc; |
| 197 |
> |
OBJREC *op; |
| 198 |
> |
register int sn; |
| 199 |
|
{ |
| 200 |
< |
FVECT cent; |
| 201 |
< |
double rad2, cos1, cos2; |
| 202 |
< |
|
| 203 |
< |
cos1 = 1. - sp1->siz/(2.*PI); |
| 204 |
< |
cos2 = 1. - sp2->siz/(2.*PI); |
| 205 |
< |
if (sp2->siz >= 2.*PI-FTINY) /* BIG, just check overlap */ |
| 206 |
< |
return(DOT(sp1->aim,sp2->aim) >= cos1*cos2 - |
| 207 |
< |
sqrt((1.-cos1*cos1)*(1.-cos2*cos2))); |
| 208 |
< |
/* compute and check disks */ |
| 209 |
< |
rad2 = intercircle(cent, sp1->aim, sp2->aim, |
| 210 |
< |
1./(cos1*cos1) - 1., 1./(cos2*cos2) - 1.); |
| 211 |
< |
if (rad2 <= FTINY || normalize(cent) == 0.) |
| 212 |
< |
return(0); |
| 213 |
< |
VCOPY(sp1->aim, cent); |
| 214 |
< |
sp1->siz = 2.*PI*(1. - 1./sqrt(1.+rad2)); |
| 215 |
< |
return(1); |
| 200 |
> |
double rad2, roffs, offs, d, rd, rdoto; |
| 201 |
> |
FVECT rnrm, nrm; |
| 202 |
> |
/* first, use object getdisk function */ |
| 203 |
> |
rad2 = (*sfun[op->otype].of->getdisk)(oc, op); |
| 204 |
> |
if (!(source[sn].sflags & SVIRTUAL)) |
| 205 |
> |
return(rad2); /* all done for normal source */ |
| 206 |
> |
/* check for correct side of relay surface */ |
| 207 |
> |
roffs = (*sfun[source[sn].so->otype].of->getpleq)(rnrm, source[sn].so); |
| 208 |
> |
rd = DOT(rnrm, source[sn].sloc); /* source projection */ |
| 209 |
> |
if (!(source[sn].sflags & SDISTANT)) |
| 210 |
> |
rd -= roffs; |
| 211 |
> |
d = DOT(rnrm, oc) - roffs; /* disk distance to relay plane */ |
| 212 |
> |
if ((d > 0.) ^ (rd > 0.)) |
| 213 |
> |
return(rad2); /* OK if opposite sides */ |
| 214 |
> |
if (d*d >= rad2) |
| 215 |
> |
return(.0); /* no relay is possible */ |
| 216 |
> |
/* we need a closer look */ |
| 217 |
> |
offs = (*sfun[op->otype].of->getpleq)(nrm, op); |
| 218 |
> |
rdoto = DOT(rnrm, nrm); |
| 219 |
> |
if (d*d >= rad2*(1.-rdoto*rdoto)) |
| 220 |
> |
return(0.); /* disk entirely on projection side */ |
| 221 |
> |
/* should shrink disk but I'm lazy */ |
| 222 |
> |
return(rad2); |
| 223 |
|
} |
| 224 |
|
|
| 225 |
|
|
| 226 |
< |
commonbeam(sp1, sp2, dir) /* set sp1 to intersection of sp1 and sp2 */ |
| 227 |
< |
register SPOT *sp1, *sp2; |
| 228 |
< |
FVECT dir; |
| 226 |
> |
int |
| 227 |
> |
vstestvis(f, o, oc, or2, sn) /* pretest source visibility */ |
| 228 |
> |
int f; /* virtual source flags */ |
| 229 |
> |
OBJREC *o; /* relay object */ |
| 230 |
> |
FVECT oc; /* relay object center */ |
| 231 |
> |
double or2; /* relay object radius squared */ |
| 232 |
> |
register int sn; /* target source number */ |
| 233 |
|
{ |
| 234 |
< |
FVECT cent, c1, c2; |
| 235 |
< |
double rad2, d; |
| 236 |
< |
register int i; |
| 237 |
< |
/* move centers to common plane */ |
| 238 |
< |
d = DOT(sp1->aim, dir); |
| 239 |
< |
for (i = 0; i < 3; i++) |
| 240 |
< |
c1[i] = sp1->aim[i] - d*dir[i]; |
| 241 |
< |
d = DOT(sp2->aim, dir); |
| 242 |
< |
for (i = 0; i < 3; i++) |
| 243 |
< |
c2[i] = sp2->aim[i] - d*dir[i]; |
| 244 |
< |
/* compute overlap */ |
| 245 |
< |
rad2 = intercircle(cent, c1, c2, sp1->siz/PI, sp2->siz/PI); |
| 246 |
< |
if (rad2 <= FTINY) |
| 247 |
< |
return(0); |
| 248 |
< |
VCOPY(sp1->aim, cent); |
| 249 |
< |
sp1->siz = PI*rad2; |
| 250 |
< |
return(1); |
| 251 |
< |
} |
| 252 |
< |
|
| 253 |
< |
|
| 254 |
< |
checkspot(sp, nrm) /* check spotlight for behind source */ |
| 255 |
< |
register SPOT *sp; |
| 256 |
< |
FVECT nrm; |
| 257 |
< |
{ |
| 258 |
< |
double d, d1; |
| 259 |
< |
|
| 260 |
< |
d = DOT(sp->aim, nrm); |
| 261 |
< |
if (d > FTINY) /* center in front? */ |
| 262 |
< |
return(0); |
| 263 |
< |
/* else check horizon */ |
| 264 |
< |
d1 = 1. - sp->siz/(2.*PI); |
| 265 |
< |
return(1.-FTINY-d*d > d1*d1); |
| 266 |
< |
} |
| 267 |
< |
|
| 268 |
< |
|
| 269 |
< |
double |
| 270 |
< |
intercircle(cc, c1, c2, r1s, r2s) /* intersect two circles */ |
| 271 |
< |
FVECT cc; /* midpoint (return value) */ |
| 272 |
< |
FVECT c1, c2; /* circle centers */ |
| 273 |
< |
double r1s, r2s; /* radii squared */ |
| 274 |
< |
{ |
| 275 |
< |
double a2, d2, l; |
| 276 |
< |
FVECT disp; |
| 277 |
< |
register int i; |
| 278 |
< |
|
| 279 |
< |
for (i = 0; i < 3; i++) |
| 283 |
< |
disp[i] = c2[i] - c1[i]; |
| 284 |
< |
d2 = DOT(disp,disp); |
| 285 |
< |
/* circle within overlap? */ |
| 286 |
< |
if (r1s < r2s) { |
| 287 |
< |
if (r2s >= r1s + d2) { |
| 288 |
< |
VCOPY(cc, c1); |
| 289 |
< |
return(r1s); |
| 290 |
< |
} |
| 291 |
< |
} else { |
| 292 |
< |
if (r1s >= r2s + d2) { |
| 293 |
< |
VCOPY(cc, c2); |
| 294 |
< |
return(r2s); |
| 295 |
< |
} |
| 234 |
> |
RAY sr; |
| 235 |
> |
FVECT onorm; |
| 236 |
> |
FVECT offsdir; |
| 237 |
> |
double or, d; |
| 238 |
> |
int nok, nhit; |
| 239 |
> |
register int i, n; |
| 240 |
> |
/* return if pretesting disabled */ |
| 241 |
> |
if (vspretest <= 0) |
| 242 |
> |
return(f); |
| 243 |
> |
/* get surface normal */ |
| 244 |
> |
(*sfun[o->otype].of->getpleq)(onorm, o); |
| 245 |
> |
/* set number of rays to sample */ |
| 246 |
> |
if (source[sn].sflags & SDISTANT) |
| 247 |
> |
n = (2./3.*PI*PI)*or2/(thescene.cusize*thescene.cusize)* |
| 248 |
> |
vspretest + .5; |
| 249 |
> |
else |
| 250 |
> |
n = or2/dist2(oc,source[sn].sloc)*vspretest + .5; |
| 251 |
> |
if (n < 1) n = 1; |
| 252 |
> |
/* limit tests to central region */ |
| 253 |
> |
or = DISKTFRAC*sqrt(or2); |
| 254 |
> |
/* sample */ |
| 255 |
> |
nhit = nok = 0; |
| 256 |
> |
while (n-- > 0) { |
| 257 |
> |
samplendx++; |
| 258 |
> |
/* |
| 259 |
> |
* We're being real sloppy with our sample locations here. |
| 260 |
> |
*/ |
| 261 |
> |
for (i = 0; i < 3; i++) |
| 262 |
> |
offsdir[i] = or*(1. - 2.*urand(931*i+5821+n)); |
| 263 |
> |
d = DOT(offsdir,onorm); |
| 264 |
> |
for (i = 0; i < 3; i++) |
| 265 |
> |
sr.rorg[i] = oc[i] + (1.-d)*offsdir[i]; |
| 266 |
> |
/* check against source */ |
| 267 |
> |
if (srcray(&sr, NULL, sn) == 0.0) |
| 268 |
> |
continue; |
| 269 |
> |
sr.revf = srcvalue; |
| 270 |
> |
rayvalue(&sr); |
| 271 |
> |
if (bright(sr.rcol) <= FTINY) |
| 272 |
> |
continue; |
| 273 |
> |
nok++; |
| 274 |
> |
/* check against obstructions */ |
| 275 |
> |
srcray(&sr, NULL, sn); |
| 276 |
> |
rayvalue(&sr); |
| 277 |
> |
if (bright(sr.rcol) <= FTINY) |
| 278 |
> |
continue; |
| 279 |
> |
nhit++; |
| 280 |
|
} |
| 281 |
< |
a2 = .25*(2.*(r1s+r2s) - d2 - (r2s-r1s)*(r2s-r1s)/d2); |
| 282 |
< |
/* no overlap? */ |
| 283 |
< |
if (a2 <= 0.) |
| 284 |
< |
return(0.); |
| 285 |
< |
/* overlap, compute center */ |
| 286 |
< |
l = sqrt((r1s - a2)/d2); |
| 303 |
< |
for (i = 0; i < 3; i++) |
| 304 |
< |
cc[i] = c1[i] + l*disp[i]; |
| 305 |
< |
return(a2); |
| 281 |
> |
/* interpret results */ |
| 282 |
> |
if (nhit == 0) |
| 283 |
> |
return(f | SSKIP); /* 0% hit rate: totally occluded */ |
| 284 |
> |
if (nhit == nok) |
| 285 |
> |
return(f & ~SFOLLOW); /* 100% hit rate: no occlusion */ |
| 286 |
> |
return(f); /* no comment */ |
| 287 |
|
} |
| 288 |
+ |
|
| 289 |
|
|
| 308 |
– |
|
| 290 |
|
#ifdef DEBUG |
| 291 |
< |
virtverb(vs, fp) /* print verbose description of virtual source */ |
| 292 |
< |
register SRCREC *vs; |
| 291 |
> |
virtverb(sn, fp) /* print verbose description of virtual source */ |
| 292 |
> |
register int sn; |
| 293 |
|
FILE *fp; |
| 294 |
|
{ |
| 295 |
|
register int i; |
| 296 |
|
|
| 297 |
|
fprintf(fp, "%s virtual source %d in %s %s\n", |
| 298 |
< |
vs->sflags & SDISTANT ? "distant" : "local", |
| 299 |
< |
vs-source, ofun[vs->so->otype].funame, vs->so->oname); |
| 298 |
> |
source[sn].sflags & SDISTANT ? "distant" : "local", |
| 299 |
> |
sn, ofun[source[sn].so->otype].funame, |
| 300 |
> |
source[sn].so->oname); |
| 301 |
|
fprintf(fp, "\tat (%f,%f,%f)\n", |
| 302 |
< |
vs->sloc[0], vs->sloc[1], vs->sloc[2]); |
| 302 |
> |
source[sn].sloc[0], source[sn].sloc[1], source[sn].sloc[2]); |
| 303 |
|
fprintf(fp, "\tlinked to source %d (%s)\n", |
| 304 |
< |
vs->sa.svnext, source[vs->sa.svnext].so->oname); |
| 305 |
< |
if (vs->sflags & SFOLLOW) |
| 304 |
> |
source[sn].sa.svnext, source[source[sn].sa.svnext].so->oname); |
| 305 |
> |
if (source[sn].sflags & SFOLLOW) |
| 306 |
|
fprintf(fp, "\talways followed\n"); |
| 307 |
|
else |
| 308 |
|
fprintf(fp, "\tnever followed\n"); |
| 309 |
< |
if (!(vs->sflags & SSPOT)) |
| 309 |
> |
if (!(source[sn].sflags & SSPOT)) |
| 310 |
|
return; |
| 311 |
|
fprintf(fp, "\twith spot aim (%f,%f,%f) and size %f\n", |
| 312 |
< |
vs->sl.s->aim[0], vs->sl.s->aim[1], vs->sl.s->aim[2], |
| 313 |
< |
vs->sl.s->siz); |
| 312 |
> |
source[sn].sl.s->aim[0], source[sn].sl.s->aim[1], |
| 313 |
> |
source[sn].sl.s->aim[2], source[sn].sl.s->siz); |
| 314 |
|
} |
| 315 |
|
#endif |
