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#include "copyright.h" |
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#include "ray.h" |
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#include "otypes.h" |
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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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#define MINSAMPLES 16 /* minimum number of pretest samples */ |
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#define STESTMAX 32 /* maximum seeks per sample */ |
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#define FEQ(a,b) ((a)-(b)+FTINY >= 0 && (b)-(a)+FTINY >= 0) |
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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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static int |
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isident4(MAT4 m) |
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{ |
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int i, j; |
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|
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for (i = 4; i--; ) |
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for (j = 4; j--; ) |
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if (!FEQ(m[i][j], i==j)) |
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return(0); |
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return(1); |
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} |
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void |
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markvirtuals() /* find and mark virtual sources */ |
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markvirtuals(void) /* find and mark virtual sources */ |
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{ |
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register OBJREC *o; |
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register int i; |
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OBJREC *o; |
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int i; |
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/* check number of direct relays */ |
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if (directrelay <= 0) |
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return; |
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void |
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addvirtuals(sn, nr) /* add virtuals associated with source */ |
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int sn; |
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int nr; |
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addvirtuals( /* add virtuals associated with source */ |
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int sn, |
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int nr |
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) |
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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 */ |
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if (nr <= 0) |
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return; |
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void |
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vproject(o, sn, n) /* create projected source(s) if they exist */ |
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OBJREC *o; |
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int sn; |
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int n; |
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vproject( /* create projected source(s) if they exist */ |
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OBJREC *o, |
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int sn, |
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int n |
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) |
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{ |
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register int i; |
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register VSMATERIAL *vsmat; |
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int i; |
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VSMATERIAL *vsmat; |
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MAT4 proj; |
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int ns; |
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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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vsmaterial( /* get virtual source material pointer */ |
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OBJREC *o |
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) |
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{ |
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register int i; |
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register OBJREC *m; |
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int i; |
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OBJREC *m; |
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i = o->omod; |
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m = findmaterial(objptr(i)); |
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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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makevsrc( /* make virtual source if reasonable */ |
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OBJREC *op, |
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int sn, |
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MAT4 pm |
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) |
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{ |
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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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SPOT theirspot, ourspot; |
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register int i; |
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|
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> |
int i; |
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/* check for no-op */ |
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if (isident4(pm)) |
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return(0); |
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nsflags = source[sn].sflags | (SVIRTUAL|SSPOT|SFOLLOW); |
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/* get object center and max. radius */ |
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maxrad2 = getdisk(ocent, op, sn); |
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return(i); |
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memerr: |
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error(SYSTEM, "out of memory in makevsrc"); |
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return -1; /* pro forma return */ |
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} |
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double |
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getdisk(oc, op, sn) /* get visible object disk */ |
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FVECT oc; |
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OBJREC *op; |
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register int sn; |
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getdisk( /* get visible object disk */ |
| 283 |
> |
FVECT oc, |
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> |
OBJREC *op, |
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int sn |
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> |
) |
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{ |
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double rad2, roffs, offs, d, rd, rdoto; |
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FVECT rnrm, nrm; |
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int |
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vstestvis(f, o, oc, or2, sn) /* pretest source visibility */ |
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< |
int f; /* virtual source flags */ |
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< |
OBJREC *o; /* relay object */ |
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< |
FVECT oc; /* relay object center */ |
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< |
double or2; /* relay object radius squared */ |
| 320 |
< |
register int sn; /* target source number */ |
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> |
vstestvis( /* pretest source visibility */ |
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> |
int f, /* virtual source flags */ |
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> |
OBJREC *o, /* relay object */ |
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> |
FVECT oc, /* relay object center */ |
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> |
double or2, /* relay object radius squared */ |
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> |
int sn /* target source number */ |
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> |
) |
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{ |
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RAY sr; |
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FVECT onorm; |
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< |
FVECT offsdir; |
| 325 |
> |
double offsdir[3]; |
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SRCINDEX si; |
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< |
double or, d; |
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> |
double or, d, d1; |
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int stestlim, ssn; |
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int nhit, nok; |
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< |
register int i, n; |
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> |
int i, n; |
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/* return if pretesting disabled */ |
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if (vspretest <= 0) |
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return(f); |
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/* 32. == heuristic constant */ |
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n = 32.*or2/(thescene.cusize*thescene.cusize)*vspretest + .5; |
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} else { |
| 341 |
< |
for (i = 0; i < 3; i++) |
| 320 |
< |
offsdir[i] = source[sn].sloc[i] - oc[i]; |
| 341 |
> |
VSUB(offsdir, source[sn].sloc, oc); |
| 342 |
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d = DOT(offsdir,offsdir); |
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if (d <= FTINY) |
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n = 2.*PI * vspretest + .5; |
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sr.rdir[i] = -onorm[i]; |
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} |
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sr.rmax = 0.0; |
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< |
rayorigin(&sr, NULL, PRIMARY, 1.0); |
| 378 |
> |
rayorigin(&sr, PRIMARY, NULL, NULL); |
| 379 |
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} while (!(*ofun[o->otype].funp)(o, &sr)); |
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/* check against source */ |
| 381 |
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VCOPY(sr.rorg, sr.rop); /* starting from intersection */ |
| 389 |
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} |
| 390 |
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sr.revf = srcvalue; |
| 391 |
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rayvalue(&sr); /* check sample validity */ |
| 392 |
< |
if (bright(sr.rcol) <= FTINY) |
| 392 |
> |
if ((d = bright(sr.rcol)) <= FTINY) |
| 393 |
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continue; |
| 394 |
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nok++; /* got sample; check obstructions */ |
| 395 |
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rayclear(&sr); |
| 396 |
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sr.revf = raytrace; |
| 397 |
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rayvalue(&sr); |
| 398 |
< |
if (bright(sr.rcol) > FTINY) |
| 398 |
> |
if ((d1 = bright(sr.rcol)) > FTINY) { |
| 399 |
> |
if (d - d1 > FTINY) { |
| 400 |
> |
#ifdef DEBUG |
| 401 |
> |
fprintf(stderr, "\tpartially shadowed\n"); |
| 402 |
> |
#endif |
| 403 |
> |
return(f); /* intervening transmitter */ |
| 404 |
> |
} |
| 405 |
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nhit++; |
| 406 |
+ |
} |
| 407 |
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if (nhit > 0 && nhit < nok) { |
| 408 |
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#ifdef DEBUG |
| 409 |
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fprintf(stderr, "\tpartially occluded\n"); |
| 426 |
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|
| 427 |
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#ifdef DEBUG |
| 428 |
|
void |
| 429 |
< |
virtverb(sn, fp) /* print verbose description of virtual source */ |
| 430 |
< |
register int sn; |
| 431 |
< |
FILE *fp; |
| 429 |
> |
virtverb( /* print verbose description of virtual source */ |
| 430 |
> |
int sn, |
| 431 |
> |
FILE *fp |
| 432 |
> |
) |
| 433 |
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{ |
| 405 |
– |
register int i; |
| 406 |
– |
|
| 434 |
|
fprintf(fp, "%s virtual source %d in %s %s\n", |
| 435 |
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source[sn].sflags & SDISTANT ? "distant" : "local", |
| 436 |
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sn, ofun[source[sn].so->otype].funame, |
