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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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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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#include "ray.h" |
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#include "copyright.h" |
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#include "octree.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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double getdisk(); |
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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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markvirtuals() /* find and mark virtual sources */ |
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static int |
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isident4(MAT4 m) |
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{ |
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register OBJREC *o; |
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register int i; |
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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 (!FABSEQ(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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|
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|
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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 */ |
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if (directrelay <= 0) |
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return; |
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/* find virtual source objects */ |
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for (i = 0; i < nobjects; i++) { |
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for (i = 0; i < nsceneobjs; i++) { |
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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 (nvobjects == 0) |
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vobject = (OBJECT *)malloc(sizeof(OBJECT)); |
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else |
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vobject = (OBJECT *)realloc((char *)vobject, |
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vobject = (OBJECT *)realloc((void *)vobject, |
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(unsigned)(nvobjects+1)*sizeof(OBJECT)); |
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if (vobject == NULL) |
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error(SYSTEM, "out of memory in addvirtuals"); |
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for (i = nsources; i-- > 0; ) |
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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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free((void *)vobject); |
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nvobjects = 0; |
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} |
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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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void |
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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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} |
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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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void |
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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 = objptr(i); |
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m = findmaterial(o); |
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if (m == NULL) |
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return(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 = lastmod(objndx(m), m->oargs.sarg[0])) == OVOID) |
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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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else |
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nsflags &= ~SSPOT; |
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if (source[sn].sflags & SSPOT) { |
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copystruct(&theirspot, source[sn].sl.s); |
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theirspot = *(source[sn].sl.s); |
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multv3(theirspot.aim, source[sn].sl.s->aim, pm); |
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normalize(theirspot.aim); |
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if (nsflags & SSPOT) { |
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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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ourspot = theirspot; |
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d = 2.*ourspot.siz; |
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} |
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if (ourspot.siz < d-FTINY) { /* it shrunk */ |
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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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*(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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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 */ |
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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 */ |
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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; |
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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 { |
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for (i = 0; i < 3; i++) |
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offsdir[i] = source[sn].sloc[i] - oc[i]; |
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VSUB(offsdir, source[sn].sloc, oc); |
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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); |
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rayorigin(&sr, PRIMARY, NULL, NULL); |
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} while (!(*ofun[o->otype].funp)(o, &sr)); |
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/* check against source */ |
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VCOPY(sr.rorg, sr.rop); /* starting from intersection */ |
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} |
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sr.revf = srcvalue; |
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rayvalue(&sr); /* check sample validity */ |
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if (bright(sr.rcol) <= FTINY) |
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if ((d = scolor_mean(sr.rcol)) <= FTINY) |
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continue; |
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nok++; /* got sample; check obstructions */ |
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rayclear(&sr); |
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sr.revf = raytrace; |
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rayvalue(&sr); |
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if (bright(sr.rcol) > FTINY) |
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if ((d1 = scolor_mean(sr.rcol)) > FTINY) { |
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if (d - d1 > FTINY) { |
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> |
#ifdef DEBUG |
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> |
fprintf(stderr, "\tpartially shadowed\n"); |
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#endif |
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return(f); /* intervening transmitter */ |
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} |
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nhit++; |
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} |
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if (nhit > 0 && nhit < nok) { |
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#ifdef DEBUG |
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fprintf(stderr, "\tpartially occluded\n"); |
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#ifdef DEBUG |
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virtverb(sn, fp) /* print verbose description of virtual source */ |
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register int sn; |
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FILE *fp; |
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void |
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virtverb( /* print verbose description of virtual source */ |
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int sn, |
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FILE *fp |
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) |
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{ |
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register int i; |
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|
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fprintf(fp, "%s virtual source %d in %s %s\n", |
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source[sn].sflags & SDISTANT ? "distant" : "local", |
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sn, ofun[source[sn].so->otype].funame, |
