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/* Copyright (c) 1986 Regents of the University of California */ |
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/* Copyright (c) 1990 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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SRCREC *source = NULL; /* our list of sources */ |
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int nsources = 0; /* the number of sources */ |
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static CONTRIB *srccnt; /* source contributions in direct() */ |
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static CNTPTR *cntord; /* source ordering in direct() */ |
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|
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marksources() /* find and mark source objects */ |
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{ |
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register OBJREC *o, *m; |
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|
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m = objptr(o->omod); |
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|
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if (m->otype != MAT_LIGHT && |
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m->otype != MAT_ILLUM && |
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m->otype != MAT_GLOW && |
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m->otype != MAT_SPOT) |
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if (!islight(m->otype)) |
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continue; |
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if (m->oargs.nfargs != (m->otype == MAT_GLOW ? 4 : |
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source = (SRCREC *)realloc((char *)source, |
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(unsigned)(nsources+1)*sizeof(SRCREC)); |
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if (source == NULL) |
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error(SYSTEM, "out of memory in marksources"); |
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goto memerr; |
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newsource(&source[nsources], o); |
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} |
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nsources++; |
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} |
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if (nsources <= 0) { |
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error(WARNING, "no light sources found"); |
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return; |
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} |
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srccnt = (CONTRIB *)malloc(nsources*sizeof(CONTRIB)); |
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cntord = (CNTPTR *)malloc(nsources*sizeof(CNTPTR)); |
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if (srccnt != NULL && cntord != NULL) |
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return; |
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/* fall through */ |
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memerr: |
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error(SYSTEM, "out of memory in marksources"); |
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} |
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register int i; |
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src->sflags = 0; |
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src->aimsuccess = 2*AIMREQT-1; /* bitch on second failure */ |
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src->nhits = 1; src->ntests = 2; /* start probability = 1/2 */ |
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src->so = so; |
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} |
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if (dstrsrc > FTINY) { |
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/* distribute source direction */ |
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for (i = 0; i < 3; i++) |
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vd[i] = dstrsrc * source[sn].ss * (1.0 - 2.0*frandom()); |
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|
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dimlist[ndims++] = sn; |
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for (i = 0; i < 3; i++) { |
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dimlist[ndims] = i + 8831; |
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vd[i] = dstrsrc * source[sn].ss * |
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(1.0 - 2.0*urand(ilhash(dimlist,ndims+1)+samplendx)); |
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} |
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ndims--; |
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if (norm != NULL) { /* project offset */ |
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d = DOT(vd, norm); |
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for (i = 0; i < 3; i++) |
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/* domega constant */ |
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return(source[sn].ss2); |
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else { |
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/* check proximity */ |
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if (source[sn].sflags & SPROX && |
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d > source[sn].sl.prox) |
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return(0.0); |
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|
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if (norm != NULL) |
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ddot /= d; |
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else |
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ddot = 1.0; |
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if (source[sn].sflags & SPROX && |
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d > source[sn].sl.prox) |
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return(0.0); |
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/* compute dot product */ |
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if (norm != NULL) |
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ddot /= d; |
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else |
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ddot = 1.0; |
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/* check angle */ |
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if (source[sn].sflags & SSPOT) { |
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if (source[sn].sl.s->siz < 2.0*PI * |
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if (source[sn].sflags & SSPOT) { |
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if (source[sn].sl.s->siz < 2.0*PI * |
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(1.0 + DOT(source[sn].sl.s->aim,sr->rdir))) |
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return(0.0); |
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d += source[sn].sl.s->flen; |
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} |
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/* return domega */ |
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return(ddot*source[sn].ss2/(d*d)); |
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return(0.0); |
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d += source[sn].sl.s->flen; /* adjust length */ |
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} |
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/* compute domega */ |
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return(ddot*source[sn].ss2/(d*d)); |
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} |
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for (i = 0; i < 3; i++) |
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r->ron[i] = -r->rdir[i]; |
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r->rod = 1.0; |
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r->rofs = 1.0; setident4(r->rofx); |
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r->robs = 1.0; setident4(r->robx); |
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r->rox = NULL; |
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return(1); |
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} |
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return(0); |
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{ |
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extern double pow(); |
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register int sn; |
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register CONTRIB *srccnt; |
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register CNTPTR *cntord; |
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int nshadcheck, ncnts; |
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double prob, ourthresh, hwt, test2, hit2; |
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int nhits; |
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double prob, ourthresh, hwt; |
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RAY sr; |
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|
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/* NOTE: srccnt and cntord global so no recursion */ |
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if (nsources <= 0) |
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return; |
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srccnt = (CONTRIB *)malloc(nsources*sizeof(CONTRIB)); |
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cntord = (CNTPTR *)malloc(nsources*sizeof(CNTPTR)); |
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if (srccnt == NULL || cntord == NULL) |
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error(SYSTEM, "out of memory in direct"); |
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return; /* no sources?! */ |
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/* compute number to check */ |
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nshadcheck = pow((double)nsources, shadcert) + .5; |
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/* modify threshold */ |
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if (cntord[sn].brt <= 0.0) |
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continue; |
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/* compute intersection */ |
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if (!( source[sn].sflags & SDISTANT ? |
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if (source[sn].sflags & SDISTANT ? |
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sourcehit(&sr) : |
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(*ofun[source[sn].so->otype].funp) |
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(source[sn].so, &sr) )) |
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(source[sn].so, &sr)) { |
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if (source[sn].aimsuccess >= 0) |
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source[sn].aimsuccess++; |
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} else { |
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cntord[sn].brt = 0.0; |
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if (source[sn].aimsuccess < 0) |
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continue; /* bitched already */ |
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source[sn].aimsuccess -= AIMREQT; |
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if (source[sn].aimsuccess >= 0) |
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continue; /* leniency */ |
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sprintf(errmsg, |
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"aiming failure for light source \"%s\"", |
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source[sn].so->oname); |
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error(WARNING, errmsg); |
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continue; |
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} |
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/* compute contribution */ |
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raycont(&sr); |
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multcolor(srccnt[sn].val, sr.rcol); |
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/* accumulate tail */ |
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for (sn = ncnts-1; sn > 0; sn--) |
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cntord[sn-1].brt += cntord[sn].brt; |
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/* start with prob=.5 */ |
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hit2 = 0.5; test2 = 1.0; |
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/* test for shadows */ |
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nhits = 0; |
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for (sn = 0; sn < ncnts; sn++) { |
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/* check threshold */ |
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if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
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cntord[sn].brt-cntord[sn+nshadcheck].brt) < |
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ourthresh*bright(r->rcol)) |
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cntord[sn].brt-cntord[sn+nshadcheck].brt) |
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< ourthresh*bright(r->rcol)) |
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break; |
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/* get statistics */ |
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hwt = (double)source[cntord[sn].sno].nhits / |
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(double)source[cntord[sn].sno].ntests; |
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test2 += hwt; |
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source[cntord[sn].sno].ntests++; |
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/* test for hit */ |
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rayorigin(&sr, r, SHADOW, 1.0); |
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} |
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/* add contribution if hit */ |
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addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
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hit2 += hwt; |
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nhits++; |
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source[cntord[sn].sno].nhits++; |
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} |
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/* weighted hit rate */ |
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hwt = hit2 / test2; |
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/* surface hit rate */ |
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if (sn > 0) |
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hwt = (double)nhits / (double)sn; |
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else |
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hwt = 0.5; |
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#ifdef DEBUG |
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sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
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sn, ncnts-sn, hwt); |
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scalecolor(srccnt[cntord[sn].sno].val, prob); |
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addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
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} |
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free(srccnt); |
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free(cntord); |
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} |
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m->oargs.farg[2]); |
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/* modify value */ |
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multcolor(r->rcol, r->pcol); |
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/* assign distance */ |
459 |
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r->rt = r->rot; |
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} |
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} |
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|
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|
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o_source() {} /* intersection with a source is done elsewhere */ |