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/* Copyright (c) 1995 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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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Support routines for source objects and materials |
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* |
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* External symbols declared in source.h |
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*/ |
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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 "face.h" |
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#define SRCINC 4 /* realloc increment for array */ |
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#define SRCINC 8 /* realloc increment for array */ |
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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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SRCFUNC sfun[NUMOTYPE]; /* source dispatch table */ |
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void |
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initstypes() /* initialize source dispatch table */ |
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{ |
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extern VSMATERIAL mirror_vs, direct1_vs, direct2_vs; |
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extern int fsetsrc(), ssetsrc(), sphsetsrc(), cylsetsrc(), rsetsrc(); |
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extern int nopart(), flatpart(), cylpart(); |
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extern double fgetplaneq(), rgetplaneq(); |
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extern double fgetmaxdisk(), rgetmaxdisk(); |
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static SOBJECT fsobj = {fsetsrc, flatpart, fgetplaneq, fgetmaxdisk}; |
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static SOBJECT ssobj = {ssetsrc, nopart}; |
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static SOBJECT sphsobj = {sphsetsrc, nopart}; |
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if (nsources == 0) |
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source = (SRCREC *)malloc(SRCINC*sizeof(SRCREC)); |
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else if (nsources%SRCINC == 0) |
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source = (SRCREC *)realloc((char *)source, |
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source = (SRCREC *)realloc((void *)source, |
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(unsigned)(nsources+SRCINC)*sizeof(SRCREC)); |
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if (source == NULL) |
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return(-1); |
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source[nsources].sflags = 0; |
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source[nsources].nhits = 1; |
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source[nsources].ntests = 2; /* initial hit probability = 1/2 */ |
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source[nsources].ntests = 2; /* initial hit probability = 50% */ |
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#if SHADCACHE |
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source[nsources].obscache = NULL; |
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#endif |
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return(nsources++); |
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} |
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void |
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setflatss(src) /* set sampling for a flat source */ |
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register SRCREC *src; |
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{ |
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} |
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void |
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fsetsrc(src, so) /* set a face as a source */ |
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register SRCREC *src; |
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OBJREC *so; |
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src->so = so; |
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/* get the face */ |
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f = getface(so); |
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if (f->area == 0.0) |
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objerror(so, USER, "zero source area"); |
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/* find the center */ |
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for (j = 0; j < 3; j++) { |
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src->sloc[j] = 0.0; |
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src->sloc[j] /= (double)f->nv; |
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} |
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if (!inface(src->sloc, f)) |
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objerror(so, USER, "cannot hit center"); |
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objerror(so, USER, "cannot hit source center"); |
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src->sflags |= SFLAT; |
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VCOPY(src->snorm, f->norm); |
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src->ss2 = f->area; |
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} |
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void |
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ssetsrc(src, so) /* set a source as a source */ |
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register SRCREC *src; |
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register OBJREC *so; |
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src->so = so; |
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if (so->oargs.nfargs != 4) |
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objerror(so, USER, "bad arguments"); |
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src->sflags |= SDISTANT; |
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src->sflags |= (SDISTANT|SCIR); |
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VCOPY(src->sloc, so->oargs.farg); |
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if (normalize(src->sloc) == 0.0) |
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objerror(so, USER, "zero direction"); |
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} |
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void |
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sphsetsrc(src, so) /* set a sphere as a source */ |
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register SRCREC *src; |
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register OBJREC *so; |
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if (so->oargs.nfargs != 4) |
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objerror(so, USER, "bad # arguments"); |
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if (so->oargs.farg[3] <= FTINY) |
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objerror(so, USER, "illegal radius"); |
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objerror(so, USER, "illegal source radius"); |
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src->sflags |= SCIR; |
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VCOPY(src->sloc, so->oargs.farg); |
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src->srad = so->oargs.farg[3]; |
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src->ss2 = PI * src->srad * src->srad; |
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for (i = 0; i < 3; i++) |
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src->ss[SU][i] = src->ss[SV][i] = src->ss[SW][i] = 0.0; |
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for (i = 0; i < 3; i++) |
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src->ss[i][i] = .7236 * so->oargs.farg[3]; |
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src->ss[i][i] = 0.7236 * so->oargs.farg[3]; |
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} |
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void |
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rsetsrc(src, so) /* set a ring (disk) as a source */ |
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register SRCREC *src; |
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OBJREC *so; |
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src->so = so; |
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/* get the ring */ |
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co = getcone(so, 0); |
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if (CO_R1(co) <= FTINY) |
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objerror(so, USER, "illegal source radius"); |
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VCOPY(src->sloc, CO_P0(co)); |
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if (CO_R0(co) > 0.0) |
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objerror(so, USER, "cannot hit center"); |
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src->sflags |= SFLAT; |
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objerror(so, USER, "cannot hit source center"); |
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src->sflags |= (SFLAT|SCIR); |
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VCOPY(src->snorm, co->ad); |
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src->srad = CO_R1(co); |
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src->ss2 = PI * src->srad * src->srad; |
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} |
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void |
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cylsetsrc(src, so) /* set a cylinder as a source */ |
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register SRCREC *src; |
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OBJREC *so; |
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src->so = so; |
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/* get the cylinder */ |
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co = getcone(so, 0); |
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if (CO_R0(co) <= FTINY) |
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objerror(so, USER, "illegal source radius"); |
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if (CO_R0(co) > .2*co->al) /* heuristic constraint */ |
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objerror(so, WARNING, "source aspect too small"); |
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src->sflags |= SCYL; |
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return(ns); |
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if ((ns = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
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return(NULL); |
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if (m->oargs.farg[3] <= FTINY) |
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objerror(m, USER, "zero angle"); |
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ns->siz = 2.0*PI * (1.0 - cos(PI/180.0/2.0 * m->oargs.farg[3])); |
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VCOPY(ns->aim, m->oargs.farg+4); |
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if ((ns->flen = normalize(ns->aim)) == 0.0) |
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} |
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int |
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spotout(r, s) /* check if we're outside spot region */ |
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register RAY *r; |
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register SPOT *s; |
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} |
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int |
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commonspot(sp1, sp2, org) /* set sp1 to intersection of sp1 and sp2 */ |
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register SPOT *sp1, *sp2; |
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FVECT org; |
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} |
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int |
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commonbeam(sp1, sp2, dir) /* set sp1 to intersection of sp1 and sp2 */ |
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register SPOT *sp1, *sp2; |
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FVECT dir; |
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FVECT cent, c1, c2; |
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double rad2, d; |
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register int i; |
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/* move centers to common plane */ |
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d = DOT(sp1->aim, dir); |
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for (i = 0; i < 3; i++) |
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c1[i] = sp1->aim[i] - d*dir[i]; |
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VSUM(c1, sp1->aim, dir, -d); |
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d = DOT(sp2->aim, dir); |
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for (i = 0; i < 3; i++) |
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c2[i] = sp2->aim[i] - d*dir[i]; |
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VSUM(c2, sp2->aim, dir, -d); |
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/* compute overlap */ |
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rad2 = intercircle(cent, c1, c2, sp1->siz/PI, sp2->siz/PI); |
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if (rad2 <= FTINY) |
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} |
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int |
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checkspot(sp, nrm) /* check spotlight for behind source */ |
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register SPOT *sp; /* spotlight */ |
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FVECT nrm; /* source surface normal */ |
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{ |
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FVECT onorm; |
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double offs, d, dist; |
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register int i; |
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offs = getplaneq(onorm, op); |
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d = -DOT(onorm, sp->aim); |
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dist = (DOT(pos, onorm) - offs)/d; |
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if (dist < 0.) |
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return(0.); |
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for (i = 0; i < 3; i++) |
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oc[i] = pos[i] + dist*sp->aim[i]; |
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VSUM(oc, pos, sp->aim, dist); |
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return(sp->siz*dist*dist/PI/(d*d)); |
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} |
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{ |
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FVECT onorm; |
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double offs, d, dist; |
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register int i; |
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offs = getplaneq(onorm, op); |
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d = -DOT(onorm, dir); |
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if (d >= -FTINY && d <= FTINY) |
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return(0.); |
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dist = (DOT(sp->aim, onorm) - offs)/d; |
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for (i = 0; i < 3; i++) |
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oc[i] = sp->aim[i] + dist*dir[i]; |
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VSUM(oc, sp->aim, dir, dist); |
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return(sp->siz/PI/(d*d)); |
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} |
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{ |
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double a2, d2, l; |
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FVECT disp; |
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register int i; |
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for (i = 0; i < 3; i++) |
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disp[i] = c2[i] - c1[i]; |
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VSUB(disp, c2, c1); |
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d2 = DOT(disp,disp); |
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/* circle within overlap? */ |
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if (r1s < r2s) { |
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return(0.); |
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/* overlap, compute center */ |
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l = sqrt((r1s - a2)/d2); |
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for (i = 0; i < 3; i++) |
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cc[i] = c1[i] + l*disp[i]; |
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VSUM(cc, c1, disp, l); |
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return(a2); |
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} |