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/* Copyright (c) 1991 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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src->srad = sqrt(src->srad); |
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/* compute size vectors */ |
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if (f->nv == 4 || (f->nv == 5 && /* parallelogram case */ |
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dist2(VERTEX(f,0),VERTEX(f,4)) <= FTINY*FTINY)) |
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if (f->nv == 4) /* parallelogram case */ |
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for (j = 0; j < 3; j++) { |
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src->ss[SU][j] = .5*(VERTEX(f,1)[j]-VERTEX(f,0)[j]); |
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src->ss[SV][j] = .5*(VERTEX(f,3)[j]-VERTEX(f,0)[j]); |
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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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} |
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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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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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} |
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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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objerror(so, USER, "cannot hit source center"); |
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src->sflags |= SFLAT; |
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VCOPY(src->snorm, co->ad); |
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src->srad = CO_R1(co); |
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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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{ |
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register SPOT *ns; |
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if ((ns = (SPOT *)m->os) != NULL) |
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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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objerror(m, USER, "zero focus vector"); |
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m->os = (char *)ns; |
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return(ns); |
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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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double d; |
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FVECT vd; |
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if (s == NULL) |
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return(0); |
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if (s->flen < -FTINY) { /* distant source */ |
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vd[0] = s->aim[0] - r->rorg[0]; |
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vd[1] = s->aim[1] - r->rorg[1]; |
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vd[2] = s->aim[2] - r->rorg[2]; |
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d = DOT(r->rdir,vd); |
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/* wrong side? |
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if (d <= FTINY) |
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return(1); */ |
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d = DOT(vd,vd) - d*d; |
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if (PI*d > s->siz) |
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return(1); /* out */ |
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return(0); /* OK */ |
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} |
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/* local source */ |
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if (s->siz < 2.0*PI * (1.0 + DOT(s->aim,r->rdir))) |
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return(1); /* out */ |
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return(0); /* OK */ |
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} |
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double |
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fgetmaxdisk(ocent, op) /* get center and squared radius of face */ |
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FVECT ocent; |
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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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} |
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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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for (i = 0; i < 3; i++) |
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cc[i] = c1[i] + l*disp[i]; |
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return(a2); |
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} |
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sourcehit(r) /* check to see if ray hit distant source */ |
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register RAY *r; |
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{ |
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int first, last; |
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register int i; |
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if (r->rsrc >= 0) { /* check only one if aimed */ |
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first = last = r->rsrc; |
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} else { /* otherwise check all */ |
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first = 0; last = nsources-1; |
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} |
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for (i = first; i <= last; i++) |
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if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT) |
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/* |
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* Check to see if ray is within |
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* solid angle of source. |
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*/ |
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if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
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<= source[i].ss2) { |
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r->ro = source[i].so; |
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if (!(source[i].sflags & SSKIP)) |
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break; |
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} |
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|
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if (r->ro != NULL) { |
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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->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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#define wrongsource(m, r) (r->rsrc>=0 && \ |
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source[r->rsrc].so!=r->ro && \ |
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(m->otype!=MAT_ILLUM || \ |
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objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM)) |
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|
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#define distglow(m, r) (m->otype==MAT_GLOW && \ |
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r->rot > m->oargs.farg[3]) |
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#define badambient(m, r) ((r->crtype&(AMBIENT|SHADOW))==AMBIENT && \ |
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!distglow(m, r)) |
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#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
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!(r->rsrc>=0&&source[r->rsrc].so==r->ro)) |
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#define srcignore(m, r) (directinvis && !(r->crtype&SHADOW) && \ |
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!distglow(m, r)) |
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|
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m_light(m, r) /* ray hit a light source */ |
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register OBJREC *m; |
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register RAY *r; |
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{ |
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/* check for over-counting */ |
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if (wrongsource(m, r) || badambient(m, r)) |
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return; |
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/* check for passed illum */ |
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if (passillum(m, r)) { |
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if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
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raytrans(r); |
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else |
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rayshade(r, modifier(m->oargs.sarg[0])); |
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return; |
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} |
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/* otherwise treat as source */ |
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/* check for behind */ |
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if (r->rod < 0.0) |
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return; |
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/* check for invisibility */ |
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if (srcignore(m, r)) |
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return; |
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/* get distribution pattern */ |
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raytexture(r, m->omod); |
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/* get source color */ |
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setcolor(r->rcol, m->oargs.farg[0], |
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m->oargs.farg[1], |
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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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} |