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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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/* |
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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 32 /* 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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initstypes() /* initialize source dispatch table */ |
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void |
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initstypes(void) /* 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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int |
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newsource() /* allocate new source in our array */ |
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newsource(void) /* allocate new source in our array */ |
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{ |
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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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setflatss(src) /* set sampling for a flat source */ |
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register SRCREC *src; |
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void |
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setflatss( /* set sampling for a flat source */ |
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SRCREC *src |
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) |
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{ |
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double mult; |
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register int i; |
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int i; |
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src->ss[SV][0] = src->ss[SV][1] = src->ss[SV][2] = 0.0; |
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getperpendicular(src->ss[SU], src->snorm, rand_samp); |
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mult = .5 * sqrt( src->ss2 ); |
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for (i = 0; i < 3; i++) |
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if (src->snorm[i] < 0.6 && src->snorm[i] > -0.6) |
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break; |
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src->ss[SV][i] = 1.0; |
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fcross(src->ss[SU], src->ss[SV], src->snorm); |
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mult = .5 * sqrt( src->ss2 / DOT(src->ss[SU],src->ss[SU]) ); |
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for (i = 0; i < 3; i++) |
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src->ss[SU][i] *= mult; |
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fcross(src->ss[SV], src->snorm, src->ss[SU]); |
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} |
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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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void |
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fsetsrc( /* set a face as a source */ |
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SRCREC *src, |
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OBJREC *so |
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) |
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{ |
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register FACE *f; |
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register int i, j; |
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FACE *f; |
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int i, j; |
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double d; |
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src->sa.success = 2*AIMREQT-1; /* bitch on second failure */ |
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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.) |
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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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else |
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setflatss(src); |
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} else if (f->nv == 3) { /* triangle case */ |
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int near0 = 2; |
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double dmin = dist2line(src->sloc, VERTEX(f,2), VERTEX(f,0)); |
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for (i = 0; i < 2; i++) { |
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double d2 = dist2line(src->sloc, VERTEX(f,i), VERTEX(f,i+1)); |
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if (d2 >= dmin) |
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continue; |
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near0 = i; |
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dmin = d2; /* radius = min distance */ |
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} |
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if (dmin < .08*f->area) |
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objerror(so, WARNING, "triangular source with poor aspect"); |
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i = (near0 + 1) % 3; |
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for (j = 0; j < 3; j++) |
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src->ss[SU][j] = VERTEX(f,i)[j] - VERTEX(f,near0)[j]; |
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normalize(src->ss[SU]); |
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dmin = sqrt(dmin); |
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for (j = 0; j < 3; j++) |
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src->ss[SU][j] *= dmin; |
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fcross(src->ss[SV], f->norm, src->ss[SU]); |
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} else |
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setflatss(src); /* hope for convex! */ |
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} |
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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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void |
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ssetsrc( /* set a source as a source */ |
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SRCREC *src, |
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OBJREC *so |
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) |
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{ |
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double theta; |
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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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src->srad = sqrt(src->ss2/PI); |
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VCOPY(src->snorm, src->sloc); |
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setflatss(src); /* hey, whatever works */ |
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src->ss[SW][0] = src->ss[SW][1] = src->ss[SW][2] = 0.0; |
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} |
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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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void |
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sphsetsrc( /* set a sphere as a source */ |
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SRCREC *src, |
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OBJREC *so |
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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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src->sa.success = 2*AIMREQT-1; /* bitch on second failure */ |
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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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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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memset(src->ss, 0, sizeof(src->ss)); |
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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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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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void |
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rsetsrc( /* set a ring (disk) as a source */ |
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SRCREC *src, |
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OBJREC *so |
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) |
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{ |
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< |
register CONE *co; |
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> |
CONE *co; |
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src->sa.success = 2*AIMREQT-1; /* bitch on second failure */ |
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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 == NULL) |
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objerror(so, USER, "illegal source"); |
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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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|
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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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> |
void |
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> |
cylsetsrc( /* set a cylinder as a source */ |
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> |
SRCREC *src, |
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> |
OBJREC *so |
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> |
) |
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{ |
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< |
register CONE *co; |
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< |
register int i; |
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> |
CONE *co; |
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> |
int i; |
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|
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src->sa.success = 4*AIMREQT-1; /* bitch on fourth failure */ |
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src->so = so; |
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/* get the cylinder */ |
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co = getcone(so, 0); |
| 245 |
+ |
if (co == NULL) |
| 246 |
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objerror(so, USER, "illegal source"); |
| 247 |
+ |
if (CO_R0(co) <= FTINY) |
| 248 |
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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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/* set sampling vectors */ |
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for (i = 0; i < 3; i++) |
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src->ss[SU][i] = .5 * co->al * co->ad[i]; |
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< |
src->ss[SV][0] = src->ss[SV][1] = src->ss[SV][2] = 0.0; |
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> |
getperpendicular(src->ss[SW], co->ad, rand_samp); |
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for (i = 0; i < 3; i++) |
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if (co->ad[i] < 0.6 && co->ad[i] > -0.6) |
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break; |
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src->ss[SV][i] = 1.0; |
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fcross(src->ss[SW], src->ss[SV], co->ad); |
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normalize(src->ss[SW]); |
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for (i = 0; i < 3; i++) |
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src->ss[SW][i] *= .8559 * CO_R0(co); |
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fcross(src->ss[SV], src->ss[SW], co->ad); |
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} |
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SPOT * |
| 267 |
< |
makespot(m) /* make a spotlight */ |
| 268 |
< |
register OBJREC *m; |
| 267 |
> |
makespot( /* make a spotlight */ |
| 268 |
> |
OBJREC *m |
| 269 |
> |
) |
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{ |
| 271 |
< |
register SPOT *ns; |
| 271 |
> |
SPOT *ns; |
| 272 |
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|
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+ |
if ((ns = (SPOT *)m->os) != NULL) |
| 274 |
+ |
return(ns); |
| 275 |
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if ((ns = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
| 276 |
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return(NULL); |
| 277 |
+ |
if (m->oargs.farg[3] <= FTINY) |
| 278 |
+ |
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])); |
| 280 |
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VCOPY(ns->aim, m->oargs.farg+4); |
| 281 |
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if ((ns->flen = normalize(ns->aim)) == 0.0) |
| 282 |
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objerror(m, USER, "zero focus vector"); |
| 283 |
+ |
m->os = (char *)ns; |
| 284 |
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return(ns); |
| 285 |
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} |
| 286 |
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|
| 287 |
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|
| 288 |
+ |
int |
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+ |
spotout( /* check if we're outside spot region */ |
| 290 |
+ |
RAY *r, |
| 291 |
+ |
SPOT *s |
| 292 |
+ |
) |
| 293 |
+ |
{ |
| 294 |
+ |
double d; |
| 295 |
+ |
FVECT vd; |
| 296 |
+ |
|
| 297 |
+ |
if (s == NULL) |
| 298 |
+ |
return(0); |
| 299 |
+ |
if (s->flen < -FTINY) { /* distant source */ |
| 300 |
+ |
vd[0] = s->aim[0] - r->rorg[0]; |
| 301 |
+ |
vd[1] = s->aim[1] - r->rorg[1]; |
| 302 |
+ |
vd[2] = s->aim[2] - r->rorg[2]; |
| 303 |
+ |
d = DOT(r->rdir,vd); |
| 304 |
+ |
/* wrong side? |
| 305 |
+ |
if (d <= FTINY) |
| 306 |
+ |
return(1); */ |
| 307 |
+ |
d = DOT(vd,vd) - d*d; |
| 308 |
+ |
if (PI*d > s->siz) |
| 309 |
+ |
return(1); /* out */ |
| 310 |
+ |
return(0); /* OK */ |
| 311 |
+ |
} |
| 312 |
+ |
/* local source */ |
| 313 |
+ |
if (s->siz < 2.0*PI * (1.0 + DOT(s->aim,r->rdir))) |
| 314 |
+ |
return(1); /* out */ |
| 315 |
+ |
return(0); /* OK */ |
| 316 |
+ |
} |
| 317 |
+ |
|
| 318 |
+ |
|
| 319 |
|
double |
| 320 |
< |
fgetmaxdisk(ocent, op) /* get center and squared radius of face */ |
| 321 |
< |
FVECT ocent; |
| 322 |
< |
OBJREC *op; |
| 320 |
> |
fgetmaxdisk( /* get center and squared radius of face */ |
| 321 |
> |
FVECT ocent, |
| 322 |
> |
OBJREC *op |
| 323 |
> |
) |
| 324 |
|
{ |
| 325 |
|
double maxrad2; |
| 326 |
|
double d; |
| 327 |
< |
register int i, j; |
| 328 |
< |
register FACE *f; |
| 327 |
> |
int i, j; |
| 328 |
> |
FACE *f; |
| 329 |
|
|
| 330 |
|
f = getface(op); |
| 331 |
|
if (f->area == 0.) |
| 350 |
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|
| 351 |
|
|
| 352 |
|
double |
| 353 |
< |
rgetmaxdisk(ocent, op) /* get center and squared radius of ring */ |
| 354 |
< |
FVECT ocent; |
| 355 |
< |
OBJREC *op; |
| 353 |
> |
rgetmaxdisk( /* get center and squared radius of ring */ |
| 354 |
> |
FVECT ocent, |
| 355 |
> |
OBJREC *op |
| 356 |
> |
) |
| 357 |
|
{ |
| 358 |
< |
register CONE *co; |
| 358 |
> |
CONE *co; |
| 359 |
|
|
| 360 |
|
co = getcone(op, 0); |
| 361 |
+ |
if (co == NULL) |
| 362 |
+ |
return(0.); |
| 363 |
|
VCOPY(ocent, CO_P0(co)); |
| 364 |
|
return(CO_R1(co)*CO_R1(co)); |
| 365 |
|
} |
| 366 |
|
|
| 367 |
|
|
| 368 |
|
double |
| 369 |
< |
fgetplaneq(nvec, op) /* get plane equation for face */ |
| 370 |
< |
FVECT nvec; |
| 371 |
< |
OBJREC *op; |
| 369 |
> |
fgetplaneq( /* get plane equation for face */ |
| 370 |
> |
FVECT nvec, |
| 371 |
> |
OBJREC *op |
| 372 |
> |
) |
| 373 |
|
{ |
| 374 |
< |
register FACE *fo; |
| 374 |
> |
FACE *fo; |
| 375 |
|
|
| 376 |
|
fo = getface(op); |
| 377 |
|
VCOPY(nvec, fo->norm); |
| 380 |
|
|
| 381 |
|
|
| 382 |
|
double |
| 383 |
< |
rgetplaneq(nvec, op) /* get plane equation for ring */ |
| 384 |
< |
FVECT nvec; |
| 385 |
< |
OBJREC *op; |
| 383 |
> |
rgetplaneq( /* get plane equation for ring */ |
| 384 |
> |
FVECT nvec, |
| 385 |
> |
OBJREC *op |
| 386 |
> |
) |
| 387 |
|
{ |
| 388 |
< |
register CONE *co; |
| 388 |
> |
CONE *co; |
| 389 |
|
|
| 390 |
|
co = getcone(op, 0); |
| 391 |
+ |
if (co == NULL) { |
| 392 |
+ |
memset(nvec, 0, sizeof(FVECT)); |
| 393 |
+ |
return(0.); |
| 394 |
+ |
} |
| 395 |
|
VCOPY(nvec, co->ad); |
| 396 |
|
return(DOT(nvec, CO_P0(co))); |
| 397 |
|
} |
| 398 |
|
|
| 399 |
|
|
| 400 |
< |
commonspot(sp1, sp2, org) /* set sp1 to intersection of sp1 and sp2 */ |
| 401 |
< |
register SPOT *sp1, *sp2; |
| 402 |
< |
FVECT org; |
| 400 |
> |
int |
| 401 |
> |
commonspot( /* set sp1 to intersection of sp1 and sp2 */ |
| 402 |
> |
SPOT *sp1, |
| 403 |
> |
SPOT *sp2, |
| 404 |
> |
FVECT org |
| 405 |
> |
) |
| 406 |
|
{ |
| 407 |
|
FVECT cent; |
| 408 |
|
double rad2, cos1, cos2; |
| 423 |
|
} |
| 424 |
|
|
| 425 |
|
|
| 426 |
< |
commonbeam(sp1, sp2, dir) /* set sp1 to intersection of sp1 and sp2 */ |
| 427 |
< |
register SPOT *sp1, *sp2; |
| 428 |
< |
FVECT dir; |
| 426 |
> |
int |
| 427 |
> |
commonbeam( /* set sp1 to intersection of sp1 and sp2 */ |
| 428 |
> |
SPOT *sp1, |
| 429 |
> |
SPOT *sp2, |
| 430 |
> |
FVECT dir |
| 431 |
> |
) |
| 432 |
|
{ |
| 433 |
|
FVECT cent, c1, c2; |
| 434 |
|
double rad2, d; |
| 352 |
– |
register int i; |
| 435 |
|
/* move centers to common plane */ |
| 436 |
|
d = DOT(sp1->aim, dir); |
| 437 |
< |
for (i = 0; i < 3; i++) |
| 356 |
< |
c1[i] = sp1->aim[i] - d*dir[i]; |
| 437 |
> |
VSUM(c1, sp1->aim, dir, -d); |
| 438 |
|
d = DOT(sp2->aim, dir); |
| 439 |
< |
for (i = 0; i < 3; i++) |
| 359 |
< |
c2[i] = sp2->aim[i] - d*dir[i]; |
| 439 |
> |
VSUM(c2, sp2->aim, dir, -d); |
| 440 |
|
/* compute overlap */ |
| 441 |
|
rad2 = intercircle(cent, c1, c2, sp1->siz/PI, sp2->siz/PI); |
| 442 |
|
if (rad2 <= FTINY) |
| 447 |
|
} |
| 448 |
|
|
| 449 |
|
|
| 450 |
< |
checkspot(sp, nrm) /* check spotlight for behind source */ |
| 451 |
< |
register SPOT *sp; /* spotlight */ |
| 452 |
< |
FVECT nrm; /* source surface normal */ |
| 450 |
> |
int |
| 451 |
> |
checkspot( /* check spotlight for behind source */ |
| 452 |
> |
SPOT *sp, /* spotlight */ |
| 453 |
> |
FVECT nrm /* source surface normal */ |
| 454 |
> |
) |
| 455 |
|
{ |
| 456 |
|
double d, d1; |
| 457 |
|
|
| 465 |
|
|
| 466 |
|
|
| 467 |
|
double |
| 468 |
< |
spotdisk(oc, op, sp, pos) /* intersect spot with object op */ |
| 469 |
< |
FVECT oc; |
| 470 |
< |
OBJREC *op; |
| 471 |
< |
register SPOT *sp; |
| 472 |
< |
FVECT pos; |
| 468 |
> |
spotdisk( /* intersect spot with object op */ |
| 469 |
> |
FVECT oc, |
| 470 |
> |
OBJREC *op, |
| 471 |
> |
SPOT *sp, |
| 472 |
> |
FVECT pos |
| 473 |
> |
) |
| 474 |
|
{ |
| 475 |
|
FVECT onorm; |
| 476 |
|
double offs, d, dist; |
| 394 |
– |
register int i; |
| 477 |
|
|
| 478 |
|
offs = getplaneq(onorm, op); |
| 479 |
|
d = -DOT(onorm, sp->aim); |
| 482 |
|
dist = (DOT(pos, onorm) - offs)/d; |
| 483 |
|
if (dist < 0.) |
| 484 |
|
return(0.); |
| 485 |
< |
for (i = 0; i < 3; i++) |
| 404 |
< |
oc[i] = pos[i] + dist*sp->aim[i]; |
| 485 |
> |
VSUM(oc, pos, sp->aim, dist); |
| 486 |
|
return(sp->siz*dist*dist/PI/(d*d)); |
| 487 |
|
} |
| 488 |
|
|
| 489 |
|
|
| 490 |
|
double |
| 491 |
< |
beamdisk(oc, op, sp, dir) /* intersect beam with object op */ |
| 492 |
< |
FVECT oc; |
| 493 |
< |
OBJREC *op; |
| 494 |
< |
register SPOT *sp; |
| 495 |
< |
FVECT dir; |
| 491 |
> |
beamdisk( /* intersect beam with object op */ |
| 492 |
> |
FVECT oc, |
| 493 |
> |
OBJREC *op, |
| 494 |
> |
SPOT *sp, |
| 495 |
> |
FVECT dir |
| 496 |
> |
) |
| 497 |
|
{ |
| 498 |
|
FVECT onorm; |
| 499 |
|
double offs, d, dist; |
| 418 |
– |
register int i; |
| 500 |
|
|
| 501 |
|
offs = getplaneq(onorm, op); |
| 502 |
|
d = -DOT(onorm, dir); |
| 503 |
|
if (d >= -FTINY && d <= FTINY) |
| 504 |
|
return(0.); |
| 505 |
|
dist = (DOT(sp->aim, onorm) - offs)/d; |
| 506 |
< |
for (i = 0; i < 3; i++) |
| 426 |
< |
oc[i] = sp->aim[i] + dist*dir[i]; |
| 506 |
> |
VSUM(oc, sp->aim, dir, dist); |
| 507 |
|
return(sp->siz/PI/(d*d)); |
| 508 |
|
} |
| 509 |
|
|
| 510 |
|
|
| 511 |
|
double |
| 512 |
< |
intercircle(cc, c1, c2, r1s, r2s) /* intersect two circles */ |
| 513 |
< |
FVECT cc; /* midpoint (return value) */ |
| 514 |
< |
FVECT c1, c2; /* circle centers */ |
| 515 |
< |
double r1s, r2s; /* radii squared */ |
| 512 |
> |
intercircle( /* intersect two circles */ |
| 513 |
> |
FVECT cc, /* midpoint (return value) */ |
| 514 |
> |
FVECT c1, /* circle centers */ |
| 515 |
> |
FVECT c2, |
| 516 |
> |
double r1s, /* radii squared */ |
| 517 |
> |
double r2s |
| 518 |
> |
) |
| 519 |
|
{ |
| 520 |
|
double a2, d2, l; |
| 521 |
|
FVECT disp; |
| 439 |
– |
register int i; |
| 522 |
|
|
| 523 |
< |
for (i = 0; i < 3; i++) |
| 442 |
< |
disp[i] = c2[i] - c1[i]; |
| 523 |
> |
VSUB(disp, c2, c1); |
| 524 |
|
d2 = DOT(disp,disp); |
| 525 |
|
/* circle within overlap? */ |
| 526 |
|
if (r1s < r2s) { |
| 540 |
|
return(0.); |
| 541 |
|
/* overlap, compute center */ |
| 542 |
|
l = sqrt((r1s - a2)/d2); |
| 543 |
< |
for (i = 0; i < 3; i++) |
| 463 |
< |
cc[i] = c1[i] + l*disp[i]; |
| 543 |
> |
VSUM(cc, c1, disp, l); |
| 544 |
|
return(a2); |
| 465 |
– |
} |
| 466 |
– |
|
| 467 |
– |
|
| 468 |
– |
sourcehit(r) /* check to see if ray hit distant source */ |
| 469 |
– |
register RAY *r; |
| 470 |
– |
{ |
| 471 |
– |
int first, last; |
| 472 |
– |
register int i; |
| 473 |
– |
|
| 474 |
– |
if (r->rsrc >= 0) { /* check only one if aimed */ |
| 475 |
– |
first = last = r->rsrc; |
| 476 |
– |
} else { /* otherwise check all */ |
| 477 |
– |
first = 0; last = nsources-1; |
| 478 |
– |
} |
| 479 |
– |
for (i = first; i <= last; i++) |
| 480 |
– |
if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT) |
| 481 |
– |
/* |
| 482 |
– |
* Check to see if ray is within |
| 483 |
– |
* solid angle of source. |
| 484 |
– |
*/ |
| 485 |
– |
if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
| 486 |
– |
<= source[i].ss2) { |
| 487 |
– |
r->ro = source[i].so; |
| 488 |
– |
if (!(source[i].sflags & SSKIP)) |
| 489 |
– |
break; |
| 490 |
– |
} |
| 491 |
– |
|
| 492 |
– |
if (r->ro != NULL) { |
| 493 |
– |
for (i = 0; i < 3; i++) |
| 494 |
– |
r->ron[i] = -r->rdir[i]; |
| 495 |
– |
r->rod = 1.0; |
| 496 |
– |
r->rox = NULL; |
| 497 |
– |
return(1); |
| 498 |
– |
} |
| 499 |
– |
return(0); |
| 500 |
– |
} |
| 501 |
– |
|
| 502 |
– |
|
| 503 |
– |
/**************************************************************** |
| 504 |
– |
* The following macros were separated from the m_light() routine |
| 505 |
– |
* because they are very nasty and difficult to understand. |
| 506 |
– |
*/ |
| 507 |
– |
|
| 508 |
– |
/* wrongillum * |
| 509 |
– |
* |
| 510 |
– |
* We cannot allow an illum to pass to another illum, because that |
| 511 |
– |
* would almost certainly constitute overcounting. |
| 512 |
– |
* However, we do allow an illum to pass to another illum |
| 513 |
– |
* that is actually going to relay to a virtual light source. |
| 514 |
– |
*/ |
| 515 |
– |
|
| 516 |
– |
#define wrongillum(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
| 517 |
– |
objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM) |
| 518 |
– |
|
| 519 |
– |
/* wrongsource * |
| 520 |
– |
* |
| 521 |
– |
* This source is the wrong source (ie. overcounted) if we are |
| 522 |
– |
* aimed to a different source than the one we hit and the one |
| 523 |
– |
* we hit is not an illum which should be passed. |
| 524 |
– |
*/ |
| 525 |
– |
|
| 526 |
– |
#define wrongsource(m, r) (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \ |
| 527 |
– |
(m->otype!=MAT_ILLUM || wrongillum(m,r))) |
| 528 |
– |
|
| 529 |
– |
/* distglow * |
| 530 |
– |
* |
| 531 |
– |
* A distant glow is an object that sometimes acts as a light source, |
| 532 |
– |
* but is too far away from the test point to be one in this case. |
| 533 |
– |
*/ |
| 534 |
– |
|
| 535 |
– |
#define distglow(m, r) (m->otype==MAT_GLOW && \ |
| 536 |
– |
r->rot > m->oargs.farg[3]) |
| 537 |
– |
|
| 538 |
– |
/* badambient * |
| 539 |
– |
* |
| 540 |
– |
* We must avoid including counting light sources in the ambient calculation, |
| 541 |
– |
* since the direct component is handled separately. Therefore, any |
| 542 |
– |
* ambient ray which hits an active light source must be discarded. |
| 543 |
– |
*/ |
| 544 |
– |
|
| 545 |
– |
#define badambient(m, r) ((r->crtype&(AMBIENT|SHADOW))==AMBIENT && \ |
| 546 |
– |
!distglow(m, r)) |
| 547 |
– |
|
| 548 |
– |
/* passillum * |
| 549 |
– |
* |
| 550 |
– |
* An illum passes to another material type when we didn't hit it |
| 551 |
– |
* on purpose (as part of a direct calculation), or it is relaying |
| 552 |
– |
* a virtual light source. |
| 553 |
– |
*/ |
| 554 |
– |
|
| 555 |
– |
#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
| 556 |
– |
(r->rsrc<0 || source[r->rsrc].so!=r->ro || \ |
| 557 |
– |
source[r->rsrc].sflags&SVIRTUAL)) |
| 558 |
– |
|
| 559 |
– |
/* srcignore * |
| 560 |
– |
* |
| 561 |
– |
* The -di flag renders light sources invisible, and here is the test. |
| 562 |
– |
*/ |
| 563 |
– |
|
| 564 |
– |
#define srcignore(m, r) (directinvis && !(r->crtype&SHADOW) && \ |
| 565 |
– |
!distglow(m, r)) |
| 566 |
– |
|
| 567 |
– |
|
| 568 |
– |
m_light(m, r) /* ray hit a light source */ |
| 569 |
– |
register OBJREC *m; |
| 570 |
– |
register RAY *r; |
| 571 |
– |
{ |
| 572 |
– |
/* check for over-counting */ |
| 573 |
– |
if (wrongsource(m, r) || badambient(m, r)) |
| 574 |
– |
return; |
| 575 |
– |
/* check for passed illum */ |
| 576 |
– |
if (passillum(m, r)) { |
| 577 |
– |
if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
| 578 |
– |
raytrans(r); |
| 579 |
– |
else |
| 580 |
– |
rayshade(r, modifier(m->oargs.sarg[0])); |
| 581 |
– |
return; |
| 582 |
– |
} |
| 583 |
– |
/* otherwise treat as source */ |
| 584 |
– |
/* check for behind */ |
| 585 |
– |
if (r->rod < 0.0) |
| 586 |
– |
return; |
| 587 |
– |
/* check for invisibility */ |
| 588 |
– |
if (srcignore(m, r)) |
| 589 |
– |
return; |
| 590 |
– |
/* get distribution pattern */ |
| 591 |
– |
raytexture(r, m->omod); |
| 592 |
– |
/* get source color */ |
| 593 |
– |
setcolor(r->rcol, m->oargs.farg[0], |
| 594 |
– |
m->oargs.farg[1], |
| 595 |
– |
m->oargs.farg[2]); |
| 596 |
– |
/* modify value */ |
| 597 |
– |
multcolor(r->rcol, r->pcol); |
| 545 |
|
} |
