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/* Copyright (c) 1992 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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|
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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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} |
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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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|
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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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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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{ |
239 |
< |
register CONE *co; |
240 |
< |
register int i; |
239 |
> |
CONE *co; |
240 |
> |
int i; |
241 |
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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); |
246 |
+ |
if (co == NULL) |
247 |
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objerror(so, USER, "illegal source"); |
248 |
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if (CO_R0(co) <= FTINY) |
249 |
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objerror(so, USER, "illegal source radius"); |
250 |
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if (CO_R0(co) > .2*co->al) /* heuristic constraint */ |
251 |
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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++) |
225 |
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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; |
228 |
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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 * |
268 |
< |
makespot(m) /* make a spotlight */ |
269 |
< |
register OBJREC *m; |
268 |
> |
makespot( /* make a spotlight */ |
269 |
> |
OBJREC *m |
270 |
> |
) |
271 |
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{ |
272 |
< |
register SPOT *ns; |
272 |
> |
SPOT *ns; |
273 |
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|
274 |
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if ((ns = (SPOT *)m->os) != NULL) |
275 |
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return(ns); |
276 |
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if ((ns = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
277 |
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return(NULL); |
278 |
+ |
if (m->oargs.farg[3] <= FTINY) |
279 |
+ |
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])); |
281 |
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VCOPY(ns->aim, m->oargs.farg+4); |
282 |
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if ((ns->flen = normalize(ns->aim)) == 0.0) |
286 |
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} |
287 |
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288 |
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289 |
< |
spotout(r, s, dist) /* check if we're outside spot region */ |
290 |
< |
register RAY *r; |
291 |
< |
register SPOT *s; |
292 |
< |
int dist; |
289 |
> |
int |
290 |
> |
spotout( /* check if we're outside spot region */ |
291 |
> |
RAY *r, |
292 |
> |
SPOT *s |
293 |
> |
) |
294 |
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{ |
295 |
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double d; |
296 |
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FVECT vd; |
297 |
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|
298 |
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if (s == NULL) |
299 |
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return(0); |
300 |
< |
if (dist) { /* distant source */ |
300 |
> |
if (s->flen < -FTINY) { /* distant source */ |
301 |
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vd[0] = s->aim[0] - r->rorg[0]; |
302 |
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vd[1] = s->aim[1] - r->rorg[1]; |
303 |
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vd[2] = s->aim[2] - r->rorg[2]; |
318 |
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319 |
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320 |
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double |
321 |
< |
fgetmaxdisk(ocent, op) /* get center and squared radius of face */ |
322 |
< |
FVECT ocent; |
323 |
< |
OBJREC *op; |
321 |
> |
fgetmaxdisk( /* get center and squared radius of face */ |
322 |
> |
FVECT ocent, |
323 |
> |
OBJREC *op |
324 |
> |
) |
325 |
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{ |
326 |
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double maxrad2; |
327 |
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double d; |
328 |
< |
register int i, j; |
329 |
< |
register FACE *f; |
328 |
> |
int i, j; |
329 |
> |
FACE *f; |
330 |
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|
331 |
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f = getface(op); |
332 |
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if (f->area == 0.) |
351 |
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|
352 |
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|
353 |
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double |
354 |
< |
rgetmaxdisk(ocent, op) /* get center and squared radius of ring */ |
355 |
< |
FVECT ocent; |
356 |
< |
OBJREC *op; |
354 |
> |
rgetmaxdisk( /* get center and squared radius of ring */ |
355 |
> |
FVECT ocent, |
356 |
> |
OBJREC *op |
357 |
> |
) |
358 |
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{ |
359 |
< |
register CONE *co; |
359 |
> |
CONE *co; |
360 |
|
|
361 |
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co = getcone(op, 0); |
362 |
+ |
if (co == NULL) |
363 |
+ |
return(0.); |
364 |
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VCOPY(ocent, CO_P0(co)); |
365 |
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return(CO_R1(co)*CO_R1(co)); |
366 |
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} |
367 |
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|
368 |
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|
369 |
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double |
370 |
< |
fgetplaneq(nvec, op) /* get plane equation for face */ |
371 |
< |
FVECT nvec; |
372 |
< |
OBJREC *op; |
370 |
> |
fgetplaneq( /* get plane equation for face */ |
371 |
> |
FVECT nvec, |
372 |
> |
OBJREC *op |
373 |
> |
) |
374 |
|
{ |
375 |
< |
register FACE *fo; |
375 |
> |
FACE *fo; |
376 |
|
|
377 |
|
fo = getface(op); |
378 |
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VCOPY(nvec, fo->norm); |
381 |
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|
382 |
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|
383 |
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double |
384 |
< |
rgetplaneq(nvec, op) /* get plane equation for ring */ |
385 |
< |
FVECT nvec; |
386 |
< |
OBJREC *op; |
384 |
> |
rgetplaneq( /* get plane equation for ring */ |
385 |
> |
FVECT nvec, |
386 |
> |
OBJREC *op |
387 |
> |
) |
388 |
|
{ |
389 |
< |
register CONE *co; |
389 |
> |
CONE *co; |
390 |
|
|
391 |
|
co = getcone(op, 0); |
392 |
+ |
if (co == NULL) { |
393 |
+ |
memset(nvec, 0, sizeof(FVECT)); |
394 |
+ |
return(0.); |
395 |
+ |
} |
396 |
|
VCOPY(nvec, co->ad); |
397 |
|
return(DOT(nvec, CO_P0(co))); |
398 |
|
} |
399 |
|
|
400 |
|
|
401 |
< |
commonspot(sp1, sp2, org) /* set sp1 to intersection of sp1 and sp2 */ |
402 |
< |
register SPOT *sp1, *sp2; |
403 |
< |
FVECT org; |
401 |
> |
int |
402 |
> |
commonspot( /* set sp1 to intersection of sp1 and sp2 */ |
403 |
> |
SPOT *sp1, |
404 |
> |
SPOT *sp2, |
405 |
> |
FVECT org |
406 |
> |
) |
407 |
|
{ |
408 |
|
FVECT cent; |
409 |
|
double rad2, cos1, cos2; |
424 |
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} |
425 |
|
|
426 |
|
|
427 |
< |
commonbeam(sp1, sp2, dir) /* set sp1 to intersection of sp1 and sp2 */ |
428 |
< |
register SPOT *sp1, *sp2; |
429 |
< |
FVECT dir; |
427 |
> |
int |
428 |
> |
commonbeam( /* set sp1 to intersection of sp1 and sp2 */ |
429 |
> |
SPOT *sp1, |
430 |
> |
SPOT *sp2, |
431 |
> |
FVECT dir |
432 |
> |
) |
433 |
|
{ |
434 |
|
FVECT cent, c1, c2; |
435 |
|
double rad2, d; |
385 |
– |
register int i; |
436 |
|
/* move centers to common plane */ |
437 |
|
d = DOT(sp1->aim, dir); |
438 |
< |
for (i = 0; i < 3; i++) |
389 |
< |
c1[i] = sp1->aim[i] - d*dir[i]; |
438 |
> |
VSUM(c1, sp1->aim, dir, -d); |
439 |
|
d = DOT(sp2->aim, dir); |
440 |
< |
for (i = 0; i < 3; i++) |
392 |
< |
c2[i] = sp2->aim[i] - d*dir[i]; |
440 |
> |
VSUM(c2, sp2->aim, dir, -d); |
441 |
|
/* compute overlap */ |
442 |
|
rad2 = intercircle(cent, c1, c2, sp1->siz/PI, sp2->siz/PI); |
443 |
|
if (rad2 <= FTINY) |
448 |
|
} |
449 |
|
|
450 |
|
|
451 |
< |
checkspot(sp, nrm) /* check spotlight for behind source */ |
452 |
< |
register SPOT *sp; /* spotlight */ |
453 |
< |
FVECT nrm; /* source surface normal */ |
451 |
> |
int |
452 |
> |
checkspot( /* check spotlight for behind source */ |
453 |
> |
SPOT *sp, /* spotlight */ |
454 |
> |
FVECT nrm /* source surface normal */ |
455 |
> |
) |
456 |
|
{ |
457 |
|
double d, d1; |
458 |
|
|
466 |
|
|
467 |
|
|
468 |
|
double |
469 |
< |
spotdisk(oc, op, sp, pos) /* intersect spot with object op */ |
470 |
< |
FVECT oc; |
471 |
< |
OBJREC *op; |
472 |
< |
register SPOT *sp; |
473 |
< |
FVECT pos; |
469 |
> |
spotdisk( /* intersect spot with object op */ |
470 |
> |
FVECT oc, |
471 |
> |
OBJREC *op, |
472 |
> |
SPOT *sp, |
473 |
> |
FVECT pos |
474 |
> |
) |
475 |
|
{ |
476 |
|
FVECT onorm; |
477 |
|
double offs, d, dist; |
427 |
– |
register int i; |
478 |
|
|
479 |
|
offs = getplaneq(onorm, op); |
480 |
|
d = -DOT(onorm, sp->aim); |
483 |
|
dist = (DOT(pos, onorm) - offs)/d; |
484 |
|
if (dist < 0.) |
485 |
|
return(0.); |
486 |
< |
for (i = 0; i < 3; i++) |
437 |
< |
oc[i] = pos[i] + dist*sp->aim[i]; |
486 |
> |
VSUM(oc, pos, sp->aim, dist); |
487 |
|
return(sp->siz*dist*dist/PI/(d*d)); |
488 |
|
} |
489 |
|
|
490 |
|
|
491 |
|
double |
492 |
< |
beamdisk(oc, op, sp, dir) /* intersect beam with object op */ |
493 |
< |
FVECT oc; |
494 |
< |
OBJREC *op; |
495 |
< |
register SPOT *sp; |
496 |
< |
FVECT dir; |
492 |
> |
beamdisk( /* intersect beam with object op */ |
493 |
> |
FVECT oc, |
494 |
> |
OBJREC *op, |
495 |
> |
SPOT *sp, |
496 |
> |
FVECT dir |
497 |
> |
) |
498 |
|
{ |
499 |
|
FVECT onorm; |
500 |
|
double offs, d, dist; |
451 |
– |
register int i; |
501 |
|
|
502 |
|
offs = getplaneq(onorm, op); |
503 |
|
d = -DOT(onorm, dir); |
504 |
|
if (d >= -FTINY && d <= FTINY) |
505 |
|
return(0.); |
506 |
|
dist = (DOT(sp->aim, onorm) - offs)/d; |
507 |
< |
for (i = 0; i < 3; i++) |
459 |
< |
oc[i] = sp->aim[i] + dist*dir[i]; |
507 |
> |
VSUM(oc, sp->aim, dir, dist); |
508 |
|
return(sp->siz/PI/(d*d)); |
509 |
|
} |
510 |
|
|
511 |
|
|
512 |
|
double |
513 |
< |
intercircle(cc, c1, c2, r1s, r2s) /* intersect two circles */ |
514 |
< |
FVECT cc; /* midpoint (return value) */ |
515 |
< |
FVECT c1, c2; /* circle centers */ |
516 |
< |
double r1s, r2s; /* radii squared */ |
513 |
> |
intercircle( /* intersect two circles */ |
514 |
> |
FVECT cc, /* midpoint (return value) */ |
515 |
> |
FVECT c1, /* circle centers */ |
516 |
> |
FVECT c2, |
517 |
> |
double r1s, /* radii squared */ |
518 |
> |
double r2s |
519 |
> |
) |
520 |
|
{ |
521 |
|
double a2, d2, l; |
522 |
|
FVECT disp; |
472 |
– |
register int i; |
523 |
|
|
524 |
< |
for (i = 0; i < 3; i++) |
475 |
< |
disp[i] = c2[i] - c1[i]; |
524 |
> |
VSUB(disp, c2, c1); |
525 |
|
d2 = DOT(disp,disp); |
526 |
|
/* circle within overlap? */ |
527 |
|
if (r1s < r2s) { |
541 |
|
return(0.); |
542 |
|
/* overlap, compute center */ |
543 |
|
l = sqrt((r1s - a2)/d2); |
544 |
< |
for (i = 0; i < 3; i++) |
496 |
< |
cc[i] = c1[i] + l*disp[i]; |
544 |
> |
VSUM(cc, c1, disp, l); |
545 |
|
return(a2); |
498 |
– |
} |
499 |
– |
|
500 |
– |
|
501 |
– |
sourcehit(r) /* check to see if ray hit distant source */ |
502 |
– |
register RAY *r; |
503 |
– |
{ |
504 |
– |
int first, last; |
505 |
– |
register int i; |
506 |
– |
|
507 |
– |
if (r->rsrc >= 0) { /* check only one if aimed */ |
508 |
– |
first = last = r->rsrc; |
509 |
– |
} else { /* otherwise check all */ |
510 |
– |
first = 0; last = nsources-1; |
511 |
– |
} |
512 |
– |
for (i = first; i <= last; i++) |
513 |
– |
if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT) |
514 |
– |
/* |
515 |
– |
* Check to see if ray is within |
516 |
– |
* solid angle of source. |
517 |
– |
*/ |
518 |
– |
if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
519 |
– |
<= source[i].ss2) { |
520 |
– |
r->ro = source[i].so; |
521 |
– |
if (!(source[i].sflags & SSKIP)) |
522 |
– |
break; |
523 |
– |
} |
524 |
– |
|
525 |
– |
if (r->ro != NULL) { |
526 |
– |
for (i = 0; i < 3; i++) |
527 |
– |
r->ron[i] = -r->rdir[i]; |
528 |
– |
r->rod = 1.0; |
529 |
– |
r->rox = NULL; |
530 |
– |
return(1); |
531 |
– |
} |
532 |
– |
return(0); |
546 |
|
} |