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root/radiance/ray/src/rt/srcsupp.c
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Comparing ray/src/rt/srcsupp.c (file contents):
Revision 1.11 by greg, Wed Aug 14 08:19:20 1991 UTC vs.
Revision 2.1 by greg, Tue Nov 12 17:10:22 1991 UTC

# Line 18 | Line 18 | static char SCCSid[] = "$SunId$ LBL";
18  
19   #include  "face.h"
20  
21 + #define SRCINC          4               /* realloc increment for array */
22  
23   SRCREC  *source = NULL;                 /* our list of sources */
24   int  nsources = 0;                      /* the number of sources */
# Line 28 | Line 29 | SRCFUNC  sfun[NUMOTYPE];               /* source dispatch table */
29   initstypes()                    /* initialize source dispatch table */
30   {
31          extern VSMATERIAL  mirror_vs, direct1_vs, direct2_vs;
32 <        extern int  fsetsrc(), ssetsrc(), sphsetsrc(), rsetsrc();
32 >        extern int  fsetsrc(), ssetsrc(), sphsetsrc(), cylsetsrc(), rsetsrc();
33 >        extern int  nopart(), flatpart(), cylpart();
34          extern double  fgetplaneq(), rgetplaneq();
35          extern double  fgetmaxdisk(), rgetmaxdisk();
36 <        static SOBJECT  fsobj = {fsetsrc, fgetplaneq, fgetmaxdisk};
37 <        static SOBJECT  ssobj = {ssetsrc};
38 <        static SOBJECT  sphsobj = {sphsetsrc};
39 <        static SOBJECT  rsobj = {rsetsrc, rgetplaneq, rgetmaxdisk};
36 >        static SOBJECT  fsobj = {fsetsrc, flatpart, fgetplaneq, fgetmaxdisk};
37 >        static SOBJECT  ssobj = {ssetsrc, nopart};
38 >        static SOBJECT  sphsobj = {sphsetsrc, nopart};
39 >        static SOBJECT  cylsobj = {cylsetsrc, cylpart};
40 >        static SOBJECT  rsobj = {rsetsrc, flatpart, rgetplaneq, rgetmaxdisk};
41  
42          sfun[MAT_MIRROR].mf = &mirror_vs;
43          sfun[MAT_DIRECT1].mf = &direct1_vs;
# Line 42 | Line 45 | initstypes()                   /* initialize source dispatch table */
45          sfun[OBJ_FACE].of = &fsobj;
46          sfun[OBJ_SOURCE].of = &ssobj;
47          sfun[OBJ_SPHERE].of = &sphsobj;
48 +        sfun[OBJ_CYLINDER].of = &cylsobj;
49          sfun[OBJ_RING].of = &rsobj;
50   }
51  
# Line 50 | Line 54 | int
54   newsource()                     /* allocate new source in our array */
55   {
56          if (nsources == 0)
57 <                source = (SRCREC *)malloc(sizeof(SRCREC));
58 <        else
57 >                source = (SRCREC *)malloc(SRCINC*sizeof(SRCREC));
58 >        else if (nsources%SRCINC == 0)
59                  source = (SRCREC *)realloc((char *)source,
60 <                                (unsigned)(nsources+1)*sizeof(SRCREC));
60 >                                (unsigned)(nsources+SRCINC)*sizeof(SRCREC));
61          if (source == NULL)
62                  return(-1);
63          source[nsources].sflags = 0;
# Line 63 | Line 67 | newsource()                    /* allocate new source in our array */
67   }
68  
69  
70 + setflatss(src)                          /* set sampling for a flat source */
71 + register SRCREC  *src;
72 + {
73 +        double  mult;
74 +        register int  i;
75 +
76 +        src->ss[SV][0] = src->ss[SV][1] = src->ss[SV][2] = 0.0;
77 +        for (i = 0; i < 3; i++)
78 +                if (src->snorm[i] < 0.6 && src->snorm[i] > -0.6)
79 +                        break;
80 +        src->ss[SV][i] = 1.0;
81 +        fcross(src->ss[SU], src->ss[SV], src->snorm);
82 +        mult = .5 * sqrt( src->ss2 / DOT(src->ss[SU],src->ss[SU]) );
83 +        for (i = 0; i < 3; i++)
84 +                src->ss[SU][i] *= mult;
85 +        fcross(src->ss[SV], src->snorm, src->ss[SU]);
86 + }
87 +
88 +
89   fsetsrc(src, so)                        /* set a face as a source */
90   register SRCREC  *src;
91   OBJREC  *so;
92   {
93          register FACE  *f;
94          register int  i, j;
95 +        double  d;
96          
97          src->sa.success = 2*AIMREQT-1;          /* bitch on second failure */
98          src->so = so;
# Line 85 | Line 109 | OBJREC  *so;
109                  objerror(so, USER, "cannot hit center");
110          src->sflags |= SFLAT;
111          VCOPY(src->snorm, f->norm);
88 –        src->ss = sqrt(f->area / PI);
112          src->ss2 = f->area;
113 +                                                /* find maximum radius */
114 +        src->srad = 0.;
115 +        for (i = 0; i < f->nv; i++) {
116 +                d = dist2(VERTEX(f,i), src->sloc);
117 +                if (d > src->srad)
118 +                        src->srad = d;
119 +        }
120 +        src->srad = sqrt(src->srad);
121 +                                                /* compute size vectors */
122 +        if (f->nv == 4 || (f->nv == 5 &&        /* parallelogram case */
123 +                        dist2(VERTEX(f,0),VERTEX(f,4)) <= FTINY*FTINY))
124 +                for (j = 0; j < 3; j++) {
125 +                        src->ss[SU][j] = .5*(VERTEX(f,1)[j]-VERTEX(f,0)[j]);
126 +                        src->ss[SV][j] = .5*(VERTEX(f,3)[j]-VERTEX(f,0)[j]);
127 +                }
128 +        else
129 +                setflatss(src);
130   }
131  
132  
# Line 107 | Line 147 | register OBJREC  *so;
147          theta = PI/180.0/2.0 * so->oargs.farg[3];
148          if (theta <= FTINY)
149                  objerror(so, USER, "zero size");
110 –        src->ss = theta >= PI/4.0 ? 1.0 : tan(theta);
150          src->ss2 = 2.0*PI * (1.0 - cos(theta));
151 +                                        /* the following is approximate */
152 +        src->srad = sqrt(src->ss2/PI);
153 +        VCOPY(src->snorm, src->sloc);
154 +        setflatss(src);                 /* hey, whatever works */
155 +        src->ss[SW][0] = src->ss[SW][1] = src->ss[SW][2] = 0.0;
156   }
157  
158  
# Line 116 | Line 160 | sphsetsrc(src, so)                     /* set a sphere as a source */
160   register SRCREC  *src;
161   register OBJREC  *so;
162   {
163 +        register int  i;
164 +
165          src->sa.success = 2*AIMREQT-1;          /* bitch on second failure */
166          src->so = so;
167          if (so->oargs.nfargs != 4)
# Line 123 | Line 169 | register OBJREC  *so;
169          if (so->oargs.farg[3] <= FTINY)
170                  objerror(so, USER, "illegal radius");
171          VCOPY(src->sloc, so->oargs.farg);
172 <        src->ss = so->oargs.farg[3];
173 <        src->ss2 = PI * src->ss * src->ss;
172 >        src->srad = so->oargs.farg[3];
173 >        src->ss2 = PI * src->srad * src->srad;
174 >        for (i = 0; i < 3; i++)
175 >                src->ss[SU][i] = src->ss[SV][i] = src->ss[SW][i] = 0.0;
176 >        for (i = 0; i < 3; i++)
177 >                src->ss[i][i] = .7236 * so->oargs.farg[3];
178   }
179  
180  
# Line 143 | Line 193 | OBJREC  *so;
193                  objerror(so, USER, "cannot hit center");
194          src->sflags |= SFLAT;
195          VCOPY(src->snorm, co->ad);
196 <        src->ss = CO_R1(co);
197 <        src->ss2 = PI * src->ss * src->ss;
196 >        src->srad = CO_R1(co);
197 >        src->ss2 = PI * src->srad * src->srad;
198 >        setflatss(src);
199   }
200  
201  
202 + cylsetsrc(src, so)                      /* set a cylinder as a source */
203 + register SRCREC  *src;
204 + OBJREC  *so;
205 + {
206 +        register CONE  *co;
207 +        register int  i;
208 +        
209 +        src->sa.success = 4*AIMREQT-1;          /* bitch on fourth failure */
210 +        src->so = so;
211 +                                                /* get the cylinder */
212 +        co = getcone(so, 0);
213 +        if (CO_R0(co) > .2*co->al)              /* heuristic constraint */
214 +                objerror(so, WARNING, "source aspect too small");
215 +        src->sflags |= SCYL;
216 +        for (i = 0; i < 3; i++)
217 +                src->sloc[i] = .5 * (CO_P1(co)[i] + CO_P0(co)[i]);
218 +        src->srad = .5*co->al;
219 +        src->ss2 = 2.*CO_R0(co)*co->al;
220 +                                                /* set sampling vectors */
221 +        for (i = 0; i < 3; i++)
222 +                src->ss[SU][i] = .5 * co->al * co->ad[i];
223 +        src->ss[SV][0] = src->ss[SV][1] = src->ss[SV][2] = 0.0;
224 +        for (i = 0; i < 3; i++)
225 +                if (co->ad[i] < 0.6 && co->ad[i] > -0.6)
226 +                        break;
227 +        src->ss[SV][i] = 1.0;
228 +        fcross(src->ss[SW], src->ss[SV], co->ad);
229 +        normalize(src->ss[SW]);
230 +        for (i = 0; i < 3; i++)
231 +                src->ss[SW][i] *= .8559 * CO_R0(co);
232 +        fcross(src->ss[SV], src->ss[SW], co->ad);
233 + }
234 +
235 +
236   SPOT *
237   makespot(m)                     /* make a spotlight */
238   register OBJREC  *m;
# Line 392 | Line 477 | register RAY  *r;
477                  first = 0; last = nsources-1;
478          }
479          for (i = first; i <= last; i++)
480 <                if (source[i].sflags & SDISTANT)
480 >                if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT)
481                          /*
482                           * Check to see if ray is within
483                           * solid angle of source.
# Line 415 | Line 500 | register RAY  *r;
500   }
501  
502  
503 < #define  wrongsource(m, r)      (r->rsrc>=0 && \
504 <                                source[r->rsrc].so!=r->ro && \
505 <                                (m->otype!=MAT_ILLUM || \
506 <                        objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM))
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))
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))

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