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root/radiance/ray/src/rt/srcsamp.c
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Comparing ray/src/rt/srcsamp.c (file contents):
Revision 2.7 by greg, Sat Feb 22 02:07:29 2003 UTC vs.
Revision 2.16 by greg, Sat Jun 6 02:11:44 2009 UTC

# Line 7 | Line 7 | static const char      RCSid[] = "$Id$";
7   *  External symbols declared in source.h
8   */
9  
10 < /* ====================================================================
11 < * The Radiance Software License, Version 1.0
12 < *
13 < * Copyright (c) 1990 - 2002 The Regents of the University of California,
14 < * through Lawrence Berkeley National Laboratory.   All rights reserved.
15 < *
16 < * Redistribution and use in source and binary forms, with or without
17 < * modification, are permitted provided that the following conditions
18 < * are met:
19 < *
20 < * 1. Redistributions of source code must retain the above copyright
21 < *         notice, this list of conditions and the following disclaimer.
22 < *
23 < * 2. Redistributions in binary form must reproduce the above copyright
24 < *       notice, this list of conditions and the following disclaimer in
25 < *       the documentation and/or other materials provided with the
26 < *       distribution.
27 < *
28 < * 3. The end-user documentation included with the redistribution,
29 < *           if any, must include the following acknowledgment:
30 < *             "This product includes Radiance software
31 < *                 (http://radsite.lbl.gov/)
32 < *                 developed by the Lawrence Berkeley National Laboratory
33 < *               (http://www.lbl.gov/)."
34 < *       Alternately, this acknowledgment may appear in the software itself,
35 < *       if and wherever such third-party acknowledgments normally appear.
36 < *
37 < * 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
38 < *       and "The Regents of the University of California" must
39 < *       not be used to endorse or promote products derived from this
40 < *       software without prior written permission. For written
41 < *       permission, please contact [email protected].
42 < *
43 < * 5. Products derived from this software may not be called "Radiance",
44 < *       nor may "Radiance" appear in their name, without prior written
45 < *       permission of Lawrence Berkeley National Laboratory.
46 < *
47 < * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
48 < * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
49 < * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
50 < * DISCLAIMED.   IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
51 < * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
52 < * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
53 < * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
54 < * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
55 < * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
56 < * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
57 < * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 < * SUCH DAMAGE.
59 < * ====================================================================
60 < *
61 < * This software consists of voluntary contributions made by many
62 < * individuals on behalf of Lawrence Berkeley National Laboratory.   For more
63 < * information on Lawrence Berkeley National Laboratory, please see
64 < * <http://www.lbl.gov/>.
65 < */
10 > #include "copyright.h"
11  
12   #include  "ray.h"
13  
# Line 80 | Line 25 | register RAY  *r;              /* origin is read, direction is set
25   register SRCINDEX  *si;         /* source index (modified to current) */
26   {
27          int  cent[3], size[3], parr[2];
28 +        SRCREC  *srcp;
29          FVECT  vpos;
30          double  d;
31          register int  i;
# Line 106 | Line 52 | nextsample:
52          if (!skipparts(cent, size, parr, si->spt))
53                  error(CONSISTENCY, "bad source partition in nextssamp");
54                                          /* compute sample */
55 +        srcp = source + si->sn;
56          if (dstrsrc > FTINY) {                  /* jitter sample */
57                  dimlist[ndims] = si->sn + 8831;
58                  dimlist[ndims+1] = si->sp + 3109;
59                  d = urand(ilhash(dimlist,ndims+2)+samplendx);
60 <                if (source[si->sn].sflags & SFLAT) {
60 >                if (srcp->sflags & SFLAT) {
61                          multisamp(vpos, 2, d);
62 <                        vpos[2] = 0.5;
62 >                        vpos[SW] = 0.5;
63                  } else
64                          multisamp(vpos, 3, d);
65                  for (i = 0; i < 3; i++)
# Line 123 | Line 70 | nextsample:
70  
71          for (i = 0; i < 3; i++)
72                  vpos[i] += (double)cent[i]/MAXSPART;
73 +                                        /* avoid circular aiming failures */
74 +        if ((srcp->sflags & SCIR) && (si->np > 1 || dstrsrc > 0.7)) {
75 +                FVECT   trim;
76 +                if (srcp->sflags & (SFLAT|SDISTANT)) {
77 +                        d = 1.12837917;         /* correct setflatss() */
78 +                        trim[SU] = d*sqrt(1.0 - 0.5*vpos[SV]*vpos[SV]);
79 +                        trim[SV] = d*sqrt(1.0 - 0.5*vpos[SU]*vpos[SU]);
80 +                        trim[SW] = 0.0;
81 +                } else {
82 +                        trim[SW] = trim[SU] = vpos[SU]*vpos[SU];
83 +                        d = vpos[SV]*vpos[SV];
84 +                        if (d > trim[SW]) trim[SW] = d;
85 +                        trim[SU] += d;
86 +                        d = vpos[SW]*vpos[SW];
87 +                        if (d > trim[SW]) trim[SW] = d;
88 +                        trim[SU] += d;
89 +                        if (trim[SU] > FTINY*FTINY) {
90 +                                d = 1.0/0.7236; /* correct sphsetsrc() */
91 +                                trim[SW] = trim[SV] = trim[SU] =
92 +                                                d*sqrt(trim[SW]/trim[SU]);
93 +                        } else
94 +                                trim[SW] = trim[SV] = trim[SU] = 0.0;
95 +                }
96 +                for (i = 0; i < 3; i++)
97 +                        vpos[i] *= trim[i];
98 +        }
99                                          /* compute direction */
100          for (i = 0; i < 3; i++)
101 <                r->rdir[i] = source[si->sn].sloc[i] +
102 <                                vpos[SU]*source[si->sn].ss[SU][i] +
103 <                                vpos[SV]*source[si->sn].ss[SV][i] +
104 <                                vpos[SW]*source[si->sn].ss[SW][i];
101 >                r->rdir[i] = srcp->sloc[i] +
102 >                                vpos[SU]*srcp->ss[SU][i] +
103 >                                vpos[SV]*srcp->ss[SV][i] +
104 >                                vpos[SW]*srcp->ss[SW][i];
105  
106 <        if (!(source[si->sn].sflags & SDISTANT))
106 >        if (!(srcp->sflags & SDISTANT))
107                  for (i = 0; i < 3; i++)
108                          r->rdir[i] -= r->rorg[i];
109                                          /* compute distance */
# Line 138 | Line 111 | nextsample:
111                  goto nextsample;                /* at source! */
112  
113                                          /* compute sample size */
114 <        if (source[si->sn].sflags & SFLAT) {
114 >        if (srcp->sflags & SFLAT) {
115                  si->dom = sflatform(si->sn, r->rdir);
116                  si->dom *= size[SU]*size[SV]/(MAXSPART*(double)MAXSPART);
117 <        } else if (source[si->sn].sflags & SCYL) {
117 >        } else if (srcp->sflags & SCYL) {
118                  si->dom = scylform(si->sn, r->rdir);
119                  si->dom *= size[SU]/(double)MAXSPART;
120          } else {
121                  si->dom = size[SU]*size[SV]*(double)size[SW] /
122                                  (MAXSPART*MAXSPART*(double)MAXSPART) ;
123          }
124 <        if (source[si->sn].sflags & SDISTANT) {
125 <                si->dom *= source[si->sn].ss2;
124 >        if (srcp->sflags & SDISTANT) {
125 >                si->dom *= srcp->ss2;
126                  return(FHUGE);
127          }
128          if (si->dom <= 1e-4)
129                  goto nextsample;                /* behind source? */
130 <        si->dom *= source[si->sn].ss2/(d*d);
130 >        si->dom *= srcp->ss2/(d*d);
131          return(d);              /* sample OK, return distance */
132   }
133  
# Line 169 | Line 142 | unsigned char  *pt;            /* partition array */
142                                          /* check this partition */
143          p = spart(pt, pp[0]);
144          pp[0]++;
145 <        if (p == S0)                    /* leaf partition */
145 >        if (p == S0) {                  /* leaf partition */
146                  if (pp[1]) {
147                          pp[1]--;
148                          return(0);      /* not there yet */
149                  } else
150                          return(1);      /* we've arrived */
151 +        }
152                                  /* else check lower */
153          sz[p] >>= 1;
154          ct[p] -= sz[p];
# Line 284 | Line 258 | flatpart(si, r)                                /* partition a flat source */
258   register SRCINDEX  *si;
259   register RAY  *r;
260   {
261 <        register FLOAT  *vp;
261 >        register RREAL  *vp;
262          FVECT  v;
263          double  du2, dv2;
264          int  pi;
# Line 295 | Line 269 | register RAY  *r;
269          v[1] = r->rorg[1] - vp[1];
270          v[2] = r->rorg[2] - vp[2];
271          vp = source[si->sn].snorm;
272 <        if (DOT(v,vp) <= FTINY) {       /* behind source */
272 >        if (DOT(v,vp) <= 0.) {          /* behind source */
273                  si->np = 0;
274                  return;
275          }
# Line 368 | Line 342 | scylform(sn, dir)              /* compute cosine for cylinder's pr
342   int  sn;
343   register FVECT  dir;            /* assume normalized */
344   {
345 <        register FLOAT  *dv;
345 >        register RREAL  *dv;
346          double  d;
347  
348          dv = source[sn].ss[SU];

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