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root/radiance/ray/src/util/rfluxmtx.c
Revision: 2.19
Committed: Thu Dec 4 05:26:28 2014 UTC (9 years, 3 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.18: +3 -12 lines
Log Message:
Improved behavior of anisotropic reflections

File Contents

# User Rev Content
1 greg 2.1 #ifndef lint
2 greg 2.19 static const char RCSid[] = "$Id: rfluxmtx.c,v 2.18 2014/08/26 19:10:10 greg Exp $";
3 greg 2.1 #endif
4     /*
5     * Calculate flux transfer matrix or matrices using rcontrib
6     */
7    
8     #include "copyright.h"
9    
10     #include <ctype.h>
11     #include <stdlib.h>
12     #include "rtio.h"
13     #include "rtmath.h"
14 greg 2.12 #include "rtprocess.h"
15 greg 2.1 #include "bsdf.h"
16     #include "bsdf_m.h"
17     #include "random.h"
18     #include "triangulate.h"
19     #include "platform.h"
20    
21     #ifdef getc_unlocked /* avoid horrendous overhead of flockfile */
22     #undef getc
23     #define getc getc_unlocked
24     #endif
25    
26     #ifdef _WIN32
27 greg 2.2 #define SPECIALS " \t\"$*?"
28 greg 2.1 #define QUOTCHAR '"'
29     #else
30 greg 2.2 #define SPECIALS " \t\n'\"()${}*?[];|&"
31 greg 2.1 #define QUOTCHAR '\''
32     #define ALTQUOT '"'
33     #endif
34    
35     #define MAXRCARG 512
36    
37     char *progname; /* global argv[0] */
38    
39 greg 2.16 int verbose = 0; /* verbose mode (< 0 no warnings) */
40 greg 2.1
41     char *rcarg[MAXRCARG+1] = {"rcontrib", "-fo+"};
42     int nrcargs = 2;
43    
44     const char overflowerr[] = "%s: too many arguments!\n";
45    
46     #define CHECKARGC(n) if (nrcargs >= MAXRCARG-(n)) \
47     { fprintf(stderr, overflowerr, progname); exit(1); }
48    
49 greg 2.2 int sampcnt = 0; /* sample count (0==unset) */
50 greg 2.1
51 greg 2.2 char *reinhfn = "reinhartb.cal";
52     char *shirchiufn = "disk2square.cal";
53 greg 2.1 char *kfullfn = "klems_full.cal";
54     char *khalffn = "klems_half.cal";
55     char *kquarterfn = "klems_quarter.cal";
56    
57 greg 2.5 /* string indicating parameters */
58     const char PARAMSTART[] = "@rfluxmtx";
59 greg 2.1
60     /* surface type IDs */
61     #define ST_NONE 0
62     #define ST_POLY 1
63     #define ST_RING 2
64     #define ST_SOURCE 3
65    
66     typedef struct surf_s {
67     struct surf_s *next; /* next surface in list */
68     void *priv; /* private data (malloc'ed) */
69     char sname[32]; /* surface name */
70     FVECT snrm; /* surface normal */
71 greg 2.4 double area; /* surface area / proj. solid angle */
72 greg 2.1 short styp; /* surface type */
73 greg 2.2 short nfargs; /* number of real arguments */
74     double farg[1]; /* real values (extends struct) */
75 greg 2.1 } SURF; /* surface structure */
76    
77     typedef struct {
78     FVECT uva[2]; /* tangent axes */
79     int ntris; /* number of triangles */
80     struct ptri {
81     float afrac; /* fraction of total area */
82     short vndx[3]; /* vertex indices */
83     } tri[1]; /* triangle array (extends struct) */
84     } POLYTRIS; /* triangulated polygon */
85    
86     typedef struct param_s {
87     char hemis[32]; /* hemispherical sampling spec. */
88     int hsiz; /* hemisphere basis size */
89     int nsurfs; /* number of surfaces */
90     SURF *slist; /* list of surfaces */
91     FVECT vup; /* up vector (zero if unset) */
92     FVECT nrm; /* average normal direction */
93     FVECT udir, vdir; /* v-up tangent axes */
94     char *outfn; /* output file name (receiver) */
95     int (*sample_basis)(struct param_s *p, int, FILE *);
96     } PARAMS; /* sender/receiver parameters */
97    
98     PARAMS curparams;
99     char curmod[128];
100 greg 2.6 char newparams[1024];
101 greg 2.1
102     typedef int SURFSAMP(FVECT, SURF *, double);
103    
104     static SURFSAMP ssamp_bad, ssamp_poly, ssamp_ring;
105    
106     SURFSAMP *orig_in_surf[4] = {
107     ssamp_bad, ssamp_poly, ssamp_ring, ssamp_bad
108     };
109    
110     /* Clear parameter set */
111     static void
112     clear_params(PARAMS *p, int reset_only)
113     {
114     while (p->slist != NULL) {
115     SURF *sdel = p->slist;
116     p->slist = sdel->next;
117     if (sdel->priv != NULL)
118     free(sdel->priv);
119     free(sdel);
120     }
121     if (reset_only) {
122     p->nsurfs = 0;
123     memset(p->nrm, 0, sizeof(FVECT));
124     memset(p->vup, 0, sizeof(FVECT));
125     p->outfn = NULL;
126     return;
127     }
128 greg 2.6 memset(p, 0, sizeof(PARAMS));
129 greg 2.1 }
130    
131     /* Get surface type from name */
132     static int
133     surf_type(const char *otype)
134     {
135     if (!strcmp(otype, "polygon"))
136     return(ST_POLY);
137     if (!strcmp(otype, "ring"))
138     return(ST_RING);
139     if (!strcmp(otype, "source"))
140     return(ST_SOURCE);
141     return(ST_NONE);
142     }
143    
144     /* Add arguments to oconv command */
145     static char *
146     oconv_command(int ac, char *av[])
147     {
148 greg 2.13 static char oconvbuf[2048] = "!oconv -f ";
149     char *cp = oconvbuf + 10;
150     char *recv = *av++;
151    
152     if (ac-- <= 0)
153     return(NULL);
154 greg 2.1 while (ac-- > 0) {
155 greg 2.13 strcpy(cp, *av++);
156     while (*cp) cp++;
157     *cp++ = ' ';
158 greg 2.1 if (cp >= oconvbuf+(sizeof(oconvbuf)-32)) {
159     fputs(progname, stderr);
160     fputs(": too many file arguments!\n", stderr);
161     exit(1);
162     }
163     }
164 greg 2.13 strcpy(cp, recv); /* receiver goes last */
165 greg 2.1 return(oconvbuf);
166     }
167    
168     /* Check if any of the characters in str2 are found in str1 */
169     static int
170     matchany(const char *str1, const char *str2)
171     {
172     while (*str1) {
173     const char *cp = str2;
174     while (*cp)
175     if (*cp++ == *str1)
176     return(*str1);
177     ++str1;
178     }
179     return(0);
180     }
181    
182    
183     /* Convert a set of arguments into a command line for pipe() or system() */
184     static char *
185     convert_commandline(char *cmd, const int len, char *av[])
186     {
187     int match;
188     char *cp;
189    
190     for (cp = cmd; *av != NULL; av++) {
191     const int n = strlen(*av);
192     if (cp+n >= cmd+(len-3)) {
193     fputs(progname, stderr);
194     return(NULL);
195     }
196     if ((match = matchany(*av, SPECIALS))) {
197     const int quote =
198     #ifdef ALTQUOT
199     (match == QUOTCHAR) ? ALTQUOT :
200     #endif
201     QUOTCHAR;
202     *cp++ = quote;
203     strcpy(cp, *av);
204     cp += n;
205     *cp++ = quote;
206     } else {
207     strcpy(cp, *av);
208     cp += n;
209     }
210     *cp++ = ' ';
211     }
212     if (cp <= cmd)
213     return(NULL);
214     *--cp = '\0';
215     return(cmd);
216     }
217    
218     /* Open a pipe to/from a command given as an argument list */
219     static FILE *
220     popen_arglist(char *av[], char *mode)
221     {
222     char cmd[10240];
223    
224     if (!convert_commandline(cmd, sizeof(cmd), av)) {
225     fputs(progname, stderr);
226     fputs(": command line too long in popen_arglist()\n", stderr);
227     return(NULL);
228     }
229 greg 2.16 if (verbose > 0)
230 greg 2.1 fprintf(stderr, "%s: opening pipe %s: %s\n",
231     progname, (*mode=='w') ? "to" : "from", cmd);
232     return(popen(cmd, mode));
233     }
234    
235     #ifdef _WIN32
236     /* Execute system command (Windows version) */
237     static int
238     my_exec(char *av[])
239     {
240     char cmd[10240];
241    
242     if (!convert_commandline(cmd, sizeof(cmd), av)) {
243     fputs(progname, stderr);
244     fputs(": command line too long in my_exec()\n", stderr);
245     return(1);
246     }
247 greg 2.16 if (verbose > 0)
248 greg 2.1 fprintf(stderr, "%s: running: %s\n", progname, cmd);
249     return(system(cmd));
250     }
251     #else
252     /* Execute system command in our stead (Unix version) */
253     static int
254     my_exec(char *av[])
255     {
256     char *compath;
257    
258     if ((compath = getpath((char *)av[0], getenv("PATH"), X_OK)) == NULL) {
259     fprintf(stderr, "%s: cannot locate %s\n", progname, av[0]);
260     return(1);
261     }
262 greg 2.16 if (verbose > 0) {
263 greg 2.1 char cmd[4096];
264     if (!convert_commandline(cmd, sizeof(cmd), av))
265     strcpy(cmd, "COMMAND TOO LONG TO SHOW");
266     fprintf(stderr, "%s: running: %s\n", progname, cmd);
267     }
268     execv(compath, av); /* successful call never returns */
269     perror(compath);
270     return(1);
271     }
272     #endif
273    
274     /* Get normalized direction vector from string specification */
275     static int
276     get_direction(FVECT dv, const char *s)
277     {
278     int sign = 1;
279     int axis = 0;
280    
281     memset(dv, 0, sizeof(FVECT));
282     nextchar:
283     switch (*s) {
284     case '+':
285     ++s;
286     goto nextchar;
287     case '-':
288     sign = -sign;
289     ++s;
290     goto nextchar;
291     case 'z':
292     case 'Z':
293     ++axis;
294     case 'y':
295     case 'Y':
296     ++axis;
297     case 'x':
298     case 'X':
299     dv[axis] = sign;
300     return(!s[1] | isspace(s[1]));
301     default:
302     break;
303     }
304     #ifdef SMLFLT
305     if (sscanf(s, "%f,%f,%f", &dv[0], &dv[1], &dv[2]) != 3)
306     #else
307     if (sscanf(s, "%lf,%lf,%lf", &dv[0], &dv[1], &dv[2]) != 3)
308     #endif
309     return(0);
310     dv[0] *= (RREAL)sign;
311     return(normalize(dv) > 0);
312     }
313    
314     /* Parse program parameters (directives) */
315     static int
316 greg 2.6 parse_params(PARAMS *p, char *pargs)
317 greg 2.1 {
318     char *cp = pargs;
319     int nparams = 0;
320     int i;
321    
322 greg 2.15 for ( ; ; ) {
323 greg 2.1 switch (*cp++) {
324     case 'h':
325     if (*cp++ != '=')
326     break;
327 greg 2.6 p->hsiz = 0;
328 greg 2.1 i = 0;
329     while (*cp && !isspace(*cp)) {
330     if (isdigit(*cp))
331 greg 2.6 p->hsiz = 10*p->hsiz + *cp - '0';
332     p->hemis[i++] = *cp++;
333 greg 2.1 }
334     if (!i)
335     break;
336 greg 2.6 p->hemis[i] = '\0';
337     p->hsiz += !p->hsiz;
338 greg 2.1 ++nparams;
339     continue;
340     case 'u':
341     if (*cp++ != '=')
342     break;
343 greg 2.6 if (!get_direction(p->vup, cp))
344 greg 2.1 break;
345 greg 2.15 while (*cp && !isspace(*cp++))
346     ;
347 greg 2.1 ++nparams;
348     continue;
349     case 'o':
350     if (*cp++ != '=')
351     break;
352     i = 0;
353     while (*cp && !isspace(*cp++))
354     i++;
355     if (!i)
356     break;
357     *--cp = '\0';
358 greg 2.6 p->outfn = savqstr(cp-i);
359 greg 2.1 *cp++ = ' ';
360     ++nparams;
361     continue;
362     case ' ':
363     case '\t':
364     case '\r':
365 greg 2.15 continue;
366 greg 2.1 case '\n':
367     case '\0':
368     return(nparams);
369     default:
370     break;
371     }
372 greg 2.15 break;
373     }
374     fprintf(stderr, "%s: bad parameter string: %s", progname, pargs);
375 greg 2.1 exit(1);
376     return(-1); /* pro forma return */
377     }
378    
379     /* Add receiver arguments (directives) corresponding to the current modifier */
380     static void
381     finish_receiver(void)
382     {
383 greg 2.4 char sbuf[256];
384     int uniform = 0;
385 greg 2.2 char *calfn = NULL;
386 greg 2.3 char *params = NULL;
387 greg 2.2 char *binv = NULL;
388     char *binf = NULL;
389     char *nbins = NULL;
390 greg 2.1
391     if (!curmod[0]) {
392     fputs(progname, stderr);
393     fputs(": missing receiver surface!\n", stderr);
394     exit(1);
395     }
396     if (curparams.outfn != NULL) { /* add output file spec. */
397     CHECKARGC(2);
398     rcarg[nrcargs++] = "-o";
399     rcarg[nrcargs++] = curparams.outfn;
400     }
401 greg 2.4 /* check arguments */
402 greg 2.1 if (!curparams.hemis[0]) {
403     fputs(progname, stderr);
404     fputs(": missing hemisphere sampling type!\n", stderr);
405     exit(1);
406     }
407     if (normalize(curparams.nrm) == 0) {
408     fputs(progname, stderr);
409     fputs(": undefined normal for hemisphere sampling\n", stderr);
410     exit(1);
411     }
412 greg 2.10 if (normalize(curparams.vup) == 0) {
413 greg 2.1 if (fabs(curparams.nrm[2]) < .7)
414     curparams.vup[2] = 1;
415     else
416     curparams.vup[1] = 1;
417 greg 2.10 }
418 greg 2.4 /* determine sample type/bin */
419 greg 2.1 if (tolower(curparams.hemis[0]) == 'u' | curparams.hemis[0] == '1') {
420 greg 2.3 binv = "0"; /* uniform sampling -- one bin */
421 greg 2.4 uniform = 1;
422 greg 2.1 } else if (tolower(curparams.hemis[0]) == 's' &&
423     tolower(curparams.hemis[1]) == 'c') {
424 greg 2.2 /* assign parameters */
425 greg 2.1 if (curparams.hsiz <= 1) {
426     fputs(progname, stderr);
427     fputs(": missing size for Shirley-Chiu sampling!\n", stderr);
428     exit(1);
429     }
430 greg 2.3 calfn = shirchiufn; shirchiufn = NULL;
431 greg 2.9 sprintf(sbuf, "SCdim=%d,rNx=%g,rNy=%g,rNz=%g,Ux=%g,Uy=%g,Uz=%g",
432 greg 2.2 curparams.hsiz,
433     curparams.nrm[0], curparams.nrm[1], curparams.nrm[2],
434     curparams.vup[0], curparams.vup[1], curparams.vup[2]);
435 greg 2.3 params = savqstr(sbuf);
436 greg 2.2 binv = "scbin";
437     nbins = "SCdim*SCdim";
438 greg 2.1 } else if ((tolower(curparams.hemis[0]) == 'r') |
439     (tolower(curparams.hemis[0]) == 't')) {
440 greg 2.2 calfn = reinhfn; reinhfn = NULL;
441 greg 2.9 sprintf(sbuf, "MF=%d,rNx=%g,rNy=%g,rNz=%g,Ux=%g,Uy=%g,Uz=%g",
442 greg 2.3 curparams.hsiz,
443     curparams.nrm[0], curparams.nrm[1], curparams.nrm[2],
444     curparams.vup[0], curparams.vup[1], curparams.vup[2]);
445     params = savqstr(sbuf);
446     binv = "rbin";
447     nbins = "Nrbins";
448 greg 2.1 } else if (tolower(curparams.hemis[0]) == 'k' &&
449     !curparams.hemis[1] |
450     (tolower(curparams.hemis[1]) == 'f') |
451     (curparams.hemis[1] == '1')) {
452 greg 2.2 calfn = kfullfn; kfullfn = NULL;
453     binf = "kbin";
454     nbins = "Nkbins";
455 greg 2.1 } else if (tolower(curparams.hemis[0]) == 'k' &&
456     (tolower(curparams.hemis[1]) == 'h') |
457     (curparams.hemis[1] == '2')) {
458 greg 2.2 calfn = khalffn; khalffn = NULL;
459     binf = "khbin";
460     nbins = "Nkhbins";
461 greg 2.1 } else if (tolower(curparams.hemis[0]) == 'k' &&
462     (tolower(curparams.hemis[1]) == 'q') |
463     (curparams.hemis[1] == '4')) {
464 greg 2.2 calfn = kquarterfn; kquarterfn = NULL;
465     binf = "kqbin";
466     nbins = "Nkqbins";
467 greg 2.1 } else {
468     fprintf(stderr, "%s: unrecognized hemisphere sampling: h=%s\n",
469     progname, curparams.hemis);
470     exit(1);
471     }
472 greg 2.4 if (!uniform & (curparams.slist->styp == ST_SOURCE)) {
473     SURF *sp;
474     for (sp = curparams.slist; sp != NULL; sp = sp->next)
475     if (fabs(sp->area - PI) > 1e-3) {
476     fprintf(stderr, "%s: source '%s' must be 180-degrees\n",
477     progname, sp->sname);
478     exit(1);
479     }
480     }
481 greg 2.2 if (calfn != NULL) { /* add cal file if needed */
482     CHECKARGC(2);
483     rcarg[nrcargs++] = "-f";
484     rcarg[nrcargs++] = calfn;
485     }
486 greg 2.3 if (params != NULL) { /* parameters _after_ cal file */
487     CHECKARGC(2);
488     rcarg[nrcargs++] = "-p";
489     rcarg[nrcargs++] = params;
490     }
491 greg 2.2 if (nbins != NULL) { /* add #bins if set */
492     CHECKARGC(2);
493     rcarg[nrcargs++] = "-bn";
494     rcarg[nrcargs++] = nbins;
495     }
496 greg 2.3 if (binv != NULL) {
497 greg 2.2 CHECKARGC(2); /* assign bin variable */
498     rcarg[nrcargs++] = "-b";
499     rcarg[nrcargs++] = binv;
500     } else if (binf != NULL) {
501     CHECKARGC(2); /* assign bin function */
502 greg 2.3 rcarg[nrcargs++] = "-b";
503 greg 2.2 sprintf(sbuf, "%s(%g,%g,%g,%g,%g,%g)", binf,
504     curparams.nrm[0], curparams.nrm[1], curparams.nrm[2],
505     curparams.vup[0], curparams.vup[1], curparams.vup[2]);
506     rcarg[nrcargs++] = savqstr(sbuf);
507     }
508     CHECKARGC(2); /* modifier argument goes last */
509 greg 2.1 rcarg[nrcargs++] = "-m";
510     rcarg[nrcargs++] = savqstr(curmod);
511     }
512    
513     /* Make randomly oriented tangent plane axes for given normal direction */
514     static void
515     make_axes(FVECT uva[2], const FVECT nrm)
516     {
517     int i;
518    
519 greg 2.19 if (!getperpendicular(uva[0], nrm)) {
520 greg 2.1 fputs(progname, stderr);
521     fputs(": bad surface normal in make_axes!\n", stderr);
522     exit(1);
523     }
524 greg 2.19 fcross(uva[1], nrm, uva[0]);
525 greg 2.1 }
526    
527     /* Illegal sender surfaces end up here */
528     static int
529     ssamp_bad(FVECT orig, SURF *sp, double x)
530     {
531     fprintf(stderr, "%s: illegal sender surface '%s'\n",
532     progname, sp->sname);
533     return(0);
534     }
535    
536     /* Generate origin on ring surface from uniform random variable */
537     static int
538     ssamp_ring(FVECT orig, SURF *sp, double x)
539     {
540     FVECT *uva = (FVECT *)sp->priv;
541     double samp2[2];
542     double uv[2];
543     int i;
544    
545     if (uva == NULL) { /* need tangent axes */
546     uva = (FVECT *)malloc(sizeof(FVECT)*2);
547     if (uva == NULL) {
548     fputs(progname, stderr);
549     fputs(": out of memory in ssamp_ring!\n", stderr);
550     return(0);
551     }
552     make_axes(uva, sp->snrm);
553     sp->priv = (void *)uva;
554     }
555     SDmultiSamp(samp2, 2, x);
556 greg 2.6 samp2[0] = sqrt(samp2[0]*sp->area*(1./PI) + sp->farg[6]*sp->farg[6]);
557 greg 2.1 samp2[1] *= 2.*PI;
558     uv[0] = samp2[0]*tcos(samp2[1]);
559     uv[1] = samp2[0]*tsin(samp2[1]);
560     for (i = 3; i--; )
561     orig[i] = sp->farg[i] + uv[0]*uva[0][i] + uv[1]*uva[1][i];
562     return(1);
563     }
564    
565     /* Add triangle to polygon's list (call-back function) */
566     static int
567     add_triangle(const Vert2_list *tp, int a, int b, int c)
568     {
569     POLYTRIS *ptp = (POLYTRIS *)tp->p;
570     struct ptri *trip = ptp->tri + ptp->ntris++;
571    
572     trip->vndx[0] = a;
573     trip->vndx[1] = b;
574     trip->vndx[2] = c;
575     return(1);
576     }
577    
578     /* Generate origin on polygon surface from uniform random variable */
579     static int
580     ssamp_poly(FVECT orig, SURF *sp, double x)
581     {
582     POLYTRIS *ptp = (POLYTRIS *)sp->priv;
583     double samp2[2];
584     double *v0, *v1, *v2;
585     int i;
586    
587     if (ptp == NULL) { /* need to triangulate */
588     ptp = (POLYTRIS *)malloc(sizeof(POLYTRIS) +
589     sizeof(struct ptri)*(sp->nfargs/3 - 3));
590     if (ptp == NULL)
591     goto memerr;
592     if (sp->nfargs == 3) { /* simple case */
593     ptp->ntris = 1;
594     ptp->tri[0].vndx[0] = 0;
595     ptp->tri[0].vndx[1] = 1;
596     ptp->tri[0].vndx[2] = 2;
597     ptp->tri[0].afrac = 1;
598     } else {
599     Vert2_list *v2l = polyAlloc(sp->nfargs/3);
600     if (v2l == NULL)
601     goto memerr;
602     make_axes(ptp->uva, sp->snrm);
603     for (i = v2l->nv; i--; ) {
604     v2l->v[i].mX = DOT(sp->farg+3*i, ptp->uva[0]);
605     v2l->v[i].mY = DOT(sp->farg+3*i, ptp->uva[1]);
606     }
607     ptp->ntris = 0;
608     v2l->p = (void *)ptp;
609 greg 2.7 if (!polyTriangulate(v2l, add_triangle)) {
610     fprintf(stderr,
611     "%s: cannot triangulate polygon '%s'\n",
612     progname, sp->sname);
613 greg 2.1 return(0);
614 greg 2.7 }
615 greg 2.1 for (i = ptp->ntris; i--; ) {
616     int a = ptp->tri[i].vndx[0];
617     int b = ptp->tri[i].vndx[1];
618     int c = ptp->tri[i].vndx[2];
619     ptp->tri[i].afrac =
620     (v2l->v[a].mX*v2l->v[b].mY -
621     v2l->v[b].mX*v2l->v[a].mY +
622     v2l->v[b].mX*v2l->v[c].mY -
623     v2l->v[c].mX*v2l->v[b].mY +
624     v2l->v[c].mX*v2l->v[a].mY -
625     v2l->v[a].mX*v2l->v[c].mY) /
626     (2.*sp->area);
627     }
628     polyFree(v2l);
629     }
630     sp->priv = (void *)ptp;
631     }
632     /* pick triangle by partial area */
633     for (i = 0; i < ptp->ntris && x > ptp->tri[i].afrac; i++)
634     x -= ptp->tri[i].afrac;
635     SDmultiSamp(samp2, 2, x/ptp->tri[i].afrac);
636     samp2[0] *= samp2[1] = sqrt(samp2[1]);
637     samp2[1] = 1. - samp2[1];
638     v0 = sp->farg + 3*ptp->tri[i].vndx[0];
639     v1 = sp->farg + 3*ptp->tri[i].vndx[1];
640     v2 = sp->farg + 3*ptp->tri[i].vndx[2];
641     for (i = 3; i--; )
642     orig[i] = v0[i] + samp2[0]*(v1[i] - v0[i])
643     + samp2[1]*(v2[i] - v0[i]) ;
644     return(1);
645     memerr:
646     fputs(progname, stderr);
647     fputs(": out of memory in ssamp_poly!\n", stderr);
648     return(0);
649     }
650    
651     /* Compute sample origin based on projected areas of sender subsurfaces */
652     static int
653     sample_origin(PARAMS *p, FVECT orig, const FVECT rdir, double x)
654     {
655     static double *projsa;
656     static int nall;
657     double tarea = 0;
658     int i;
659     SURF *sp;
660     /* special case for lone surface */
661     if (p->nsurfs == 1) {
662     sp = p->slist;
663 greg 2.7 if (DOT(sp->snrm, rdir) >= -FTINY) {
664     fprintf(stderr,
665     "%s: internal - sample behind sender '%s'\n",
666     progname, sp->sname);
667     return(0);
668     }
669 greg 2.1 return((*orig_in_surf[sp->styp])(orig, sp, x));
670     }
671     if (p->nsurfs > nall) { /* (re)allocate surface area cache */
672     if (projsa) free(projsa);
673     projsa = (double *)malloc(sizeof(double)*p->nsurfs);
674     if (!projsa) return(0);
675     nall = p->nsurfs;
676     }
677     /* compute projected areas */
678     for (i = 0, sp = p->slist; sp != NULL; i++, sp = sp->next) {
679     projsa[i] = -DOT(sp->snrm, rdir) * sp->area;
680     tarea += projsa[i] *= (double)(projsa[i] > FTINY);
681     }
682 greg 2.7 if (tarea <= FTINY) { /* wrong side of sender? */
683     fputs(progname, stderr);
684     fputs(": internal - sample behind all sender elements!\n",
685     stderr);
686 greg 2.1 return(0);
687 greg 2.7 }
688 greg 2.1 tarea *= x; /* get surface from list */
689     for (i = 0, sp = p->slist; tarea > projsa[i]; sp = sp->next)
690     tarea -= projsa[i++];
691     return((*orig_in_surf[sp->styp])(orig, sp, tarea/projsa[i]));
692     }
693    
694     /* Uniform sample generator */
695     static int
696     sample_uniform(PARAMS *p, int b, FILE *fp)
697     {
698     int n = sampcnt;
699     double samp3[3];
700     double duvw[3];
701     FVECT orig_dir[2];
702     int i;
703    
704     if (fp == NULL) /* just requesting number of bins? */
705     return(1);
706    
707     while (n--) { /* stratified hemisphere sampling */
708     SDmultiSamp(samp3, 3, (n+frandom())/sampcnt);
709     SDsquare2disk(duvw, samp3[1], samp3[2]);
710     duvw[2] = -sqrt(1. - duvw[0]*duvw[0] - duvw[1]*duvw[1]);
711     for (i = 3; i--; )
712     orig_dir[1][i] = duvw[0]*p->udir[i] +
713     duvw[1]*p->vdir[i] +
714     duvw[2]*p->nrm[i] ;
715     if (!sample_origin(p, orig_dir[0], orig_dir[1], samp3[0]))
716     return(0);
717     if (fwrite(orig_dir, sizeof(FVECT), 2, fp) != 2)
718     return(0);
719     }
720     return(1);
721     }
722    
723     /* Shirly-Chiu sample generator */
724     static int
725     sample_shirchiu(PARAMS *p, int b, FILE *fp)
726     {
727     int n = sampcnt;
728     double samp3[3];
729     double duvw[3];
730     FVECT orig_dir[2];
731     int i;
732    
733     if (fp == NULL) /* just requesting number of bins? */
734     return(p->hsiz*p->hsiz);
735    
736     while (n--) { /* stratified sampling */
737     SDmultiSamp(samp3, 3, (n+frandom())/sampcnt);
738     SDsquare2disk(duvw, (b/p->hsiz + samp3[1])/curparams.hsiz,
739     (b%p->hsiz + samp3[2])/curparams.hsiz);
740     duvw[2] = sqrt(1. - duvw[0]*duvw[0] - duvw[1]*duvw[1]);
741     for (i = 3; i--; )
742     orig_dir[1][i] = -duvw[0]*p->udir[i] -
743     duvw[1]*p->vdir[i] -
744     duvw[2]*p->nrm[i] ;
745     if (!sample_origin(p, orig_dir[0], orig_dir[1], samp3[0]))
746     return(0);
747     if (fwrite(orig_dir, sizeof(FVECT), 2, fp) != 2)
748     return(0);
749     }
750     return(1);
751     }
752    
753     /* Reinhart/Tregenza sample generator */
754     static int
755     sample_reinhart(PARAMS *p, int b, FILE *fp)
756     {
757     #define T_NALT 7
758     static const int tnaz[T_NALT] = {30, 30, 24, 24, 18, 12, 6};
759     const int RowMax = T_NALT*p->hsiz + 1;
760 greg 2.7 const double RAH = (.5*PI)/(RowMax-.5);
761 greg 2.1 #define rnaz(r) (r >= RowMax-1 ? 1 : p->hsiz*tnaz[r/p->hsiz])
762     int n = sampcnt;
763     int row, col;
764     double samp3[3];
765     double alt, azi;
766     double duvw[3];
767     FVECT orig_dir[2];
768     int i;
769    
770     if (fp == NULL) { /* just requesting number of bins? */
771     n = 0;
772     for (row = RowMax; row--; ) n += rnaz(row);
773     return(n);
774     }
775     row = 0; /* identify row & column */
776     col = b;
777     while (col >= rnaz(row)) {
778     col -= rnaz(row);
779     ++row;
780     }
781     while (n--) { /* stratified sampling */
782     SDmultiSamp(samp3, 3, (n+frandom())/sampcnt);
783     alt = (row+samp3[1])*RAH;
784     azi = (2.*PI)*(col+samp3[2]-.5)/rnaz(row);
785 greg 2.7 duvw[2] = cos(alt); /* measured from horizon */
786 greg 2.18 duvw[0] = tsin(azi)*duvw[2];
787     duvw[1] = tcos(azi)*duvw[2];
788 greg 2.1 duvw[2] = sqrt(1. - duvw[2]*duvw[2]);
789     for (i = 3; i--; )
790     orig_dir[1][i] = -duvw[0]*p->udir[i] -
791     duvw[1]*p->vdir[i] -
792     duvw[2]*p->nrm[i] ;
793     if (!sample_origin(p, orig_dir[0], orig_dir[1], samp3[0]))
794     return(0);
795     if (fwrite(orig_dir, sizeof(FVECT), 2, fp) != 2)
796     return(0);
797     }
798     return(1);
799     #undef rnaz
800     #undef T_NALT
801     }
802    
803     /* Klems sample generator */
804     static int
805     sample_klems(PARAMS *p, int b, FILE *fp)
806     {
807     static const char bname[4][20] = {
808     "LBNL/Klems Full",
809     "LBNL/Klems Half",
810     "INTERNAL ERROR",
811     "LBNL/Klems Quarter"
812     };
813     static ANGLE_BASIS *kbasis[4];
814     const int bi = p->hemis[1] - '1';
815     int n = sampcnt;
816     double samp2[2];
817     double duvw[3];
818     FVECT orig_dir[2];
819     int i;
820    
821     if (!kbasis[bi]) { /* need to get basis, first */
822     for (i = 4; i--; )
823     if (!strcasecmp(abase_list[i].name, bname[bi])) {
824     kbasis[bi] = &abase_list[i];
825     break;
826     }
827     if (i < 0) {
828     fprintf(stderr, "%s: unknown hemisphere basis '%s'\n",
829     progname, bname[bi]);
830     return(0);
831     }
832     }
833     if (fp == NULL) /* just requesting number of bins? */
834     return(kbasis[bi]->nangles);
835    
836     while (n--) { /* stratified sampling */
837     SDmultiSamp(samp2, 2, (n+frandom())/sampcnt);
838 greg 2.17 if (!bi_getvec(duvw, b+samp2[1], kbasis[bi]))
839 greg 2.1 return(0);
840     for (i = 3; i--; )
841     orig_dir[1][i] = duvw[0]*p->udir[i] +
842     duvw[1]*p->vdir[i] +
843     duvw[2]*p->nrm[i] ;
844     if (!sample_origin(p, orig_dir[0], orig_dir[1], samp2[0]))
845     return(0);
846     if (fwrite(orig_dir, sizeof(FVECT), 2, fp) != 2)
847     return(0);
848     }
849     return(1);
850     }
851    
852     /* Prepare hemisphere basis sampler that will send rays to rcontrib */
853     static int
854     prepare_sampler(void)
855     {
856     if (curparams.slist == NULL) { /* missing sample surface! */
857     fputs(progname, stderr);
858     fputs(": no sender surface!\n", stderr);
859     return(-1);
860     }
861 greg 2.16 /* misplaced output file spec. */
862     if ((curparams.outfn != NULL) & (verbose >= 0))
863 greg 2.1 fprintf(stderr, "%s: warning - ignoring output file in sender ('%s')\n",
864     progname, curparams.outfn);
865     /* check/set basis hemisphere */
866     if (!curparams.hemis[0]) {
867     fputs(progname, stderr);
868     fputs(": missing sender sampling type!\n", stderr);
869     return(-1);
870     }
871     if (normalize(curparams.nrm) == 0) {
872     fputs(progname, stderr);
873     fputs(": undefined normal for sender sampling\n", stderr);
874     return(-1);
875     }
876 greg 2.10 if (normalize(curparams.vup) == 0) {
877 greg 2.1 if (fabs(curparams.nrm[2]) < .7)
878     curparams.vup[2] = 1;
879     else
880     curparams.vup[1] = 1;
881 greg 2.10 }
882 greg 2.1 VCROSS(curparams.udir, curparams.vup, curparams.nrm);
883     if (normalize(curparams.udir) == 0) {
884     fputs(progname, stderr);
885     fputs(": up vector coincides with sender normal\n", stderr);
886     return(-1);
887     }
888     VCROSS(curparams.vdir, curparams.nrm, curparams.udir);
889     if (tolower(curparams.hemis[0]) == 'u' | curparams.hemis[0] == '1')
890     curparams.sample_basis = sample_uniform;
891     else if (tolower(curparams.hemis[0]) == 's' &&
892     tolower(curparams.hemis[1]) == 'c')
893     curparams.sample_basis = sample_shirchiu;
894     else if ((tolower(curparams.hemis[0]) == 'r') |
895     (tolower(curparams.hemis[0]) == 't'))
896     curparams.sample_basis = sample_reinhart;
897     else if (tolower(curparams.hemis[0]) == 'k') {
898     switch (curparams.hemis[1]) {
899     case '1':
900     case '2':
901     case '4':
902     break;
903     case 'f':
904     case 'F':
905     case '\0':
906     curparams.hemis[1] = '1';
907     break;
908     case 'h':
909     case 'H':
910     curparams.hemis[1] = '2';
911     break;
912     case 'q':
913     case 'Q':
914     curparams.hemis[1] = '4';
915     break;
916     default:
917     goto unrecognized;
918     }
919     curparams.hemis[2] = '\0';
920     curparams.sample_basis = sample_klems;
921     } else
922     goto unrecognized;
923     /* return number of bins */
924     return((*curparams.sample_basis)(&curparams,0,NULL));
925     unrecognized:
926     fprintf(stderr, "%s: unrecognized sender sampling: h=%s\n",
927     progname, curparams.hemis);
928     return(-1);
929     }
930    
931     /* Compute normal and area for polygon */
932     static int
933     finish_polygon(SURF *p)
934     {
935     const int nv = p->nfargs / 3;
936     FVECT e1, e2, vc;
937     int i;
938    
939     memset(p->snrm, 0, sizeof(FVECT));
940     VSUB(e1, p->farg+3, p->farg);
941     for (i = 2; i < nv; i++) {
942     VSUB(e2, p->farg+3*i, p->farg);
943     VCROSS(vc, e1, e2);
944     p->snrm[0] += vc[0];
945     p->snrm[1] += vc[1];
946     p->snrm[2] += vc[2];
947     VCOPY(e1, e2);
948     }
949     p->area = normalize(p->snrm)*0.5;
950     return(p->area > FTINY);
951     }
952    
953     /* Add a surface to our current parameters */
954     static void
955     add_surface(int st, const char *oname, FILE *fp)
956     {
957     SURF *snew;
958     int n;
959     /* get floating-point arguments */
960     if (!fscanf(fp, "%d", &n)) return;
961     while (n-- > 0) fscanf(fp, "%*s");
962     if (!fscanf(fp, "%d", &n)) return;
963     while (n-- > 0) fscanf(fp, "%*d");
964     if (!fscanf(fp, "%d", &n) || n <= 0) return;
965     snew = (SURF *)malloc(sizeof(SURF) + sizeof(double)*(n-1));
966     if (snew == NULL) {
967     fputs(progname, stderr);
968     fputs(": out of memory!\n", stderr);
969     exit(1);
970     }
971     strncpy(snew->sname, oname, sizeof(snew->sname)-1);
972     snew->sname[sizeof(snew->sname)-1] = '\0';
973     snew->styp = st;
974     snew->priv = NULL;
975     snew->nfargs = n;
976     for (n = 0; n < snew->nfargs; n++)
977     if (fscanf(fp, "%lf", &snew->farg[n]) != 1) {
978     fprintf(stderr, "%s: error reading arguments for '%s'\n",
979     progname, oname);
980     exit(1);
981     }
982     switch (st) {
983     case ST_RING:
984     if (snew->nfargs != 8)
985     goto badcount;
986     VCOPY(snew->snrm, snew->farg+3);
987     if (normalize(snew->snrm) == 0)
988     goto badnorm;
989     if (snew->farg[7] < snew->farg[6]) {
990     double t = snew->farg[7];
991     snew->farg[7] = snew->farg[6];
992     snew->farg[6] = t;
993     }
994     snew->area = PI*(snew->farg[7]*snew->farg[7] -
995     snew->farg[6]*snew->farg[6]);
996     break;
997     case ST_POLY:
998     if (snew->nfargs < 9 || snew->nfargs % 3)
999     goto badcount;
1000     finish_polygon(snew);
1001     break;
1002     case ST_SOURCE:
1003     if (snew->nfargs != 4)
1004     goto badcount;
1005 greg 2.8 for (n = 3; n--; ) /* need to reverse "normal" */
1006     snew->snrm[n] = -snew->farg[n];
1007 greg 2.1 if (normalize(snew->snrm) == 0)
1008     goto badnorm;
1009 greg 2.4 snew->area = sin((PI/180./2.)*snew->farg[3]);
1010     snew->area *= PI*snew->area;
1011 greg 2.1 break;
1012     }
1013 greg 2.16 if ((snew->area <= FTINY) & (verbose >= 0)) {
1014 greg 2.1 fprintf(stderr, "%s: warning - zero area for surface '%s'\n",
1015     progname, oname);
1016     free(snew);
1017     return;
1018     }
1019     VSUM(curparams.nrm, curparams.nrm, snew->snrm, snew->area);
1020     snew->next = curparams.slist;
1021     curparams.slist = snew;
1022     curparams.nsurfs++;
1023     return;
1024     badcount:
1025 greg 2.7 fprintf(stderr, "%s: bad argument count for surface element '%s'\n",
1026 greg 2.1 progname, oname);
1027     exit(1);
1028     badnorm:
1029 greg 2.7 fprintf(stderr, "%s: bad orientation for surface element '%s'\n",
1030 greg 2.1 progname, oname);
1031     exit(1);
1032     }
1033    
1034     /* Parse a receiver object (look for modifiers to add to rcontrib command) */
1035     static int
1036     add_recv_object(FILE *fp)
1037     {
1038     int st;
1039     char thismod[128], otype[32], oname[128];
1040     int n;
1041    
1042     if (fscanf(fp, "%s %s %s", thismod, otype, oname) != 3)
1043     return(0); /* must have hit EOF! */
1044     if (!strcmp(otype, "alias")) {
1045     fscanf(fp, "%*s"); /* skip alias */
1046     return(0);
1047     }
1048     /* is it a new receiver? */
1049     if ((st = surf_type(otype)) != ST_NONE) {
1050     if (curparams.slist != NULL && (st == ST_SOURCE) ^
1051     (curparams.slist->styp == ST_SOURCE)) {
1052     fputs(progname, stderr);
1053     fputs(": cannot mix source/non-source receivers!\n", stderr);
1054     return(-1);
1055     }
1056     if (strcmp(thismod, curmod)) {
1057     if (curmod[0]) { /* output last receiver? */
1058     finish_receiver();
1059     clear_params(&curparams, 1);
1060     }
1061 greg 2.6 parse_params(&curparams, newparams);
1062     newparams[0] = '\0';
1063 greg 2.1 strcpy(curmod, thismod);
1064     }
1065     add_surface(st, oname, fp); /* read & store surface */
1066     return(1);
1067     }
1068     /* else skip arguments */
1069 greg 2.8 if (!fscanf(fp, "%d", &n)) return(0);
1070 greg 2.1 while (n-- > 0) fscanf(fp, "%*s");
1071 greg 2.10 if (!fscanf(fp, "%d", &n)) return(0);
1072 greg 2.1 while (n-- > 0) fscanf(fp, "%*d");
1073 greg 2.10 if (!fscanf(fp, "%d", &n)) return(0);
1074 greg 2.1 while (n-- > 0) fscanf(fp, "%*f");
1075     return(0);
1076     }
1077    
1078     /* Parse a sender object */
1079     static int
1080     add_send_object(FILE *fp)
1081     {
1082     int st;
1083     char otype[32], oname[128];
1084     int n;
1085    
1086     if (fscanf(fp, "%*s %s %s", otype, oname) != 2)
1087     return(0); /* must have hit EOF! */
1088     if (!strcmp(otype, "alias")) {
1089     fscanf(fp, "%*s"); /* skip alias */
1090     return(0);
1091     }
1092     /* is it a new surface? */
1093     if ((st = surf_type(otype)) != ST_NONE) {
1094     if (st == ST_SOURCE) {
1095     fputs(progname, stderr);
1096     fputs(": cannot use source as a sender!\n", stderr);
1097     return(-1);
1098     }
1099 greg 2.6 parse_params(&curparams, newparams);
1100     newparams[0] = '\0';
1101 greg 2.1 add_surface(st, oname, fp); /* read & store surface */
1102     return(0);
1103     }
1104     /* else skip arguments */
1105 greg 2.8 if (!fscanf(fp, "%d", &n)) return(0);
1106 greg 2.1 while (n-- > 0) fscanf(fp, "%*s");
1107 greg 2.10 if (!fscanf(fp, "%d", &n)) return(0);
1108 greg 2.1 while (n-- > 0) fscanf(fp, "%*d");
1109 greg 2.10 if (!fscanf(fp, "%d", &n)) return(0);
1110 greg 2.1 while (n-- > 0) fscanf(fp, "%*f");
1111     return(0);
1112     }
1113    
1114     /* Load a Radiance scene using the given callback function for objects */
1115     static int
1116     load_scene(const char *inspec, int (*ocb)(FILE *))
1117     {
1118     int rv = 0;
1119     char inpbuf[1024];
1120     FILE *fp;
1121     int c;
1122    
1123     if (*inspec == '!')
1124     fp = popen(inspec+1, "r");
1125     else
1126     fp = fopen(inspec, "r");
1127     if (fp == NULL) {
1128     fprintf(stderr, "%s: cannot load '%s'\n", progname, inspec);
1129     return(-1);
1130     }
1131     while ((c = getc(fp)) != EOF) { /* load receiver data */
1132     if (isspace(c)) /* skip leading white space */
1133     continue;
1134     if (c == '!') { /* read from a new command */
1135     inpbuf[0] = c;
1136     if (fgetline(inpbuf+1, sizeof(inpbuf)-1, fp) != NULL) {
1137     if ((c = load_scene(inpbuf, ocb)) < 0)
1138     return(c);
1139     rv += c;
1140     }
1141     continue;
1142     }
1143     if (c == '#') { /* parameters/comment */
1144 greg 2.5 if ((c = getc(fp)) == EOF || ungetc(c,fp) == EOF)
1145     break;
1146     if (!isspace(c) && fscanf(fp, "%s", inpbuf) == 1 &&
1147 greg 2.1 !strcmp(inpbuf, PARAMSTART)) {
1148     if (fgets(inpbuf, sizeof(inpbuf), fp) != NULL)
1149 greg 2.6 strcat(newparams, inpbuf);
1150 greg 2.1 continue;
1151     }
1152 greg 2.10 while ((c = getc(fp)) != EOF && c != '\n')
1153 greg 2.1 ; /* else skipping comment */
1154     continue;
1155     }
1156     ungetc(c, fp); /* else check object for receiver */
1157     c = (*ocb)(fp);
1158     if (c < 0)
1159     return(c);
1160     rv += c;
1161     }
1162     /* close our input stream */
1163     c = (*inspec == '!') ? pclose(fp) : fclose(fp);
1164     if (c != 0) {
1165     fprintf(stderr, "%s: error loading '%s'\n", progname, inspec);
1166     return(-1);
1167     }
1168     return(rv);
1169     }
1170    
1171     /* Get command arguments and run program */
1172     int
1173     main(int argc, char *argv[])
1174     {
1175     char fmtopt[6] = "-faa"; /* default output is ASCII */
1176 greg 2.4 char *xrs=NULL, *yrs=NULL, *ldopt=NULL;
1177 greg 2.11 char *iropt = NULL;
1178 greg 2.1 char *sendfn;
1179     char sampcntbuf[32], nsbinbuf[32];
1180     FILE *rcfp;
1181     int nsbins;
1182     int a, i;
1183     /* screen rcontrib options */
1184     progname = argv[0];
1185 greg 2.14 for (a = 1; a < argc-2; a++) {
1186     int na;
1187     /* check for argument expansion */
1188     while ((na = expandarg(&argc, &argv, a)) > 0)
1189     ;
1190     if (na < 0) {
1191     fprintf(stderr, "%s: cannot expand '%s'\n",
1192     progname, argv[a]);
1193     return(1);
1194     }
1195     if (argv[a][0] != '-' || !argv[a][1])
1196     break;
1197     na = 1;
1198     switch (argv[a][1]) { /* !! Keep consistent !! */
1199 greg 2.1 case 'v': /* verbose mode */
1200 greg 2.16 verbose = 1;
1201 greg 2.1 na = 0;
1202     continue;
1203     case 'f': /* special case for -fo, -ff, etc. */
1204     switch (argv[a][2]) {
1205     case '\0': /* cal file */
1206     goto userr;
1207     case 'o': /* force output */
1208     goto userr;
1209     case 'a': /* output format */
1210     case 'f':
1211     case 'd':
1212     case 'c':
1213 greg 2.6 if (!(fmtopt[3] = argv[a][3]))
1214     fmtopt[3] = argv[a][2];
1215     fmtopt[2] = argv[a][2];
1216 greg 2.1 na = 0;
1217     continue; /* will pass later */
1218     default:
1219     goto userr;
1220     }
1221     break;
1222 greg 2.4 case 'x': /* x-resolution */
1223     xrs = argv[++a];
1224     na = 0;
1225     continue;
1226     case 'y': /* y-resolution */
1227     yrs = argv[++a];
1228     na = 0;
1229     continue;
1230 greg 2.1 case 'c': /* number of samples */
1231 greg 2.6 sampcnt = atoi(argv[++a]);
1232 greg 2.1 if (sampcnt <= 0)
1233     goto userr;
1234     na = 0; /* we re-add this later */
1235     continue;
1236 greg 2.8 case 'I': /* only for pass-through mode */
1237 greg 2.11 case 'i':
1238     iropt = argv[a];
1239 greg 2.8 na = 0;
1240     continue;
1241 greg 2.16 case 'w': /* options without arguments */
1242     if (argv[a][2] != '+') verbose = -1;
1243     case 'V':
1244 greg 2.1 case 'u':
1245     case 'h':
1246 greg 2.4 case 'r':
1247 greg 2.1 break;
1248     case 'n': /* options with 1 argument */
1249     case 's':
1250     case 'o':
1251     na = 2;
1252     break;
1253     case 'b': /* special case */
1254     if (argv[a][2] != 'v') goto userr;
1255     break;
1256     case 'l': /* special case */
1257 greg 2.4 if (argv[a][2] == 'd') {
1258     ldopt = argv[a];
1259     na = 0;
1260     continue;
1261     }
1262 greg 2.1 na = 2;
1263     break;
1264     case 'd': /* special case */
1265     if (argv[a][2] != 'v') na = 2;
1266     break;
1267     case 'a': /* special case */
1268     na = (argv[a][2] == 'v') ? 4 : 2;
1269     break;
1270     case 'm': /* special case */
1271     if (!argv[a][2]) goto userr;
1272     na = (argv[a][2] == 'e') | (argv[a][2] == 'a') ? 4 : 2;
1273     break;
1274     default: /* anything else is verbotten */
1275     goto userr;
1276     }
1277     if (na <= 0) continue;
1278     CHECKARGC(na); /* pass on option */
1279     rcarg[nrcargs++] = argv[a];
1280     while (--na) /* + arguments if any */
1281     rcarg[nrcargs++] = argv[++a];
1282     }
1283     if (a > argc-2)
1284     goto userr; /* check at end of options */
1285     sendfn = argv[a++]; /* assign sender & receiver inputs */
1286     if (sendfn[0] == '-') { /* user wants pass-through mode? */
1287     if (sendfn[1]) goto userr;
1288     sendfn = NULL;
1289 greg 2.11 if (iropt) {
1290 greg 2.8 CHECKARGC(1);
1291 greg 2.11 rcarg[nrcargs++] = iropt;
1292 greg 2.8 }
1293 greg 2.4 if (xrs) {
1294     CHECKARGC(2);
1295     rcarg[nrcargs++] = "-x";
1296     rcarg[nrcargs++] = xrs;
1297     }
1298     if (yrs) {
1299     CHECKARGC(2);
1300     rcarg[nrcargs++] = "-y";
1301     rcarg[nrcargs++] = yrs;
1302     }
1303     if (ldopt) {
1304     CHECKARGC(1);
1305     rcarg[nrcargs++] = ldopt;
1306     }
1307 greg 2.1 if (sampcnt <= 0) sampcnt = 1;
1308 greg 2.8 } else { /* else in sampling mode */
1309 greg 2.11 if (iropt) {
1310 greg 2.8 fputs(progname, stderr);
1311 greg 2.11 fputs(": -i, -I supported for pass-through only\n", stderr);
1312 greg 2.8 return(1);
1313     }
1314 greg 2.6 fmtopt[2] = (sizeof(RREAL)==sizeof(double)) ? 'd' : 'f';
1315 greg 2.1 if (sampcnt <= 0) sampcnt = 10000;
1316     }
1317     sprintf(sampcntbuf, "%d", sampcnt);
1318     CHECKARGC(3); /* add our format & sample count */
1319     rcarg[nrcargs++] = fmtopt;
1320     rcarg[nrcargs++] = "-c";
1321     rcarg[nrcargs++] = sampcntbuf;
1322     /* add receiver arguments to rcontrib */
1323     if (load_scene(argv[a], add_recv_object) < 0)
1324     return(1);
1325     finish_receiver();
1326     if (sendfn == NULL) { /* pass-through mode? */
1327     CHECKARGC(1); /* add octree */
1328     rcarg[nrcargs++] = oconv_command(argc-a, argv+a);
1329     rcarg[nrcargs] = NULL;
1330     return(my_exec(rcarg)); /* rcontrib does everything */
1331     }
1332     clear_params(&curparams, 0); /* else load sender surface & params */
1333     if (load_scene(sendfn, add_send_object) < 0)
1334     return(1);
1335     if ((nsbins = prepare_sampler()) <= 0)
1336     return(1);
1337     CHECKARGC(3); /* add row count and octree */
1338     rcarg[nrcargs++] = "-y";
1339     sprintf(nsbinbuf, "%d", nsbins);
1340     rcarg[nrcargs++] = nsbinbuf;
1341     rcarg[nrcargs++] = oconv_command(argc-a, argv+a);
1342     rcarg[nrcargs] = NULL;
1343     /* open pipe to rcontrib process */
1344     if ((rcfp = popen_arglist(rcarg, "w")) == NULL)
1345     return(1);
1346     SET_FILE_BINARY(rcfp);
1347     #ifdef getc_unlocked
1348     flockfile(rcfp);
1349     #endif
1350     if (verbose) {
1351     fprintf(stderr, "%s: sampling %d directions", progname, nsbins);
1352     if (curparams.nsurfs > 1)
1353 greg 2.7 fprintf(stderr, " (%d elements)\n", curparams.nsurfs);
1354 greg 2.1 else
1355     fputc('\n', stderr);
1356     }
1357     for (i = 0; i < nsbins; i++) /* send rcontrib ray samples */
1358     if (!(*curparams.sample_basis)(&curparams, i, rcfp))
1359     return(1);
1360     return(pclose(rcfp) == 0); /* all finished! */
1361     userr:
1362     if (a < argc-2)
1363     fprintf(stderr, "%s: unsupported option '%s'", progname, argv[a]);
1364 greg 2.13 fprintf(stderr, "Usage: %s [-v][rcontrib options] sender.rad receiver.rad [-i system.oct] [system.rad ..]\n",
1365 greg 2.1 progname);
1366     return(1);
1367     }