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root/radiance/ray/src/cv/rad2mgf.c
Revision: 2.18
Committed: Sun Jul 27 22:12:02 2003 UTC (20 years, 8 months ago) by schorsch
Content type: text/plain
Branch: MAIN
Changes since 2.17: +3 -3 lines
Log Message:
Added grouping parens to reduce ambiguity warnings.

File Contents

# Content
1 #ifndef lint
2 static const char RCSid[] = "$Id: rad2mgf.c,v 2.17 2003/06/08 12:03:09 schorsch Exp $";
3 #endif
4 /*
5 * Convert Radiance scene description to MGF
6 */
7
8 #include "standard.h"
9 #include <ctype.h>
10 #include <string.h>
11 #include <stdio.h>
12
13 #include "platform.h"
14 #include "object.h"
15 #include "color.h"
16 #include "lookup.h"
17
18 #define C_1SIDEDTHICK 0.005
19
20 int o_face(), o_cone(), o_sphere(), o_ring(), o_cylinder();
21 int o_instance(), o_illum();
22 int o_plastic(), o_metal(), o_glass(), o_dielectric(),
23 o_mirror(), o_trans(), o_light();
24
25 LUTAB rmats = LU_SINIT(free,NULL); /* defined material table */
26
27 LUTAB rdispatch = LU_SINIT(NULL,NULL); /* function dispatch table */
28
29 char curmat[80]; /* current material */
30 char curobj[128] = "Untitled"; /* current object name */
31
32 double unit_mult = 1.; /* units multiplier */
33
34 #define hasmult (unit_mult < .999 || unit_mult > 1.001)
35
36 /*
37 * Stuff for tracking and reusing vertices:
38 */
39
40 char VKFMT[] = "%+16.9e %+16.9e %+16.9e";
41 #define VKLEN 64
42
43 #define mkvkey(k,v) sprintf(k, VKFMT, (v)[0], (v)[1], (v)[2])
44
45 #define NVERTS 256
46
47 long vclock; /* incremented at each vertex request */
48
49 struct vert {
50 long lused; /* when last used (0 if unassigned) */
51 FVECT p; /* track point position only */
52 } vert[NVERTS]; /* our vertex cache */
53
54 LUTAB vertab = LU_SINIT(free,NULL); /* our vertex lookup table */
55
56
57 main(argc, argv)
58 int argc;
59 char **argv;
60 {
61 int i;
62
63 for (i = 1; i < argc && argv[i][0] == '-'; i++)
64 switch (argv[i][1]) {
65 case 'd': /* units */
66 switch (argv[i][2]) {
67 case 'm': /* meters */
68 unit_mult = 1.;
69 break;
70 case 'c': /* centimeters */
71 unit_mult = .01;
72 break;
73 case 'f': /* feet */
74 unit_mult = 12.*.0254;
75 break;
76 case 'i': /* inches */
77 unit_mult = .0254;
78 break;
79 default:
80 goto unkopt;
81 }
82 break;
83 default:
84 goto unkopt;
85 }
86 init();
87 if (i >= argc)
88 rad2mgf(NULL);
89 else
90 for ( ; i < argc; i++)
91 rad2mgf(argv[i]);
92 uninit();
93 exit(0);
94 unkopt:
95 fprintf(stderr, "Usage: %s [-d{m|c|f|i}] file ..\n", argv[0]);
96 exit(1);
97 }
98
99
100 rad2mgf(inp) /* convert a Radiance file to MGF */
101 char *inp;
102 {
103 #define mod buf
104 #define typ (buf+128)
105 #define id (buf+256)
106 #define alias (buf+384)
107 char buf[512];
108 FUNARGS fa;
109 register FILE *fp;
110 register int c;
111
112 if (inp == NULL) {
113 inp = "standard input";
114 fp = stdin;
115 } else if (inp[0] == '!') {
116 if ((fp = popen(inp+1, "r")) == NULL) {
117 fputs(inp, stderr);
118 fputs(": cannot execute\n", stderr);
119 exit(1);
120 }
121 } else if ((fp = fopen(inp, "r")) == NULL) {
122 fputs(inp, stderr);
123 fputs(": cannot open\n", stderr);
124 exit(1);
125 }
126 printf("# Begin conversion from: %s\n", inp);
127 while ((c = getc(fp)) != EOF)
128 switch (c) {
129 case ' ': /* white space */
130 case '\t':
131 case '\n':
132 case '\r':
133 case '\f':
134 break;
135 case '#': /* comment */
136 if (fgets(buf, sizeof(buf), fp) != NULL)
137 printf("# %s", buf);
138 break;
139 case '!': /* inline command */
140 ungetc(c, fp);
141 fgetline(buf, sizeof(buf), fp);
142 rad2mgf(buf);
143 break;
144 default: /* Radiance primitive */
145 ungetc(c, fp);
146 if (fscanf(fp, "%s %s %s", mod, typ, id) != 3) {
147 fputs(inp, stderr);
148 fputs(": unexpected EOF\n", stderr);
149 exit(1);
150 }
151 if (!strcmp(typ, "alias")) {
152 strcpy(alias, "EOF");
153 fscanf(fp, "%s", alias);
154 newmat(id, alias);
155 } else {
156 if (!readfargs(&fa, fp)) {
157 fprintf(stderr,
158 "%s: bad argument syntax for %s \"%s\"\n",
159 inp, typ, id);
160 exit(1);
161 }
162 cvtprim(inp, mod, typ, id, &fa);
163 freefargs(&fa);
164 }
165 break;
166 }
167 printf("# End conversion from: %s\n", inp);
168 if (inp[0] == '!')
169 pclose(fp);
170 else
171 fclose(fp);
172 #undef mod
173 #undef typ
174 #undef id
175 #undef alias
176 }
177
178
179 cvtprim(inp, mod, typ, id, fa) /* process Radiance primitive */
180 char *inp, *mod, *typ, *id;
181 FUNARGS *fa;
182 {
183 int (*df)();
184
185 df = (int (*)())lu_find(&rdispatch, typ)->data;
186 if (df != NULL) { /* convert */
187 if ((*df)(mod, typ, id, fa) < 0) {
188 fprintf(stderr, "%s: bad %s \"%s\"\n", typ, id);
189 exit(1);
190 }
191 } else { /* unsupported */
192 o_unsupported(mod, typ, id, fa);
193 if (lu_find(&rmats, mod)->data != NULL) /* make alias */
194 newmat(id, mod);
195 }
196 }
197
198
199 newmat(id, alias) /* add a modifier to the alias list */
200 char *id;
201 char *alias;
202 {
203 register LUENT *lp, *lpa;
204
205 if (alias != NULL) { /* look up alias */
206 if ((lpa = lu_find(&rmats, alias)) == NULL)
207 goto memerr;
208 if (lpa->data == NULL)
209 alias = NULL; /* doesn't exist! */
210 }
211 if ((lp = lu_find(&rmats, id)) == NULL) /* look up material */
212 goto memerr;
213 if (alias != NULL && lp->data == lpa->key)
214 return; /* alias set already */
215 if (lp->data == NULL) { /* allocate material */
216 if ((lp->key = (char *)malloc(strlen(id)+1)) == NULL)
217 goto memerr;
218 strcpy(lp->key, id);
219 }
220 if (alias == NULL) { /* set this material */
221 lp->data = lp->key;
222 printf("m %s =\n", id);
223 } else { /* set this alias */
224 lp->data = lpa->key;
225 printf("m %s = %s\n", id, alias);
226 }
227 strcpy(curmat, id);
228 return;
229 memerr:
230 fputs("Out of memory in newmat!\n", stderr);
231 exit(1);
232 }
233
234
235 setmat(id) /* set material to this one */
236 char *id;
237 {
238 if (!strcmp(id, curmat)) /* already set? */
239 return;
240 if (!strcmp(id, VOIDID)) /* cannot set */
241 return;
242 printf("m %s\n", id);
243 strcpy(curmat, id);
244 }
245
246
247 setobj(id) /* set object name to this one */
248 char *id;
249 {
250 register char *cp, *cp2;
251 char *end = NULL;
252 int diff = 0;
253 /* use all but final suffix */
254 for (cp = id; *cp; cp++)
255 if (*cp == '.')
256 end = cp;
257 if (end == NULL)
258 end = cp;
259 /* copy to current object */
260 cp2 = curobj;
261 if (!isalpha(*id)) { /* start with letter */
262 diff = *cp2 != 'O';
263 *cp2++ = 'O';
264 }
265 for (cp = id; cp < end; *cp2++ = *cp++) {
266 if ((*cp < '!') | (*cp > '~')) /* limit to visible chars */
267 *cp = '?';
268 diff += *cp != *cp2;
269 }
270 if (!diff && !*cp2)
271 return;
272 *cp2 = '\0';
273 fputs("o\no ", stdout);
274 puts(curobj);
275 }
276
277
278 init() /* initialize dispatch table and output */
279 {
280 lu_init(&vertab, NVERTS);
281 lu_init(&rdispatch, 22);
282 add2dispatch("polygon", o_face);
283 add2dispatch("cone", o_cone);
284 add2dispatch("cup", o_cone);
285 add2dispatch("sphere", o_sphere);
286 add2dispatch("bubble", o_sphere);
287 add2dispatch("cylinder", o_cylinder);
288 add2dispatch("tube", o_cylinder);
289 add2dispatch("ring", o_ring);
290 add2dispatch("instance", o_instance);
291 add2dispatch("plastic", o_plastic);
292 add2dispatch("plastic2", o_plastic);
293 add2dispatch("metal", o_metal);
294 add2dispatch("metal2", o_metal);
295 add2dispatch("glass", o_glass);
296 add2dispatch("dielectric", o_dielectric);
297 add2dispatch("trans", o_trans);
298 add2dispatch("trans2", o_trans);
299 add2dispatch("mirror", o_mirror);
300 add2dispatch("light", o_light);
301 add2dispatch("spotlight", o_light);
302 add2dispatch("glow", o_light);
303 add2dispatch("illum", o_illum);
304 puts("# The following was converted from RADIANCE scene input");
305 if (hasmult)
306 printf("xf -s %.4e\n", unit_mult);
307 printf("o %s\n", curobj);
308 }
309
310
311 uninit() /* mark end of MGF file */
312 {
313 puts("o");
314 if (hasmult)
315 puts("xf");
316 puts("# End of data converted from RADIANCE scene input");
317 lu_done(&rdispatch);
318 lu_done(&rmats);
319 lu_done(&vertab);
320 }
321
322
323 clrverts() /* clear vertex table */
324 {
325 register int i;
326
327 lu_done(&vertab);
328 for (i = 0; i < NVERTS; i++)
329 vert[i].lused = 0;
330 lu_init(&vertab, NVERTS);
331 }
332
333
334 add2dispatch(name, func) /* add function to dispatch table */
335 char *name;
336 int (*func)();
337 {
338 register LUENT *lp;
339
340 lp = lu_find(&rdispatch, name);
341 if (lp->key != NULL) {
342 fputs(name, stderr);
343 fputs(": duplicate dispatch entry!\n", stderr);
344 exit(1);
345 }
346 lp->key = name;
347 lp->data = (char *)func;
348 }
349
350
351 char *
352 getvertid(vname, vp) /* get/set vertex ID for this point */
353 char *vname;
354 FVECT vp;
355 {
356 static char vkey[VKLEN];
357 register LUENT *lp;
358 register int i, vndx;
359
360 vclock++; /* increment counter */
361 mkvkey(vkey, vp);
362 if ((lp = lu_find(&vertab, vkey)) == NULL)
363 goto memerr;
364 if (lp->data == NULL) { /* allocate new vertex entry */
365 if (lp->key != NULL) /* reclaim deleted entry */
366 vertab.ndel--;
367 else {
368 if ((lp->key = (char *)malloc(VKLEN)) == NULL)
369 goto memerr;
370 strcpy(lp->key, vkey);
371 }
372 vndx = 0; /* find oldest vertex */
373 for (i = 1; i < NVERTS; i++)
374 if (vert[i].lused < vert[vndx].lused)
375 vndx = i;
376 if (vert[vndx].lused) { /* free old entry first */
377 mkvkey(vkey, vert[vndx].p);
378 lu_delete(&vertab, vkey);
379 }
380 VCOPY(vert[vndx].p, vp); /* assign it */
381 printf("v v%d =\n\tp %.15g %.15g %.15g\n", /* print it */
382 vndx, vp[0], vp[1], vp[2]);
383 lp->data = (char *)&vert[vndx]; /* set it */
384 } else
385 vndx = (struct vert *)lp->data - vert;
386 vert[vndx].lused = vclock; /* record this use */
387 sprintf(vname, "v%d", vndx);
388 return(vname);
389 memerr:
390 fputs("Out of memory in getvertid!\n", stderr);
391 exit(1);
392 }
393
394
395 int
396 o_unsupported(mod, typ, id, fa) /* mark unsupported primitive */
397 char *mod, *typ, *id;
398 FUNARGS *fa;
399 {
400 register int i;
401
402 fputs("\n# Unsupported RADIANCE primitive:\n", stdout);
403 printf("# %s %s %s", mod, typ, id);
404 printf("\n# %d", fa->nsargs);
405 for (i = 0; i < fa->nsargs; i++)
406 printf(" %s", fa->sarg[i]);
407 #ifdef IARGS
408 printf("\n# %d", fa->niargs);
409 for (i = 0; i < fa->niargs; i++)
410 printf(" %ld", fa->iarg[i]);
411 #else
412 fputs("\n# 0", stdout);
413 #endif
414 printf("\n# %d", fa->nfargs);
415 for (i = 0; i < fa->nfargs; i++)
416 printf(" %g", fa->farg[i]);
417 fputs("\n\n", stdout);
418 return(0);
419 }
420
421
422 int
423 o_face(mod, typ, id, fa) /* print out a polygon */
424 char *mod, *typ, *id;
425 FUNARGS *fa;
426 {
427 char entbuf[2048], *linestart;
428 register char *cp;
429 register int i;
430
431 if ((fa->nfargs < 9) | (fa->nfargs % 3))
432 return(-1);
433 setmat(mod);
434 setobj(id);
435 cp = linestart = entbuf;
436 *cp++ = 'f';
437 for (i = 0; i < fa->nfargs; i += 3) {
438 *cp++ = ' ';
439 if (cp - linestart > 72) {
440 *cp++ = '\\'; *cp++ = '\n';
441 linestart = cp;
442 *cp++ = ' '; *cp++ = ' ';
443 }
444 getvertid(cp, fa->farg + i);
445 while (*cp)
446 cp++;
447 }
448 puts(entbuf);
449 return(0);
450 }
451
452
453 int
454 o_cone(mod, typ, id, fa) /* print out a cone */
455 char *mod, *typ, *id;
456 register FUNARGS *fa;
457 {
458 char v1[6], v2[6];
459
460 if (fa->nfargs != 8)
461 return(-1);
462 setmat(mod);
463 setobj(id);
464 getvertid(v1, fa->farg);
465 getvertid(v2, fa->farg + 3);
466 if (typ[1] == 'u') /* cup -> inverted cone */
467 printf("cone %s %.12g %s %.12g\n",
468 v1, -fa->farg[6], v2, -fa->farg[7]);
469 else
470 printf("cone %s %.12g %s %.12g\n",
471 v1, fa->farg[6], v2, fa->farg[7]);
472 return(0);
473 }
474
475
476 int
477 o_sphere(mod, typ, id, fa) /* print out a sphere */
478 char *mod, *typ, *id;
479 register FUNARGS *fa;
480 {
481 char cent[6];
482
483 if (fa->nfargs != 4)
484 return(-1);
485 setmat(mod);
486 setobj(id);
487 printf("sph %s %.12g\n", getvertid(cent, fa->farg),
488 typ[0]=='b' ? -fa->farg[3] : fa->farg[3]);
489 return(0);
490 }
491
492
493 int
494 o_cylinder(mod, typ, id, fa) /* print out a cylinder */
495 char *mod, *typ, *id;
496 register FUNARGS *fa;
497 {
498 char v1[6], v2[6];
499
500 if (fa->nfargs != 7)
501 return(-1);
502 setmat(mod);
503 setobj(id);
504 getvertid(v1, fa->farg);
505 getvertid(v2, fa->farg + 3);
506 printf("cyl %s %.12g %s\n", v1,
507 typ[0]=='t' ? -fa->farg[6] : fa->farg[6], v2);
508 return(0);
509 }
510
511
512 int
513 o_ring(mod, typ, id, fa) /* print out a ring */
514 char *mod, *typ, *id;
515 register FUNARGS *fa;
516 {
517 if (fa->nfargs != 8)
518 return(-1);
519 setmat(mod);
520 setobj(id);
521 printf("v cent =\n\tp %.12g %.12g %.12g\n",
522 fa->farg[0], fa->farg[1], fa->farg[2]);
523 printf("\tn %.12g %.12g %.12g\n",
524 fa->farg[3], fa->farg[4], fa->farg[5]);
525 if (fa->farg[6] < fa->farg[7])
526 printf("ring cent %.12g %.12g\n",
527 fa->farg[6], fa->farg[7]);
528 else
529 printf("ring cent %.12g %.12g\n",
530 fa->farg[7], fa->farg[6]);
531 return(0);
532 }
533
534
535 int
536 o_instance(mod, typ, id, fa) /* convert an instance */
537 char *mod, *typ, *id;
538 FUNARGS *fa;
539 {
540 register int i;
541 register char *cp;
542 char *start = NULL, *end = NULL;
543 /*
544 * We don't really know how to do this, so we just create
545 * a reference to an undefined MGF file and it's the user's
546 * responsibility to create this file and put the appropriate
547 * stuff into it.
548 */
549 if (fa->nsargs < 1)
550 return(-1);
551 setmat(mod); /* only works if surfaces are void */
552 setobj(id);
553 for (cp = fa->sarg[0]; *cp; cp++) /* construct MGF file name */
554 if (*cp == '/')
555 start = cp+1;
556 else if (*cp == '.')
557 end = cp;
558 if (start == NULL)
559 start = fa->sarg[0];
560 if (end == NULL || start >= end)
561 end = cp;
562 fputs("i ", stdout); /* print include entity */
563 for (cp = start; cp < end; cp++)
564 putchar(*cp);
565 fputs(".mgf", stdout); /* add MGF suffix */
566 for (i = 1; i < fa->nsargs; i++) { /* add transform */
567 putchar(' ');
568 fputs(fa->sarg[i], stdout);
569 }
570 putchar('\n');
571 clrverts(); /* vertex id's no longer reliable */
572 return(0);
573 }
574
575
576 int
577 o_illum(mod, typ, id, fa) /* convert an illum material */
578 char *mod, *typ, *id;
579 FUNARGS *fa;
580 {
581 if (fa->nsargs == 1 && strcmp(fa->sarg[0], VOIDID)) {
582 newmat(id, fa->sarg[0]); /* just create alias */
583 return(0);
584 }
585 /* else create invisible material */
586 newmat(id, NULL);
587 puts("\tts 1 0");
588 return(0);
589 }
590
591
592 int
593 o_plastic(mod, typ, id, fa) /* convert a plastic material */
594 char *mod, *typ, *id;
595 register FUNARGS *fa;
596 {
597 COLOR cxyz, rrgb;
598 double d;
599
600 if (fa->nfargs != (typ[7]=='2' ? 6 : 5))
601 return(-1);
602 newmat(id, NULL);
603 rrgb[0] = fa->farg[0]; rrgb[1] = fa->farg[1]; rrgb[2] = fa->farg[2];
604 rgb_cie(cxyz, rrgb);
605 puts("\tc"); /* put diffuse component */
606 d = cxyz[0] + cxyz[1] + cxyz[2];
607 if (d > FTINY)
608 printf("\t\tcxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d);
609 printf("\trd %.4f\n", cxyz[1]*(1. - fa->farg[3]));
610 if (fa->farg[3] > FTINY) { /* put specular component */
611 puts("\tc");
612 printf("\trs %.4f %.4f\n", fa->farg[3],
613 typ[7]=='2' ? .5*(fa->farg[4] + fa->farg[5]) :
614 fa->farg[4]);
615 }
616 return(0);
617 }
618
619
620 int
621 o_metal(mod, typ, id, fa) /* convert a metal material */
622 char *mod, *typ, *id;
623 register FUNARGS *fa;
624 {
625 COLOR cxyz, rrgb;
626 double d;
627
628 if (fa->nfargs != (typ[5]=='2' ? 6 : 5))
629 return(-1);
630 newmat(id, NULL);
631 rrgb[0] = fa->farg[0]; rrgb[1] = fa->farg[1]; rrgb[2] = fa->farg[2];
632 rgb_cie(cxyz, rrgb);
633 puts("\tc"); /* put diffuse component */
634 d = cxyz[0] + cxyz[1] + cxyz[2];
635 if (d > FTINY)
636 printf("\t\tcxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d);
637 printf("\trd %.4f\n", cxyz[1]*(1. - fa->farg[3]));
638 /* put specular component */
639 printf("\trs %.4f %.4f\n", cxyz[1]*fa->farg[3],
640 typ[5]=='2' ? .5*(fa->farg[4] + fa->farg[5]) :
641 fa->farg[4]);
642 return(0);
643 }
644
645
646 int
647 o_glass(mod, typ, id, fa) /* convert a glass material */
648 char *mod, *typ, *id;
649 register FUNARGS *fa;
650 {
651 COLOR cxyz, rrgb, trgb;
652 double nrfr = 1.52, F, d;
653 register int i;
654
655 if (fa->nfargs != 3 && fa->nfargs != 4)
656 return(-1);
657 newmat(id, NULL);
658 if (fa->nfargs == 4)
659 nrfr = fa->farg[3];
660 printf("\tir %f 0\n", nrfr);
661 F = (1. - nrfr)/(1. + nrfr); /* use normal incidence */
662 F *= F;
663 for (i = 0; i < 3; i++) {
664 trgb[i] = fa->farg[i] * (1. - F)*(1. - F) /
665 (1. - F*F*fa->farg[i]*fa->farg[i]);
666 rrgb[i] = F * (1. + (1. - 2.*F)*fa->farg[i]) /
667 (1. - F*F*fa->farg[i]*fa->farg[i]);
668 }
669 rgb_cie(cxyz, rrgb); /* put reflected component */
670 puts("\tc");
671 d = cxyz[0] + cxyz[1] + cxyz[2];
672 if (d > FTINY)
673 printf("\t\tcxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d);
674 printf("\trs %.4f 0\n", cxyz[1]);
675 rgb_cie(cxyz, trgb); /* put transmitted component */
676 puts("\tc");
677 d = cxyz[0] + cxyz[1] + cxyz[2];
678 if (d > FTINY)
679 printf("\t\tcxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d);
680 printf("\tts %.4f 0\n", cxyz[1]);
681 return(0);
682 }
683
684
685 int
686 o_dielectric(mod, typ, id, fa) /* convert a dielectric material */
687 char *mod, *typ, *id;
688 register FUNARGS *fa;
689 {
690 COLOR cxyz, trgb;
691 double F, d;
692 register int i;
693
694 if (fa->nfargs != 5)
695 return(-1);
696 newmat(id, NULL);
697 F = (1. - fa->farg[3])/(1. + fa->farg[3]); /* normal incidence */
698 F *= F;
699 for (i = 0; i < 3; i++)
700 trgb[i] = (1. - F)*pow(fa->farg[i], C_1SIDEDTHICK/unit_mult);
701 printf("\tir %f 0\n", fa->farg[3]); /* put index of refraction */
702 printf("\tsides 1\n");
703 puts("\tc"); /* put reflected component */
704 printf("\trs %.4f 0\n", F);
705 rgb_cie(cxyz, trgb); /* put transmitted component */
706 puts("\tc");
707 d = cxyz[0] + cxyz[1] + cxyz[2];
708 if (d > FTINY)
709 printf("\t\tcxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d);
710 printf("\tts %.4f 0\n", cxyz[1]);
711 return(0);
712 }
713
714
715 int
716 o_mirror(mod, typ, id, fa) /* convert a mirror material */
717 char *mod, *typ, *id;
718 register FUNARGS *fa;
719 {
720 COLOR cxyz, rrgb;
721 double d;
722
723 if (fa->nsargs == 1) { /* use alternate material */
724 newmat(id, fa->sarg[0]);
725 return(0);
726 }
727 if (fa->nfargs != 3)
728 return(-1);
729 newmat(id, NULL);
730 rrgb[0] = fa->farg[0]; rrgb[1] = fa->farg[1]; rrgb[2] = fa->farg[2];
731 rgb_cie(cxyz, rrgb);
732 puts("\tc"); /* put specular component */
733 d = cxyz[0] + cxyz[1] + cxyz[2];
734 if (d > FTINY)
735 printf("\t\tcxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d);
736 printf("\trs %.4f 0\n", cxyz[1]);
737 return(0);
738 }
739
740
741 int
742 o_trans(mod, typ, id, fa) /* convert a trans material */
743 char *mod, *typ, *id;
744 register FUNARGS *fa;
745 {
746 COLOR cxyz, rrgb;
747 double rough, trans, tspec, d;
748
749 if (typ[4] == '2') { /* trans2 */
750 if (fa->nfargs != 8)
751 return(-1);
752 rough = .5*(fa->farg[4] + fa->farg[5]);
753 trans = fa->farg[6];
754 tspec = fa->farg[7];
755 } else { /* trans */
756 if (fa->nfargs != 7)
757 return(-1);
758 rough = fa->farg[4];
759 trans = fa->farg[5];
760 tspec = fa->farg[6];
761 }
762 newmat(id, NULL);
763 rrgb[0] = fa->farg[0]; rrgb[1] = fa->farg[1]; rrgb[2] = fa->farg[2];
764 rgb_cie(cxyz, rrgb);
765 puts("\tc"); /* put transmitted diffuse */
766 d = cxyz[0] + cxyz[1] + cxyz[2];
767 if (d > FTINY)
768 printf("\t\tcxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d);
769 printf("\ttd %.4f\n", cxyz[1]*trans*(1. - fa->farg[3])*(1. - tspec));
770 /* put transmitted specular */
771 printf("\tts %.4f %.4f\n", cxyz[1]*trans*tspec*(1. - fa->farg[3]), rough);
772 /* put reflected diffuse */
773 printf("\trd %.4f\n", cxyz[1]*(1. - fa->farg[3])*(1. - trans));
774 puts("\tc"); /* put reflected specular */
775 printf("\trs %.4f %.4f\n", fa->farg[3], rough);
776 return(0);
777 }
778
779
780 int
781 o_light(mod, typ, id, fa) /* convert a light type */
782 char *mod, *typ, *id;
783 register FUNARGS *fa;
784 {
785 COLOR cxyz, rrgb;
786 double d;
787
788 if (fa->nfargs < 3)
789 return(-1);
790 newmat(id, NULL);
791 rrgb[0] = fa->farg[0]; rrgb[1] = fa->farg[1]; rrgb[2] = fa->farg[2];
792 rgb_cie(cxyz, rrgb);
793 d = cxyz[0] + cxyz[1] + cxyz[2];
794 puts("\tc");
795 if (d > FTINY)
796 printf("\t\tcxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d);
797 printf("\ted %.4g\n", cxyz[1]*(PI*WHTEFFICACY));
798 return(0);
799 }