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root/radiance/ray/src/cv/rad2mgf.c
Revision: 2.15
Committed: Wed Oct 14 14:48:04 1998 UTC (25 years, 5 months ago) by gwlarson
Content type: text/plain
Branch: MAIN
Changes since 2.14: +7 -2 lines
Log Message:
changed o_face() to put out multiple, escaped lines for big faces

File Contents

# User Rev Content
1 greg 2.12 /* Copyright (c) 1995 Regents of the University of California */
2 greg 2.1
3     #ifndef lint
4     static char SCCSid[] = "$SunId$ LBL";
5     #endif
6    
7     /*
8     * Convert Radiance scene description to MGF
9     */
10    
11 gwlarson 2.14 #include "standard.h"
12 greg 2.12 #include <ctype.h>
13 greg 2.1 #include <string.h>
14     #include "object.h"
15     #include "color.h"
16     #include "lookup.h"
17    
18 greg 2.10 #define C_1SIDEDTHICK 0.005
19    
20 greg 2.1 int o_face(), o_cone(), o_sphere(), o_ring(), o_cylinder();
21 greg 2.11 int o_instance(), o_illum();
22 greg 2.10 int o_plastic(), o_metal(), o_glass(), o_dielectric(),
23 greg 2.11 o_mirror(), o_trans(), o_light();
24 greg 2.1
25 gwlarson 2.14 extern int free();
26 greg 2.1
27     LUTAB rmats = LU_SINIT(free,NULL); /* defined material table */
28    
29     LUTAB rdispatch = LU_SINIT(NULL,NULL); /* function dispatch table */
30    
31 greg 2.2 char curmat[80]; /* current material */
32     char curobj[128] = "Untitled"; /* current object name */
33 greg 2.1
34 greg 2.2 double unit_mult = 1.; /* units multiplier */
35 greg 2.1
36 greg 2.2 #define hasmult (unit_mult < .999 || unit_mult > 1.001)
37 greg 2.1
38 greg 2.4 /*
39     * Stuff for tracking and reusing vertices:
40     */
41 greg 2.2
42 greg 2.9 char VKFMT[] = "%+16.9e %+16.9e %+16.9e";
43 greg 2.4 #define VKLEN 64
44    
45     #define mkvkey(k,v) sprintf(k, VKFMT, (v)[0], (v)[1], (v)[2])
46    
47     #define NVERTS 256
48    
49 greg 2.8 long vclock; /* incremented at each vertex request */
50 greg 2.4
51     struct vert {
52     long lused; /* when last used (0 if unassigned) */
53     FVECT p; /* track point position only */
54     } vert[NVERTS]; /* our vertex cache */
55    
56     LUTAB vertab = LU_SINIT(free,NULL); /* our vertex lookup table */
57    
58    
59 greg 2.1 main(argc, argv)
60     int argc;
61     char **argv;
62     {
63     int i;
64    
65     for (i = 1; i < argc && argv[i][0] == '-'; i++)
66     switch (argv[i][1]) {
67     case 'd': /* units */
68     switch (argv[i][2]) {
69     case 'm': /* meters */
70     unit_mult = 1.;
71     break;
72     case 'c': /* centimeters */
73     unit_mult = .01;
74     break;
75     case 'f': /* feet */
76     unit_mult = 12.*.0254;
77     break;
78     case 'i': /* inches */
79     unit_mult = .0254;
80     break;
81     default:
82     goto unkopt;
83     }
84     break;
85 greg 2.6 default:
86     goto unkopt;
87 greg 2.1 }
88     init();
89     if (i >= argc)
90     rad2mgf(NULL);
91     else
92     for ( ; i < argc; i++)
93     rad2mgf(argv[i]);
94     uninit();
95     exit(0);
96     unkopt:
97     fprintf(stderr, "Usage: %s [-d{m|c|f|i}] file ..\n", argv[0]);
98     exit(1);
99     }
100    
101    
102     rad2mgf(inp) /* convert a Radiance file to MGF */
103     char *inp;
104     {
105     #define mod buf
106     #define typ (buf+128)
107     #define id (buf+256)
108     #define alias (buf+384)
109     char buf[512];
110     FUNARGS fa;
111     register FILE *fp;
112     register int c;
113    
114     if (inp == NULL) {
115 greg 2.2 inp = "standard input";
116 greg 2.1 fp = stdin;
117     } else if (inp[0] == '!') {
118     if ((fp = popen(inp+1, "r")) == NULL) {
119     fputs(inp, stderr);
120     fputs(": cannot execute\n", stderr);
121     exit(1);
122     }
123     } else if ((fp = fopen(inp, "r")) == NULL) {
124     fputs(inp, stderr);
125     fputs(": cannot open\n", stderr);
126     exit(1);
127     }
128     printf("# Begin conversion from: %s\n", inp);
129     while ((c = getc(fp)) != EOF)
130     switch (c) {
131     case ' ': /* white space */
132     case '\t':
133     case '\n':
134     case '\r':
135     case '\f':
136     break;
137     case '#': /* comment */
138     if (fgets(buf, sizeof(buf), fp) != NULL)
139     printf("# %s", buf);
140     break;
141     case '!': /* inline command */
142     ungetc(c, fp);
143     fgetline(buf, sizeof(buf), fp);
144     rad2mgf(buf);
145     break;
146     default: /* Radiance primitive */
147     ungetc(c, fp);
148     if (fscanf(fp, "%s %s %s", mod, typ, id) != 3) {
149     fputs(inp, stderr);
150     fputs(": unexpected EOF\n", stderr);
151     exit(1);
152     }
153     if (!strcmp(typ, "alias")) {
154     strcpy(alias, "EOF");
155     fscanf(fp, "%s", alias);
156     newmat(id, alias);
157     } else {
158     if (!readfargs(&fa, fp)) {
159     fprintf(stderr,
160     "%s: bad argument syntax for %s \"%s\"\n",
161     inp, typ, id);
162     exit(1);
163     }
164     cvtprim(inp, mod, typ, id, &fa);
165     freefargs(&fa);
166     }
167     break;
168     }
169     printf("# End conversion from: %s\n", inp);
170     if (inp[0] == '!')
171     pclose(fp);
172     else
173     fclose(fp);
174     #undef mod
175     #undef typ
176     #undef id
177     #undef alias
178     }
179    
180    
181     cvtprim(inp, mod, typ, id, fa) /* process Radiance primitive */
182     char *inp, *mod, *typ, *id;
183     FUNARGS *fa;
184     {
185     int (*df)();
186    
187     df = (int (*)())lu_find(&rdispatch, typ)->data;
188     if (df != NULL) { /* convert */
189     if ((*df)(mod, typ, id, fa) < 0) {
190     fprintf(stderr, "%s: bad %s \"%s\"\n", typ, id);
191     exit(1);
192     }
193 greg 2.11 } else { /* unsupported */
194     o_unsupported(mod, typ, id, fa);
195     if (lu_find(&rmats, mod)->data != NULL) /* make alias */
196     newmat(id, mod);
197     }
198 greg 2.1 }
199    
200    
201     newmat(id, alias) /* add a modifier to the alias list */
202     char *id;
203     char *alias;
204     {
205     register LUENT *lp, *lpa;
206    
207     if (alias != NULL) { /* look up alias */
208     if ((lpa = lu_find(&rmats, alias)) == NULL)
209     goto memerr;
210     if (lpa->data == NULL)
211     alias = NULL; /* doesn't exist! */
212     }
213     if ((lp = lu_find(&rmats, id)) == NULL) /* look up material */
214     goto memerr;
215     if (alias != NULL && lp->data == lpa->key)
216     return; /* alias set already */
217     if (lp->data == NULL) { /* allocate material */
218     if ((lp->key = (char *)malloc(strlen(id)+1)) == NULL)
219     goto memerr;
220     strcpy(lp->key, id);
221     }
222     if (alias == NULL) { /* set this material */
223     lp->data = lp->key;
224     printf("m %s =\n", id);
225     } else { /* set this alias */
226     lp->data = lpa->key;
227     printf("m %s = %s\n", id, alias);
228     }
229     strcpy(curmat, id);
230     return;
231     memerr:
232     fputs("Out of memory in newmat!\n", stderr);
233     exit(1);
234     }
235    
236    
237     setmat(id) /* set material to this one */
238     char *id;
239     {
240     if (!strcmp(id, curmat)) /* already set? */
241     return;
242 greg 2.2 if (!strcmp(id, VOIDID)) /* cannot set */
243     return;
244 greg 2.1 printf("m %s\n", id);
245     strcpy(curmat, id);
246     }
247    
248    
249 greg 2.2 setobj(id) /* set object name to this one */
250     char *id;
251     {
252     register char *cp, *cp2;
253     char *end = NULL;
254     int diff = 0;
255     /* use all but final suffix */
256     for (cp = id; *cp; cp++)
257     if (*cp == '.')
258     end = cp;
259     if (end == NULL)
260     end = cp;
261     /* copy to current object */
262 greg 2.12 cp2 = curobj;
263     if (!isalpha(*id)) { /* start with letter */
264     diff = *cp2 != 'O';
265     *cp2++ = 'O';
266     }
267     for (cp = id; cp < end; *cp2++ = *cp++) {
268     if (*cp < '!' | *cp > '~') /* limit to visible chars */
269     *cp = '?';
270 greg 2.2 diff += *cp != *cp2;
271 greg 2.12 }
272 greg 2.2 if (!diff && !*cp2)
273     return;
274     *cp2 = '\0';
275     fputs("o\no ", stdout);
276     puts(curobj);
277     }
278    
279    
280 greg 2.1 init() /* initialize dispatch table and output */
281     {
282 greg 2.4 lu_init(&vertab, NVERTS);
283 greg 2.1 lu_init(&rdispatch, 22);
284     add2dispatch("polygon", o_face);
285     add2dispatch("cone", o_cone);
286     add2dispatch("cup", o_cone);
287     add2dispatch("sphere", o_sphere);
288     add2dispatch("bubble", o_sphere);
289     add2dispatch("cylinder", o_cylinder);
290     add2dispatch("tube", o_cylinder);
291     add2dispatch("ring", o_ring);
292     add2dispatch("instance", o_instance);
293     add2dispatch("plastic", o_plastic);
294     add2dispatch("plastic2", o_plastic);
295     add2dispatch("metal", o_metal);
296     add2dispatch("metal2", o_metal);
297     add2dispatch("glass", o_glass);
298 greg 2.10 add2dispatch("dielectric", o_dielectric);
299 greg 2.1 add2dispatch("trans", o_trans);
300     add2dispatch("trans2", o_trans);
301     add2dispatch("mirror", o_mirror);
302     add2dispatch("light", o_light);
303     add2dispatch("spotlight", o_light);
304     add2dispatch("glow", o_light);
305     add2dispatch("illum", o_illum);
306 greg 2.11 puts("# The following was converted from RADIANCE scene input");
307 greg 2.2 if (hasmult)
308 greg 2.1 printf("xf -s %.4e\n", unit_mult);
309 greg 2.2 printf("o %s\n", curobj);
310 greg 2.1 }
311    
312    
313     uninit() /* mark end of MGF file */
314     {
315 greg 2.2 puts("o");
316     if (hasmult)
317 greg 2.1 puts("xf");
318 greg 2.11 puts("# End of data converted from RADIANCE scene input");
319 greg 2.1 lu_done(&rdispatch);
320     lu_done(&rmats);
321 greg 2.4 lu_done(&vertab);
322 greg 2.1 }
323    
324    
325 greg 2.5 clrverts() /* clear vertex table */
326     {
327     register int i;
328    
329     lu_done(&vertab);
330     for (i = 0; i < NVERTS; i++)
331     vert[i].lused = 0;
332     lu_init(&vertab, NVERTS);
333     }
334    
335    
336 greg 2.1 add2dispatch(name, func) /* add function to dispatch table */
337     char *name;
338     int (*func)();
339     {
340     register LUENT *lp;
341    
342     lp = lu_find(&rdispatch, name);
343     if (lp->key != NULL) {
344     fputs(name, stderr);
345     fputs(": duplicate dispatch entry!\n", stderr);
346     exit(1);
347     }
348     lp->key = name;
349     lp->data = (char *)func;
350     }
351    
352    
353     char *
354 greg 2.2 getvertid(vname, vp) /* get/set vertex ID for this point */
355     char *vname;
356 greg 2.1 FVECT vp;
357     {
358 greg 2.9 static char vkey[VKLEN];
359 greg 2.1 register LUENT *lp;
360     register int i, vndx;
361    
362 greg 2.8 vclock++; /* increment counter */
363 greg 2.1 mkvkey(vkey, vp);
364     if ((lp = lu_find(&vertab, vkey)) == NULL)
365     goto memerr;
366     if (lp->data == NULL) { /* allocate new vertex entry */
367     if (lp->key != NULL) /* reclaim deleted entry */
368     vertab.ndel--;
369     else {
370     if ((lp->key = (char *)malloc(VKLEN)) == NULL)
371     goto memerr;
372     strcpy(lp->key, vkey);
373     }
374     vndx = 0; /* find oldest vertex */
375     for (i = 1; i < NVERTS; i++)
376     if (vert[i].lused < vert[vndx].lused)
377     vndx = i;
378     if (vert[vndx].lused) { /* free old entry first */
379     mkvkey(vkey, vert[vndx].p);
380     lu_delete(&vertab, vkey);
381     }
382 greg 2.3 VCOPY(vert[vndx].p, vp); /* assign it */
383 greg 2.2 printf("v v%d =\n\tp %.15g %.15g %.15g\n", /* print it */
384 greg 2.1 vndx, vp[0], vp[1], vp[2]);
385     lp->data = (char *)&vert[vndx]; /* set it */
386     } else
387     vndx = (struct vert *)lp->data - vert;
388 greg 2.8 vert[vndx].lused = vclock; /* record this use */
389 greg 2.1 sprintf(vname, "v%d", vndx);
390     return(vname);
391     memerr:
392     fputs("Out of memory in getvertid!\n", stderr);
393     exit(1);
394     }
395    
396    
397     int
398 greg 2.11 o_unsupported(mod, typ, id, fa) /* mark unsupported primitive */
399     char *mod, *typ, *id;
400     FUNARGS *fa;
401     {
402     register int i;
403    
404     fputs("\n# Unsupported RADIANCE primitive:\n", stdout);
405     printf("# %s %s %s", mod, typ, id);
406     printf("\n# %d", fa->nsargs);
407     for (i = 0; i < fa->nsargs; i++)
408     printf(" %s", fa->sarg[i]);
409     #ifdef IARGS
410     printf("\n# %d", fa->niargs);
411     for (i = 0; i < fa->niargs; i++)
412     printf(" %ld", fa->iarg[i]);
413     #else
414     fputs("\n# 0", stdout);
415     #endif
416     printf("\n# %d", fa->nfargs);
417     for (i = 0; i < fa->nfargs; i++)
418     printf(" %g", fa->farg[i]);
419     fputs("\n\n", stdout);
420     return(0);
421     }
422    
423    
424     int
425 greg 2.1 o_face(mod, typ, id, fa) /* print out a polygon */
426     char *mod, *typ, *id;
427     FUNARGS *fa;
428     {
429 gwlarson 2.15 char entbuf[2048], *linestart;
430 greg 2.2 register char *cp;
431 greg 2.1 register int i;
432    
433     if (fa->nfargs < 9 | fa->nfargs % 3)
434     return(-1);
435     setmat(mod);
436 greg 2.2 setobj(id);
437 gwlarson 2.15 cp = linestart = entbuf;
438 greg 2.2 *cp++ = 'f';
439 greg 2.1 for (i = 0; i < fa->nfargs; i += 3) {
440 greg 2.2 *cp++ = ' ';
441 gwlarson 2.15 if (cp - linestart > 72) {
442     *cp++ = '\\'; *cp++ = '\n';
443     linestart = cp;
444     *cp++ = ' '; *cp++ = ' ';
445     }
446 greg 2.2 getvertid(cp, fa->farg + i);
447     while (*cp)
448     cp++;
449 greg 2.1 }
450     puts(entbuf);
451     return(0);
452     }
453    
454    
455     int
456     o_cone(mod, typ, id, fa) /* print out a cone */
457     char *mod, *typ, *id;
458     register FUNARGS *fa;
459     {
460 greg 2.2 char v1[6], v2[6];
461    
462 greg 2.1 if (fa->nfargs != 8)
463     return(-1);
464     setmat(mod);
465 greg 2.2 setobj(id);
466     getvertid(v1, fa->farg);
467     getvertid(v2, fa->farg + 3);
468 greg 2.1 if (typ[1] == 'u') /* cup -> inverted cone */
469 greg 2.2 printf("cone %s %.12g %s %.12g\n",
470     v1, -fa->farg[6], v2, -fa->farg[7]);
471 greg 2.1 else
472 greg 2.2 printf("cone %s %.12g %s %.12g\n",
473     v1, fa->farg[6], v2, fa->farg[7]);
474 greg 2.1 return(0);
475     }
476    
477    
478     int
479     o_sphere(mod, typ, id, fa) /* print out a sphere */
480     char *mod, *typ, *id;
481     register FUNARGS *fa;
482     {
483 greg 2.2 char cent[6];
484    
485 greg 2.1 if (fa->nfargs != 4)
486     return(-1);
487     setmat(mod);
488 greg 2.2 setobj(id);
489     printf("sph %s %.12g\n", getvertid(cent, fa->farg),
490     typ[0]=='b' ? -fa->farg[3] : fa->farg[3]);
491 greg 2.1 return(0);
492     }
493    
494    
495     int
496     o_cylinder(mod, typ, id, fa) /* print out a cylinder */
497     char *mod, *typ, *id;
498     register FUNARGS *fa;
499     {
500 greg 2.2 char v1[6], v2[6];
501    
502 greg 2.1 if (fa->nfargs != 7)
503     return(-1);
504     setmat(mod);
505 greg 2.2 setobj(id);
506     getvertid(v1, fa->farg);
507     getvertid(v2, fa->farg + 3);
508     printf("cyl %s %.12g %s\n", v1,
509     typ[0]=='t' ? -fa->farg[6] : fa->farg[6], v2);
510 greg 2.1 return(0);
511     }
512    
513    
514     int
515     o_ring(mod, typ, id, fa) /* print out a ring */
516     char *mod, *typ, *id;
517     register FUNARGS *fa;
518     {
519     if (fa->nfargs != 8)
520     return(-1);
521     setmat(mod);
522 greg 2.2 setobj(id);
523     printf("v cent =\n\tp %.12g %.12g %.12g\n",
524 greg 2.1 fa->farg[0], fa->farg[1], fa->farg[2]);
525 greg 2.2 printf("\tn %.12g %.12g %.12g\n",
526 greg 2.1 fa->farg[3], fa->farg[4], fa->farg[5]);
527     if (fa->farg[6] < fa->farg[7])
528     printf("ring cent %.12g %.12g\n",
529     fa->farg[6], fa->farg[7]);
530     else
531     printf("ring cent %.12g %.12g\n",
532     fa->farg[7], fa->farg[6]);
533     return(0);
534     }
535    
536    
537     int
538     o_instance(mod, typ, id, fa) /* convert an instance */
539     char *mod, *typ, *id;
540     FUNARGS *fa;
541     {
542 greg 2.2 register int i;
543     register char *cp;
544     char *start = NULL, *end = NULL;
545     /*
546     * We don't really know how to do this, so we just create
547     * a reference to an undefined MGF file and it's the user's
548     * responsibility to create this file and put the appropriate
549     * stuff into it.
550     */
551     if (fa->nsargs < 1)
552     return(-1);
553     setmat(mod); /* only works if surfaces are void */
554     setobj(id);
555     for (cp = fa->sarg[0]; *cp; cp++) /* construct MGF file name */
556     if (*cp == '/')
557     start = cp+1;
558     else if (*cp == '.')
559     end = cp;
560     if (start == NULL)
561     start = fa->sarg[0];
562     if (end == NULL || start >= end)
563     end = cp;
564     fputs("i ", stdout); /* print include entity */
565     for (cp = start; cp < end; cp++)
566     putchar(*cp);
567     fputs(".mgf", stdout); /* add MGF suffix */
568     for (i = 1; i < fa->nsargs; i++) { /* add transform */
569     putchar(' ');
570     fputs(fa->sarg[i], stdout);
571     }
572     putchar('\n');
573 greg 2.5 clrverts(); /* vertex id's no longer reliable */
574 greg 2.2 return(0);
575 greg 2.1 }
576    
577    
578     int
579     o_illum(mod, typ, id, fa) /* convert an illum material */
580     char *mod, *typ, *id;
581     FUNARGS *fa;
582     {
583     if (fa->nsargs == 1 && strcmp(fa->sarg[0], VOIDID)) {
584     newmat(id, fa->sarg[0]); /* just create alias */
585     return(0);
586     }
587     /* else create invisible material */
588     newmat(id, NULL);
589 greg 2.2 puts("\tts 1 0");
590 greg 2.1 return(0);
591     }
592    
593    
594     int
595     o_plastic(mod, typ, id, fa) /* convert a plastic material */
596     char *mod, *typ, *id;
597     register FUNARGS *fa;
598     {
599     COLOR cxyz, rrgb;
600     double d;
601    
602     if (fa->nfargs != (typ[7]=='2' ? 6 : 5))
603     return(-1);
604     newmat(id, NULL);
605     rrgb[0] = fa->farg[0]; rrgb[1] = fa->farg[1]; rrgb[2] = fa->farg[2];
606     rgb_cie(cxyz, rrgb);
607 greg 2.2 puts("\tc"); /* put diffuse component */
608 greg 2.1 d = cxyz[0] + cxyz[1] + cxyz[2];
609     if (d > FTINY)
610 greg 2.2 printf("\t\tcxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d);
611     printf("\trd %.4f\n", cxyz[1]*(1. - fa->farg[3]));
612     if (fa->farg[3] > FTINY) { /* put specular component */
613     puts("\tc");
614     printf("\trs %.4f %.4f\n", fa->farg[3],
615     typ[7]=='2' ? .5*(fa->farg[4] + fa->farg[5]) :
616     fa->farg[4]);
617     }
618 greg 2.1 return(0);
619     }
620    
621    
622     int
623     o_metal(mod, typ, id, fa) /* convert a metal material */
624     char *mod, *typ, *id;
625     register FUNARGS *fa;
626     {
627     COLOR cxyz, rrgb;
628     double d;
629    
630     if (fa->nfargs != (typ[5]=='2' ? 6 : 5))
631     return(-1);
632     newmat(id, NULL);
633     rrgb[0] = fa->farg[0]; rrgb[1] = fa->farg[1]; rrgb[2] = fa->farg[2];
634     rgb_cie(cxyz, rrgb);
635 greg 2.2 puts("\tc"); /* put diffuse component */
636 greg 2.1 d = cxyz[0] + cxyz[1] + cxyz[2];
637     if (d > FTINY)
638 greg 2.2 printf("\t\tcxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d);
639     printf("\trd %.4f\n", cxyz[1]*(1. - fa->farg[3]));
640 greg 2.1 /* put specular component */
641 greg 2.2 printf("\trs %.4f %.4f\n", cxyz[1]*fa->farg[3],
642 greg 2.1 typ[5]=='2' ? .5*(fa->farg[4] + fa->farg[5]) :
643     fa->farg[4]);
644     return(0);
645     }
646    
647    
648     int
649     o_glass(mod, typ, id, fa) /* convert a glass material */
650     char *mod, *typ, *id;
651     register FUNARGS *fa;
652     {
653     COLOR cxyz, rrgb, trgb;
654     double nrfr = 1.52, F, d;
655     register int i;
656    
657     if (fa->nfargs != 3 && fa->nfargs != 4)
658     return(-1);
659     newmat(id, NULL);
660     if (fa->nfargs == 4)
661     nrfr = fa->farg[3];
662 greg 2.10 printf("\tir %f 0\n", nrfr);
663 greg 2.1 F = (1. - nrfr)/(1. + nrfr); /* use normal incidence */
664     F *= F;
665     for (i = 0; i < 3; i++) {
666 greg 2.2 trgb[i] = fa->farg[i] * (1. - F)*(1. - F) /
667 greg 2.1 (1. - F*F*fa->farg[i]*fa->farg[i]);
668 greg 2.2 rrgb[i] = F * (1. + (1. - 2.*F)*fa->farg[i]) /
669     (1. - F*F*fa->farg[i]*fa->farg[i]);
670 greg 2.1 }
671     rgb_cie(cxyz, rrgb); /* put reflected component */
672 greg 2.2 puts("\tc");
673 greg 2.1 d = cxyz[0] + cxyz[1] + cxyz[2];
674     if (d > FTINY)
675 greg 2.2 printf("\t\tcxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d);
676     printf("\trs %.4f 0\n", cxyz[1]);
677 greg 2.10 rgb_cie(cxyz, trgb); /* put transmitted component */
678     puts("\tc");
679     d = cxyz[0] + cxyz[1] + cxyz[2];
680     if (d > FTINY)
681     printf("\t\tcxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d);
682     printf("\tts %.4f 0\n", cxyz[1]);
683     return(0);
684     }
685    
686    
687     int
688     o_dielectric(mod, typ, id, fa) /* convert a dielectric material */
689     char *mod, *typ, *id;
690     register FUNARGS *fa;
691     {
692     COLOR cxyz, trgb;
693     double F, d;
694     register int i;
695    
696     if (fa->nfargs != 5)
697     return(-1);
698     newmat(id, NULL);
699     F = (1. - fa->farg[3])/(1. + fa->farg[3]); /* normal incidence */
700     F *= F;
701     for (i = 0; i < 3; i++)
702     trgb[i] = (1. - F)*pow(fa->farg[i], C_1SIDEDTHICK/unit_mult);
703     printf("\tir %f 0\n", fa->farg[3]); /* put index of refraction */
704     printf("\tsides 1\n");
705     puts("\tc"); /* put reflected component */
706     printf("\trs %.4f 0\n", F);
707 greg 2.1 rgb_cie(cxyz, trgb); /* put transmitted component */
708 greg 2.2 puts("\tc");
709 greg 2.1 d = cxyz[0] + cxyz[1] + cxyz[2];
710     if (d > FTINY)
711 greg 2.2 printf("\t\tcxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d);
712     printf("\tts %.4f 0\n", cxyz[1]);
713 greg 2.1 return(0);
714     }
715    
716    
717     int
718     o_mirror(mod, typ, id, fa) /* convert a mirror material */
719     char *mod, *typ, *id;
720     register FUNARGS *fa;
721     {
722     COLOR cxyz, rrgb;
723     double d;
724    
725     if (fa->nsargs == 1) { /* use alternate material */
726     newmat(id, fa->sarg[0]);
727     return(0);
728     }
729     if (fa->nfargs != 3)
730     return(-1);
731     newmat(id, NULL);
732     rrgb[0] = fa->farg[0]; rrgb[1] = fa->farg[1]; rrgb[2] = fa->farg[2];
733     rgb_cie(cxyz, rrgb);
734 greg 2.2 puts("\tc"); /* put specular component */
735 greg 2.1 d = cxyz[0] + cxyz[1] + cxyz[2];
736     if (d > FTINY)
737 greg 2.2 printf("\t\tcxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d);
738     printf("\trs %.4f 0\n", cxyz[1]);
739 greg 2.1 return(0);
740     }
741    
742    
743     int
744     o_trans(mod, typ, id, fa) /* convert a trans material */
745     char *mod, *typ, *id;
746     register FUNARGS *fa;
747     {
748     COLOR cxyz, rrgb;
749     double rough, trans, tspec, d;
750    
751     if (typ[4] == '2') { /* trans2 */
752     if (fa->nfargs != 8)
753     return(-1);
754     rough = .5*(fa->farg[4] + fa->farg[5]);
755     trans = fa->farg[6];
756     tspec = fa->farg[7];
757     } else { /* trans */
758     if (fa->nfargs != 7)
759     return(-1);
760     rough = fa->farg[4];
761     trans = fa->farg[5];
762     tspec = fa->farg[6];
763     }
764     newmat(id, NULL);
765     rrgb[0] = fa->farg[0]; rrgb[1] = fa->farg[1]; rrgb[2] = fa->farg[2];
766     rgb_cie(cxyz, rrgb);
767 greg 2.2 puts("\tc"); /* put transmitted diffuse */
768 greg 2.1 d = cxyz[0] + cxyz[1] + cxyz[2];
769     if (d > FTINY)
770 greg 2.2 printf("\t\tcxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d);
771     printf("\ttd %.4f\n", cxyz[1]*trans*(1. - fa->farg[3])*(1. - tspec));
772 greg 2.1 /* put transmitted specular */
773 greg 2.2 printf("\tts %.4f %.4f\n", cxyz[1]*trans*tspec*(1. - fa->farg[3]), rough);
774 greg 2.1 /* put reflected diffuse */
775 greg 2.2 printf("\trd %.4f\n", cxyz[1]*(1. - fa->farg[3])*(1. - trans));
776     puts("\tc"); /* put reflected specular */
777     printf("\trs %.4f %.4f\n", fa->farg[3], rough);
778 greg 2.1 return(0);
779     }
780    
781    
782     int
783     o_light(mod, typ, id, fa) /* convert a light type */
784     char *mod, *typ, *id;
785     register FUNARGS *fa;
786     {
787     COLOR cxyz, rrgb;
788     double d;
789    
790     if (fa->nfargs < 3)
791     return(-1);
792     newmat(id, NULL);
793     rrgb[0] = fa->farg[0]; rrgb[1] = fa->farg[1]; rrgb[2] = fa->farg[2];
794     rgb_cie(cxyz, rrgb);
795     d = cxyz[0] + cxyz[1] + cxyz[2];
796 greg 2.2 puts("\tc");
797 greg 2.1 if (d > FTINY)
798 greg 2.2 printf("\t\tcxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d);
799 greg 2.7 printf("\ted %.4g\n", cxyz[1]*(PI*WHTEFFICACY));
800 greg 2.1 return(0);
801     }