| 1 |
/* Copyright (c) 1994 Regents of the University of California */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* Convert Radiance scene description to MGF |
| 9 |
*/ |
| 10 |
|
| 11 |
#include <stdio.h> |
| 12 |
#include <string.h> |
| 13 |
#include "fvect.h" |
| 14 |
#include "object.h" |
| 15 |
#include "color.h" |
| 16 |
#include "lookup.h" |
| 17 |
|
| 18 |
int o_face(), o_cone(), o_sphere(), o_ring(), o_cylinder(); |
| 19 |
int o_instance(), o_source(), o_illum(); |
| 20 |
int o_plastic(), o_metal(), o_glass(), o_mirror(), o_trans(), o_light(); |
| 21 |
|
| 22 |
extern void free(); |
| 23 |
extern char *malloc(); |
| 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 |
|
| 31 |
double unit_mult = 1.; /* units multiplier */ |
| 32 |
|
| 33 |
|
| 34 |
main(argc, argv) |
| 35 |
int argc; |
| 36 |
char **argv; |
| 37 |
{ |
| 38 |
int i; |
| 39 |
|
| 40 |
for (i = 1; i < argc && argv[i][0] == '-'; i++) |
| 41 |
switch (argv[i][1]) { |
| 42 |
case 'd': /* units */ |
| 43 |
switch (argv[i][2]) { |
| 44 |
case 'm': /* meters */ |
| 45 |
unit_mult = 1.; |
| 46 |
break; |
| 47 |
case 'c': /* centimeters */ |
| 48 |
unit_mult = .01; |
| 49 |
break; |
| 50 |
case 'f': /* feet */ |
| 51 |
unit_mult = 12.*.0254; |
| 52 |
break; |
| 53 |
case 'i': /* inches */ |
| 54 |
unit_mult = .0254; |
| 55 |
break; |
| 56 |
default: |
| 57 |
goto unkopt; |
| 58 |
} |
| 59 |
break; |
| 60 |
} |
| 61 |
init(); |
| 62 |
if (i >= argc) |
| 63 |
rad2mgf(NULL); |
| 64 |
else |
| 65 |
for ( ; i < argc; i++) |
| 66 |
rad2mgf(argv[i]); |
| 67 |
uninit(); |
| 68 |
exit(0); |
| 69 |
unkopt: |
| 70 |
fprintf(stderr, "Usage: %s [-d{m|c|f|i}] file ..\n", argv[0]); |
| 71 |
exit(1); |
| 72 |
} |
| 73 |
|
| 74 |
|
| 75 |
rad2mgf(inp) /* convert a Radiance file to MGF */ |
| 76 |
char *inp; |
| 77 |
{ |
| 78 |
#define mod buf |
| 79 |
#define typ (buf+128) |
| 80 |
#define id (buf+256) |
| 81 |
#define alias (buf+384) |
| 82 |
char buf[512]; |
| 83 |
FUNARGS fa; |
| 84 |
register FILE *fp; |
| 85 |
register int c; |
| 86 |
|
| 87 |
if (inp == NULL) { |
| 88 |
inp = "the standard input"; |
| 89 |
fp = stdin; |
| 90 |
} else if (inp[0] == '!') { |
| 91 |
if ((fp = popen(inp+1, "r")) == NULL) { |
| 92 |
fputs(inp, stderr); |
| 93 |
fputs(": cannot execute\n", stderr); |
| 94 |
exit(1); |
| 95 |
} |
| 96 |
} else if ((fp = fopen(inp, "r")) == NULL) { |
| 97 |
fputs(inp, stderr); |
| 98 |
fputs(": cannot open\n", stderr); |
| 99 |
exit(1); |
| 100 |
} |
| 101 |
printf("# Begin conversion from: %s\n", inp); |
| 102 |
while ((c = getc(fp)) != EOF) |
| 103 |
switch (c) { |
| 104 |
case ' ': /* white space */ |
| 105 |
case '\t': |
| 106 |
case '\n': |
| 107 |
case '\r': |
| 108 |
case '\f': |
| 109 |
break; |
| 110 |
case '#': /* comment */ |
| 111 |
if (fgets(buf, sizeof(buf), fp) != NULL) |
| 112 |
printf("# %s", buf); |
| 113 |
break; |
| 114 |
case '!': /* inline command */ |
| 115 |
ungetc(c, fp); |
| 116 |
fgetline(buf, sizeof(buf), fp); |
| 117 |
rad2mgf(buf); |
| 118 |
break; |
| 119 |
default: /* Radiance primitive */ |
| 120 |
ungetc(c, fp); |
| 121 |
if (fscanf(fp, "%s %s %s", mod, typ, id) != 3) { |
| 122 |
fputs(inp, stderr); |
| 123 |
fputs(": unexpected EOF\n", stderr); |
| 124 |
exit(1); |
| 125 |
} |
| 126 |
if (!strcmp(typ, "alias")) { |
| 127 |
strcpy(alias, "EOF"); |
| 128 |
fscanf(fp, "%s", alias); |
| 129 |
newmat(id, alias); |
| 130 |
} else { |
| 131 |
if (!readfargs(&fa, fp)) { |
| 132 |
fprintf(stderr, |
| 133 |
"%s: bad argument syntax for %s \"%s\"\n", |
| 134 |
inp, typ, id); |
| 135 |
exit(1); |
| 136 |
} |
| 137 |
cvtprim(inp, mod, typ, id, &fa); |
| 138 |
freefargs(&fa); |
| 139 |
} |
| 140 |
break; |
| 141 |
} |
| 142 |
printf("# End conversion from: %s\n", inp); |
| 143 |
if (inp[0] == '!') |
| 144 |
pclose(fp); |
| 145 |
else |
| 146 |
fclose(fp); |
| 147 |
#undef mod |
| 148 |
#undef typ |
| 149 |
#undef id |
| 150 |
#undef alias |
| 151 |
} |
| 152 |
|
| 153 |
|
| 154 |
cvtprim(inp, mod, typ, id, fa) /* process Radiance primitive */ |
| 155 |
char *inp, *mod, *typ, *id; |
| 156 |
FUNARGS *fa; |
| 157 |
{ |
| 158 |
int (*df)(); |
| 159 |
|
| 160 |
df = (int (*)())lu_find(&rdispatch, typ)->data; |
| 161 |
if (df != NULL) { /* convert */ |
| 162 |
if ((*df)(mod, typ, id, fa) < 0) { |
| 163 |
fprintf(stderr, "%s: bad %s \"%s\"\n", typ, id); |
| 164 |
exit(1); |
| 165 |
} |
| 166 |
} else if (lu_find(&rmats, mod)->data != NULL) /* make alias */ |
| 167 |
newmat(id, mod); |
| 168 |
} |
| 169 |
|
| 170 |
|
| 171 |
newmat(id, alias) /* add a modifier to the alias list */ |
| 172 |
char *id; |
| 173 |
char *alias; |
| 174 |
{ |
| 175 |
register LUENT *lp, *lpa; |
| 176 |
|
| 177 |
if (alias != NULL) { /* look up alias */ |
| 178 |
if ((lpa = lu_find(&rmats, alias)) == NULL) |
| 179 |
goto memerr; |
| 180 |
if (lpa->data == NULL) |
| 181 |
alias = NULL; /* doesn't exist! */ |
| 182 |
} |
| 183 |
if ((lp = lu_find(&rmats, id)) == NULL) /* look up material */ |
| 184 |
goto memerr; |
| 185 |
if (alias != NULL && lp->data == lpa->key) |
| 186 |
return; /* alias set already */ |
| 187 |
if (lp->data == NULL) { /* allocate material */ |
| 188 |
if ((lp->key = (char *)malloc(strlen(id)+1)) == NULL) |
| 189 |
goto memerr; |
| 190 |
strcpy(lp->key, id); |
| 191 |
} |
| 192 |
if (alias == NULL) { /* set this material */ |
| 193 |
lp->data = lp->key; |
| 194 |
printf("m %s =\n", id); |
| 195 |
} else { /* set this alias */ |
| 196 |
lp->data = lpa->key; |
| 197 |
printf("m %s = %s\n", id, alias); |
| 198 |
} |
| 199 |
strcpy(curmat, id); |
| 200 |
return; |
| 201 |
memerr: |
| 202 |
fputs("Out of memory in newmat!\n", stderr); |
| 203 |
exit(1); |
| 204 |
} |
| 205 |
|
| 206 |
|
| 207 |
setmat(id) /* set material to this one */ |
| 208 |
char *id; |
| 209 |
{ |
| 210 |
if (!strcmp(id, curmat)) /* already set? */ |
| 211 |
return; |
| 212 |
printf("m %s\n", id); |
| 213 |
strcpy(curmat, id); |
| 214 |
} |
| 215 |
|
| 216 |
|
| 217 |
init() /* initialize dispatch table and output */ |
| 218 |
{ |
| 219 |
lu_init(&rdispatch, 22); |
| 220 |
add2dispatch("polygon", o_face); |
| 221 |
add2dispatch("cone", o_cone); |
| 222 |
add2dispatch("cup", o_cone); |
| 223 |
add2dispatch("sphere", o_sphere); |
| 224 |
add2dispatch("bubble", o_sphere); |
| 225 |
add2dispatch("cylinder", o_cylinder); |
| 226 |
add2dispatch("tube", o_cylinder); |
| 227 |
add2dispatch("ring", o_ring); |
| 228 |
add2dispatch("instance", o_instance); |
| 229 |
add2dispatch("plastic", o_plastic); |
| 230 |
add2dispatch("plastic2", o_plastic); |
| 231 |
add2dispatch("metal", o_metal); |
| 232 |
add2dispatch("metal2", o_metal); |
| 233 |
add2dispatch("glass", o_glass); |
| 234 |
add2dispatch("trans", o_trans); |
| 235 |
add2dispatch("trans2", o_trans); |
| 236 |
add2dispatch("mirror", o_mirror); |
| 237 |
add2dispatch("light", o_light); |
| 238 |
add2dispatch("spotlight", o_light); |
| 239 |
add2dispatch("glow", o_light); |
| 240 |
add2dispatch("illum", o_illum); |
| 241 |
puts("# The following was converted from Radiance scene input"); |
| 242 |
if (unit_mult < .999 || unit_mult > 1.001) |
| 243 |
printf("xf -s %.4e\n", unit_mult); |
| 244 |
} |
| 245 |
|
| 246 |
|
| 247 |
uninit() /* mark end of MGF file */ |
| 248 |
{ |
| 249 |
if (unit_mult < .999 || unit_mult > 1.001) |
| 250 |
puts("xf"); |
| 251 |
puts("# End of data converted from Radiance scene input"); |
| 252 |
lu_done(&rdispatch); |
| 253 |
lu_done(&rmats); |
| 254 |
} |
| 255 |
|
| 256 |
|
| 257 |
add2dispatch(name, func) /* add function to dispatch table */ |
| 258 |
char *name; |
| 259 |
int (*func)(); |
| 260 |
{ |
| 261 |
register LUENT *lp; |
| 262 |
|
| 263 |
lp = lu_find(&rdispatch, name); |
| 264 |
if (lp->key != NULL) { |
| 265 |
fputs(name, stderr); |
| 266 |
fputs(": duplicate dispatch entry!\n", stderr); |
| 267 |
exit(1); |
| 268 |
} |
| 269 |
lp->key = name; |
| 270 |
lp->data = (char *)func; |
| 271 |
} |
| 272 |
|
| 273 |
|
| 274 |
char VKFMT[] = "%+1.9e %+1.9e %+1.9e"; |
| 275 |
#define VKLEN 64 |
| 276 |
|
| 277 |
#define mkvkey(k,v) sprintf(k, VKFMT, (v)[0], (v)[1], (v)[2]) |
| 278 |
|
| 279 |
#define NVERTS 256 |
| 280 |
|
| 281 |
long clock; /* incremented at each vertex request */ |
| 282 |
|
| 283 |
struct vert { |
| 284 |
long lused; /* when last used (0 if unassigned) */ |
| 285 |
FVECT p; /* track point position only */ |
| 286 |
} vert[NVERTS]; |
| 287 |
|
| 288 |
LUTAB vertab = LU_SINIT(free,NULL); /* our vertex lookup table */ |
| 289 |
|
| 290 |
|
| 291 |
char * |
| 292 |
getvertid(vp) /* get/set vertex ID for this point */ |
| 293 |
FVECT vp; |
| 294 |
{ |
| 295 |
static char vname[6]; |
| 296 |
char vkey[VKLEN]; |
| 297 |
register LUENT *lp; |
| 298 |
register int i, vndx; |
| 299 |
|
| 300 |
if (!vertab.tsiz && !lu_init(&vertab, NVERTS)) |
| 301 |
goto memerr; |
| 302 |
clock++; /* increment counter */ |
| 303 |
mkvkey(vkey, vp); |
| 304 |
if ((lp = lu_find(&vertab, vkey)) == NULL) |
| 305 |
goto memerr; |
| 306 |
if (lp->data == NULL) { /* allocate new vertex entry */ |
| 307 |
if (lp->key != NULL) /* reclaim deleted entry */ |
| 308 |
vertab.ndel--; |
| 309 |
else { |
| 310 |
if ((lp->key = (char *)malloc(VKLEN)) == NULL) |
| 311 |
goto memerr; |
| 312 |
strcpy(lp->key, vkey); |
| 313 |
} |
| 314 |
vndx = 0; /* find oldest vertex */ |
| 315 |
for (i = 1; i < NVERTS; i++) |
| 316 |
if (vert[i].lused < vert[vndx].lused) |
| 317 |
vndx = i; |
| 318 |
if (vert[vndx].lused) { /* free old entry first */ |
| 319 |
mkvkey(vkey, vert[vndx].p); |
| 320 |
lu_delete(&vertab, vkey); |
| 321 |
} |
| 322 |
vert[vndx].lused = clock; /* assign it */ |
| 323 |
VCOPY(vert[vndx].p, vp); |
| 324 |
printf("v v%d =\np %.15g %.15g %.15g\n", /* print it */ |
| 325 |
vndx, vp[0], vp[1], vp[2]); |
| 326 |
lp->data = (char *)&vert[vndx]; /* set it */ |
| 327 |
} else |
| 328 |
vndx = (struct vert *)lp->data - vert; |
| 329 |
sprintf(vname, "v%d", vndx); |
| 330 |
return(vname); |
| 331 |
memerr: |
| 332 |
fputs("Out of memory in getvertid!\n", stderr); |
| 333 |
exit(1); |
| 334 |
} |
| 335 |
|
| 336 |
|
| 337 |
int |
| 338 |
o_face(mod, typ, id, fa) /* print out a polygon */ |
| 339 |
char *mod, *typ, *id; |
| 340 |
FUNARGS *fa; |
| 341 |
{ |
| 342 |
char entbuf[512]; |
| 343 |
register char *cp1, *cp2; |
| 344 |
register int i; |
| 345 |
|
| 346 |
if (fa->nfargs < 9 | fa->nfargs % 3) |
| 347 |
return(-1); |
| 348 |
setmat(mod); |
| 349 |
printf("o %s\n", id); |
| 350 |
cp1 = entbuf; |
| 351 |
*cp1++ = 'f'; |
| 352 |
for (i = 0; i < fa->nfargs; i += 3) { |
| 353 |
cp2 = getvertid(fa->farg + i); |
| 354 |
*cp1++ = ' '; |
| 355 |
while ((*cp1 = *cp2++)) |
| 356 |
cp1++; |
| 357 |
} |
| 358 |
puts(entbuf); |
| 359 |
puts("o"); |
| 360 |
return(0); |
| 361 |
} |
| 362 |
|
| 363 |
|
| 364 |
int |
| 365 |
o_cone(mod, typ, id, fa) /* print out a cone */ |
| 366 |
char *mod, *typ, *id; |
| 367 |
register FUNARGS *fa; |
| 368 |
{ |
| 369 |
if (fa->nfargs != 8) |
| 370 |
return(-1); |
| 371 |
setmat(mod); |
| 372 |
printf("o %s\n", id); |
| 373 |
printf("v cv1 =\np %.12g %.12g %.12g\n", |
| 374 |
fa->farg[0], fa->farg[1], fa->farg[2]); |
| 375 |
printf("v cv2 =\np %.12g %.12g %.12g\n", |
| 376 |
fa->farg[3], fa->farg[4], fa->farg[5]); |
| 377 |
if (typ[1] == 'u') /* cup -> inverted cone */ |
| 378 |
printf("cone cv1 %.12g cv2 %.12g\n", |
| 379 |
-fa->farg[6], -fa->farg[7]); |
| 380 |
else |
| 381 |
printf("cone cv1 %.12g cv2 %.12g\n", |
| 382 |
fa->farg[6], fa->farg[7]); |
| 383 |
puts("o"); |
| 384 |
return(0); |
| 385 |
} |
| 386 |
|
| 387 |
|
| 388 |
int |
| 389 |
o_sphere(mod, typ, id, fa) /* print out a sphere */ |
| 390 |
char *mod, *typ, *id; |
| 391 |
register FUNARGS *fa; |
| 392 |
{ |
| 393 |
if (fa->nfargs != 4) |
| 394 |
return(-1); |
| 395 |
setmat(mod); |
| 396 |
printf("o %s\n", id); |
| 397 |
printf("v cent =\np %.12g %.12g %.12g\n", |
| 398 |
fa->farg[0], fa->farg[1], fa->farg[2]); |
| 399 |
printf("sph cent %.12g\n", typ[0]=='b' ? -fa->farg[3] : fa->farg[3]); |
| 400 |
puts("o"); |
| 401 |
return(0); |
| 402 |
} |
| 403 |
|
| 404 |
|
| 405 |
int |
| 406 |
o_cylinder(mod, typ, id, fa) /* print out a cylinder */ |
| 407 |
char *mod, *typ, *id; |
| 408 |
register FUNARGS *fa; |
| 409 |
{ |
| 410 |
if (fa->nfargs != 7) |
| 411 |
return(-1); |
| 412 |
setmat(mod); |
| 413 |
printf("o %s\n", id); |
| 414 |
printf("v cv1 =\np %.12g %.12g %.12g\n", |
| 415 |
fa->farg[0], fa->farg[1], fa->farg[2]); |
| 416 |
printf("v cv2 =\np %.12g %.12g %.12g\n", |
| 417 |
fa->farg[3], fa->farg[4], fa->farg[5]); |
| 418 |
printf("cyl cv1 %.12g cv2\n", |
| 419 |
typ[0]=='t' ? -fa->farg[6] : fa->farg[6]); |
| 420 |
puts("o"); |
| 421 |
return(0); |
| 422 |
} |
| 423 |
|
| 424 |
|
| 425 |
int |
| 426 |
o_ring(mod, typ, id, fa) /* print out a ring */ |
| 427 |
char *mod, *typ, *id; |
| 428 |
register FUNARGS *fa; |
| 429 |
{ |
| 430 |
if (fa->nfargs != 8) |
| 431 |
return(-1); |
| 432 |
setmat(mod); |
| 433 |
printf("o %s\n", id); |
| 434 |
printf("v cent =\np %.12g %.12g %.12g\n", |
| 435 |
fa->farg[0], fa->farg[1], fa->farg[2]); |
| 436 |
printf("n %.12g %.12g %.12g\n", |
| 437 |
fa->farg[3], fa->farg[4], fa->farg[5]); |
| 438 |
if (fa->farg[6] < fa->farg[7]) |
| 439 |
printf("ring cent %.12g %.12g\n", |
| 440 |
fa->farg[6], fa->farg[7]); |
| 441 |
else |
| 442 |
printf("ring cent %.12g %.12g\n", |
| 443 |
fa->farg[7], fa->farg[6]); |
| 444 |
puts("o"); |
| 445 |
return(0); |
| 446 |
} |
| 447 |
|
| 448 |
|
| 449 |
int |
| 450 |
o_instance(mod, typ, id, fa) /* convert an instance */ |
| 451 |
char *mod, *typ, *id; |
| 452 |
FUNARGS *fa; |
| 453 |
{ |
| 454 |
return(0); /* this is too damned difficult! */ |
| 455 |
} |
| 456 |
|
| 457 |
|
| 458 |
int |
| 459 |
o_source(mod, typ, id, fa) /* convert a source */ |
| 460 |
char *mod, *typ, *id; |
| 461 |
FUNARGS *fa; |
| 462 |
{ |
| 463 |
return(0); /* there is no MGF equivalent! */ |
| 464 |
} |
| 465 |
|
| 466 |
|
| 467 |
int |
| 468 |
o_illum(mod, typ, id, fa) /* convert an illum material */ |
| 469 |
char *mod, *typ, *id; |
| 470 |
FUNARGS *fa; |
| 471 |
{ |
| 472 |
if (fa->nsargs == 1 && strcmp(fa->sarg[0], VOIDID)) { |
| 473 |
newmat(id, fa->sarg[0]); /* just create alias */ |
| 474 |
return(0); |
| 475 |
} |
| 476 |
/* else create invisible material */ |
| 477 |
newmat(id, NULL); |
| 478 |
puts("ts 1 0"); |
| 479 |
return(0); |
| 480 |
} |
| 481 |
|
| 482 |
|
| 483 |
int |
| 484 |
o_plastic(mod, typ, id, fa) /* convert a plastic material */ |
| 485 |
char *mod, *typ, *id; |
| 486 |
register FUNARGS *fa; |
| 487 |
{ |
| 488 |
COLOR cxyz, rrgb; |
| 489 |
double d; |
| 490 |
|
| 491 |
if (fa->nfargs != (typ[7]=='2' ? 6 : 5)) |
| 492 |
return(-1); |
| 493 |
newmat(id, NULL); |
| 494 |
rrgb[0] = fa->farg[0]; rrgb[1] = fa->farg[1]; rrgb[2] = fa->farg[2]; |
| 495 |
rgb_cie(cxyz, rrgb); |
| 496 |
puts("c"); /* put diffuse component */ |
| 497 |
d = cxyz[0] + cxyz[1] + cxyz[2]; |
| 498 |
if (d > FTINY) |
| 499 |
printf("cxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d); |
| 500 |
printf("rd %.4f\n", cxyz[1]*(1. - fa->farg[3])); |
| 501 |
puts("c"); /* put specular component */ |
| 502 |
printf("rs %.4f %.4f\n", fa->farg[3], |
| 503 |
typ[7]=='2' ? .5*(fa->farg[4] + fa->farg[5]) : |
| 504 |
fa->farg[4]); |
| 505 |
return(0); |
| 506 |
} |
| 507 |
|
| 508 |
|
| 509 |
int |
| 510 |
o_metal(mod, typ, id, fa) /* convert a metal material */ |
| 511 |
char *mod, *typ, *id; |
| 512 |
register FUNARGS *fa; |
| 513 |
{ |
| 514 |
COLOR cxyz, rrgb; |
| 515 |
double d; |
| 516 |
|
| 517 |
if (fa->nfargs != (typ[5]=='2' ? 6 : 5)) |
| 518 |
return(-1); |
| 519 |
newmat(id, NULL); |
| 520 |
rrgb[0] = fa->farg[0]; rrgb[1] = fa->farg[1]; rrgb[2] = fa->farg[2]; |
| 521 |
rgb_cie(cxyz, rrgb); |
| 522 |
puts("c"); /* put diffuse component */ |
| 523 |
d = cxyz[0] + cxyz[1] + cxyz[2]; |
| 524 |
if (d > FTINY) |
| 525 |
printf("cxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d); |
| 526 |
printf("rd %.4f\n", cxyz[1]*(1. - fa->farg[3])); |
| 527 |
/* put specular component */ |
| 528 |
printf("rs %.4f %.4f\n", cxyz[1]*fa->farg[3], |
| 529 |
typ[5]=='2' ? .5*(fa->farg[4] + fa->farg[5]) : |
| 530 |
fa->farg[4]); |
| 531 |
return(0); |
| 532 |
} |
| 533 |
|
| 534 |
|
| 535 |
int |
| 536 |
o_glass(mod, typ, id, fa) /* convert a glass material */ |
| 537 |
char *mod, *typ, *id; |
| 538 |
register FUNARGS *fa; |
| 539 |
{ |
| 540 |
COLOR cxyz, rrgb, trgb; |
| 541 |
double nrfr = 1.52, F, d; |
| 542 |
register int i; |
| 543 |
|
| 544 |
if (fa->nfargs != 3 && fa->nfargs != 4) |
| 545 |
return(-1); |
| 546 |
newmat(id, NULL); |
| 547 |
if (fa->nfargs == 4) |
| 548 |
nrfr = fa->farg[3]; |
| 549 |
F = (1. - nrfr)/(1. + nrfr); /* use normal incidence */ |
| 550 |
F *= F; |
| 551 |
for (i = 0; i < 3; i++) { |
| 552 |
rrgb[i] = (1. - F)*(1. - F)/(1. - F*F*fa->farg[i]*fa->farg[i]); |
| 553 |
trgb[i] = F * (1. + (1. - 2.*F)*fa->farg[i]) / |
| 554 |
(1. - F*F*fa->farg[i]*fa->farg[i]); |
| 555 |
} |
| 556 |
rgb_cie(cxyz, rrgb); /* put reflected component */ |
| 557 |
puts("c"); |
| 558 |
d = cxyz[0] + cxyz[1] + cxyz[2]; |
| 559 |
if (d > FTINY) |
| 560 |
printf("cxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d); |
| 561 |
printf("rs %.4f 0\n", cxyz[1]); |
| 562 |
rgb_cie(cxyz, trgb); /* put transmitted component */ |
| 563 |
puts("c"); |
| 564 |
d = cxyz[0] + cxyz[1] + cxyz[2]; |
| 565 |
if (d > FTINY) |
| 566 |
printf("cxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d); |
| 567 |
printf("ts %.4f 0\n", cxyz[1]); |
| 568 |
return(0); |
| 569 |
} |
| 570 |
|
| 571 |
|
| 572 |
int |
| 573 |
o_mirror(mod, typ, id, fa) /* convert a mirror material */ |
| 574 |
char *mod, *typ, *id; |
| 575 |
register FUNARGS *fa; |
| 576 |
{ |
| 577 |
COLOR cxyz, rrgb; |
| 578 |
double d; |
| 579 |
|
| 580 |
if (fa->nsargs == 1) { /* use alternate material */ |
| 581 |
newmat(id, fa->sarg[0]); |
| 582 |
return(0); |
| 583 |
} |
| 584 |
if (fa->nfargs != 3) |
| 585 |
return(-1); |
| 586 |
newmat(id, NULL); |
| 587 |
rrgb[0] = fa->farg[0]; rrgb[1] = fa->farg[1]; rrgb[2] = fa->farg[2]; |
| 588 |
rgb_cie(cxyz, rrgb); |
| 589 |
puts("c"); /* put specular component */ |
| 590 |
d = cxyz[0] + cxyz[1] + cxyz[2]; |
| 591 |
if (d > FTINY) |
| 592 |
printf("cxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d); |
| 593 |
printf("rs %.4f 0\n", cxyz[1]); |
| 594 |
return(0); |
| 595 |
} |
| 596 |
|
| 597 |
|
| 598 |
int |
| 599 |
o_trans(mod, typ, id, fa) /* convert a trans material */ |
| 600 |
char *mod, *typ, *id; |
| 601 |
register FUNARGS *fa; |
| 602 |
{ |
| 603 |
COLOR cxyz, rrgb; |
| 604 |
double rough, trans, tspec, d; |
| 605 |
|
| 606 |
if (typ[4] == '2') { /* trans2 */ |
| 607 |
if (fa->nfargs != 8) |
| 608 |
return(-1); |
| 609 |
rough = .5*(fa->farg[4] + fa->farg[5]); |
| 610 |
trans = fa->farg[6]; |
| 611 |
tspec = fa->farg[7]; |
| 612 |
} else { /* trans */ |
| 613 |
if (fa->nfargs != 7) |
| 614 |
return(-1); |
| 615 |
rough = fa->farg[4]; |
| 616 |
trans = fa->farg[5]; |
| 617 |
tspec = fa->farg[6]; |
| 618 |
} |
| 619 |
newmat(id, NULL); |
| 620 |
rrgb[0] = fa->farg[0]; rrgb[1] = fa->farg[1]; rrgb[2] = fa->farg[2]; |
| 621 |
rgb_cie(cxyz, rrgb); |
| 622 |
puts("c"); /* put transmitted diffuse */ |
| 623 |
d = cxyz[0] + cxyz[1] + cxyz[2]; |
| 624 |
if (d > FTINY) |
| 625 |
printf("cxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d); |
| 626 |
printf("td %.4f\n", cxyz[1]*trans*(1. - fa->farg[3])*(1. - tspec)); |
| 627 |
/* put transmitted specular */ |
| 628 |
printf("ts %.4f %.4f\n", cxyz[1]*trans*tspec*(1. - fa->farg[3]), rough); |
| 629 |
/* put reflected diffuse */ |
| 630 |
printf("rd %.4f\n", cxyz[1]*(1. - fa->farg[3])*(1. - trans)); |
| 631 |
puts("c"); /* put reflected specular */ |
| 632 |
printf("rs %.4f %.4f\n", fa->farg[3], rough); |
| 633 |
return(0); |
| 634 |
} |
| 635 |
|
| 636 |
|
| 637 |
int |
| 638 |
o_light(mod, typ, id, fa) /* convert a light type */ |
| 639 |
char *mod, *typ, *id; |
| 640 |
register FUNARGS *fa; |
| 641 |
{ |
| 642 |
COLOR cxyz, rrgb; |
| 643 |
double d; |
| 644 |
|
| 645 |
if (fa->nfargs < 3) |
| 646 |
return(-1); |
| 647 |
newmat(id, NULL); |
| 648 |
rrgb[0] = fa->farg[0]; rrgb[1] = fa->farg[1]; rrgb[2] = fa->farg[2]; |
| 649 |
rgb_cie(cxyz, rrgb); |
| 650 |
d = cxyz[0] + cxyz[1] + cxyz[2]; |
| 651 |
puts("c"); |
| 652 |
if (d > FTINY) |
| 653 |
printf("cxy %.4f %.4f\n", cxyz[0]/d, cxyz[1]/d); |
| 654 |
printf("ed %.4g\n", cxyz[1]); |
| 655 |
return(0); |
| 656 |
} |
