1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: mgf2rad.c,v 2.27 2003/07/27 22:12:01 schorsch Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* Convert MGF (Materials and Geometry Format) to Radiance |
6 |
*/ |
7 |
|
8 |
#include <stdio.h> |
9 |
#include <stdlib.h> |
10 |
#include <math.h> |
11 |
#include <string.h> |
12 |
|
13 |
#include "platform.h" |
14 |
#include "mgflib/parser.h" |
15 |
#include "color.h" |
16 |
#include "tmesh.h" |
17 |
|
18 |
#define putv(v) printf("%18.12g %18.12g %18.12g\n",(v)[0],(v)[1],(v)[2]) |
19 |
|
20 |
#define invert (xf_context != NULL && xf_context->rev) |
21 |
|
22 |
double glowdist = FHUGE; /* glow test distance */ |
23 |
|
24 |
double emult = 1.; /* emitter multiplier */ |
25 |
|
26 |
FILE *matfp; /* material output file */ |
27 |
|
28 |
|
29 |
int r_comment(int ac, char **av); |
30 |
int r_cone(int ac, char **av); |
31 |
int r_cyl(int ac, char **av); |
32 |
int r_sph(int ac, char **av); |
33 |
int r_ring(int ac, char **av); |
34 |
int r_face(int ac, char **av); |
35 |
int r_ies(int ac, char **av); |
36 |
char * material(void); |
37 |
char * object(void); |
38 |
char * addarg(char *op, char *arg); |
39 |
void do_tri(char *mat, C_VERTEX *cv1, C_VERTEX *cv2, C_VERTEX *cv3, int iv); |
40 |
void cvtcolor(COLOR radrgb, register C_COLOR *ciec, double intensity); |
41 |
|
42 |
|
43 |
int |
44 |
main( |
45 |
int argc, |
46 |
char *argv[] |
47 |
) |
48 |
{ |
49 |
int i; |
50 |
|
51 |
matfp = stdout; |
52 |
/* print out parser version */ |
53 |
printf("## Translated from MGF Version %d.%d\n", MG_VMAJOR, MG_VMINOR); |
54 |
/* initialize dispatch table */ |
55 |
mg_ehand[MG_E_COMMENT] = r_comment; /* we pass comments */ |
56 |
mg_ehand[MG_E_COLOR] = c_hcolor; /* they get color */ |
57 |
mg_ehand[MG_E_CONE] = r_cone; /* we do cones */ |
58 |
mg_ehand[MG_E_CMIX] = c_hcolor; /* they mix colors */ |
59 |
mg_ehand[MG_E_CSPEC] = c_hcolor; /* they get spectra */ |
60 |
mg_ehand[MG_E_CXY] = c_hcolor; /* they get chromaticities */ |
61 |
mg_ehand[MG_E_CCT] = c_hcolor; /* they get color temp's */ |
62 |
mg_ehand[MG_E_CYL] = r_cyl; /* we do cylinders */ |
63 |
mg_ehand[MG_E_ED] = c_hmaterial; /* they get emission */ |
64 |
mg_ehand[MG_E_FACE] = r_face; /* we do faces */ |
65 |
mg_ehand[MG_E_IES] = r_ies; /* we do IES files */ |
66 |
mg_ehand[MG_E_IR] = c_hmaterial; /* they get refractive index */ |
67 |
mg_ehand[MG_E_MATERIAL] = c_hmaterial; /* they get materials */ |
68 |
mg_ehand[MG_E_NORMAL] = c_hvertex; /* they get normals */ |
69 |
mg_ehand[MG_E_OBJECT] = obj_handler; /* they track object names */ |
70 |
mg_ehand[MG_E_POINT] = c_hvertex; /* they get points */ |
71 |
mg_ehand[MG_E_RD] = c_hmaterial; /* they get diffuse refl. */ |
72 |
mg_ehand[MG_E_RING] = r_ring; /* we do rings */ |
73 |
mg_ehand[MG_E_RS] = c_hmaterial; /* they get specular refl. */ |
74 |
mg_ehand[MG_E_SIDES] = c_hmaterial; /* they get # sides */ |
75 |
mg_ehand[MG_E_SPH] = r_sph; /* we do spheres */ |
76 |
mg_ehand[MG_E_TD] = c_hmaterial; /* they get diffuse trans. */ |
77 |
mg_ehand[MG_E_TS] = c_hmaterial; /* they get specular trans. */ |
78 |
mg_ehand[MG_E_VERTEX] = c_hvertex; /* they get vertices */ |
79 |
mg_ehand[MG_E_XF] = xf_handler; /* they track transforms */ |
80 |
mg_init(); /* initialize the parser */ |
81 |
/* get our options & print header */ |
82 |
printf("## %s", argv[0]); |
83 |
for (i = 1; i < argc && argv[i][0] == '-'; i++) { |
84 |
printf(" %s", argv[i]); |
85 |
switch (argv[i][1]) { |
86 |
case 'g': /* glow distance (meters) */ |
87 |
if (argv[i][2] || badarg(argc-i-1, argv+i+1, "f")) |
88 |
goto userr; |
89 |
glowdist = atof(argv[++i]); |
90 |
printf(" %s", argv[i]); |
91 |
break; |
92 |
case 'e': /* emitter multiplier */ |
93 |
if (argv[i][2] || badarg(argc-i-1, argv+i+1, "f")) |
94 |
goto userr; |
95 |
emult = atof(argv[++i]); |
96 |
printf(" %s", argv[i]); |
97 |
break; |
98 |
case 'm': /* materials file */ |
99 |
matfp = fopen(argv[++i], "a"); |
100 |
if (matfp == NULL) { |
101 |
fprintf(stderr, "%s: cannot append\n", argv[i]); |
102 |
exit(1); |
103 |
} |
104 |
printf(" %s", argv[i]); |
105 |
break; |
106 |
default: |
107 |
goto userr; |
108 |
} |
109 |
} |
110 |
putchar('\n'); |
111 |
if (i == argc) { /* convert stdin */ |
112 |
if (mg_load(NULL) != MG_OK) |
113 |
exit(1); |
114 |
if (mg_nunknown) |
115 |
printf("## %s: %u unknown entities\n", |
116 |
argv[0], mg_nunknown); |
117 |
} else /* convert each file */ |
118 |
for ( ; i < argc; i++) { |
119 |
printf("## %s %s ##############################\n", |
120 |
argv[0], argv[i]); |
121 |
if (mg_load(argv[i]) != MG_OK) |
122 |
exit(1); |
123 |
if (mg_nunknown) { |
124 |
printf("## %s %s: %u unknown entities\n", |
125 |
argv[0], argv[i], mg_nunknown); |
126 |
mg_nunknown = 0; |
127 |
} |
128 |
} |
129 |
exit(0); |
130 |
userr: |
131 |
fprintf(stderr, "Usage: %s [-g dist][-e mult][-m matf] [file.mgf] ..\n", |
132 |
argv[0]); |
133 |
exit(1); |
134 |
} |
135 |
|
136 |
|
137 |
int |
138 |
r_comment( /* repeat a comment verbatim */ |
139 |
register int ac, |
140 |
register char **av |
141 |
) |
142 |
{ |
143 |
putchar('#'); /* use Radiance comment character */ |
144 |
while (--ac) { /* pass through verbatim */ |
145 |
putchar(' '); |
146 |
fputs(*++av, stdout); |
147 |
} |
148 |
putchar('\n'); |
149 |
return(MG_OK); |
150 |
} |
151 |
|
152 |
|
153 |
int |
154 |
r_cone( /* put out a cone */ |
155 |
int ac, |
156 |
char **av |
157 |
) |
158 |
{ |
159 |
static int ncones; |
160 |
char *mat; |
161 |
double r1, r2; |
162 |
C_VERTEX *cv1, *cv2; |
163 |
FVECT p1, p2; |
164 |
int inv; |
165 |
/* check argument count and type */ |
166 |
if (ac != 5) |
167 |
return(MG_EARGC); |
168 |
if (!isflt(av[2]) || !isflt(av[4])) |
169 |
return(MG_ETYPE); |
170 |
/* get the endpoint vertices */ |
171 |
if ((cv1 = c_getvert(av[1])) == NULL || |
172 |
(cv2 = c_getvert(av[3])) == NULL) |
173 |
return(MG_EUNDEF); |
174 |
xf_xfmpoint(p1, cv1->p); /* transform endpoints */ |
175 |
xf_xfmpoint(p2, cv2->p); |
176 |
r1 = xf_scale(atof(av[2])); /* scale radii */ |
177 |
r2 = xf_scale(atof(av[4])); |
178 |
inv = r1 < 0.; /* check for inverted cone */ |
179 |
if (r1 == 0.) { /* check for illegal radii */ |
180 |
if (r2 == 0.) |
181 |
return(MG_EILL); |
182 |
inv = r2 < 0.; |
183 |
} else if (r2 != 0. && inv ^ (r2 < 0.)) |
184 |
return(MG_EILL); |
185 |
if (inv) { |
186 |
r1 = -r1; |
187 |
r2 = -r2; |
188 |
} |
189 |
if ((mat = material()) == NULL) /* get material */ |
190 |
return(MG_EBADMAT); |
191 |
/* spit the sucker out */ |
192 |
printf("\n%s %s %sc%d\n", mat, inv ? "cup" : "cone", |
193 |
object(), ++ncones); |
194 |
printf("0\n0\n8\n"); |
195 |
putv(p1); |
196 |
putv(p2); |
197 |
printf("%18.12g %18.12g\n", r1, r2); |
198 |
return(MG_OK); |
199 |
} |
200 |
|
201 |
|
202 |
int |
203 |
r_cyl( /* put out a cylinder */ |
204 |
int ac, |
205 |
char **av |
206 |
) |
207 |
{ |
208 |
static int ncyls; |
209 |
char *mat; |
210 |
double rad; |
211 |
C_VERTEX *cv1, *cv2; |
212 |
FVECT p1, p2; |
213 |
int inv; |
214 |
/* check argument count and type */ |
215 |
if (ac != 4) |
216 |
return(MG_EARGC); |
217 |
if (!isflt(av[2])) |
218 |
return(MG_ETYPE); |
219 |
/* get the endpoint vertices */ |
220 |
if ((cv1 = c_getvert(av[1])) == NULL || |
221 |
(cv2 = c_getvert(av[3])) == NULL) |
222 |
return(MG_EUNDEF); |
223 |
xf_xfmpoint(p1, cv1->p); /* transform endpoints */ |
224 |
xf_xfmpoint(p2, cv2->p); |
225 |
rad = xf_scale(atof(av[2])); /* scale radius */ |
226 |
if ((inv = rad < 0.)) /* check for inverted cylinder */ |
227 |
rad = -rad; |
228 |
if ((mat = material()) == NULL) /* get material */ |
229 |
return(MG_EBADMAT); |
230 |
/* spit out the primitive */ |
231 |
printf("\n%s %s %scy%d\n", mat, inv ? "tube" : "cylinder", |
232 |
object(), ++ncyls); |
233 |
printf("0\n0\n7\n"); |
234 |
putv(p1); |
235 |
putv(p2); |
236 |
printf("%18.12g\n", rad); |
237 |
return(MG_OK); |
238 |
} |
239 |
|
240 |
|
241 |
int |
242 |
r_sph( /* put out a sphere */ |
243 |
int ac, |
244 |
char **av |
245 |
) |
246 |
{ |
247 |
static int nsphs; |
248 |
char *mat; |
249 |
double rad; |
250 |
C_VERTEX *cv; |
251 |
FVECT cent; |
252 |
int inv; |
253 |
/* check argument count and type */ |
254 |
if (ac != 3) |
255 |
return(MG_EARGC); |
256 |
if (!isflt(av[2])) |
257 |
return(MG_ETYPE); |
258 |
if ((cv = c_getvert(av[1])) == NULL) /* get center vertex */ |
259 |
return(MG_EUNDEF); |
260 |
xf_xfmpoint(cent, cv->p); /* transform center */ |
261 |
rad = xf_scale(atof(av[2])); /* scale radius */ |
262 |
if ((inv = rad < 0.)) /* check for inversion */ |
263 |
rad = -rad; |
264 |
if ((mat = material()) == NULL) /* get material */ |
265 |
return(MG_EBADMAT); |
266 |
/* spit out primitive */ |
267 |
printf("\n%s %s %ss%d\n", mat, inv ? "bubble" : "sphere", |
268 |
object(), ++nsphs); |
269 |
printf("0\n0\n4 %18.12g %18.12g %18.12g %18.12g\n", |
270 |
cent[0], cent[1], cent[2], rad); |
271 |
return(MG_OK); |
272 |
} |
273 |
|
274 |
|
275 |
int |
276 |
r_ring( /* put out a ring */ |
277 |
int ac, |
278 |
char **av |
279 |
) |
280 |
{ |
281 |
static int nrings; |
282 |
char *mat; |
283 |
double r1, r2; |
284 |
C_VERTEX *cv; |
285 |
FVECT cent, norm; |
286 |
/* check argument count and type */ |
287 |
if (ac != 4) |
288 |
return(MG_EARGC); |
289 |
if (!isflt(av[2]) || !isflt(av[3])) |
290 |
return(MG_ETYPE); |
291 |
if ((cv = c_getvert(av[1])) == NULL) /* get center vertex */ |
292 |
return(MG_EUNDEF); |
293 |
if (is0vect(cv->n)) /* make sure we have normal */ |
294 |
return(MG_EILL); |
295 |
xf_xfmpoint(cent, cv->p); /* transform center */ |
296 |
xf_rotvect(norm, cv->n); /* rotate normal */ |
297 |
r1 = xf_scale(atof(av[2])); /* scale radii */ |
298 |
r2 = xf_scale(atof(av[3])); |
299 |
if ((r1 < 0.) | (r2 <= r1)) |
300 |
return(MG_EILL); |
301 |
if ((mat = material()) == NULL) /* get material */ |
302 |
return(MG_EBADMAT); |
303 |
/* spit out primitive */ |
304 |
printf("\n%s ring %sr%d\n", mat, object(), ++nrings); |
305 |
printf("0\n0\n8\n"); |
306 |
putv(cent); |
307 |
putv(norm); |
308 |
printf("%18.12g %18.12g\n", r1, r2); |
309 |
return(MG_OK); |
310 |
} |
311 |
|
312 |
|
313 |
int |
314 |
r_face( /* convert a face */ |
315 |
int ac, |
316 |
char **av |
317 |
) |
318 |
{ |
319 |
static int nfaces; |
320 |
int myi = invert; |
321 |
char *mat; |
322 |
register int i; |
323 |
register C_VERTEX *cv; |
324 |
FVECT v; |
325 |
|
326 |
/* check argument count and type */ |
327 |
if (ac < 4) |
328 |
return(MG_EARGC); |
329 |
if ((mat = material()) == NULL) /* get material */ |
330 |
return(MG_EBADMAT); |
331 |
if (ac <= 5) { /* check for smoothing */ |
332 |
C_VERTEX *cva[5]; |
333 |
for (i = 1; i < ac; i++) { |
334 |
if ((cva[i-1] = c_getvert(av[i])) == NULL) |
335 |
return(MG_EUNDEF); |
336 |
if (is0vect(cva[i-1]->n)) |
337 |
break; |
338 |
} |
339 |
if (i < ac) |
340 |
i = ISFLAT; |
341 |
else |
342 |
i = flat_tri(cva[0]->p, cva[1]->p, cva[2]->p, |
343 |
cva[0]->n, cva[1]->n, cva[2]->n); |
344 |
if (i == DEGEN) |
345 |
return(MG_OK); /* degenerate (error?) */ |
346 |
if (i == RVBENT) { |
347 |
myi = !myi; |
348 |
i = ISBENT; |
349 |
} else if (i == RVFLAT) { |
350 |
myi = !myi; |
351 |
i = ISFLAT; |
352 |
} |
353 |
if (i == ISBENT) { /* smoothed triangles */ |
354 |
do_tri(mat, cva[0], cva[1], cva[2], myi); |
355 |
if (ac == 5) |
356 |
do_tri(mat, cva[2], cva[3], cva[0], myi); |
357 |
return(MG_OK); |
358 |
} |
359 |
} |
360 |
/* spit out unsmoothed primitive */ |
361 |
printf("\n%s polygon %sf%d\n", mat, object(), ++nfaces); |
362 |
printf("0\n0\n%d\n", 3*(ac-1)); |
363 |
for (i = 1; i < ac; i++) { /* get, transform, print each vertex */ |
364 |
if ((cv = c_getvert(av[myi ? ac-i : i])) == NULL) |
365 |
return(MG_EUNDEF); |
366 |
xf_xfmpoint(v, cv->p); |
367 |
putv(v); |
368 |
} |
369 |
return(MG_OK); |
370 |
} |
371 |
|
372 |
|
373 |
int |
374 |
r_ies( /* convert an IES luminaire file */ |
375 |
int ac, |
376 |
char **av |
377 |
) |
378 |
{ |
379 |
int xa0 = 2; |
380 |
char combuf[128]; |
381 |
char fname[48]; |
382 |
char *oname; |
383 |
register char *op; |
384 |
register int i; |
385 |
/* check argument count */ |
386 |
if (ac < 2) |
387 |
return(MG_EARGC); |
388 |
/* construct output file name */ |
389 |
if ((op = strrchr(av[1], '/')) != NULL) |
390 |
op++; |
391 |
else |
392 |
op = av[1]; |
393 |
(void)strcpy(fname, op); |
394 |
if ((op = strrchr(fname, '.')) == NULL) |
395 |
op = fname + strlen(fname); |
396 |
(void)strcpy(op, ".rad"); |
397 |
/* see if we need to run ies2rad */ |
398 |
if (access(fname, 0) == -1) { |
399 |
(void)strcpy(combuf, "ies2rad");/* build ies2rad command */ |
400 |
op = combuf + 7; /* get -m option (first) */ |
401 |
if (ac-xa0 >= 2 && !strcmp(av[xa0], "-m")) { |
402 |
if (!isflt(av[xa0+1])) |
403 |
return(MG_ETYPE); |
404 |
op = addarg(addarg(op, "-m"), av[xa0+1]); |
405 |
xa0 += 2; |
406 |
} |
407 |
*op++ = ' '; /* build IES filename */ |
408 |
i = 0; |
409 |
if (mg_file != NULL && |
410 |
(oname = strrchr(mg_file->fname,'/')) != NULL) { |
411 |
i = oname - mg_file->fname + 1; |
412 |
(void)strcpy(op, mg_file->fname); |
413 |
} |
414 |
(void)strcpy(op+i, av[1]); |
415 |
if (access(op, 0) == -1) /* check for file existence */ |
416 |
return(MG_ENOFILE); |
417 |
system(combuf); /* run ies2rad */ |
418 |
if (access(fname, 0) == -1) /* check success */ |
419 |
return(MG_EINCL); |
420 |
} |
421 |
printf("\n!xform"); /* put out xform command */ |
422 |
oname = object(); |
423 |
if (*oname) { |
424 |
printf(" -n "); |
425 |
for (op = oname; op[1]; op++) /* remove trailing separator */ |
426 |
putchar(*op); |
427 |
} |
428 |
for (i = xa0; i < ac; i++) |
429 |
printf(" %s", av[i]); |
430 |
if (ac > xa0 && xf_argc > 0) |
431 |
printf(" -i 1"); |
432 |
for (i = 0; i < xf_argc; i++) |
433 |
printf(" %s", xf_argv[i]); |
434 |
printf(" %s\n", fname); |
435 |
return(MG_OK); |
436 |
} |
437 |
|
438 |
|
439 |
void |
440 |
do_tri( /* put out smoothed triangle */ |
441 |
char *mat, |
442 |
C_VERTEX *cv1, |
443 |
C_VERTEX *cv2, |
444 |
C_VERTEX *cv3, |
445 |
int iv |
446 |
) |
447 |
{ |
448 |
static int ntris; |
449 |
BARYCCM bvecs; |
450 |
RREAL bcoor[3][3]; |
451 |
C_VERTEX *cvt; |
452 |
FVECT v1, v2, v3; |
453 |
FVECT n1, n2, n3; |
454 |
register int i; |
455 |
|
456 |
if (iv) { /* swap vertex order if inverted */ |
457 |
cvt = cv1; |
458 |
cv1 = cv3; |
459 |
cv3 = cvt; |
460 |
} |
461 |
xf_xfmpoint(v1, cv1->p); |
462 |
xf_xfmpoint(v2, cv2->p); |
463 |
xf_xfmpoint(v3, cv3->p); |
464 |
/* compute barycentric coords. */ |
465 |
if (comp_baryc(&bvecs, v1, v2, v3) < 0) |
466 |
return; /* degenerate triangle! */ |
467 |
printf("\n%s texfunc T-nor\n", mat); /* put out texture */ |
468 |
printf("4 dx dy dz %s\n0\n", TCALNAME); |
469 |
xf_rotvect(n1, cv1->n); |
470 |
xf_rotvect(n2, cv2->n); |
471 |
xf_rotvect(n3, cv3->n); |
472 |
for (i = 0; i < 3; i++) { |
473 |
bcoor[i][0] = n1[i]; |
474 |
bcoor[i][1] = n2[i]; |
475 |
bcoor[i][2] = n3[i]; |
476 |
} |
477 |
put_baryc(&bvecs, bcoor, 3); |
478 |
/* put out triangle */ |
479 |
printf("\nT-nor polygon %st%d\n", object(), ++ntris); |
480 |
printf("0\n0\n9\n"); |
481 |
putv(v1); |
482 |
putv(v2); |
483 |
putv(v3); |
484 |
} |
485 |
|
486 |
|
487 |
char * |
488 |
material(void) /* get (and print) current material */ |
489 |
{ |
490 |
char *mname = "mat"; |
491 |
COLOR radrgb, c2; |
492 |
double d; |
493 |
|
494 |
if (c_cmname != NULL) |
495 |
mname = c_cmname; |
496 |
if (!c_cmaterial->clock) |
497 |
return(mname); /* already current */ |
498 |
/* else update output */ |
499 |
c_cmaterial->clock = 0; |
500 |
if (c_cmaterial->ed > .1) { /* emitter */ |
501 |
cvtcolor(radrgb, &c_cmaterial->ed_c, |
502 |
emult*c_cmaterial->ed/(PI*WHTEFFICACY)); |
503 |
if (glowdist < FHUGE) { /* do a glow */ |
504 |
fprintf(matfp, "\nvoid glow %s\n0\n0\n", mname); |
505 |
fprintf(matfp, "4 %f %f %f %f\n", colval(radrgb,RED), |
506 |
colval(radrgb,GRN), |
507 |
colval(radrgb,BLU), glowdist); |
508 |
} else { |
509 |
fprintf(matfp, "\nvoid light %s\n0\n0\n", mname); |
510 |
fprintf(matfp, "3 %f %f %f\n", colval(radrgb,RED), |
511 |
colval(radrgb,GRN), |
512 |
colval(radrgb,BLU)); |
513 |
} |
514 |
return(mname); |
515 |
} |
516 |
d = c_cmaterial->rd + c_cmaterial->td + |
517 |
c_cmaterial->rs + c_cmaterial->ts; |
518 |
if ((d < 0.) | (d > 1.)) |
519 |
return(NULL); |
520 |
/* check for glass/dielectric */ |
521 |
if (c_cmaterial->nr > 1.1 && |
522 |
c_cmaterial->ts > .25 && c_cmaterial->rs <= .125 && |
523 |
c_cmaterial->td <= .01 && c_cmaterial->rd <= .01 && |
524 |
c_cmaterial->rs_a <= .01 && c_cmaterial->ts_a <= .01) { |
525 |
cvtcolor(radrgb, &c_cmaterial->ts_c, |
526 |
c_cmaterial->ts + c_cmaterial->rs); |
527 |
if (c_cmaterial->sided) { /* dielectric */ |
528 |
colval(radrgb,RED) = pow(colval(radrgb,RED), |
529 |
1./C_1SIDEDTHICK); |
530 |
colval(radrgb,GRN) = pow(colval(radrgb,GRN), |
531 |
1./C_1SIDEDTHICK); |
532 |
colval(radrgb,BLU) = pow(colval(radrgb,BLU), |
533 |
1./C_1SIDEDTHICK); |
534 |
fprintf(matfp, "\nvoid dielectric %s\n0\n0\n", mname); |
535 |
fprintf(matfp, "5 %g %g %g %f 0\n", colval(radrgb,RED), |
536 |
colval(radrgb,GRN), colval(radrgb,BLU), |
537 |
c_cmaterial->nr); |
538 |
return(mname); |
539 |
} |
540 |
/* glass */ |
541 |
fprintf(matfp, "\nvoid glass %s\n0\n0\n", mname); |
542 |
fprintf(matfp, "4 %f %f %f %f\n", colval(radrgb,RED), |
543 |
colval(radrgb,GRN), colval(radrgb,BLU), |
544 |
c_cmaterial->nr); |
545 |
return(mname); |
546 |
} |
547 |
/* check for trans */ |
548 |
if (c_cmaterial->td > .01 || c_cmaterial->ts > .01) { |
549 |
double ts, a5, a6; |
550 |
|
551 |
if (c_cmaterial->sided) { |
552 |
ts = sqrt(c_cmaterial->ts); /* approximate */ |
553 |
a5 = .5; |
554 |
} else { |
555 |
ts = c_cmaterial->ts; |
556 |
a5 = 1.; |
557 |
} |
558 |
/* average colors */ |
559 |
d = c_cmaterial->rd + c_cmaterial->td + ts; |
560 |
cvtcolor(radrgb, &c_cmaterial->rd_c, c_cmaterial->rd/d); |
561 |
cvtcolor(c2, &c_cmaterial->td_c, c_cmaterial->td/d); |
562 |
addcolor(radrgb, c2); |
563 |
cvtcolor(c2, &c_cmaterial->ts_c, ts/d); |
564 |
addcolor(radrgb, c2); |
565 |
if (c_cmaterial->rs + ts > .0001) |
566 |
a5 = (c_cmaterial->rs*c_cmaterial->rs_a + |
567 |
ts*a5*c_cmaterial->ts_a) / |
568 |
(c_cmaterial->rs + ts); |
569 |
a6 = (c_cmaterial->td + ts) / |
570 |
(c_cmaterial->rd + c_cmaterial->td + ts); |
571 |
if (a6 < .999) |
572 |
d = c_cmaterial->rd/(1. - c_cmaterial->rs)/(1. - a6); |
573 |
else |
574 |
d = c_cmaterial->td + ts; |
575 |
scalecolor(radrgb, d); |
576 |
fprintf(matfp, "\nvoid trans %s\n0\n0\n", mname); |
577 |
fprintf(matfp, "7 %f %f %f\n", colval(radrgb,RED), |
578 |
colval(radrgb,GRN), colval(radrgb,BLU)); |
579 |
fprintf(matfp, "\t%f %f %f %f\n", c_cmaterial->rs, a5, a6, |
580 |
ts/(ts + c_cmaterial->td)); |
581 |
return(mname); |
582 |
} |
583 |
/* check for plastic */ |
584 |
if (c_cmaterial->rs < .1) { |
585 |
cvtcolor(radrgb, &c_cmaterial->rd_c, |
586 |
c_cmaterial->rd/(1.-c_cmaterial->rs)); |
587 |
fprintf(matfp, "\nvoid plastic %s\n0\n0\n", mname); |
588 |
fprintf(matfp, "5 %f %f %f %f %f\n", colval(radrgb,RED), |
589 |
colval(radrgb,GRN), colval(radrgb,BLU), |
590 |
c_cmaterial->rs, c_cmaterial->rs_a); |
591 |
return(mname); |
592 |
} |
593 |
/* else it's metal */ |
594 |
/* average colors */ |
595 |
cvtcolor(radrgb, &c_cmaterial->rd_c, c_cmaterial->rd); |
596 |
cvtcolor(c2, &c_cmaterial->rs_c, c_cmaterial->rs); |
597 |
addcolor(radrgb, c2); |
598 |
fprintf(matfp, "\nvoid metal %s\n0\n0\n", mname); |
599 |
fprintf(matfp, "5 %f %f %f %f %f\n", colval(radrgb,RED), |
600 |
colval(radrgb,GRN), colval(radrgb,BLU), |
601 |
c_cmaterial->rs/(c_cmaterial->rd + c_cmaterial->rs), |
602 |
c_cmaterial->rs_a); |
603 |
return(mname); |
604 |
} |
605 |
|
606 |
|
607 |
void |
608 |
cvtcolor( /* convert a CIE XYZ color to RGB */ |
609 |
COLOR radrgb, |
610 |
register C_COLOR *ciec, |
611 |
double intensity |
612 |
) |
613 |
{ |
614 |
static COLOR ciexyz; |
615 |
|
616 |
c_ccvt(ciec, C_CSXY); /* get xy representation */ |
617 |
ciexyz[1] = intensity; |
618 |
ciexyz[0] = ciec->cx/ciec->cy*ciexyz[1]; |
619 |
ciexyz[2] = ciexyz[1]*(1./ciec->cy - 1.) - ciexyz[0]; |
620 |
cie_rgb(radrgb, ciexyz); |
621 |
} |
622 |
|
623 |
|
624 |
char * |
625 |
object(void) /* return current object name */ |
626 |
{ |
627 |
static char objbuf[64]; |
628 |
register int i; |
629 |
register char *cp; |
630 |
int len; |
631 |
/* tracked by obj_handler */ |
632 |
i = obj_nnames - sizeof(objbuf)/16; |
633 |
if (i < 0) |
634 |
i = 0; |
635 |
for (cp = objbuf; i < obj_nnames && |
636 |
cp + (len=strlen(obj_name[i])) < objbuf+sizeof(objbuf)-1; |
637 |
i++, *cp++ = '.') { |
638 |
strcpy(cp, obj_name[i]); |
639 |
cp += len; |
640 |
} |
641 |
*cp = '\0'; |
642 |
return(objbuf); |
643 |
} |
644 |
|
645 |
|
646 |
char * |
647 |
addarg( /* add argument and advance pointer */ |
648 |
register char *op, |
649 |
register char *arg |
650 |
) |
651 |
{ |
652 |
*op = ' '; |
653 |
while ( (*++op = *arg++) ) |
654 |
; |
655 |
return(op); |
656 |
} |