1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: rtrace.c,v 2.45 2005/06/10 16:49:42 greg Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* rtrace.c - program and variables for individual ray tracing. |
6 |
*/ |
7 |
|
8 |
#include "copyright.h" |
9 |
|
10 |
/* |
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* Input is in the form: |
12 |
* |
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* xorg yorg zorg xdir ydir zdir |
14 |
* |
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* The direction need not be normalized. Output is flexible. |
16 |
* If the direction vector is (0,0,0), then the output is flushed. |
17 |
* All values default to ascii representation of real |
18 |
* numbers. Binary representations can be selected |
19 |
* with '-ff' for float or '-fd' for double. By default, |
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* radiance is computed. The '-i' or '-I' options indicate that |
21 |
* irradiance values are desired. |
22 |
*/ |
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|
24 |
#include <time.h> |
25 |
|
26 |
#include "platform.h" |
27 |
#include "ray.h" |
28 |
#include "ambient.h" |
29 |
#include "source.h" |
30 |
#include "otypes.h" |
31 |
#include "resolu.h" |
32 |
|
33 |
CUBE thescene; /* our scene */ |
34 |
OBJECT nsceneobjs; /* number of objects in our scene */ |
35 |
|
36 |
int dimlist[MAXDIM]; /* sampling dimensions */ |
37 |
int ndims = 0; /* number of sampling dimensions */ |
38 |
int samplendx = 0; /* index for this sample */ |
39 |
|
40 |
int imm_irrad = 0; /* compute immediate irradiance? */ |
41 |
int lim_dist = 0; /* limit distance? */ |
42 |
|
43 |
int inform = 'a'; /* input format */ |
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int outform = 'a'; /* output format */ |
45 |
char *outvals = "v"; /* output specification */ |
46 |
|
47 |
int do_irrad = 0; /* compute irradiance? */ |
48 |
|
49 |
void (*trace)() = NULL; /* trace call */ |
50 |
|
51 |
char *tralist[128]; /* list of modifers to trace (or no) */ |
52 |
int traincl = -1; /* include == 1, exclude == 0 */ |
53 |
#ifndef MAXTSET |
54 |
#define MAXTSET 1024 /* maximum number in trace set */ |
55 |
#endif |
56 |
OBJECT traset[MAXTSET+1]={0}; /* trace include/exclude set */ |
57 |
|
58 |
int hresolu = 0; /* horizontal (scan) size */ |
59 |
int vresolu = 0; /* vertical resolution */ |
60 |
|
61 |
double dstrsrc = 0.0; /* square source distribution */ |
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double shadthresh = .03; /* shadow threshold */ |
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double shadcert = .75; /* shadow certainty */ |
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int directrelay = 2; /* number of source relays */ |
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int vspretest = 512; /* virtual source pretest density */ |
66 |
int directvis = 1; /* sources visible? */ |
67 |
double srcsizerat = .2; /* maximum ratio source size/dist. */ |
68 |
|
69 |
COLOR cextinction = BLKCOLOR; /* global extinction coefficient */ |
70 |
COLOR salbedo = BLKCOLOR; /* global scattering albedo */ |
71 |
double seccg = 0.; /* global scattering eccentricity */ |
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double ssampdist = 0.; /* scatter sampling distance */ |
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|
74 |
double specthresh = .15; /* specular sampling threshold */ |
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double specjitter = 1.; /* specular sampling jitter */ |
76 |
|
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int backvis = 1; /* back face visibility */ |
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|
79 |
int maxdepth = -10; /* maximum recursion depth */ |
80 |
double minweight = 2e-3; /* minimum ray weight */ |
81 |
|
82 |
char *ambfile = NULL; /* ambient file name */ |
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COLOR ambval = BLKCOLOR; /* ambient value */ |
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int ambvwt = 0; /* initial weight for ambient value */ |
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double ambacc = 0.15; /* ambient accuracy */ |
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int ambres = 256; /* ambient resolution */ |
87 |
int ambdiv = 1024; /* ambient divisions */ |
88 |
int ambssamp = 512; /* ambient super-samples */ |
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int ambounce = 0; /* ambient bounces */ |
90 |
char *amblist[AMBLLEN]; /* ambient include/exclude list */ |
91 |
int ambincl = -1; /* include == 1, exclude == 0 */ |
92 |
|
93 |
static int castonly = 0; |
94 |
|
95 |
static RAY thisray; /* for our convenience */ |
96 |
|
97 |
typedef void putf_t(double v); |
98 |
static putf_t puta, putd, putf; |
99 |
|
100 |
typedef void oputf_t(RAY *r); |
101 |
static oputf_t oputo, oputd, oputv, oputl, oputL, oputc, oputp, |
102 |
oputn, oputN, oputs, oputw, oputW, oputm, oputM, oputtilde; |
103 |
|
104 |
static void setoutput(char *vs); |
105 |
static void tranotify(OBJECT obj); |
106 |
static void bogusray(void); |
107 |
static void rad(FVECT org, FVECT dir, double dmax); |
108 |
static void irrad(FVECT org, FVECT dir); |
109 |
static void printvals(RAY *r); |
110 |
static int getvec(FVECT vec, int fmt, FILE *fp); |
111 |
static void tabin(RAY *r); |
112 |
static void ourtrace(RAY *r); |
113 |
|
114 |
static oputf_t *ray_out[16], *every_out[16]; |
115 |
static putf_t *putreal; |
116 |
|
117 |
void (*addobjnotify[])() = {ambnotify, tranotify, NULL}; |
118 |
|
119 |
|
120 |
void |
121 |
quit( /* quit program */ |
122 |
int code |
123 |
) |
124 |
{ |
125 |
#ifndef NON_POSIX /* XXX we don't clean up elsewhere? */ |
126 |
headclean(); /* delete header file */ |
127 |
pfclean(); /* clean up persist files */ |
128 |
#endif |
129 |
exit(code); |
130 |
} |
131 |
|
132 |
|
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extern char * |
134 |
formstr( /* return format identifier */ |
135 |
int f |
136 |
) |
137 |
{ |
138 |
switch (f) { |
139 |
case 'a': return("ascii"); |
140 |
case 'f': return("float"); |
141 |
case 'd': return("double"); |
142 |
case 'c': return(COLRFMT); |
143 |
} |
144 |
return("unknown"); |
145 |
} |
146 |
|
147 |
|
148 |
extern void |
149 |
rtrace( /* trace rays from file */ |
150 |
char *fname |
151 |
) |
152 |
{ |
153 |
unsigned long vcount = (hresolu > 1) ? (unsigned long)hresolu*vresolu |
154 |
: vresolu; |
155 |
long nextflush = hresolu; |
156 |
FILE *fp; |
157 |
double d; |
158 |
FVECT orig, direc; |
159 |
/* set up input */ |
160 |
if (fname == NULL) |
161 |
fp = stdin; |
162 |
else if ((fp = fopen(fname, "r")) == NULL) { |
163 |
sprintf(errmsg, "cannot open input file \"%s\"", fname); |
164 |
error(SYSTEM, errmsg); |
165 |
} |
166 |
if (inform != 'a') |
167 |
SET_FILE_BINARY(fp); |
168 |
/* set up output */ |
169 |
setoutput(outvals); |
170 |
switch (outform) { |
171 |
case 'a': putreal = puta; break; |
172 |
case 'f': putreal = putf; break; |
173 |
case 'd': putreal = putd; break; |
174 |
case 'c': |
175 |
if (strcmp(outvals, "v")) |
176 |
error(USER, "color format with value output only"); |
177 |
break; |
178 |
default: |
179 |
error(CONSISTENCY, "botched output format"); |
180 |
} |
181 |
if (hresolu > 0) { |
182 |
if (vresolu > 0) |
183 |
fprtresolu(hresolu, vresolu, stdout); |
184 |
fflush(stdout); |
185 |
} |
186 |
/* process file */ |
187 |
while (getvec(orig, inform, fp) == 0 && |
188 |
getvec(direc, inform, fp) == 0) { |
189 |
|
190 |
d = normalize(direc); |
191 |
if (d == 0.0) { /* zero ==> flush */ |
192 |
bogusray(); |
193 |
if (--nextflush <= 0 || !vcount) { |
194 |
fflush(stdout); |
195 |
nextflush = hresolu; |
196 |
} |
197 |
} else { |
198 |
samplendx++; |
199 |
/* compute and print */ |
200 |
if (imm_irrad) |
201 |
irrad(orig, direc); |
202 |
else |
203 |
rad(orig, direc, lim_dist ? d : 0.0); |
204 |
/* flush if time */ |
205 |
if (!--nextflush) { |
206 |
fflush(stdout); |
207 |
nextflush = hresolu; |
208 |
} |
209 |
} |
210 |
if (ferror(stdout)) |
211 |
error(SYSTEM, "write error"); |
212 |
if (vcount && !--vcount) /* check for end */ |
213 |
break; |
214 |
} |
215 |
fflush(stdout); |
216 |
if (vcount) |
217 |
error(USER, "unexpected EOF on input"); |
218 |
if (fname != NULL) |
219 |
fclose(fp); |
220 |
} |
221 |
|
222 |
|
223 |
static void |
224 |
trace_sources(void) /* trace rays to light sources, also */ |
225 |
{ |
226 |
int sn; |
227 |
|
228 |
for (sn = 0; sn < nsources; sn++) |
229 |
source[sn].sflags |= SFOLLOW; |
230 |
} |
231 |
|
232 |
|
233 |
static void |
234 |
setoutput( /* set up output tables */ |
235 |
register char *vs |
236 |
) |
237 |
{ |
238 |
register oputf_t **table = ray_out; |
239 |
|
240 |
castonly = 1; |
241 |
while (*vs) |
242 |
switch (*vs++) { |
243 |
case 'T': /* trace sources */ |
244 |
if (!*vs) break; |
245 |
trace_sources(); |
246 |
/* fall through */ |
247 |
case 't': /* trace */ |
248 |
if (!*vs) break; |
249 |
*table = NULL; |
250 |
table = every_out; |
251 |
trace = ourtrace; |
252 |
castonly = 0; |
253 |
break; |
254 |
case 'o': /* origin */ |
255 |
*table++ = oputo; |
256 |
break; |
257 |
case 'd': /* direction */ |
258 |
*table++ = oputd; |
259 |
break; |
260 |
case 'v': /* value */ |
261 |
*table++ = oputv; |
262 |
castonly = 0; |
263 |
break; |
264 |
case 'l': /* effective distance */ |
265 |
*table++ = oputl; |
266 |
castonly = 0; |
267 |
break; |
268 |
case 'c': /* local coordinates */ |
269 |
*table++ = oputc; |
270 |
break; |
271 |
case 'L': /* single ray length */ |
272 |
*table++ = oputL; |
273 |
break; |
274 |
case 'p': /* point */ |
275 |
*table++ = oputp; |
276 |
break; |
277 |
case 'n': /* perturbed normal */ |
278 |
*table++ = oputn; |
279 |
castonly = 0; |
280 |
break; |
281 |
case 'N': /* unperturbed normal */ |
282 |
*table++ = oputN; |
283 |
break; |
284 |
case 's': /* surface */ |
285 |
*table++ = oputs; |
286 |
break; |
287 |
case 'w': /* weight */ |
288 |
*table++ = oputw; |
289 |
break; |
290 |
case 'W': /* coefficient */ |
291 |
*table++ = oputW; |
292 |
if (ambounce > 0 && (ambacc > FTINY || ambssamp > 0)) |
293 |
error(WARNING, |
294 |
"-otW accuracy depends on -aa 0 -as 0"); |
295 |
break; |
296 |
case 'm': /* modifier */ |
297 |
*table++ = oputm; |
298 |
break; |
299 |
case 'M': /* material */ |
300 |
*table++ = oputM; |
301 |
break; |
302 |
case '~': /* tilde */ |
303 |
*table++ = oputtilde; |
304 |
break; |
305 |
} |
306 |
*table = NULL; |
307 |
} |
308 |
|
309 |
|
310 |
static void |
311 |
bogusray(void) /* print out empty record */ |
312 |
{ |
313 |
thisray.rorg[0] = thisray.rorg[1] = thisray.rorg[2] = |
314 |
thisray.rdir[0] = thisray.rdir[1] = thisray.rdir[2] = 0.0; |
315 |
thisray.rmax = 0.0; |
316 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
317 |
printvals(&thisray); |
318 |
} |
319 |
|
320 |
|
321 |
static void |
322 |
rad( /* compute and print ray value(s) */ |
323 |
FVECT org, |
324 |
FVECT dir, |
325 |
double dmax |
326 |
) |
327 |
{ |
328 |
VCOPY(thisray.rorg, org); |
329 |
VCOPY(thisray.rdir, dir); |
330 |
thisray.rmax = dmax; |
331 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
332 |
if (castonly) { |
333 |
if (!localhit(&thisray, &thescene)) { |
334 |
if (thisray.ro == &Aftplane) { /* clipped */ |
335 |
thisray.ro = NULL; |
336 |
thisray.rot = FHUGE; |
337 |
} else |
338 |
sourcehit(&thisray); |
339 |
} |
340 |
} else |
341 |
rayvalue(&thisray); |
342 |
printvals(&thisray); |
343 |
} |
344 |
|
345 |
|
346 |
static void |
347 |
irrad( /* compute immediate irradiance value */ |
348 |
FVECT org, |
349 |
FVECT dir |
350 |
) |
351 |
{ |
352 |
register int i; |
353 |
|
354 |
for (i = 0; i < 3; i++) { |
355 |
thisray.rorg[i] = org[i] + dir[i]; |
356 |
thisray.rdir[i] = -dir[i]; |
357 |
} |
358 |
thisray.rmax = 0.0; |
359 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
360 |
/* pretend we hit surface */ |
361 |
thisray.rot = 1.0-1e-4; |
362 |
thisray.rod = 1.0; |
363 |
VCOPY(thisray.ron, dir); |
364 |
for (i = 0; i < 3; i++) /* fudge factor */ |
365 |
thisray.rop[i] = org[i] + 1e-4*dir[i]; |
366 |
/* compute and print */ |
367 |
(*ofun[Lamb.otype].funp)(&Lamb, &thisray); |
368 |
printvals(&thisray); |
369 |
} |
370 |
|
371 |
|
372 |
static void |
373 |
printvals( /* print requested ray values */ |
374 |
RAY *r |
375 |
) |
376 |
{ |
377 |
register oputf_t **tp; |
378 |
|
379 |
if (ray_out[0] == NULL) |
380 |
return; |
381 |
for (tp = ray_out; *tp != NULL; tp++) |
382 |
(**tp)(r); |
383 |
if (outform == 'a') |
384 |
putchar('\n'); |
385 |
} |
386 |
|
387 |
|
388 |
static int |
389 |
getvec( /* get a vector from fp */ |
390 |
register FVECT vec, |
391 |
int fmt, |
392 |
FILE *fp |
393 |
) |
394 |
{ |
395 |
static float vf[3]; |
396 |
static double vd[3]; |
397 |
char buf[32]; |
398 |
register int i; |
399 |
|
400 |
switch (fmt) { |
401 |
case 'a': /* ascii */ |
402 |
for (i = 0; i < 3; i++) { |
403 |
if (fgetword(buf, sizeof(buf), fp) == NULL || |
404 |
!isflt(buf)) |
405 |
return(-1); |
406 |
vec[i] = atof(buf); |
407 |
} |
408 |
break; |
409 |
case 'f': /* binary float */ |
410 |
if (fread((char *)vf, sizeof(float), 3, fp) != 3) |
411 |
return(-1); |
412 |
vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2]; |
413 |
break; |
414 |
case 'd': /* binary double */ |
415 |
if (fread((char *)vd, sizeof(double), 3, fp) != 3) |
416 |
return(-1); |
417 |
vec[0] = vd[0]; vec[1] = vd[1]; vec[2] = vd[2]; |
418 |
break; |
419 |
default: |
420 |
error(CONSISTENCY, "botched input format"); |
421 |
} |
422 |
return(0); |
423 |
} |
424 |
|
425 |
|
426 |
static void |
427 |
tranotify( /* record new modifier */ |
428 |
OBJECT obj |
429 |
) |
430 |
{ |
431 |
static int hitlimit = 0; |
432 |
register OBJREC *o = objptr(obj); |
433 |
register char **tralp; |
434 |
|
435 |
if (obj == OVOID) { /* starting over */ |
436 |
traset[0] = 0; |
437 |
hitlimit = 0; |
438 |
return; |
439 |
} |
440 |
if (hitlimit || !ismodifier(o->otype)) |
441 |
return; |
442 |
for (tralp = tralist; *tralp != NULL; tralp++) |
443 |
if (!strcmp(o->oname, *tralp)) { |
444 |
if (traset[0] >= MAXTSET) { |
445 |
error(WARNING, "too many modifiers in trace list"); |
446 |
hitlimit++; |
447 |
return; /* should this be fatal? */ |
448 |
} |
449 |
insertelem(traset, obj); |
450 |
return; |
451 |
} |
452 |
} |
453 |
|
454 |
|
455 |
static void |
456 |
ourtrace( /* print ray values */ |
457 |
RAY *r |
458 |
) |
459 |
{ |
460 |
register oputf_t **tp; |
461 |
|
462 |
if (every_out[0] == NULL) |
463 |
return; |
464 |
if (r->ro == NULL) { |
465 |
if (traincl == 1) |
466 |
return; |
467 |
} else if (traincl != -1 && traincl != inset(traset, r->ro->omod)) |
468 |
return; |
469 |
tabin(r); |
470 |
for (tp = every_out; *tp != NULL; tp++) |
471 |
(**tp)(r); |
472 |
if (outform == 'a') |
473 |
putchar('\n'); |
474 |
} |
475 |
|
476 |
|
477 |
static void |
478 |
tabin( /* tab in appropriate amount */ |
479 |
RAY *r |
480 |
) |
481 |
{ |
482 |
const RAY *rp; |
483 |
|
484 |
for (rp = r->parent; rp != NULL; rp = rp->parent) |
485 |
putchar('\t'); |
486 |
} |
487 |
|
488 |
|
489 |
static void |
490 |
oputo( /* print origin */ |
491 |
RAY *r |
492 |
) |
493 |
{ |
494 |
(*putreal)(r->rorg[0]); |
495 |
(*putreal)(r->rorg[1]); |
496 |
(*putreal)(r->rorg[2]); |
497 |
} |
498 |
|
499 |
|
500 |
static void |
501 |
oputd( /* print direction */ |
502 |
RAY *r |
503 |
) |
504 |
{ |
505 |
(*putreal)(r->rdir[0]); |
506 |
(*putreal)(r->rdir[1]); |
507 |
(*putreal)(r->rdir[2]); |
508 |
} |
509 |
|
510 |
|
511 |
static void |
512 |
oputv( /* print value */ |
513 |
RAY *r |
514 |
) |
515 |
{ |
516 |
if (outform == 'c') { |
517 |
COLR cout; |
518 |
setcolr(cout, colval(r->rcol,RED), |
519 |
colval(r->rcol,GRN), |
520 |
colval(r->rcol,BLU)); |
521 |
fwrite((char *)cout, sizeof(cout), 1, stdout); |
522 |
return; |
523 |
} |
524 |
(*putreal)(colval(r->rcol,RED)); |
525 |
(*putreal)(colval(r->rcol,GRN)); |
526 |
(*putreal)(colval(r->rcol,BLU)); |
527 |
} |
528 |
|
529 |
|
530 |
static void |
531 |
oputl( /* print effective distance */ |
532 |
RAY *r |
533 |
) |
534 |
{ |
535 |
(*putreal)(r->rt); |
536 |
} |
537 |
|
538 |
|
539 |
static void |
540 |
oputL( /* print single ray length */ |
541 |
RAY *r |
542 |
) |
543 |
{ |
544 |
(*putreal)(r->rot); |
545 |
} |
546 |
|
547 |
|
548 |
static void |
549 |
oputc( /* print local coordinates */ |
550 |
RAY *r |
551 |
) |
552 |
{ |
553 |
(*putreal)(r->uv[0]); |
554 |
(*putreal)(r->uv[1]); |
555 |
} |
556 |
|
557 |
|
558 |
static void |
559 |
oputp( /* print point */ |
560 |
RAY *r |
561 |
) |
562 |
{ |
563 |
if (r->rot < FHUGE) { |
564 |
(*putreal)(r->rop[0]); |
565 |
(*putreal)(r->rop[1]); |
566 |
(*putreal)(r->rop[2]); |
567 |
} else { |
568 |
(*putreal)(0.0); |
569 |
(*putreal)(0.0); |
570 |
(*putreal)(0.0); |
571 |
} |
572 |
} |
573 |
|
574 |
|
575 |
static void |
576 |
oputN( /* print unperturbed normal */ |
577 |
RAY *r |
578 |
) |
579 |
{ |
580 |
if (r->rot < FHUGE) { |
581 |
(*putreal)(r->ron[0]); |
582 |
(*putreal)(r->ron[1]); |
583 |
(*putreal)(r->ron[2]); |
584 |
} else { |
585 |
(*putreal)(0.0); |
586 |
(*putreal)(0.0); |
587 |
(*putreal)(0.0); |
588 |
} |
589 |
} |
590 |
|
591 |
|
592 |
static void |
593 |
oputn( /* print perturbed normal */ |
594 |
RAY *r |
595 |
) |
596 |
{ |
597 |
FVECT pnorm; |
598 |
|
599 |
if (r->rot >= FHUGE) { |
600 |
(*putreal)(0.0); |
601 |
(*putreal)(0.0); |
602 |
(*putreal)(0.0); |
603 |
return; |
604 |
} |
605 |
raynormal(pnorm, r); |
606 |
(*putreal)(pnorm[0]); |
607 |
(*putreal)(pnorm[1]); |
608 |
(*putreal)(pnorm[2]); |
609 |
} |
610 |
|
611 |
|
612 |
static void |
613 |
oputs( /* print name */ |
614 |
RAY *r |
615 |
) |
616 |
{ |
617 |
if (r->ro != NULL) |
618 |
fputs(r->ro->oname, stdout); |
619 |
else |
620 |
putchar('*'); |
621 |
putchar('\t'); |
622 |
} |
623 |
|
624 |
|
625 |
static void |
626 |
oputw( /* print weight */ |
627 |
RAY *r |
628 |
) |
629 |
{ |
630 |
(*putreal)(r->rweight); |
631 |
} |
632 |
|
633 |
|
634 |
static void |
635 |
oputW( /* print contribution */ |
636 |
RAY *r |
637 |
) |
638 |
{ |
639 |
COLOR contr; |
640 |
|
641 |
raycontrib(contr, r, PRIMARY); |
642 |
(*putreal)(colval(contr,RED)); |
643 |
(*putreal)(colval(contr,GRN)); |
644 |
(*putreal)(colval(contr,BLU)); |
645 |
} |
646 |
|
647 |
|
648 |
static void |
649 |
oputm( /* print modifier */ |
650 |
RAY *r |
651 |
) |
652 |
{ |
653 |
if (r->ro != NULL) |
654 |
if (r->ro->omod != OVOID) |
655 |
fputs(objptr(r->ro->omod)->oname, stdout); |
656 |
else |
657 |
fputs(VOIDID, stdout); |
658 |
else |
659 |
putchar('*'); |
660 |
putchar('\t'); |
661 |
} |
662 |
|
663 |
|
664 |
static void |
665 |
oputM( /* print material */ |
666 |
RAY *r |
667 |
) |
668 |
{ |
669 |
OBJREC *mat; |
670 |
|
671 |
if (r->ro != NULL) { |
672 |
if ((mat = findmaterial(r->ro)) != NULL) |
673 |
fputs(mat->oname, stdout); |
674 |
else |
675 |
fputs(VOIDID, stdout); |
676 |
} else |
677 |
putchar('*'); |
678 |
putchar('\t'); |
679 |
} |
680 |
|
681 |
|
682 |
static void |
683 |
oputtilde( /* output tilde (spacer) */ |
684 |
RAY *r |
685 |
) |
686 |
{ |
687 |
fputs("~\t", stdout); |
688 |
} |
689 |
|
690 |
|
691 |
static void |
692 |
puta( /* print ascii value */ |
693 |
double v |
694 |
) |
695 |
{ |
696 |
printf("%e\t", v); |
697 |
} |
698 |
|
699 |
|
700 |
static void |
701 |
putd(v) /* print binary double */ |
702 |
double v; |
703 |
{ |
704 |
fwrite((char *)&v, sizeof(v), 1, stdout); |
705 |
} |
706 |
|
707 |
|
708 |
static void |
709 |
putf(v) /* print binary float */ |
710 |
double v; |
711 |
{ |
712 |
float f = v; |
713 |
|
714 |
fwrite((char *)&f, sizeof(f), 1, stdout); |
715 |
} |