1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: rtrace.c,v 2.43 2005/06/02 04:47:27 greg Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* rtrace.c - program and variables for individual ray tracing. |
6 |
*/ |
7 |
|
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#include "copyright.h" |
9 |
|
10 |
/* |
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* Input is in the form: |
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* |
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* xorg yorg zorg xdir ydir zdir |
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* |
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* The direction need not be normalized. Output is flexible. |
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* 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 |
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* with '-ff' for float or '-fd' for double. By default, |
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* radiance is computed. The '-i' or '-I' options indicate that |
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* irradiance values are desired. |
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*/ |
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|
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#include <time.h> |
25 |
|
26 |
#include "platform.h" |
27 |
#include "ray.h" |
28 |
#include "ambient.h" |
29 |
#include "source.h" |
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#include "otypes.h" |
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#include "resolu.h" |
32 |
|
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CUBE thescene; /* our scene */ |
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OBJECT nsceneobjs; /* number of objects in our scene */ |
35 |
|
36 |
int dimlist[MAXDIM]; /* sampling dimensions */ |
37 |
int ndims = 0; /* number of sampling dimensions */ |
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int samplendx = 0; /* index for this sample */ |
39 |
|
40 |
int imm_irrad = 0; /* compute immediate irradiance? */ |
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int lim_dist = 0; /* limit distance? */ |
42 |
|
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int inform = 'a'; /* input format */ |
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int outform = 'a'; /* output format */ |
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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 |
#define MAXTSET 511 /* maximum number in trace set */ |
54 |
OBJECT traset[MAXTSET+1]={0}; /* trace include/exclude set */ |
55 |
|
56 |
int hresolu = 0; /* horizontal (scan) size */ |
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int vresolu = 0; /* vertical resolution */ |
58 |
|
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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 */ |
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int directvis = 1; /* sources visible? */ |
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double srcsizerat = .2; /* maximum ratio source size/dist. */ |
66 |
|
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COLOR cextinction = BLKCOLOR; /* global extinction coefficient */ |
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COLOR salbedo = BLKCOLOR; /* global scattering albedo */ |
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double seccg = 0.; /* global scattering eccentricity */ |
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double ssampdist = 0.; /* scatter sampling distance */ |
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|
72 |
double specthresh = .15; /* specular sampling threshold */ |
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double specjitter = 1.; /* specular sampling jitter */ |
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|
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int backvis = 1; /* back face visibility */ |
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|
77 |
int maxdepth = -10; /* maximum recursion depth */ |
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double minweight = 2e-3; /* minimum ray weight */ |
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|
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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 */ |
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int ambdiv = 1024; /* ambient divisions */ |
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int ambssamp = 512; /* ambient super-samples */ |
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int ambounce = 0; /* ambient bounces */ |
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char *amblist[AMBLLEN]; /* ambient include/exclude list */ |
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int ambincl = -1; /* include == 1, exclude == 0 */ |
90 |
|
91 |
static int castonly = 0; |
92 |
|
93 |
static RAY thisray; /* for our convenience */ |
94 |
|
95 |
typedef void putf_t(double v); |
96 |
static putf_t puta, putd, putf; |
97 |
|
98 |
typedef void oputf_t(RAY *r); |
99 |
static oputf_t oputo, oputd, oputv, oputl, oputL, oputc, oputp, |
100 |
oputn, oputN, oputs, oputw, oputW, oputm, oputM, oputtilde; |
101 |
|
102 |
static void setoutput(char *vs); |
103 |
static void tranotify(OBJECT obj); |
104 |
static void bogusray(void); |
105 |
static void rad(FVECT org, FVECT dir, double dmax); |
106 |
static void irrad(FVECT org, FVECT dir); |
107 |
static void printvals(RAY *r); |
108 |
static int getvec(FVECT vec, int fmt, FILE *fp); |
109 |
static void tabin(RAY *r); |
110 |
static void ourtrace(RAY *r); |
111 |
|
112 |
static oputf_t *ray_out[16], *every_out[16]; |
113 |
static putf_t *putreal; |
114 |
|
115 |
void (*addobjnotify[])() = {ambnotify, tranotify, NULL}; |
116 |
|
117 |
|
118 |
void |
119 |
quit( /* quit program */ |
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int code |
121 |
) |
122 |
{ |
123 |
#ifndef NON_POSIX /* XXX we don't clean up elsewhere? */ |
124 |
headclean(); /* delete header file */ |
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pfclean(); /* clean up persist files */ |
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#endif |
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exit(code); |
128 |
} |
129 |
|
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|
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extern char * |
132 |
formstr( /* return format identifier */ |
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int f |
134 |
) |
135 |
{ |
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switch (f) { |
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case 'a': return("ascii"); |
138 |
case 'f': return("float"); |
139 |
case 'd': return("double"); |
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case 'c': return(COLRFMT); |
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} |
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return("unknown"); |
143 |
} |
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|
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|
146 |
extern void |
147 |
rtrace( /* trace rays from file */ |
148 |
char *fname |
149 |
) |
150 |
{ |
151 |
long vcount = hresolu>1 ? hresolu*vresolu : vresolu; |
152 |
long nextflush = hresolu; |
153 |
FILE *fp; |
154 |
double d; |
155 |
FVECT orig, direc; |
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/* set up input */ |
157 |
if (fname == NULL) |
158 |
fp = stdin; |
159 |
else if ((fp = fopen(fname, "r")) == NULL) { |
160 |
sprintf(errmsg, "cannot open input file \"%s\"", fname); |
161 |
error(SYSTEM, errmsg); |
162 |
} |
163 |
if (inform != 'a') |
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SET_FILE_BINARY(fp); |
165 |
/* set up output */ |
166 |
setoutput(outvals); |
167 |
switch (outform) { |
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case 'a': putreal = puta; break; |
169 |
case 'f': putreal = putf; break; |
170 |
case 'd': putreal = putd; break; |
171 |
case 'c': |
172 |
if (strcmp(outvals, "v")) |
173 |
error(USER, "color format with value output only"); |
174 |
break; |
175 |
default: |
176 |
error(CONSISTENCY, "botched output format"); |
177 |
} |
178 |
if (hresolu > 0) { |
179 |
if (vresolu > 0) |
180 |
fprtresolu(hresolu, vresolu, stdout); |
181 |
fflush(stdout); |
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} |
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/* process file */ |
184 |
while (getvec(orig, inform, fp) == 0 && |
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getvec(direc, inform, fp) == 0) { |
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|
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d = normalize(direc); |
188 |
if (d == 0.0) { /* zero ==> flush */ |
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bogusray(); |
190 |
if (--nextflush <= 0 || vcount <= 0) { |
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fflush(stdout); |
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nextflush = hresolu; |
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} |
194 |
} else { |
195 |
samplendx++; |
196 |
/* compute and print */ |
197 |
if (imm_irrad) |
198 |
irrad(orig, direc); |
199 |
else |
200 |
rad(orig, direc, lim_dist ? d : 0.0); |
201 |
/* flush if time */ |
202 |
if (--nextflush == 0) { |
203 |
fflush(stdout); |
204 |
nextflush = hresolu; |
205 |
} |
206 |
} |
207 |
if (ferror(stdout)) |
208 |
error(SYSTEM, "write error"); |
209 |
if (--vcount == 0) /* check for end */ |
210 |
break; |
211 |
} |
212 |
fflush(stdout); |
213 |
if (vcount > 0) |
214 |
error(USER, "unexpected EOF on input"); |
215 |
if (fname != NULL) |
216 |
fclose(fp); |
217 |
} |
218 |
|
219 |
|
220 |
static void |
221 |
trace_sources(void) /* trace rays to light sources, also */ |
222 |
{ |
223 |
int sn; |
224 |
|
225 |
for (sn = 0; sn < nsources; sn++) |
226 |
source[sn].sflags |= SFOLLOW; |
227 |
} |
228 |
|
229 |
|
230 |
static void |
231 |
setoutput( /* set up output tables */ |
232 |
register char *vs |
233 |
) |
234 |
{ |
235 |
register oputf_t **table = ray_out; |
236 |
|
237 |
castonly = 1; |
238 |
while (*vs) |
239 |
switch (*vs++) { |
240 |
case 'T': /* trace sources */ |
241 |
if (!*vs) break; |
242 |
trace_sources(); |
243 |
/* fall through */ |
244 |
case 't': /* trace */ |
245 |
if (!*vs) break; |
246 |
*table = NULL; |
247 |
table = every_out; |
248 |
trace = ourtrace; |
249 |
castonly = 0; |
250 |
break; |
251 |
case 'o': /* origin */ |
252 |
*table++ = oputo; |
253 |
break; |
254 |
case 'd': /* direction */ |
255 |
*table++ = oputd; |
256 |
break; |
257 |
case 'v': /* value */ |
258 |
*table++ = oputv; |
259 |
castonly = 0; |
260 |
break; |
261 |
case 'l': /* effective distance */ |
262 |
*table++ = oputl; |
263 |
castonly = 0; |
264 |
break; |
265 |
case 'c': /* local coordinates */ |
266 |
*table++ = oputc; |
267 |
break; |
268 |
case 'L': /* single ray length */ |
269 |
*table++ = oputL; |
270 |
break; |
271 |
case 'p': /* point */ |
272 |
*table++ = oputp; |
273 |
break; |
274 |
case 'n': /* perturbed normal */ |
275 |
*table++ = oputn; |
276 |
castonly = 0; |
277 |
break; |
278 |
case 'N': /* unperturbed normal */ |
279 |
*table++ = oputN; |
280 |
break; |
281 |
case 's': /* surface */ |
282 |
*table++ = oputs; |
283 |
break; |
284 |
case 'w': /* weight */ |
285 |
*table++ = oputw; |
286 |
break; |
287 |
case 'W': /* coefficient */ |
288 |
*table++ = oputW; |
289 |
if (ambounce > 0 && (ambacc > FTINY || ambssamp > 0)) |
290 |
error(WARNING, |
291 |
"-otW accuracy depends on -aa 0 -as 0"); |
292 |
break; |
293 |
case 'm': /* modifier */ |
294 |
*table++ = oputm; |
295 |
break; |
296 |
case 'M': /* material */ |
297 |
*table++ = oputM; |
298 |
break; |
299 |
case '~': /* tilde */ |
300 |
*table++ = oputtilde; |
301 |
break; |
302 |
} |
303 |
*table = NULL; |
304 |
} |
305 |
|
306 |
|
307 |
static void |
308 |
bogusray(void) /* print out empty record */ |
309 |
{ |
310 |
thisray.rorg[0] = thisray.rorg[1] = thisray.rorg[2] = |
311 |
thisray.rdir[0] = thisray.rdir[1] = thisray.rdir[2] = 0.0; |
312 |
thisray.rmax = 0.0; |
313 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
314 |
printvals(&thisray); |
315 |
} |
316 |
|
317 |
|
318 |
static void |
319 |
rad( /* compute and print ray value(s) */ |
320 |
FVECT org, |
321 |
FVECT dir, |
322 |
double dmax |
323 |
) |
324 |
{ |
325 |
VCOPY(thisray.rorg, org); |
326 |
VCOPY(thisray.rdir, dir); |
327 |
thisray.rmax = dmax; |
328 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
329 |
if (castonly) { |
330 |
if (!localhit(&thisray, &thescene)) { |
331 |
if (thisray.ro == &Aftplane) { /* clipped */ |
332 |
thisray.ro = NULL; |
333 |
thisray.rot = FHUGE; |
334 |
} else |
335 |
sourcehit(&thisray); |
336 |
} |
337 |
} else |
338 |
rayvalue(&thisray); |
339 |
printvals(&thisray); |
340 |
} |
341 |
|
342 |
|
343 |
static void |
344 |
irrad( /* compute immediate irradiance value */ |
345 |
FVECT org, |
346 |
FVECT dir |
347 |
) |
348 |
{ |
349 |
register int i; |
350 |
|
351 |
for (i = 0; i < 3; i++) { |
352 |
thisray.rorg[i] = org[i] + dir[i]; |
353 |
thisray.rdir[i] = -dir[i]; |
354 |
} |
355 |
thisray.rmax = 0.0; |
356 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
357 |
/* pretend we hit surface */ |
358 |
thisray.rot = 1.0-1e-4; |
359 |
thisray.rod = 1.0; |
360 |
VCOPY(thisray.ron, dir); |
361 |
for (i = 0; i < 3; i++) /* fudge factor */ |
362 |
thisray.rop[i] = org[i] + 1e-4*dir[i]; |
363 |
/* compute and print */ |
364 |
(*ofun[Lamb.otype].funp)(&Lamb, &thisray); |
365 |
printvals(&thisray); |
366 |
} |
367 |
|
368 |
|
369 |
static void |
370 |
printvals( /* print requested ray values */ |
371 |
RAY *r |
372 |
) |
373 |
{ |
374 |
register oputf_t **tp; |
375 |
|
376 |
if (ray_out[0] == NULL) |
377 |
return; |
378 |
for (tp = ray_out; *tp != NULL; tp++) |
379 |
(**tp)(r); |
380 |
if (outform == 'a') |
381 |
putchar('\n'); |
382 |
} |
383 |
|
384 |
|
385 |
static int |
386 |
getvec( /* get a vector from fp */ |
387 |
register FVECT vec, |
388 |
int fmt, |
389 |
FILE *fp |
390 |
) |
391 |
{ |
392 |
static float vf[3]; |
393 |
static double vd[3]; |
394 |
char buf[32]; |
395 |
register int i; |
396 |
|
397 |
switch (fmt) { |
398 |
case 'a': /* ascii */ |
399 |
for (i = 0; i < 3; i++) { |
400 |
if (fgetword(buf, sizeof(buf), fp) == NULL || |
401 |
!isflt(buf)) |
402 |
return(-1); |
403 |
vec[i] = atof(buf); |
404 |
} |
405 |
break; |
406 |
case 'f': /* binary float */ |
407 |
if (fread((char *)vf, sizeof(float), 3, fp) != 3) |
408 |
return(-1); |
409 |
vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2]; |
410 |
break; |
411 |
case 'd': /* binary double */ |
412 |
if (fread((char *)vd, sizeof(double), 3, fp) != 3) |
413 |
return(-1); |
414 |
vec[0] = vd[0]; vec[1] = vd[1]; vec[2] = vd[2]; |
415 |
break; |
416 |
default: |
417 |
error(CONSISTENCY, "botched input format"); |
418 |
} |
419 |
return(0); |
420 |
} |
421 |
|
422 |
|
423 |
static void |
424 |
tranotify( /* record new modifier */ |
425 |
OBJECT obj |
426 |
) |
427 |
{ |
428 |
static int hitlimit = 0; |
429 |
register OBJREC *o = objptr(obj); |
430 |
register char **tralp; |
431 |
|
432 |
if (obj == OVOID) { /* starting over */ |
433 |
traset[0] = 0; |
434 |
hitlimit = 0; |
435 |
return; |
436 |
} |
437 |
if (hitlimit || !ismodifier(o->otype)) |
438 |
return; |
439 |
for (tralp = tralist; *tralp != NULL; tralp++) |
440 |
if (!strcmp(o->oname, *tralp)) { |
441 |
if (traset[0] >= MAXTSET) { |
442 |
error(WARNING, "too many modifiers in trace list"); |
443 |
hitlimit++; |
444 |
return; /* should this be fatal? */ |
445 |
} |
446 |
insertelem(traset, obj); |
447 |
return; |
448 |
} |
449 |
} |
450 |
|
451 |
|
452 |
static void |
453 |
ourtrace( /* print ray values */ |
454 |
RAY *r |
455 |
) |
456 |
{ |
457 |
register oputf_t **tp; |
458 |
|
459 |
if (every_out[0] == NULL) |
460 |
return; |
461 |
if (r->ro == NULL) { |
462 |
if (traincl == 1) |
463 |
return; |
464 |
} else if (traincl != -1 && traincl != inset(traset, r->ro->omod)) |
465 |
return; |
466 |
tabin(r); |
467 |
for (tp = every_out; *tp != NULL; tp++) |
468 |
(**tp)(r); |
469 |
if (outform == 'a') |
470 |
putchar('\n'); |
471 |
} |
472 |
|
473 |
|
474 |
static void |
475 |
tabin( /* tab in appropriate amount */ |
476 |
RAY *r |
477 |
) |
478 |
{ |
479 |
const RAY *rp; |
480 |
|
481 |
for (rp = r->parent; rp != NULL; rp = rp->parent) |
482 |
putchar('\t'); |
483 |
} |
484 |
|
485 |
|
486 |
static void |
487 |
oputo( /* print origin */ |
488 |
RAY *r |
489 |
) |
490 |
{ |
491 |
(*putreal)(r->rorg[0]); |
492 |
(*putreal)(r->rorg[1]); |
493 |
(*putreal)(r->rorg[2]); |
494 |
} |
495 |
|
496 |
|
497 |
static void |
498 |
oputd( /* print direction */ |
499 |
RAY *r |
500 |
) |
501 |
{ |
502 |
(*putreal)(r->rdir[0]); |
503 |
(*putreal)(r->rdir[1]); |
504 |
(*putreal)(r->rdir[2]); |
505 |
} |
506 |
|
507 |
|
508 |
static void |
509 |
oputv( /* print value */ |
510 |
RAY *r |
511 |
) |
512 |
{ |
513 |
if (outform == 'c') { |
514 |
COLR cout; |
515 |
setcolr(cout, colval(r->rcol,RED), |
516 |
colval(r->rcol,GRN), |
517 |
colval(r->rcol,BLU)); |
518 |
fwrite((char *)cout, sizeof(cout), 1, stdout); |
519 |
return; |
520 |
} |
521 |
(*putreal)(colval(r->rcol,RED)); |
522 |
(*putreal)(colval(r->rcol,GRN)); |
523 |
(*putreal)(colval(r->rcol,BLU)); |
524 |
} |
525 |
|
526 |
|
527 |
static void |
528 |
oputl( /* print effective distance */ |
529 |
RAY *r |
530 |
) |
531 |
{ |
532 |
(*putreal)(r->rt); |
533 |
} |
534 |
|
535 |
|
536 |
static void |
537 |
oputL( /* print single ray length */ |
538 |
RAY *r |
539 |
) |
540 |
{ |
541 |
(*putreal)(r->rot); |
542 |
} |
543 |
|
544 |
|
545 |
static void |
546 |
oputc( /* print local coordinates */ |
547 |
RAY *r |
548 |
) |
549 |
{ |
550 |
(*putreal)(r->uv[0]); |
551 |
(*putreal)(r->uv[1]); |
552 |
} |
553 |
|
554 |
|
555 |
static void |
556 |
oputp( /* print point */ |
557 |
RAY *r |
558 |
) |
559 |
{ |
560 |
if (r->rot < FHUGE) { |
561 |
(*putreal)(r->rop[0]); |
562 |
(*putreal)(r->rop[1]); |
563 |
(*putreal)(r->rop[2]); |
564 |
} else { |
565 |
(*putreal)(0.0); |
566 |
(*putreal)(0.0); |
567 |
(*putreal)(0.0); |
568 |
} |
569 |
} |
570 |
|
571 |
|
572 |
static void |
573 |
oputN( /* print unperturbed normal */ |
574 |
RAY *r |
575 |
) |
576 |
{ |
577 |
if (r->rot < FHUGE) { |
578 |
(*putreal)(r->ron[0]); |
579 |
(*putreal)(r->ron[1]); |
580 |
(*putreal)(r->ron[2]); |
581 |
} else { |
582 |
(*putreal)(0.0); |
583 |
(*putreal)(0.0); |
584 |
(*putreal)(0.0); |
585 |
} |
586 |
} |
587 |
|
588 |
|
589 |
static void |
590 |
oputn( /* print perturbed normal */ |
591 |
RAY *r |
592 |
) |
593 |
{ |
594 |
FVECT pnorm; |
595 |
|
596 |
if (r->rot >= FHUGE) { |
597 |
(*putreal)(0.0); |
598 |
(*putreal)(0.0); |
599 |
(*putreal)(0.0); |
600 |
return; |
601 |
} |
602 |
raynormal(pnorm, r); |
603 |
(*putreal)(pnorm[0]); |
604 |
(*putreal)(pnorm[1]); |
605 |
(*putreal)(pnorm[2]); |
606 |
} |
607 |
|
608 |
|
609 |
static void |
610 |
oputs( /* print name */ |
611 |
RAY *r |
612 |
) |
613 |
{ |
614 |
if (r->ro != NULL) |
615 |
fputs(r->ro->oname, stdout); |
616 |
else |
617 |
putchar('*'); |
618 |
putchar('\t'); |
619 |
} |
620 |
|
621 |
|
622 |
static void |
623 |
oputw( /* print weight */ |
624 |
RAY *r |
625 |
) |
626 |
{ |
627 |
(*putreal)(r->rweight); |
628 |
} |
629 |
|
630 |
|
631 |
static void |
632 |
oputW( /* print contribution */ |
633 |
RAY *r |
634 |
) |
635 |
{ |
636 |
COLOR contr; |
637 |
|
638 |
raycontrib(contr, r, PRIMARY); |
639 |
(*putreal)(colval(contr,RED)); |
640 |
(*putreal)(colval(contr,GRN)); |
641 |
(*putreal)(colval(contr,BLU)); |
642 |
} |
643 |
|
644 |
|
645 |
static void |
646 |
oputm( /* print modifier */ |
647 |
RAY *r |
648 |
) |
649 |
{ |
650 |
if (r->ro != NULL) |
651 |
if (r->ro->omod != OVOID) |
652 |
fputs(objptr(r->ro->omod)->oname, stdout); |
653 |
else |
654 |
fputs(VOIDID, stdout); |
655 |
else |
656 |
putchar('*'); |
657 |
putchar('\t'); |
658 |
} |
659 |
|
660 |
|
661 |
static void |
662 |
oputM( /* print material */ |
663 |
RAY *r |
664 |
) |
665 |
{ |
666 |
OBJREC *mat; |
667 |
|
668 |
if (r->ro != NULL) { |
669 |
if ((mat = findmaterial(r->ro)) != NULL) |
670 |
fputs(mat->oname, stdout); |
671 |
else |
672 |
fputs(VOIDID, stdout); |
673 |
} else |
674 |
putchar('*'); |
675 |
putchar('\t'); |
676 |
} |
677 |
|
678 |
|
679 |
static void |
680 |
oputtilde( /* output tilde (spacer) */ |
681 |
RAY *r |
682 |
) |
683 |
{ |
684 |
fputs("~\t", stdout); |
685 |
} |
686 |
|
687 |
|
688 |
static void |
689 |
puta( /* print ascii value */ |
690 |
double v |
691 |
) |
692 |
{ |
693 |
printf("%e\t", v); |
694 |
} |
695 |
|
696 |
|
697 |
static void |
698 |
putd(v) /* print binary double */ |
699 |
double v; |
700 |
{ |
701 |
fwrite((char *)&v, sizeof(v), 1, stdout); |
702 |
} |
703 |
|
704 |
|
705 |
static void |
706 |
putf(v) /* print binary float */ |
707 |
double v; |
708 |
{ |
709 |
float f = v; |
710 |
|
711 |
fwrite((char *)&f, sizeof(f), 1, stdout); |
712 |
} |