1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: rtrace.c,v 2.49 2005/09/19 11:30:10 schorsch Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* rtrace.c - program and variables for individual ray tracing. |
6 |
*/ |
7 |
|
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#include "copyright.h" |
9 |
|
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/* |
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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. |
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* 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" |
30 |
#include "otypes.h" |
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#include "resolu.h" |
32 |
#include "random.h" |
33 |
|
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CUBE thescene; /* our scene */ |
35 |
OBJECT nsceneobjs; /* number of objects in our scene */ |
36 |
|
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int dimlist[MAXDIM]; /* sampling dimensions */ |
38 |
int ndims = 0; /* number of sampling dimensions */ |
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int samplendx = 0; /* index for this sample */ |
40 |
|
41 |
int imm_irrad = 0; /* compute immediate irradiance? */ |
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int lim_dist = 0; /* limit distance? */ |
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|
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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 */ |
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|
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int do_irrad = 0; /* compute irradiance? */ |
49 |
|
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int rand_samp = 0; /* pure Monte Carlo sampling? */ |
51 |
|
52 |
void (*trace)() = NULL; /* trace call */ |
53 |
|
54 |
char *tralist[128]; /* list of modifers to trace (or no) */ |
55 |
int traincl = -1; /* include == 1, exclude == 0 */ |
56 |
#ifndef MAXTSET |
57 |
#define MAXTSET 1024 /* maximum number in trace set */ |
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#endif |
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OBJECT traset[MAXTSET+1]={0}; /* trace include/exclude set */ |
60 |
|
61 |
int hresolu = 0; /* horizontal (scan) size */ |
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int vresolu = 0; /* vertical resolution */ |
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|
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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. */ |
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|
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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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|
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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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|
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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 */ |
94 |
int ambincl = -1; /* include == 1, exclude == 0 */ |
95 |
|
96 |
static int castonly = 0; |
97 |
|
98 |
static RAY thisray; /* for our convenience */ |
99 |
|
100 |
typedef void putf_t(double v); |
101 |
static putf_t puta, putd, putf; |
102 |
|
103 |
typedef void oputf_t(RAY *r); |
104 |
static oputf_t oputo, oputd, oputv, oputl, oputL, oputc, oputp, |
105 |
oputn, oputN, oputs, oputw, oputW, oputm, oputM, oputtilde; |
106 |
|
107 |
static void setoutput(char *vs); |
108 |
static void tranotify(OBJECT obj); |
109 |
static void bogusray(void); |
110 |
static void rad(FVECT org, FVECT dir, double dmax); |
111 |
static void irrad(FVECT org, FVECT dir); |
112 |
static void printvals(RAY *r); |
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static int getvec(FVECT vec, int fmt, FILE *fp); |
114 |
static void tabin(RAY *r); |
115 |
static void ourtrace(RAY *r); |
116 |
|
117 |
static oputf_t *ray_out[16], *every_out[16]; |
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static putf_t *putreal; |
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|
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void (*addobjnotify[])() = {ambnotify, tranotify, NULL}; |
121 |
|
122 |
|
123 |
void |
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quit( /* quit program */ |
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int code |
126 |
) |
127 |
{ |
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#ifndef NON_POSIX /* XXX we don't clean up elsewhere? */ |
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headclean(); /* delete header file */ |
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pfclean(); /* clean up persist files */ |
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#endif |
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exit(code); |
133 |
} |
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|
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|
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extern char * |
137 |
formstr( /* return format identifier */ |
138 |
int f |
139 |
) |
140 |
{ |
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switch (f) { |
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case 'a': return("ascii"); |
143 |
case 'f': return("float"); |
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case 'd': return("double"); |
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case 'c': return(COLRFMT); |
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} |
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return("unknown"); |
148 |
} |
149 |
|
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|
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extern void |
152 |
rtrace( /* trace rays from file */ |
153 |
char *fname |
154 |
) |
155 |
{ |
156 |
unsigned long vcount = (hresolu > 1) ? (unsigned long)hresolu*vresolu |
157 |
: vresolu; |
158 |
long nextflush = hresolu; |
159 |
FILE *fp; |
160 |
double d; |
161 |
FVECT orig, direc; |
162 |
/* set up input */ |
163 |
if (fname == NULL) |
164 |
fp = stdin; |
165 |
else if ((fp = fopen(fname, "r")) == NULL) { |
166 |
sprintf(errmsg, "cannot open input file \"%s\"", fname); |
167 |
error(SYSTEM, errmsg); |
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} |
169 |
if (inform != 'a') |
170 |
SET_FILE_BINARY(fp); |
171 |
/* set up output */ |
172 |
setoutput(outvals); |
173 |
switch (outform) { |
174 |
case 'a': putreal = puta; break; |
175 |
case 'f': putreal = putf; break; |
176 |
case 'd': putreal = putd; break; |
177 |
case 'c': |
178 |
if (strcmp(outvals, "v")) |
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error(USER, "color format with value output only"); |
180 |
break; |
181 |
default: |
182 |
error(CONSISTENCY, "botched output format"); |
183 |
} |
184 |
if (hresolu > 0) { |
185 |
if (vresolu > 0) |
186 |
fprtresolu(hresolu, vresolu, stdout); |
187 |
fflush(stdout); |
188 |
} |
189 |
/* process file */ |
190 |
while (getvec(orig, inform, fp) == 0 && |
191 |
getvec(direc, inform, fp) == 0) { |
192 |
|
193 |
d = normalize(direc); |
194 |
if (d == 0.0) { /* zero ==> flush */ |
195 |
bogusray(); |
196 |
if (--nextflush <= 0 || !vcount) { |
197 |
fflush(stdout); |
198 |
nextflush = hresolu; |
199 |
} |
200 |
} else { |
201 |
samplendx = rand_samp ? random() : samplendx+1; |
202 |
/* compute and print */ |
203 |
if (imm_irrad) |
204 |
irrad(orig, direc); |
205 |
else |
206 |
rad(orig, direc, lim_dist ? d : 0.0); |
207 |
/* flush if time */ |
208 |
if (!--nextflush) { |
209 |
fflush(stdout); |
210 |
nextflush = hresolu; |
211 |
} |
212 |
} |
213 |
if (ferror(stdout)) |
214 |
error(SYSTEM, "write error"); |
215 |
if (vcount && !--vcount) /* check for end */ |
216 |
break; |
217 |
} |
218 |
if (fflush(stdout) < 0) |
219 |
error(SYSTEM, "write error"); |
220 |
if (vcount) |
221 |
error(USER, "unexpected EOF on input"); |
222 |
if (fname != NULL) |
223 |
fclose(fp); |
224 |
} |
225 |
|
226 |
|
227 |
static void |
228 |
trace_sources(void) /* trace rays to light sources, also */ |
229 |
{ |
230 |
int sn; |
231 |
|
232 |
for (sn = 0; sn < nsources; sn++) |
233 |
source[sn].sflags |= SFOLLOW; |
234 |
} |
235 |
|
236 |
|
237 |
static void |
238 |
setoutput( /* set up output tables */ |
239 |
register char *vs |
240 |
) |
241 |
{ |
242 |
register oputf_t **table = ray_out; |
243 |
|
244 |
castonly = 1; |
245 |
while (*vs) |
246 |
switch (*vs++) { |
247 |
case 'T': /* trace sources */ |
248 |
if (!*vs) break; |
249 |
trace_sources(); |
250 |
/* fall through */ |
251 |
case 't': /* trace */ |
252 |
if (!*vs) break; |
253 |
*table = NULL; |
254 |
table = every_out; |
255 |
trace = ourtrace; |
256 |
castonly = 0; |
257 |
break; |
258 |
case 'o': /* origin */ |
259 |
*table++ = oputo; |
260 |
break; |
261 |
case 'd': /* direction */ |
262 |
*table++ = oputd; |
263 |
break; |
264 |
case 'v': /* value */ |
265 |
*table++ = oputv; |
266 |
castonly = 0; |
267 |
break; |
268 |
case 'l': /* effective distance */ |
269 |
*table++ = oputl; |
270 |
castonly = 0; |
271 |
break; |
272 |
case 'c': /* local coordinates */ |
273 |
*table++ = oputc; |
274 |
break; |
275 |
case 'L': /* single ray length */ |
276 |
*table++ = oputL; |
277 |
break; |
278 |
case 'p': /* point */ |
279 |
*table++ = oputp; |
280 |
break; |
281 |
case 'n': /* perturbed normal */ |
282 |
*table++ = oputn; |
283 |
castonly = 0; |
284 |
break; |
285 |
case 'N': /* unperturbed normal */ |
286 |
*table++ = oputN; |
287 |
break; |
288 |
case 's': /* surface */ |
289 |
*table++ = oputs; |
290 |
break; |
291 |
case 'w': /* weight */ |
292 |
*table++ = oputw; |
293 |
break; |
294 |
case 'W': /* coefficient */ |
295 |
*table++ = oputW; |
296 |
if (ambounce > 0 && (ambacc > FTINY || ambssamp > 0)) |
297 |
error(WARNING, |
298 |
"-otW accuracy depends on -aa 0 -as 0"); |
299 |
break; |
300 |
case 'm': /* modifier */ |
301 |
*table++ = oputm; |
302 |
break; |
303 |
case 'M': /* material */ |
304 |
*table++ = oputM; |
305 |
break; |
306 |
case '~': /* tilde */ |
307 |
*table++ = oputtilde; |
308 |
break; |
309 |
} |
310 |
*table = NULL; |
311 |
} |
312 |
|
313 |
|
314 |
static void |
315 |
bogusray(void) /* print out empty record */ |
316 |
{ |
317 |
thisray.rorg[0] = thisray.rorg[1] = thisray.rorg[2] = |
318 |
thisray.rdir[0] = thisray.rdir[1] = thisray.rdir[2] = 0.0; |
319 |
thisray.rmax = 0.0; |
320 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
321 |
printvals(&thisray); |
322 |
} |
323 |
|
324 |
|
325 |
static void |
326 |
rad( /* compute and print ray value(s) */ |
327 |
FVECT org, |
328 |
FVECT dir, |
329 |
double dmax |
330 |
) |
331 |
{ |
332 |
VCOPY(thisray.rorg, org); |
333 |
VCOPY(thisray.rdir, dir); |
334 |
thisray.rmax = dmax; |
335 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
336 |
if (castonly) { |
337 |
if (!localhit(&thisray, &thescene)) { |
338 |
if (thisray.ro == &Aftplane) { /* clipped */ |
339 |
thisray.ro = NULL; |
340 |
thisray.rot = FHUGE; |
341 |
} else |
342 |
sourcehit(&thisray); |
343 |
} |
344 |
} else |
345 |
rayvalue(&thisray); |
346 |
printvals(&thisray); |
347 |
} |
348 |
|
349 |
|
350 |
static void |
351 |
irrad( /* compute immediate irradiance value */ |
352 |
FVECT org, |
353 |
FVECT dir |
354 |
) |
355 |
{ |
356 |
register int i; |
357 |
|
358 |
for (i = 0; i < 3; i++) { |
359 |
thisray.rorg[i] = org[i] + dir[i]; |
360 |
thisray.rdir[i] = -dir[i]; |
361 |
} |
362 |
thisray.rmax = 0.0; |
363 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
364 |
/* pretend we hit surface */ |
365 |
thisray.rot = 1.0-1e-4; |
366 |
thisray.rod = 1.0; |
367 |
VCOPY(thisray.ron, dir); |
368 |
for (i = 0; i < 3; i++) /* fudge factor */ |
369 |
thisray.rop[i] = org[i] + 1e-4*dir[i]; |
370 |
/* compute and print */ |
371 |
(*ofun[Lamb.otype].funp)(&Lamb, &thisray); |
372 |
printvals(&thisray); |
373 |
} |
374 |
|
375 |
|
376 |
static void |
377 |
printvals( /* print requested ray values */ |
378 |
RAY *r |
379 |
) |
380 |
{ |
381 |
register oputf_t **tp; |
382 |
|
383 |
if (ray_out[0] == NULL) |
384 |
return; |
385 |
for (tp = ray_out; *tp != NULL; tp++) |
386 |
(**tp)(r); |
387 |
if (outform == 'a') |
388 |
putchar('\n'); |
389 |
} |
390 |
|
391 |
|
392 |
static int |
393 |
getvec( /* get a vector from fp */ |
394 |
register FVECT vec, |
395 |
int fmt, |
396 |
FILE *fp |
397 |
) |
398 |
{ |
399 |
static float vf[3]; |
400 |
static double vd[3]; |
401 |
char buf[32]; |
402 |
register int i; |
403 |
|
404 |
switch (fmt) { |
405 |
case 'a': /* ascii */ |
406 |
for (i = 0; i < 3; i++) { |
407 |
if (fgetword(buf, sizeof(buf), fp) == NULL || |
408 |
!isflt(buf)) |
409 |
return(-1); |
410 |
vec[i] = atof(buf); |
411 |
} |
412 |
break; |
413 |
case 'f': /* binary float */ |
414 |
if (fread((char *)vf, sizeof(float), 3, fp) != 3) |
415 |
return(-1); |
416 |
vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2]; |
417 |
break; |
418 |
case 'd': /* binary double */ |
419 |
if (fread((char *)vd, sizeof(double), 3, fp) != 3) |
420 |
return(-1); |
421 |
vec[0] = vd[0]; vec[1] = vd[1]; vec[2] = vd[2]; |
422 |
break; |
423 |
default: |
424 |
error(CONSISTENCY, "botched input format"); |
425 |
} |
426 |
return(0); |
427 |
} |
428 |
|
429 |
|
430 |
static void |
431 |
tranotify( /* record new modifier */ |
432 |
OBJECT obj |
433 |
) |
434 |
{ |
435 |
static int hitlimit = 0; |
436 |
register OBJREC *o = objptr(obj); |
437 |
register char **tralp; |
438 |
|
439 |
if (obj == OVOID) { /* starting over */ |
440 |
traset[0] = 0; |
441 |
hitlimit = 0; |
442 |
return; |
443 |
} |
444 |
if (hitlimit || !ismodifier(o->otype)) |
445 |
return; |
446 |
for (tralp = tralist; *tralp != NULL; tralp++) |
447 |
if (!strcmp(o->oname, *tralp)) { |
448 |
if (traset[0] >= MAXTSET) { |
449 |
error(WARNING, "too many modifiers in trace list"); |
450 |
hitlimit++; |
451 |
return; /* should this be fatal? */ |
452 |
} |
453 |
insertelem(traset, obj); |
454 |
return; |
455 |
} |
456 |
} |
457 |
|
458 |
|
459 |
static void |
460 |
ourtrace( /* print ray values */ |
461 |
RAY *r |
462 |
) |
463 |
{ |
464 |
register oputf_t **tp; |
465 |
|
466 |
if (every_out[0] == NULL) |
467 |
return; |
468 |
if (r->ro == NULL) { |
469 |
if (traincl == 1) |
470 |
return; |
471 |
} else if (traincl != -1 && traincl != inset(traset, r->ro->omod)) |
472 |
return; |
473 |
tabin(r); |
474 |
for (tp = every_out; *tp != NULL; tp++) |
475 |
(**tp)(r); |
476 |
if (outform == 'a') |
477 |
putchar('\n'); |
478 |
} |
479 |
|
480 |
|
481 |
static void |
482 |
tabin( /* tab in appropriate amount */ |
483 |
RAY *r |
484 |
) |
485 |
{ |
486 |
const RAY *rp; |
487 |
|
488 |
for (rp = r->parent; rp != NULL; rp = rp->parent) |
489 |
putchar('\t'); |
490 |
} |
491 |
|
492 |
|
493 |
static void |
494 |
oputo( /* print origin */ |
495 |
RAY *r |
496 |
) |
497 |
{ |
498 |
(*putreal)(r->rorg[0]); |
499 |
(*putreal)(r->rorg[1]); |
500 |
(*putreal)(r->rorg[2]); |
501 |
} |
502 |
|
503 |
|
504 |
static void |
505 |
oputd( /* print direction */ |
506 |
RAY *r |
507 |
) |
508 |
{ |
509 |
(*putreal)(r->rdir[0]); |
510 |
(*putreal)(r->rdir[1]); |
511 |
(*putreal)(r->rdir[2]); |
512 |
} |
513 |
|
514 |
|
515 |
static void |
516 |
oputv( /* print value */ |
517 |
RAY *r |
518 |
) |
519 |
{ |
520 |
if (outform == 'c') { |
521 |
COLR cout; |
522 |
setcolr(cout, colval(r->rcol,RED), |
523 |
colval(r->rcol,GRN), |
524 |
colval(r->rcol,BLU)); |
525 |
fwrite((char *)cout, sizeof(cout), 1, stdout); |
526 |
return; |
527 |
} |
528 |
(*putreal)(colval(r->rcol,RED)); |
529 |
(*putreal)(colval(r->rcol,GRN)); |
530 |
(*putreal)(colval(r->rcol,BLU)); |
531 |
} |
532 |
|
533 |
|
534 |
static void |
535 |
oputl( /* print effective distance */ |
536 |
RAY *r |
537 |
) |
538 |
{ |
539 |
(*putreal)(r->rt); |
540 |
} |
541 |
|
542 |
|
543 |
static void |
544 |
oputL( /* print single ray length */ |
545 |
RAY *r |
546 |
) |
547 |
{ |
548 |
(*putreal)(r->rot); |
549 |
} |
550 |
|
551 |
|
552 |
static void |
553 |
oputc( /* print local coordinates */ |
554 |
RAY *r |
555 |
) |
556 |
{ |
557 |
(*putreal)(r->uv[0]); |
558 |
(*putreal)(r->uv[1]); |
559 |
} |
560 |
|
561 |
|
562 |
static void |
563 |
oputp( /* print point */ |
564 |
RAY *r |
565 |
) |
566 |
{ |
567 |
if (r->rot < FHUGE) { |
568 |
(*putreal)(r->rop[0]); |
569 |
(*putreal)(r->rop[1]); |
570 |
(*putreal)(r->rop[2]); |
571 |
} else { |
572 |
(*putreal)(0.0); |
573 |
(*putreal)(0.0); |
574 |
(*putreal)(0.0); |
575 |
} |
576 |
} |
577 |
|
578 |
|
579 |
static void |
580 |
oputN( /* print unperturbed normal */ |
581 |
RAY *r |
582 |
) |
583 |
{ |
584 |
if (r->rot < FHUGE) { |
585 |
(*putreal)(r->ron[0]); |
586 |
(*putreal)(r->ron[1]); |
587 |
(*putreal)(r->ron[2]); |
588 |
} else { |
589 |
(*putreal)(0.0); |
590 |
(*putreal)(0.0); |
591 |
(*putreal)(0.0); |
592 |
} |
593 |
} |
594 |
|
595 |
|
596 |
static void |
597 |
oputn( /* print perturbed normal */ |
598 |
RAY *r |
599 |
) |
600 |
{ |
601 |
FVECT pnorm; |
602 |
|
603 |
if (r->rot >= FHUGE) { |
604 |
(*putreal)(0.0); |
605 |
(*putreal)(0.0); |
606 |
(*putreal)(0.0); |
607 |
return; |
608 |
} |
609 |
raynormal(pnorm, r); |
610 |
(*putreal)(pnorm[0]); |
611 |
(*putreal)(pnorm[1]); |
612 |
(*putreal)(pnorm[2]); |
613 |
} |
614 |
|
615 |
|
616 |
static void |
617 |
oputs( /* print name */ |
618 |
RAY *r |
619 |
) |
620 |
{ |
621 |
if (r->ro != NULL) |
622 |
fputs(r->ro->oname, stdout); |
623 |
else |
624 |
putchar('*'); |
625 |
putchar('\t'); |
626 |
} |
627 |
|
628 |
|
629 |
static void |
630 |
oputw( /* print weight */ |
631 |
RAY *r |
632 |
) |
633 |
{ |
634 |
(*putreal)(r->rweight); |
635 |
} |
636 |
|
637 |
|
638 |
static void |
639 |
oputW( /* print contribution */ |
640 |
RAY *r |
641 |
) |
642 |
{ |
643 |
double contr[3]; |
644 |
|
645 |
raycontrib(contr, r, PRIMARY); |
646 |
(*putreal)(contr[RED]); |
647 |
(*putreal)(contr[GRN]); |
648 |
(*putreal)(contr[BLU]); |
649 |
} |
650 |
|
651 |
|
652 |
static void |
653 |
oputm( /* print modifier */ |
654 |
RAY *r |
655 |
) |
656 |
{ |
657 |
if (r->ro != NULL) |
658 |
if (r->ro->omod != OVOID) |
659 |
fputs(objptr(r->ro->omod)->oname, stdout); |
660 |
else |
661 |
fputs(VOIDID, stdout); |
662 |
else |
663 |
putchar('*'); |
664 |
putchar('\t'); |
665 |
} |
666 |
|
667 |
|
668 |
static void |
669 |
oputM( /* print material */ |
670 |
RAY *r |
671 |
) |
672 |
{ |
673 |
OBJREC *mat; |
674 |
|
675 |
if (r->ro != NULL) { |
676 |
if ((mat = findmaterial(r->ro)) != NULL) |
677 |
fputs(mat->oname, stdout); |
678 |
else |
679 |
fputs(VOIDID, stdout); |
680 |
} else |
681 |
putchar('*'); |
682 |
putchar('\t'); |
683 |
} |
684 |
|
685 |
|
686 |
static void |
687 |
oputtilde( /* output tilde (spacer) */ |
688 |
RAY *r |
689 |
) |
690 |
{ |
691 |
fputs("~\t", stdout); |
692 |
} |
693 |
|
694 |
|
695 |
static void |
696 |
puta( /* print ascii value */ |
697 |
double v |
698 |
) |
699 |
{ |
700 |
printf("%e\t", v); |
701 |
} |
702 |
|
703 |
|
704 |
static void |
705 |
putd(v) /* print binary double */ |
706 |
double v; |
707 |
{ |
708 |
fwrite((char *)&v, sizeof(v), 1, stdout); |
709 |
} |
710 |
|
711 |
|
712 |
static void |
713 |
putf(v) /* print binary float */ |
714 |
double v; |
715 |
{ |
716 |
float f = v; |
717 |
|
718 |
fwrite((char *)&f, sizeof(f), 1, stdout); |
719 |
} |