1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: rtrace.c,v 2.47 2005/06/13 20:07:56 greg Exp $"; |
3 |
#endif |
4 |
/* |
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* 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" |
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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 |
|
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int dimlist[MAXDIM]; /* sampling dimensions */ |
37 |
int ndims = 0; /* number of sampling dimensions */ |
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int samplendx = 0; /* index for this sample */ |
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|
40 |
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? */ |
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|
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int rand_samp = 0; /* pure Monte Carlo sampling? */ |
50 |
|
51 |
void (*trace)() = NULL; /* trace call */ |
52 |
|
53 |
char *tralist[128]; /* list of modifers to trace (or no) */ |
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int traincl = -1; /* include == 1, exclude == 0 */ |
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#ifndef MAXTSET |
56 |
#define MAXTSET 1024 /* maximum number in trace set */ |
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#endif |
58 |
OBJECT traset[MAXTSET+1]={0}; /* trace include/exclude set */ |
59 |
|
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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 */ |
80 |
|
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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 */ |
93 |
int ambincl = -1; /* include == 1, exclude == 0 */ |
94 |
|
95 |
static int castonly = 0; |
96 |
|
97 |
static RAY thisray; /* for our convenience */ |
98 |
|
99 |
typedef void putf_t(double v); |
100 |
static putf_t puta, putd, putf; |
101 |
|
102 |
typedef void oputf_t(RAY *r); |
103 |
static oputf_t oputo, oputd, oputv, oputl, oputL, oputc, oputp, |
104 |
oputn, oputN, oputs, oputw, oputW, oputm, oputM, oputtilde; |
105 |
|
106 |
static void setoutput(char *vs); |
107 |
static void tranotify(OBJECT obj); |
108 |
static void bogusray(void); |
109 |
static void rad(FVECT org, FVECT dir, double dmax); |
110 |
static void irrad(FVECT org, FVECT dir); |
111 |
static void printvals(RAY *r); |
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static int getvec(FVECT vec, int fmt, FILE *fp); |
113 |
static void tabin(RAY *r); |
114 |
static void ourtrace(RAY *r); |
115 |
|
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static oputf_t *ray_out[16], *every_out[16]; |
117 |
static putf_t *putreal; |
118 |
|
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void (*addobjnotify[])() = {ambnotify, tranotify, NULL}; |
120 |
|
121 |
|
122 |
void |
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quit( /* quit program */ |
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int code |
125 |
) |
126 |
{ |
127 |
#ifndef NON_POSIX /* XXX we don't clean up elsewhere? */ |
128 |
headclean(); /* delete header file */ |
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pfclean(); /* clean up persist files */ |
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#endif |
131 |
exit(code); |
132 |
} |
133 |
|
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|
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extern char * |
136 |
formstr( /* return format identifier */ |
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int f |
138 |
) |
139 |
{ |
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switch (f) { |
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case 'a': return("ascii"); |
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case 'f': return("float"); |
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case 'd': return("double"); |
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case 'c': return(COLRFMT); |
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} |
146 |
return("unknown"); |
147 |
} |
148 |
|
149 |
|
150 |
extern void |
151 |
rtrace( /* trace rays from file */ |
152 |
char *fname |
153 |
) |
154 |
{ |
155 |
unsigned long vcount = (hresolu > 1) ? (unsigned long)hresolu*vresolu |
156 |
: vresolu; |
157 |
long nextflush = hresolu; |
158 |
FILE *fp; |
159 |
double d; |
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FVECT orig, direc; |
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/* set up input */ |
162 |
if (fname == NULL) |
163 |
fp = stdin; |
164 |
else if ((fp = fopen(fname, "r")) == NULL) { |
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sprintf(errmsg, "cannot open input file \"%s\"", fname); |
166 |
error(SYSTEM, errmsg); |
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} |
168 |
if (inform != 'a') |
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SET_FILE_BINARY(fp); |
170 |
/* set up output */ |
171 |
setoutput(outvals); |
172 |
switch (outform) { |
173 |
case 'a': putreal = puta; break; |
174 |
case 'f': putreal = putf; break; |
175 |
case 'd': putreal = putd; break; |
176 |
case 'c': |
177 |
if (strcmp(outvals, "v")) |
178 |
error(USER, "color format with value output only"); |
179 |
break; |
180 |
default: |
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error(CONSISTENCY, "botched output format"); |
182 |
} |
183 |
if (hresolu > 0) { |
184 |
if (vresolu > 0) |
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fprtresolu(hresolu, vresolu, stdout); |
186 |
fflush(stdout); |
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} |
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/* process file */ |
189 |
while (getvec(orig, inform, fp) == 0 && |
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getvec(direc, inform, fp) == 0) { |
191 |
|
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d = normalize(direc); |
193 |
if (d == 0.0) { /* zero ==> flush */ |
194 |
bogusray(); |
195 |
if (--nextflush <= 0 || !vcount) { |
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fflush(stdout); |
197 |
nextflush = hresolu; |
198 |
} |
199 |
} else { |
200 |
samplendx = rand_samp ? random() : samplendx+1; |
201 |
/* compute and print */ |
202 |
if (imm_irrad) |
203 |
irrad(orig, direc); |
204 |
else |
205 |
rad(orig, direc, lim_dist ? d : 0.0); |
206 |
/* flush if time */ |
207 |
if (!--nextflush) { |
208 |
fflush(stdout); |
209 |
nextflush = hresolu; |
210 |
} |
211 |
} |
212 |
if (ferror(stdout)) |
213 |
error(SYSTEM, "write error"); |
214 |
if (vcount && !--vcount) /* check for end */ |
215 |
break; |
216 |
} |
217 |
fflush(stdout); |
218 |
if (vcount) |
219 |
error(USER, "unexpected EOF on input"); |
220 |
if (fname != NULL) |
221 |
fclose(fp); |
222 |
} |
223 |
|
224 |
|
225 |
static void |
226 |
trace_sources(void) /* trace rays to light sources, also */ |
227 |
{ |
228 |
int sn; |
229 |
|
230 |
for (sn = 0; sn < nsources; sn++) |
231 |
source[sn].sflags |= SFOLLOW; |
232 |
} |
233 |
|
234 |
|
235 |
static void |
236 |
setoutput( /* set up output tables */ |
237 |
register char *vs |
238 |
) |
239 |
{ |
240 |
register oputf_t **table = ray_out; |
241 |
|
242 |
castonly = 1; |
243 |
while (*vs) |
244 |
switch (*vs++) { |
245 |
case 'T': /* trace sources */ |
246 |
if (!*vs) break; |
247 |
trace_sources(); |
248 |
/* fall through */ |
249 |
case 't': /* trace */ |
250 |
if (!*vs) break; |
251 |
*table = NULL; |
252 |
table = every_out; |
253 |
trace = ourtrace; |
254 |
castonly = 0; |
255 |
break; |
256 |
case 'o': /* origin */ |
257 |
*table++ = oputo; |
258 |
break; |
259 |
case 'd': /* direction */ |
260 |
*table++ = oputd; |
261 |
break; |
262 |
case 'v': /* value */ |
263 |
*table++ = oputv; |
264 |
castonly = 0; |
265 |
break; |
266 |
case 'l': /* effective distance */ |
267 |
*table++ = oputl; |
268 |
castonly = 0; |
269 |
break; |
270 |
case 'c': /* local coordinates */ |
271 |
*table++ = oputc; |
272 |
break; |
273 |
case 'L': /* single ray length */ |
274 |
*table++ = oputL; |
275 |
break; |
276 |
case 'p': /* point */ |
277 |
*table++ = oputp; |
278 |
break; |
279 |
case 'n': /* perturbed normal */ |
280 |
*table++ = oputn; |
281 |
castonly = 0; |
282 |
break; |
283 |
case 'N': /* unperturbed normal */ |
284 |
*table++ = oputN; |
285 |
break; |
286 |
case 's': /* surface */ |
287 |
*table++ = oputs; |
288 |
break; |
289 |
case 'w': /* weight */ |
290 |
*table++ = oputw; |
291 |
break; |
292 |
case 'W': /* coefficient */ |
293 |
*table++ = oputW; |
294 |
if (ambounce > 0 && (ambacc > FTINY || ambssamp > 0)) |
295 |
error(WARNING, |
296 |
"-otW accuracy depends on -aa 0 -as 0"); |
297 |
break; |
298 |
case 'm': /* modifier */ |
299 |
*table++ = oputm; |
300 |
break; |
301 |
case 'M': /* material */ |
302 |
*table++ = oputM; |
303 |
break; |
304 |
case '~': /* tilde */ |
305 |
*table++ = oputtilde; |
306 |
break; |
307 |
} |
308 |
*table = NULL; |
309 |
} |
310 |
|
311 |
|
312 |
static void |
313 |
bogusray(void) /* print out empty record */ |
314 |
{ |
315 |
thisray.rorg[0] = thisray.rorg[1] = thisray.rorg[2] = |
316 |
thisray.rdir[0] = thisray.rdir[1] = thisray.rdir[2] = 0.0; |
317 |
thisray.rmax = 0.0; |
318 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
319 |
printvals(&thisray); |
320 |
} |
321 |
|
322 |
|
323 |
static void |
324 |
rad( /* compute and print ray value(s) */ |
325 |
FVECT org, |
326 |
FVECT dir, |
327 |
double dmax |
328 |
) |
329 |
{ |
330 |
VCOPY(thisray.rorg, org); |
331 |
VCOPY(thisray.rdir, dir); |
332 |
thisray.rmax = dmax; |
333 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
334 |
if (castonly) { |
335 |
if (!localhit(&thisray, &thescene)) { |
336 |
if (thisray.ro == &Aftplane) { /* clipped */ |
337 |
thisray.ro = NULL; |
338 |
thisray.rot = FHUGE; |
339 |
} else |
340 |
sourcehit(&thisray); |
341 |
} |
342 |
} else |
343 |
rayvalue(&thisray); |
344 |
printvals(&thisray); |
345 |
} |
346 |
|
347 |
|
348 |
static void |
349 |
irrad( /* compute immediate irradiance value */ |
350 |
FVECT org, |
351 |
FVECT dir |
352 |
) |
353 |
{ |
354 |
register int i; |
355 |
|
356 |
for (i = 0; i < 3; i++) { |
357 |
thisray.rorg[i] = org[i] + dir[i]; |
358 |
thisray.rdir[i] = -dir[i]; |
359 |
} |
360 |
thisray.rmax = 0.0; |
361 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
362 |
/* pretend we hit surface */ |
363 |
thisray.rot = 1.0-1e-4; |
364 |
thisray.rod = 1.0; |
365 |
VCOPY(thisray.ron, dir); |
366 |
for (i = 0; i < 3; i++) /* fudge factor */ |
367 |
thisray.rop[i] = org[i] + 1e-4*dir[i]; |
368 |
/* compute and print */ |
369 |
(*ofun[Lamb.otype].funp)(&Lamb, &thisray); |
370 |
printvals(&thisray); |
371 |
} |
372 |
|
373 |
|
374 |
static void |
375 |
printvals( /* print requested ray values */ |
376 |
RAY *r |
377 |
) |
378 |
{ |
379 |
register oputf_t **tp; |
380 |
|
381 |
if (ray_out[0] == NULL) |
382 |
return; |
383 |
for (tp = ray_out; *tp != NULL; tp++) |
384 |
(**tp)(r); |
385 |
if (outform == 'a') |
386 |
putchar('\n'); |
387 |
} |
388 |
|
389 |
|
390 |
static int |
391 |
getvec( /* get a vector from fp */ |
392 |
register FVECT vec, |
393 |
int fmt, |
394 |
FILE *fp |
395 |
) |
396 |
{ |
397 |
static float vf[3]; |
398 |
static double vd[3]; |
399 |
char buf[32]; |
400 |
register int i; |
401 |
|
402 |
switch (fmt) { |
403 |
case 'a': /* ascii */ |
404 |
for (i = 0; i < 3; i++) { |
405 |
if (fgetword(buf, sizeof(buf), fp) == NULL || |
406 |
!isflt(buf)) |
407 |
return(-1); |
408 |
vec[i] = atof(buf); |
409 |
} |
410 |
break; |
411 |
case 'f': /* binary float */ |
412 |
if (fread((char *)vf, sizeof(float), 3, fp) != 3) |
413 |
return(-1); |
414 |
vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2]; |
415 |
break; |
416 |
case 'd': /* binary double */ |
417 |
if (fread((char *)vd, sizeof(double), 3, fp) != 3) |
418 |
return(-1); |
419 |
vec[0] = vd[0]; vec[1] = vd[1]; vec[2] = vd[2]; |
420 |
break; |
421 |
default: |
422 |
error(CONSISTENCY, "botched input format"); |
423 |
} |
424 |
return(0); |
425 |
} |
426 |
|
427 |
|
428 |
static void |
429 |
tranotify( /* record new modifier */ |
430 |
OBJECT obj |
431 |
) |
432 |
{ |
433 |
static int hitlimit = 0; |
434 |
register OBJREC *o = objptr(obj); |
435 |
register char **tralp; |
436 |
|
437 |
if (obj == OVOID) { /* starting over */ |
438 |
traset[0] = 0; |
439 |
hitlimit = 0; |
440 |
return; |
441 |
} |
442 |
if (hitlimit || !ismodifier(o->otype)) |
443 |
return; |
444 |
for (tralp = tralist; *tralp != NULL; tralp++) |
445 |
if (!strcmp(o->oname, *tralp)) { |
446 |
if (traset[0] >= MAXTSET) { |
447 |
error(WARNING, "too many modifiers in trace list"); |
448 |
hitlimit++; |
449 |
return; /* should this be fatal? */ |
450 |
} |
451 |
insertelem(traset, obj); |
452 |
return; |
453 |
} |
454 |
} |
455 |
|
456 |
|
457 |
static void |
458 |
ourtrace( /* print ray values */ |
459 |
RAY *r |
460 |
) |
461 |
{ |
462 |
register oputf_t **tp; |
463 |
|
464 |
if (every_out[0] == NULL) |
465 |
return; |
466 |
if (r->ro == NULL) { |
467 |
if (traincl == 1) |
468 |
return; |
469 |
} else if (traincl != -1 && traincl != inset(traset, r->ro->omod)) |
470 |
return; |
471 |
tabin(r); |
472 |
for (tp = every_out; *tp != NULL; tp++) |
473 |
(**tp)(r); |
474 |
if (outform == 'a') |
475 |
putchar('\n'); |
476 |
} |
477 |
|
478 |
|
479 |
static void |
480 |
tabin( /* tab in appropriate amount */ |
481 |
RAY *r |
482 |
) |
483 |
{ |
484 |
const RAY *rp; |
485 |
|
486 |
for (rp = r->parent; rp != NULL; rp = rp->parent) |
487 |
putchar('\t'); |
488 |
} |
489 |
|
490 |
|
491 |
static void |
492 |
oputo( /* print origin */ |
493 |
RAY *r |
494 |
) |
495 |
{ |
496 |
(*putreal)(r->rorg[0]); |
497 |
(*putreal)(r->rorg[1]); |
498 |
(*putreal)(r->rorg[2]); |
499 |
} |
500 |
|
501 |
|
502 |
static void |
503 |
oputd( /* print direction */ |
504 |
RAY *r |
505 |
) |
506 |
{ |
507 |
(*putreal)(r->rdir[0]); |
508 |
(*putreal)(r->rdir[1]); |
509 |
(*putreal)(r->rdir[2]); |
510 |
} |
511 |
|
512 |
|
513 |
static void |
514 |
oputv( /* print value */ |
515 |
RAY *r |
516 |
) |
517 |
{ |
518 |
if (outform == 'c') { |
519 |
COLR cout; |
520 |
setcolr(cout, colval(r->rcol,RED), |
521 |
colval(r->rcol,GRN), |
522 |
colval(r->rcol,BLU)); |
523 |
fwrite((char *)cout, sizeof(cout), 1, stdout); |
524 |
return; |
525 |
} |
526 |
(*putreal)(colval(r->rcol,RED)); |
527 |
(*putreal)(colval(r->rcol,GRN)); |
528 |
(*putreal)(colval(r->rcol,BLU)); |
529 |
} |
530 |
|
531 |
|
532 |
static void |
533 |
oputl( /* print effective distance */ |
534 |
RAY *r |
535 |
) |
536 |
{ |
537 |
(*putreal)(r->rt); |
538 |
} |
539 |
|
540 |
|
541 |
static void |
542 |
oputL( /* print single ray length */ |
543 |
RAY *r |
544 |
) |
545 |
{ |
546 |
(*putreal)(r->rot); |
547 |
} |
548 |
|
549 |
|
550 |
static void |
551 |
oputc( /* print local coordinates */ |
552 |
RAY *r |
553 |
) |
554 |
{ |
555 |
(*putreal)(r->uv[0]); |
556 |
(*putreal)(r->uv[1]); |
557 |
} |
558 |
|
559 |
|
560 |
static void |
561 |
oputp( /* print point */ |
562 |
RAY *r |
563 |
) |
564 |
{ |
565 |
if (r->rot < FHUGE) { |
566 |
(*putreal)(r->rop[0]); |
567 |
(*putreal)(r->rop[1]); |
568 |
(*putreal)(r->rop[2]); |
569 |
} else { |
570 |
(*putreal)(0.0); |
571 |
(*putreal)(0.0); |
572 |
(*putreal)(0.0); |
573 |
} |
574 |
} |
575 |
|
576 |
|
577 |
static void |
578 |
oputN( /* print unperturbed normal */ |
579 |
RAY *r |
580 |
) |
581 |
{ |
582 |
if (r->rot < FHUGE) { |
583 |
(*putreal)(r->ron[0]); |
584 |
(*putreal)(r->ron[1]); |
585 |
(*putreal)(r->ron[2]); |
586 |
} else { |
587 |
(*putreal)(0.0); |
588 |
(*putreal)(0.0); |
589 |
(*putreal)(0.0); |
590 |
} |
591 |
} |
592 |
|
593 |
|
594 |
static void |
595 |
oputn( /* print perturbed normal */ |
596 |
RAY *r |
597 |
) |
598 |
{ |
599 |
FVECT pnorm; |
600 |
|
601 |
if (r->rot >= FHUGE) { |
602 |
(*putreal)(0.0); |
603 |
(*putreal)(0.0); |
604 |
(*putreal)(0.0); |
605 |
return; |
606 |
} |
607 |
raynormal(pnorm, r); |
608 |
(*putreal)(pnorm[0]); |
609 |
(*putreal)(pnorm[1]); |
610 |
(*putreal)(pnorm[2]); |
611 |
} |
612 |
|
613 |
|
614 |
static void |
615 |
oputs( /* print name */ |
616 |
RAY *r |
617 |
) |
618 |
{ |
619 |
if (r->ro != NULL) |
620 |
fputs(r->ro->oname, stdout); |
621 |
else |
622 |
putchar('*'); |
623 |
putchar('\t'); |
624 |
} |
625 |
|
626 |
|
627 |
static void |
628 |
oputw( /* print weight */ |
629 |
RAY *r |
630 |
) |
631 |
{ |
632 |
(*putreal)(r->rweight); |
633 |
} |
634 |
|
635 |
|
636 |
static void |
637 |
oputW( /* print contribution */ |
638 |
RAY *r |
639 |
) |
640 |
{ |
641 |
double contr[3]; |
642 |
|
643 |
raycontrib(contr, r, PRIMARY); |
644 |
(*putreal)(contr[RED]); |
645 |
(*putreal)(contr[GRN]); |
646 |
(*putreal)(contr[BLU]); |
647 |
} |
648 |
|
649 |
|
650 |
static void |
651 |
oputm( /* print modifier */ |
652 |
RAY *r |
653 |
) |
654 |
{ |
655 |
if (r->ro != NULL) |
656 |
if (r->ro->omod != OVOID) |
657 |
fputs(objptr(r->ro->omod)->oname, stdout); |
658 |
else |
659 |
fputs(VOIDID, stdout); |
660 |
else |
661 |
putchar('*'); |
662 |
putchar('\t'); |
663 |
} |
664 |
|
665 |
|
666 |
static void |
667 |
oputM( /* print material */ |
668 |
RAY *r |
669 |
) |
670 |
{ |
671 |
OBJREC *mat; |
672 |
|
673 |
if (r->ro != NULL) { |
674 |
if ((mat = findmaterial(r->ro)) != NULL) |
675 |
fputs(mat->oname, stdout); |
676 |
else |
677 |
fputs(VOIDID, stdout); |
678 |
} else |
679 |
putchar('*'); |
680 |
putchar('\t'); |
681 |
} |
682 |
|
683 |
|
684 |
static void |
685 |
oputtilde( /* output tilde (spacer) */ |
686 |
RAY *r |
687 |
) |
688 |
{ |
689 |
fputs("~\t", stdout); |
690 |
} |
691 |
|
692 |
|
693 |
static void |
694 |
puta( /* print ascii value */ |
695 |
double v |
696 |
) |
697 |
{ |
698 |
printf("%e\t", v); |
699 |
} |
700 |
|
701 |
|
702 |
static void |
703 |
putd(v) /* print binary double */ |
704 |
double v; |
705 |
{ |
706 |
fwrite((char *)&v, sizeof(v), 1, stdout); |
707 |
} |
708 |
|
709 |
|
710 |
static void |
711 |
putf(v) /* print binary float */ |
712 |
double v; |
713 |
{ |
714 |
float f = v; |
715 |
|
716 |
fwrite((char *)&f, sizeof(f), 1, stdout); |
717 |
} |