1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: rtrace.c,v 2.52 2006/02/22 17:05:36 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 |
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* 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 |
|
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#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" |
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#include "random.h" |
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|
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CUBE thescene; /* our scene */ |
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OBJECT nsceneobjs; /* number of objects in our scene */ |
36 |
|
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int dimlist[MAXDIM]; /* sampling dimensions */ |
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int ndims = 0; /* number of sampling dimensions */ |
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int samplendx = 0; /* index for this sample */ |
40 |
|
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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? */ |
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|
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void (*trace)() = NULL; /* trace call */ |
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|
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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 |
57 |
#define MAXTSET 8192 /* maximum number in trace set */ |
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#endif |
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OBJECT traset[MAXTSET+1]={0}; /* trace include/exclude set */ |
60 |
|
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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 */ |
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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 */ |
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int ambincl = -1; /* include == 1, exclude == 0 */ |
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|
96 |
static int castonly = 0; |
97 |
|
98 |
static RAY thisray; /* for our convenience */ |
99 |
|
100 |
typedef void putf_t(double v); |
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static putf_t puta, putd, putf; |
102 |
|
103 |
typedef void oputf_t(RAY *r); |
104 |
static oputf_t oputo, oputd, oputv, oputV, oputl, oputL, oputc, oputp, |
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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); |
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static void printvals(RAY *r); |
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static int getvec(FVECT vec, int fmt, FILE *fp); |
114 |
static void tabin(RAY *r); |
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static void ourtrace(RAY *r); |
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|
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}; |
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|
122 |
|
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void |
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quit( /* quit program */ |
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int code |
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) |
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 * |
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formstr( /* return format identifier */ |
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int f |
139 |
) |
140 |
{ |
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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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} |
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return("unknown"); |
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} |
149 |
|
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|
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extern void |
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rtrace( /* trace rays from file */ |
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char *fname |
154 |
) |
155 |
{ |
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unsigned long vcount = (hresolu > 1) ? (unsigned long)hresolu*vresolu |
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: vresolu; |
158 |
long nextflush = hresolu; |
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FILE *fp; |
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double d; |
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FVECT orig, direc; |
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/* set up input */ |
163 |
if (fname == NULL) |
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fp = stdin; |
165 |
else if ((fp = fopen(fname, "r")) == NULL) { |
166 |
sprintf(errmsg, "cannot open input file \"%s\"", fname); |
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error(SYSTEM, errmsg); |
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} |
169 |
if (inform != 'a') |
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SET_FILE_BINARY(fp); |
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/* set up output */ |
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setoutput(outvals); |
173 |
switch (outform) { |
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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"); |
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break; |
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default: |
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error(CONSISTENCY, "botched output format"); |
183 |
} |
184 |
if (hresolu > 0) { |
185 |
if (vresolu > 0) |
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fprtresolu(hresolu, vresolu, stdout); |
187 |
fflush(stdout); |
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} |
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/* process file */ |
190 |
while (getvec(orig, inform, fp) == 0 && |
191 |
getvec(direc, inform, fp) == 0) { |
192 |
|
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d = normalize(direc); |
194 |
if (d == 0.0) { /* zero ==> flush */ |
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bogusray(); |
196 |
if (--nextflush <= 0 || !vcount) { |
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fflush(stdout); |
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nextflush = hresolu; |
199 |
} |
200 |
} else { |
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samplendx++; |
202 |
/* compute and print */ |
203 |
if (imm_irrad) |
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irrad(orig, direc); |
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else |
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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 'V': /* contribution */ |
269 |
*table++ = oputV; |
270 |
if (ambounce > 0 && (ambacc > FTINY || ambssamp > 0)) |
271 |
error(WARNING, |
272 |
"-otV accuracy depends on -aa 0 -as 0"); |
273 |
break; |
274 |
case 'l': /* effective distance */ |
275 |
*table++ = oputl; |
276 |
castonly = 0; |
277 |
break; |
278 |
case 'c': /* local coordinates */ |
279 |
*table++ = oputc; |
280 |
break; |
281 |
case 'L': /* single ray length */ |
282 |
*table++ = oputL; |
283 |
break; |
284 |
case 'p': /* point */ |
285 |
*table++ = oputp; |
286 |
break; |
287 |
case 'n': /* perturbed normal */ |
288 |
*table++ = oputn; |
289 |
castonly = 0; |
290 |
break; |
291 |
case 'N': /* unperturbed normal */ |
292 |
*table++ = oputN; |
293 |
break; |
294 |
case 's': /* surface */ |
295 |
*table++ = oputs; |
296 |
break; |
297 |
case 'w': /* weight */ |
298 |
*table++ = oputw; |
299 |
break; |
300 |
case 'W': /* coefficient */ |
301 |
*table++ = oputW; |
302 |
if (ambounce > 0 && (ambacc > FTINY || ambssamp > 0)) |
303 |
error(WARNING, |
304 |
"-otW accuracy depends on -aa 0 -as 0"); |
305 |
break; |
306 |
case 'm': /* modifier */ |
307 |
*table++ = oputm; |
308 |
break; |
309 |
case 'M': /* material */ |
310 |
*table++ = oputM; |
311 |
break; |
312 |
case '~': /* tilde */ |
313 |
*table++ = oputtilde; |
314 |
break; |
315 |
} |
316 |
*table = NULL; |
317 |
} |
318 |
|
319 |
|
320 |
static void |
321 |
bogusray(void) /* print out empty record */ |
322 |
{ |
323 |
thisray.rorg[0] = thisray.rorg[1] = thisray.rorg[2] = |
324 |
thisray.rdir[0] = thisray.rdir[1] = thisray.rdir[2] = 0.0; |
325 |
thisray.rmax = 0.0; |
326 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
327 |
printvals(&thisray); |
328 |
} |
329 |
|
330 |
|
331 |
static void |
332 |
rad( /* compute and print ray value(s) */ |
333 |
FVECT org, |
334 |
FVECT dir, |
335 |
double dmax |
336 |
) |
337 |
{ |
338 |
VCOPY(thisray.rorg, org); |
339 |
VCOPY(thisray.rdir, dir); |
340 |
thisray.rmax = dmax; |
341 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
342 |
if (castonly) { |
343 |
if (!localhit(&thisray, &thescene)) { |
344 |
if (thisray.ro == &Aftplane) { /* clipped */ |
345 |
thisray.ro = NULL; |
346 |
thisray.rot = FHUGE; |
347 |
} else |
348 |
sourcehit(&thisray); |
349 |
} |
350 |
} else |
351 |
rayvalue(&thisray); |
352 |
printvals(&thisray); |
353 |
} |
354 |
|
355 |
|
356 |
static void |
357 |
irrad( /* compute immediate irradiance value */ |
358 |
FVECT org, |
359 |
FVECT dir |
360 |
) |
361 |
{ |
362 |
register int i; |
363 |
|
364 |
for (i = 0; i < 3; i++) { |
365 |
thisray.rorg[i] = org[i] + dir[i]; |
366 |
thisray.rdir[i] = -dir[i]; |
367 |
} |
368 |
thisray.rmax = 0.0; |
369 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
370 |
/* pretend we hit surface */ |
371 |
thisray.rot = 1.0-1e-4; |
372 |
thisray.rod = 1.0; |
373 |
VCOPY(thisray.ron, dir); |
374 |
for (i = 0; i < 3; i++) /* fudge factor */ |
375 |
thisray.rop[i] = org[i] + 1e-4*dir[i]; |
376 |
/* compute and print */ |
377 |
(*ofun[Lamb.otype].funp)(&Lamb, &thisray); |
378 |
printvals(&thisray); |
379 |
} |
380 |
|
381 |
|
382 |
static void |
383 |
printvals( /* print requested ray values */ |
384 |
RAY *r |
385 |
) |
386 |
{ |
387 |
register oputf_t **tp; |
388 |
|
389 |
if (ray_out[0] == NULL) |
390 |
return; |
391 |
for (tp = ray_out; *tp != NULL; tp++) |
392 |
(**tp)(r); |
393 |
if (outform == 'a') |
394 |
putchar('\n'); |
395 |
} |
396 |
|
397 |
|
398 |
static int |
399 |
getvec( /* get a vector from fp */ |
400 |
register FVECT vec, |
401 |
int fmt, |
402 |
FILE *fp |
403 |
) |
404 |
{ |
405 |
static float vf[3]; |
406 |
static double vd[3]; |
407 |
char buf[32]; |
408 |
register int i; |
409 |
|
410 |
switch (fmt) { |
411 |
case 'a': /* ascii */ |
412 |
for (i = 0; i < 3; i++) { |
413 |
if (fgetword(buf, sizeof(buf), fp) == NULL || |
414 |
!isflt(buf)) |
415 |
return(-1); |
416 |
vec[i] = atof(buf); |
417 |
} |
418 |
break; |
419 |
case 'f': /* binary float */ |
420 |
if (fread((char *)vf, sizeof(float), 3, fp) != 3) |
421 |
return(-1); |
422 |
vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2]; |
423 |
break; |
424 |
case 'd': /* binary double */ |
425 |
if (fread((char *)vd, sizeof(double), 3, fp) != 3) |
426 |
return(-1); |
427 |
vec[0] = vd[0]; vec[1] = vd[1]; vec[2] = vd[2]; |
428 |
break; |
429 |
default: |
430 |
error(CONSISTENCY, "botched input format"); |
431 |
} |
432 |
return(0); |
433 |
} |
434 |
|
435 |
|
436 |
static void |
437 |
tranotify( /* record new modifier */ |
438 |
OBJECT obj |
439 |
) |
440 |
{ |
441 |
static int hitlimit = 0; |
442 |
register OBJREC *o = objptr(obj); |
443 |
register char **tralp; |
444 |
|
445 |
if (obj == OVOID) { /* starting over */ |
446 |
traset[0] = 0; |
447 |
hitlimit = 0; |
448 |
return; |
449 |
} |
450 |
if (hitlimit || !ismodifier(o->otype)) |
451 |
return; |
452 |
for (tralp = tralist; *tralp != NULL; tralp++) |
453 |
if (!strcmp(o->oname, *tralp)) { |
454 |
if (traset[0] >= MAXTSET) { |
455 |
error(WARNING, "too many modifiers in trace list"); |
456 |
hitlimit++; |
457 |
return; /* should this be fatal? */ |
458 |
} |
459 |
insertelem(traset, obj); |
460 |
return; |
461 |
} |
462 |
} |
463 |
|
464 |
|
465 |
static void |
466 |
ourtrace( /* print ray values */ |
467 |
RAY *r |
468 |
) |
469 |
{ |
470 |
register oputf_t **tp; |
471 |
|
472 |
if (every_out[0] == NULL) |
473 |
return; |
474 |
if (r->ro == NULL) { |
475 |
if (traincl == 1) |
476 |
return; |
477 |
} else if (traincl != -1 && traincl != inset(traset, r->ro->omod)) |
478 |
return; |
479 |
tabin(r); |
480 |
for (tp = every_out; *tp != NULL; tp++) |
481 |
(**tp)(r); |
482 |
if (outform == 'a') |
483 |
putchar('\n'); |
484 |
} |
485 |
|
486 |
|
487 |
static void |
488 |
tabin( /* tab in appropriate amount */ |
489 |
RAY *r |
490 |
) |
491 |
{ |
492 |
const RAY *rp; |
493 |
|
494 |
for (rp = r->parent; rp != NULL; rp = rp->parent) |
495 |
putchar('\t'); |
496 |
} |
497 |
|
498 |
|
499 |
static void |
500 |
oputo( /* print origin */ |
501 |
RAY *r |
502 |
) |
503 |
{ |
504 |
(*putreal)(r->rorg[0]); |
505 |
(*putreal)(r->rorg[1]); |
506 |
(*putreal)(r->rorg[2]); |
507 |
} |
508 |
|
509 |
|
510 |
static void |
511 |
oputd( /* print direction */ |
512 |
RAY *r |
513 |
) |
514 |
{ |
515 |
(*putreal)(r->rdir[0]); |
516 |
(*putreal)(r->rdir[1]); |
517 |
(*putreal)(r->rdir[2]); |
518 |
} |
519 |
|
520 |
|
521 |
static void |
522 |
oputv( /* print value */ |
523 |
RAY *r |
524 |
) |
525 |
{ |
526 |
if (outform == 'c') { |
527 |
COLR cout; |
528 |
setcolr(cout, colval(r->rcol,RED), |
529 |
colval(r->rcol,GRN), |
530 |
colval(r->rcol,BLU)); |
531 |
fwrite((char *)cout, sizeof(cout), 1, stdout); |
532 |
return; |
533 |
} |
534 |
(*putreal)(colval(r->rcol,RED)); |
535 |
(*putreal)(colval(r->rcol,GRN)); |
536 |
(*putreal)(colval(r->rcol,BLU)); |
537 |
} |
538 |
|
539 |
|
540 |
static void |
541 |
oputV( /* print value contribution */ |
542 |
RAY *r |
543 |
) |
544 |
{ |
545 |
double contr[3]; |
546 |
|
547 |
raycontrib(contr, r, PRIMARY); |
548 |
multcolor(contr, r->rcol); |
549 |
(*putreal)(contr[RED]); |
550 |
(*putreal)(contr[GRN]); |
551 |
(*putreal)(contr[BLU]); |
552 |
} |
553 |
|
554 |
|
555 |
static void |
556 |
oputl( /* print effective distance */ |
557 |
RAY *r |
558 |
) |
559 |
{ |
560 |
(*putreal)(r->rt); |
561 |
} |
562 |
|
563 |
|
564 |
static void |
565 |
oputL( /* print single ray length */ |
566 |
RAY *r |
567 |
) |
568 |
{ |
569 |
(*putreal)(r->rot); |
570 |
} |
571 |
|
572 |
|
573 |
static void |
574 |
oputc( /* print local coordinates */ |
575 |
RAY *r |
576 |
) |
577 |
{ |
578 |
(*putreal)(r->uv[0]); |
579 |
(*putreal)(r->uv[1]); |
580 |
} |
581 |
|
582 |
|
583 |
static void |
584 |
oputp( /* print point */ |
585 |
RAY *r |
586 |
) |
587 |
{ |
588 |
if (r->rot < FHUGE) { |
589 |
(*putreal)(r->rop[0]); |
590 |
(*putreal)(r->rop[1]); |
591 |
(*putreal)(r->rop[2]); |
592 |
} else { |
593 |
(*putreal)(0.0); |
594 |
(*putreal)(0.0); |
595 |
(*putreal)(0.0); |
596 |
} |
597 |
} |
598 |
|
599 |
|
600 |
static void |
601 |
oputN( /* print unperturbed normal */ |
602 |
RAY *r |
603 |
) |
604 |
{ |
605 |
if (r->rot < FHUGE) { |
606 |
(*putreal)(r->ron[0]); |
607 |
(*putreal)(r->ron[1]); |
608 |
(*putreal)(r->ron[2]); |
609 |
} else { |
610 |
(*putreal)(0.0); |
611 |
(*putreal)(0.0); |
612 |
(*putreal)(0.0); |
613 |
} |
614 |
} |
615 |
|
616 |
|
617 |
static void |
618 |
oputn( /* print perturbed normal */ |
619 |
RAY *r |
620 |
) |
621 |
{ |
622 |
FVECT pnorm; |
623 |
|
624 |
if (r->rot >= FHUGE) { |
625 |
(*putreal)(0.0); |
626 |
(*putreal)(0.0); |
627 |
(*putreal)(0.0); |
628 |
return; |
629 |
} |
630 |
raynormal(pnorm, r); |
631 |
(*putreal)(pnorm[0]); |
632 |
(*putreal)(pnorm[1]); |
633 |
(*putreal)(pnorm[2]); |
634 |
} |
635 |
|
636 |
|
637 |
static void |
638 |
oputs( /* print name */ |
639 |
RAY *r |
640 |
) |
641 |
{ |
642 |
if (r->ro != NULL) |
643 |
fputs(r->ro->oname, stdout); |
644 |
else |
645 |
putchar('*'); |
646 |
putchar('\t'); |
647 |
} |
648 |
|
649 |
|
650 |
static void |
651 |
oputw( /* print weight */ |
652 |
RAY *r |
653 |
) |
654 |
{ |
655 |
(*putreal)(r->rweight); |
656 |
} |
657 |
|
658 |
|
659 |
static void |
660 |
oputW( /* print coefficient */ |
661 |
RAY *r |
662 |
) |
663 |
{ |
664 |
double contr[3]; |
665 |
|
666 |
raycontrib(contr, r, PRIMARY); |
667 |
(*putreal)(contr[RED]); |
668 |
(*putreal)(contr[GRN]); |
669 |
(*putreal)(contr[BLU]); |
670 |
} |
671 |
|
672 |
|
673 |
static void |
674 |
oputm( /* print modifier */ |
675 |
RAY *r |
676 |
) |
677 |
{ |
678 |
if (r->ro != NULL) |
679 |
if (r->ro->omod != OVOID) |
680 |
fputs(objptr(r->ro->omod)->oname, stdout); |
681 |
else |
682 |
fputs(VOIDID, stdout); |
683 |
else |
684 |
putchar('*'); |
685 |
putchar('\t'); |
686 |
} |
687 |
|
688 |
|
689 |
static void |
690 |
oputM( /* print material */ |
691 |
RAY *r |
692 |
) |
693 |
{ |
694 |
OBJREC *mat; |
695 |
|
696 |
if (r->ro != NULL) { |
697 |
if ((mat = findmaterial(r->ro)) != NULL) |
698 |
fputs(mat->oname, stdout); |
699 |
else |
700 |
fputs(VOIDID, stdout); |
701 |
} else |
702 |
putchar('*'); |
703 |
putchar('\t'); |
704 |
} |
705 |
|
706 |
|
707 |
static void |
708 |
oputtilde( /* output tilde (spacer) */ |
709 |
RAY *r |
710 |
) |
711 |
{ |
712 |
fputs("~\t", stdout); |
713 |
} |
714 |
|
715 |
|
716 |
static void |
717 |
puta( /* print ascii value */ |
718 |
double v |
719 |
) |
720 |
{ |
721 |
printf("%e\t", v); |
722 |
} |
723 |
|
724 |
|
725 |
static void |
726 |
putd(v) /* print binary double */ |
727 |
double v; |
728 |
{ |
729 |
fwrite((char *)&v, sizeof(v), 1, stdout); |
730 |
} |
731 |
|
732 |
|
733 |
static void |
734 |
putf(v) /* print binary float */ |
735 |
double v; |
736 |
{ |
737 |
float f = v; |
738 |
|
739 |
fwrite((char *)&f, sizeof(f), 1, stdout); |
740 |
} |