| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: raycalls.c,v 2.19 2011/02/18 00:40:25 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* raycalls.c - interface for running Radiance rendering as a library |
| 6 |
* |
| 7 |
* External symbols declared in ray.h |
| 8 |
*/ |
| 9 |
|
| 10 |
#include "copyright.h" |
| 11 |
|
| 12 |
/* |
| 13 |
* These routines are designed to aid the programmer who wishes |
| 14 |
* to call Radiance as a library. Unfortunately, the system was |
| 15 |
* not originally intended to be run this way, and there are some |
| 16 |
* awkward limitations to contend with. The most irritating |
| 17 |
* perhaps is that the global variables and functions do not have |
| 18 |
* a prefix, and the symbols are a bit generic. This results in a |
| 19 |
* serious invasion of the calling application's name-space, and |
| 20 |
* you may need to rename either some Radiance routines or some |
| 21 |
* of your routines to avoid conflicts. Another limitation is |
| 22 |
* that the global variables are not gathered together into any |
| 23 |
* sort of context, so it is impossible to simultaneously run |
| 24 |
* this library on multiple scenes or in multiple threads. |
| 25 |
* You get one scene and one thread, and if you want more, you |
| 26 |
* will have to go with the process model defined in raypcalls.c. |
| 27 |
* Finally, unrecoverable errors result in a call to the application- |
| 28 |
* defined function quit(). The usual thing to do is to call exit(). |
| 29 |
* You might want to do something else instead, like |
| 30 |
* call setjmp()/longjmp() to bring you back to the calling |
| 31 |
* function for recovery. You may also wish to define your own |
| 32 |
* wputs(s) and eputs(s) functions to output warning and error |
| 33 |
* messages, respectively. |
| 34 |
* |
| 35 |
* With those caveats, we have attempted to make the interface |
| 36 |
* as simple as we can. Global variables and their defaults |
| 37 |
* are defined below, and including "ray.h" declares these |
| 38 |
* along with all the routines you are likely to need. First, |
| 39 |
* assign the global variable progname to your argv[0], then |
| 40 |
* change the rendering parameters as you like. If you have a set |
| 41 |
* of option arguments you are working from, the getrenderopt(ac,av) |
| 42 |
* call should be very useful. Before tracing any rays, you |
| 43 |
* must read in the octree with a call to ray_init(oct). |
| 44 |
* Passing NULL for the file name causes ray_init() to read |
| 45 |
* the octree from the standard input -- rarely a good idea. |
| 46 |
* However, one may read an octree from a program (such as |
| 47 |
* oconv) by preceding a shell command by a '!' character. |
| 48 |
* |
| 49 |
* To trace a ray, define a RAY object myRay and assign: |
| 50 |
* |
| 51 |
* myRay.rorg = ( ray origin point ) |
| 52 |
* myRay.rdir = ( normalized ray direction ) |
| 53 |
* myRay.rmax = ( maximum length, or zero for no limit ) |
| 54 |
* |
| 55 |
* If you are rendering from a VIEW structure, this can be |
| 56 |
* accomplished with a single call for the ray at (x,y): |
| 57 |
* |
| 58 |
* myRay.rmax = viewray(myRay.rorg, myRay.rdir, &myView, x, y); |
| 59 |
* |
| 60 |
* Then, trace the primary ray with: |
| 61 |
* |
| 62 |
* ray_trace(&myRay); |
| 63 |
* |
| 64 |
* The resulting contents of myRay should provide you with |
| 65 |
* more than enough information about what the ray hit, |
| 66 |
* the computed value, etc. For further clues of how to |
| 67 |
* compute irradiance, how to get callbacks on the evaluated |
| 68 |
* ray tree, etc., see the contents of rtrace.c. See |
| 69 |
* also the rpmain.c, rtmain.c, and rvmain.c modules |
| 70 |
* to learn more how rendering options are processed. |
| 71 |
* |
| 72 |
* When you are done, you may call ray_done(1) to clean |
| 73 |
* up memory used by Radiance. It doesn't free everything, |
| 74 |
* but it makes a valiant effort. If you call ray_done(0), |
| 75 |
* it leaves data that is likely to be reused, including |
| 76 |
* loaded data files and fonts. The library may be |
| 77 |
* restarted at any point by calling ray_init() on a new |
| 78 |
* octree. |
| 79 |
* |
| 80 |
* The call ray_save(rp) fills a parameter structure |
| 81 |
* with the current global parameter settings, which may be |
| 82 |
* restored at any time with a call to ray_restore(rp). |
| 83 |
* This buffer contains no linked information, and thus |
| 84 |
* may be passed between processes using write() and |
| 85 |
* read() calls, so long as byte order is maintained. |
| 86 |
* Calling ray_restore(NULL) restores the original |
| 87 |
* default parameters, which is also retrievable with |
| 88 |
* the call ray_defaults(rp). (These should be the |
| 89 |
* same as the defaults for rtrace.) |
| 90 |
*/ |
| 91 |
|
| 92 |
#include <string.h> |
| 93 |
#include <time.h> |
| 94 |
|
| 95 |
#include "ray.h" |
| 96 |
#include "source.h" |
| 97 |
#include "bsdf.h" |
| 98 |
#include "ambient.h" |
| 99 |
#include "otypes.h" |
| 100 |
#include "random.h" |
| 101 |
#include "data.h" |
| 102 |
#include "font.h" |
| 103 |
|
| 104 |
char *progname = "unknown_app"; /* caller sets to argv[0] */ |
| 105 |
|
| 106 |
char *octname; /* octree name we are given */ |
| 107 |
|
| 108 |
char *shm_boundary = NULL; /* boundary of shared memory */ |
| 109 |
|
| 110 |
CUBE thescene; /* our scene */ |
| 111 |
OBJECT nsceneobjs; /* number of objects in our scene */ |
| 112 |
|
| 113 |
int dimlist[MAXDIM]; /* sampling dimensions */ |
| 114 |
int ndims = 0; /* number of sampling dimensions */ |
| 115 |
int samplendx = 0; /* index for this sample */ |
| 116 |
|
| 117 |
void (*trace)() = NULL; /* trace call */ |
| 118 |
|
| 119 |
void (*addobjnotify[8])() = {ambnotify, NULL}; |
| 120 |
|
| 121 |
int do_irrad = 0; /* compute irradiance? */ |
| 122 |
|
| 123 |
int rand_samp = 0; /* pure Monte Carlo sampling? */ |
| 124 |
|
| 125 |
double dstrsrc = 0.0; /* square source distribution */ |
| 126 |
double shadthresh = .03; /* shadow threshold */ |
| 127 |
double shadcert = .75; /* shadow certainty */ |
| 128 |
int directrelay = 2; /* number of source relays */ |
| 129 |
int vspretest = 512; /* virtual source pretest density */ |
| 130 |
int directvis = 1; /* sources visible? */ |
| 131 |
double srcsizerat = .2; /* maximum ratio source size/dist. */ |
| 132 |
|
| 133 |
COLOR cextinction = BLKCOLOR; /* global extinction coefficient */ |
| 134 |
COLOR salbedo = BLKCOLOR; /* global scattering albedo */ |
| 135 |
double seccg = 0.; /* global scattering eccentricity */ |
| 136 |
double ssampdist = 0.; /* scatter sampling distance */ |
| 137 |
|
| 138 |
double specthresh = .15; /* specular sampling threshold */ |
| 139 |
double specjitter = 1.; /* specular sampling jitter */ |
| 140 |
|
| 141 |
int backvis = 1; /* back face visibility */ |
| 142 |
|
| 143 |
int maxdepth = 8; /* maximum recursion depth */ |
| 144 |
double minweight = 5e-4; /* minimum ray weight */ |
| 145 |
|
| 146 |
char *ambfile = NULL; /* ambient file name */ |
| 147 |
COLOR ambval = BLKCOLOR; /* ambient value */ |
| 148 |
int ambvwt = 0; /* initial weight for ambient value */ |
| 149 |
double ambacc = 0.1; /* ambient accuracy */ |
| 150 |
int ambres = 256; /* ambient resolution */ |
| 151 |
int ambdiv = 1024; /* ambient divisions */ |
| 152 |
int ambssamp = 512; /* ambient super-samples */ |
| 153 |
int ambounce = 0; /* ambient bounces */ |
| 154 |
char *amblist[AMBLLEN+1]; /* ambient include/exclude list */ |
| 155 |
int ambincl = -1; /* include == 1, exclude == 0 */ |
| 156 |
|
| 157 |
|
| 158 |
void |
| 159 |
ray_init( /* initialize ray-tracing calculation */ |
| 160 |
char *otnm |
| 161 |
) |
| 162 |
{ |
| 163 |
if (nobjects > 0) /* free old scene data */ |
| 164 |
ray_done(0); |
| 165 |
/* initialize object types */ |
| 166 |
if (ofun[OBJ_SPHERE].funp == o_default) |
| 167 |
initotypes(); |
| 168 |
/* initialize urand */ |
| 169 |
if (rand_samp) { |
| 170 |
srandom((long)time(0)); |
| 171 |
initurand(0); |
| 172 |
} else { |
| 173 |
srandom(0L); |
| 174 |
initurand(2048); |
| 175 |
} |
| 176 |
/* read scene octree */ |
| 177 |
readoct(octname = otnm, ~(IO_FILES|IO_INFO), &thescene, NULL); |
| 178 |
nsceneobjs = nobjects; |
| 179 |
/* find and mark sources */ |
| 180 |
marksources(); |
| 181 |
/* initialize ambient calculation */ |
| 182 |
setambient(); |
| 183 |
/* ready to go... */ |
| 184 |
} |
| 185 |
|
| 186 |
void |
| 187 |
ray_trace( /* trace a primary ray */ |
| 188 |
RAY *r |
| 189 |
) |
| 190 |
{ |
| 191 |
rayorigin(r, PRIMARY, NULL, NULL); |
| 192 |
samplendx++; |
| 193 |
rayvalue(r); /* assumes origin and direction are set */ |
| 194 |
} |
| 195 |
|
| 196 |
|
| 197 |
void |
| 198 |
ray_done( /* free ray-tracing data */ |
| 199 |
int freall |
| 200 |
) |
| 201 |
{ |
| 202 |
retainfonts = 1; |
| 203 |
ambdone(); |
| 204 |
ambnotify(OVOID); |
| 205 |
freesources(); |
| 206 |
freeobjects(0, nobjects); |
| 207 |
donesets(); |
| 208 |
octdone(); |
| 209 |
thescene.cutree = EMPTY; |
| 210 |
octname = NULL; |
| 211 |
retainfonts = 0; |
| 212 |
if (freall) { |
| 213 |
freefont(NULL); |
| 214 |
freedata(NULL); |
| 215 |
SDfreeCache(NULL); |
| 216 |
initurand(0); |
| 217 |
} |
| 218 |
if (nobjects > 0) { |
| 219 |
sprintf(errmsg, "%ld objects left after call to ray_done()", |
| 220 |
(long)nobjects); |
| 221 |
error(WARNING, errmsg); |
| 222 |
} |
| 223 |
} |
| 224 |
|
| 225 |
|
| 226 |
void |
| 227 |
ray_save( /* save current parameter settings */ |
| 228 |
RAYPARAMS *rp |
| 229 |
) |
| 230 |
{ |
| 231 |
int i, ndx; |
| 232 |
|
| 233 |
if (rp == NULL) |
| 234 |
return; |
| 235 |
rp->do_irrad = do_irrad; |
| 236 |
rp->dstrsrc = dstrsrc; |
| 237 |
rp->shadthresh = shadthresh; |
| 238 |
rp->shadcert = shadcert; |
| 239 |
rp->directrelay = directrelay; |
| 240 |
rp->vspretest = vspretest; |
| 241 |
rp->directvis = directvis; |
| 242 |
rp->srcsizerat = srcsizerat; |
| 243 |
copycolor(rp->cextinction, cextinction); |
| 244 |
copycolor(rp->salbedo, salbedo); |
| 245 |
rp->seccg = seccg; |
| 246 |
rp->ssampdist = ssampdist; |
| 247 |
rp->specthresh = specthresh; |
| 248 |
rp->specjitter = specjitter; |
| 249 |
rp->backvis = backvis; |
| 250 |
rp->maxdepth = maxdepth; |
| 251 |
rp->minweight = minweight; |
| 252 |
copycolor(rp->ambval, ambval); |
| 253 |
memset(rp->ambfile, '\0', sizeof(rp->ambfile)); |
| 254 |
if (ambfile != NULL) |
| 255 |
strncpy(rp->ambfile, ambfile, sizeof(rp->ambfile)-1); |
| 256 |
rp->ambvwt = ambvwt; |
| 257 |
rp->ambacc = ambacc; |
| 258 |
rp->ambres = ambres; |
| 259 |
rp->ambdiv = ambdiv; |
| 260 |
rp->ambssamp = ambssamp; |
| 261 |
rp->ambounce = ambounce; |
| 262 |
rp->ambincl = ambincl; |
| 263 |
memset(rp->amblval, '\0', sizeof(rp->amblval)); |
| 264 |
ndx = 0; |
| 265 |
for (i = 0; i < AMBLLEN && amblist[i] != NULL; i++) { |
| 266 |
int len = strlen(amblist[i]); |
| 267 |
if (ndx+len >= sizeof(rp->amblval)) |
| 268 |
break; |
| 269 |
strcpy(rp->amblval+ndx, amblist[i]); |
| 270 |
ndx += len+1; |
| 271 |
} |
| 272 |
while (i <= AMBLLEN) |
| 273 |
rp->amblndx[i++] = -1; |
| 274 |
} |
| 275 |
|
| 276 |
|
| 277 |
void |
| 278 |
ray_restore( /* restore parameter settings */ |
| 279 |
RAYPARAMS *rp |
| 280 |
) |
| 281 |
{ |
| 282 |
register int i; |
| 283 |
|
| 284 |
if (rp == NULL) { /* restore defaults */ |
| 285 |
RAYPARAMS dflt; |
| 286 |
ray_defaults(&dflt); |
| 287 |
ray_restore(&dflt); |
| 288 |
return; |
| 289 |
} |
| 290 |
/* restore saved settings */ |
| 291 |
do_irrad = rp->do_irrad; |
| 292 |
dstrsrc = rp->dstrsrc; |
| 293 |
shadthresh = rp->shadthresh; |
| 294 |
shadcert = rp->shadcert; |
| 295 |
directrelay = rp->directrelay; |
| 296 |
vspretest = rp->vspretest; |
| 297 |
directvis = rp->directvis; |
| 298 |
srcsizerat = rp->srcsizerat; |
| 299 |
copycolor(cextinction, rp->cextinction); |
| 300 |
copycolor(salbedo, rp->salbedo); |
| 301 |
seccg = rp->seccg; |
| 302 |
ssampdist = rp->ssampdist; |
| 303 |
specthresh = rp->specthresh; |
| 304 |
specjitter = rp->specjitter; |
| 305 |
backvis = rp->backvis; |
| 306 |
maxdepth = rp->maxdepth; |
| 307 |
minweight = rp->minweight; |
| 308 |
copycolor(ambval, rp->ambval); |
| 309 |
ambvwt = rp->ambvwt; |
| 310 |
ambdiv = rp->ambdiv; |
| 311 |
ambssamp = rp->ambssamp; |
| 312 |
ambounce = rp->ambounce; |
| 313 |
for (i = 0; rp->amblndx[i] >= 0; i++) |
| 314 |
amblist[i] = rp->amblval + rp->amblndx[i]; |
| 315 |
while (i <= AMBLLEN) |
| 316 |
amblist[i++] = NULL; |
| 317 |
ambincl = rp->ambincl; |
| 318 |
/* update ambient calculation */ |
| 319 |
ambnotify(OVOID); |
| 320 |
if (thescene.cutree != EMPTY) { |
| 321 |
int newamb = (ambfile == NULL) ? rp->ambfile[0] : |
| 322 |
strcmp(ambfile, rp->ambfile) ; |
| 323 |
|
| 324 |
if (amblist[0] != NULL) |
| 325 |
for (i = 0; i < nobjects; i++) |
| 326 |
ambnotify(i); |
| 327 |
|
| 328 |
ambfile = (rp->ambfile[0]) ? rp->ambfile : (char *)NULL; |
| 329 |
if (newamb) { |
| 330 |
ambres = rp->ambres; |
| 331 |
ambacc = rp->ambacc; |
| 332 |
setambient(); |
| 333 |
} else { |
| 334 |
setambres(rp->ambres); |
| 335 |
setambacc(rp->ambacc); |
| 336 |
} |
| 337 |
} else { |
| 338 |
ambfile = (rp->ambfile[0]) ? rp->ambfile : (char *)NULL; |
| 339 |
ambres = rp->ambres; |
| 340 |
ambacc = rp->ambacc; |
| 341 |
} |
| 342 |
} |
| 343 |
|
| 344 |
|
| 345 |
void |
| 346 |
ray_defaults( /* get default parameter values */ |
| 347 |
RAYPARAMS *rp |
| 348 |
) |
| 349 |
{ |
| 350 |
int i; |
| 351 |
|
| 352 |
if (rp == NULL) |
| 353 |
return; |
| 354 |
|
| 355 |
rp->do_irrad = 0; |
| 356 |
rp->dstrsrc = 0.0; |
| 357 |
rp->shadthresh = .03; |
| 358 |
rp->shadcert = .75; |
| 359 |
rp->directrelay = 2; |
| 360 |
rp->vspretest = 512; |
| 361 |
rp->directvis = 1; |
| 362 |
rp->srcsizerat = .2; |
| 363 |
setcolor(rp->cextinction, 0., 0., 0.); |
| 364 |
setcolor(rp->salbedo, 0., 0., 0.); |
| 365 |
rp->seccg = 0.; |
| 366 |
rp->ssampdist = 0.; |
| 367 |
rp->specthresh = .15; |
| 368 |
rp->specjitter = 1.; |
| 369 |
rp->backvis = 1; |
| 370 |
rp->maxdepth = 8; |
| 371 |
rp->minweight = 2e-3; |
| 372 |
setcolor(rp->ambval, 0., 0., 0.); |
| 373 |
memset(rp->ambfile, '\0', sizeof(rp->ambfile)); |
| 374 |
rp->ambvwt = 0; |
| 375 |
rp->ambres = 256; |
| 376 |
rp->ambacc = 0.15; |
| 377 |
rp->ambdiv = 1024; |
| 378 |
rp->ambssamp = 512; |
| 379 |
rp->ambounce = 0; |
| 380 |
rp->ambincl = -1; |
| 381 |
memset(rp->amblval, '\0', sizeof(rp->amblval)); |
| 382 |
for (i = AMBLLEN+1; i--; ) |
| 383 |
rp->amblndx[i] = -1; |
| 384 |
} |
