| 1 |
#ifndef lint
|
| 2 |
static const char RCSid[] = "$Id$";
|
| 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 |
/* ====================================================================
|
| 11 |
* The Radiance Software License, Version 1.0
|
| 12 |
*
|
| 13 |
* Copyright (c) 1990 - 2002 The Regents of the University of California,
|
| 14 |
* through Lawrence Berkeley National Laboratory. All rights reserved.
|
| 15 |
*
|
| 16 |
* Redistribution and use in source and binary forms, with or without
|
| 17 |
* modification, are permitted provided that the following conditions
|
| 18 |
* are met:
|
| 19 |
*
|
| 20 |
* 1. Redistributions of source code must retain the above copyright
|
| 21 |
* notice, this list of conditions and the following disclaimer.
|
| 22 |
*
|
| 23 |
* 2. Redistributions in binary form must reproduce the above copyright
|
| 24 |
* notice, this list of conditions and the following disclaimer in
|
| 25 |
* the documentation and/or other materials provided with the
|
| 26 |
* distribution.
|
| 27 |
*
|
| 28 |
* 3. The end-user documentation included with the redistribution,
|
| 29 |
* if any, must include the following acknowledgment:
|
| 30 |
* "This product includes Radiance software
|
| 31 |
* (http://radsite.lbl.gov/)
|
| 32 |
* developed by the Lawrence Berkeley National Laboratory
|
| 33 |
* (http://www.lbl.gov/)."
|
| 34 |
* Alternately, this acknowledgment may appear in the software itself,
|
| 35 |
* if and wherever such third-party acknowledgments normally appear.
|
| 36 |
*
|
| 37 |
* 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
|
| 38 |
* and "The Regents of the University of California" must
|
| 39 |
* not be used to endorse or promote products derived from this
|
| 40 |
* software without prior written permission. For written
|
| 41 |
* permission, please contact [email protected].
|
| 42 |
*
|
| 43 |
* 5. Products derived from this software may not be called "Radiance",
|
| 44 |
* nor may "Radiance" appear in their name, without prior written
|
| 45 |
* permission of Lawrence Berkeley National Laboratory.
|
| 46 |
*
|
| 47 |
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
|
| 48 |
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
| 49 |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
| 50 |
* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
|
| 51 |
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
| 52 |
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
| 53 |
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
| 54 |
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
| 55 |
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
| 56 |
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
| 57 |
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
| 58 |
* SUCH DAMAGE.
|
| 59 |
* ====================================================================
|
| 60 |
*
|
| 61 |
* This software consists of voluntary contributions made by many
|
| 62 |
* individuals on behalf of Lawrence Berkeley National Laboratory. For more
|
| 63 |
* information on Lawrence Berkeley National Laboratory, please see
|
| 64 |
* <http://www.lbl.gov/>.
|
| 65 |
*/
|
| 66 |
|
| 67 |
/*
|
| 68 |
* These routines are designed to aid the programmer who wishes
|
| 69 |
* to call Radiance as a library. Unfortunately, the system was
|
| 70 |
* not originally intended to be run this way, and there are some
|
| 71 |
* awkward limitations to contend with. The most irritating
|
| 72 |
* perhaps is that the global variables and functions do not have
|
| 73 |
* a prefix, and the symbols are a bit generic. This results in a
|
| 74 |
* serious invasion of the calling application's name-space, and
|
| 75 |
* you may need to rename either some Radiance routines or some
|
| 76 |
* of your routines to avoid conflicts. Another limitation is
|
| 77 |
* that the global variables are not gathered together into any
|
| 78 |
* sort of context, so it is impossible to simultaneously run
|
| 79 |
* this library on multiple scenes or in multiple threads.
|
| 80 |
* You get one scene and one thread, and if you want more, you
|
| 81 |
* will have to go with the process model used by the programs
|
| 82 |
* gen/mkillum, hd/rholo, and px/pinterp. Finally, unrecoverable
|
| 83 |
* errors result in a call to the application-defined function
|
| 84 |
* quit(). The usual thing to do is to call exit().
|
| 85 |
* You might want to do something else instead, like
|
| 86 |
* call setjmp()/longjmp() to bring you back to the calling
|
| 87 |
* function for recovery. You may also wish to define your own
|
| 88 |
* wputs(s) and eputs(s) functions to output warning and error
|
| 89 |
* messages, respectively.
|
| 90 |
*
|
| 91 |
* With those caveats, we have attempted to make the interface
|
| 92 |
* as simple as we can. Global variables and their defaults
|
| 93 |
* are defined below, and including "ray.h" declares these
|
| 94 |
* along with all the routines you are likely to need. First,
|
| 95 |
* assign the global variable progname to your argv[0], then
|
| 96 |
* change the rendering parameters as you like. If you have a set
|
| 97 |
* of option arguments you are working from, the getrenderopt(ac,av)
|
| 98 |
* call should be very useful. Before tracing any rays, you
|
| 99 |
* must read in the octree with a call to ray_init(oct).
|
| 100 |
* Passing NULL for the file name causes ray_init() to read
|
| 101 |
* the octree from the standard input -- rarely a good idea.
|
| 102 |
* However, one may read an octree from a program (such as
|
| 103 |
* oconv) by preceding a shell command by a '!' character.
|
| 104 |
*
|
| 105 |
* To trace a ray, define a RAY object myRay and assign:
|
| 106 |
*
|
| 107 |
* myRay.rorg = ( ray origin point )
|
| 108 |
* myRay.rdir = ( normalized ray direction )
|
| 109 |
* myRay.rmax = ( maximum length, or zero for no limit )
|
| 110 |
*
|
| 111 |
* If you are rendering from a VIEW structure, this can be
|
| 112 |
* accomplished with a single call for the ray at (x,y):
|
| 113 |
*
|
| 114 |
* myRay.rmax = viewray(myRay.rorg, myRay.rdir, &myView, x, y);
|
| 115 |
*
|
| 116 |
* Then, trace the primary ray with:
|
| 117 |
*
|
| 118 |
* ray_trace(&myRay);
|
| 119 |
*
|
| 120 |
* The resulting contents of myRay should provide you with
|
| 121 |
* more than enough information about what the ray hit,
|
| 122 |
* the computed value, etc. For further clues of how to
|
| 123 |
* compute irradiance, how to get callbacks on the evaluated
|
| 124 |
* ray tree, etc., see the contents of rtrace.c. See
|
| 125 |
* also the rpmain.c, rtmain.c, and rvmain.c modules
|
| 126 |
* to learn more how rendering options are processed.
|
| 127 |
*
|
| 128 |
* When you are done, you may call ray_done(1) to clean
|
| 129 |
* up memory used by Radiance. It doesn't free everything,
|
| 130 |
* but it makes a valiant effort. If you call ray_done(0),
|
| 131 |
* it leaves data that is likely to be reused, including
|
| 132 |
* loaded data files and fonts. The library may be
|
| 133 |
* restarted at any point by calling ray_init() on a new
|
| 134 |
* octree.
|
| 135 |
*
|
| 136 |
* The call ray_save(rp) allocates and returns a buffer
|
| 137 |
* with the current global parameter settings, which may be
|
| 138 |
* restored at any time with a call to ray_restore(rp).
|
| 139 |
* This buffer contains no linked information, and thus
|
| 140 |
* may be passed between processes using write() and
|
| 141 |
* read() calls, so long as byte order is maintained.
|
| 142 |
* Calling ray_restore(NULL) restores the original
|
| 143 |
* default parameters, which is also retrievable with
|
| 144 |
* the call ray_defaults(rp). (These should be the
|
| 145 |
* same as the defaults for rtrace.)
|
| 146 |
*/
|
| 147 |
|
| 148 |
#include "ray.h"
|
| 149 |
|
| 150 |
#include "source.h"
|
| 151 |
|
| 152 |
#include "ambient.h"
|
| 153 |
|
| 154 |
#include "otypes.h"
|
| 155 |
|
| 156 |
#include "random.h"
|
| 157 |
|
| 158 |
#include "data.h"
|
| 159 |
|
| 160 |
#include "font.h"
|
| 161 |
|
| 162 |
char *progname = "unknown_app"; /* caller sets to argv[0] */
|
| 163 |
|
| 164 |
char *octname; /* octree name we are given */
|
| 165 |
|
| 166 |
char *shm_boundary = NULL; /* boundary of shared memory */
|
| 167 |
|
| 168 |
CUBE thescene; /* our scene */
|
| 169 |
OBJECT nsceneobjs; /* number of objects in our scene */
|
| 170 |
|
| 171 |
int dimlist[MAXDIM]; /* sampling dimensions */
|
| 172 |
int ndims = 0; /* number of sampling dimensions */
|
| 173 |
int samplendx = 0; /* index for this sample */
|
| 174 |
|
| 175 |
void (*trace)() = NULL; /* trace call */
|
| 176 |
|
| 177 |
extern void ambnotify();
|
| 178 |
void (*addobjnotify[])() = {ambnotify, NULL};
|
| 179 |
|
| 180 |
int do_irrad = 0; /* compute irradiance? */
|
| 181 |
|
| 182 |
double dstrsrc = 0.0; /* square source distribution */
|
| 183 |
double shadthresh = .05; /* shadow threshold */
|
| 184 |
double shadcert = .5; /* shadow certainty */
|
| 185 |
int directrelay = 2; /* number of source relays */
|
| 186 |
int vspretest = 512; /* virtual source pretest density */
|
| 187 |
int directvis = 1; /* sources visible? */
|
| 188 |
double srcsizerat = .2; /* maximum ratio source size/dist. */
|
| 189 |
|
| 190 |
COLOR cextinction = BLKCOLOR; /* global extinction coefficient */
|
| 191 |
COLOR salbedo = BLKCOLOR; /* global scattering albedo */
|
| 192 |
double seccg = 0.; /* global scattering eccentricity */
|
| 193 |
double ssampdist = 0.; /* scatter sampling distance */
|
| 194 |
|
| 195 |
double specthresh = .15; /* specular sampling threshold */
|
| 196 |
double specjitter = 1.; /* specular sampling jitter */
|
| 197 |
|
| 198 |
int backvis = 1; /* back face visibility */
|
| 199 |
|
| 200 |
int maxdepth = 6; /* maximum recursion depth */
|
| 201 |
double minweight = 4e-3; /* minimum ray weight */
|
| 202 |
|
| 203 |
char *ambfile = NULL; /* ambient file name */
|
| 204 |
COLOR ambval = BLKCOLOR; /* ambient value */
|
| 205 |
int ambvwt = 0; /* initial weight for ambient value */
|
| 206 |
double ambacc = 0.2; /* ambient accuracy */
|
| 207 |
int ambres = 128; /* ambient resolution */
|
| 208 |
int ambdiv = 512; /* ambient divisions */
|
| 209 |
int ambssamp = 0; /* ambient super-samples */
|
| 210 |
int ambounce = 0; /* ambient bounces */
|
| 211 |
char *amblist[AMBLLEN+1]; /* ambient include/exclude list */
|
| 212 |
int ambincl = -1; /* include == 1, exclude == 0 */
|
| 213 |
|
| 214 |
|
| 215 |
void
|
| 216 |
ray_init(otnm) /* initialize ray-tracing calculation */
|
| 217 |
char *otnm;
|
| 218 |
{
|
| 219 |
if (nobjects > 0) /* free old scene data */
|
| 220 |
ray_done(0);
|
| 221 |
/* initialize object types */
|
| 222 |
if (ofun[OBJ_SPHERE].funp == o_default)
|
| 223 |
initotypes();
|
| 224 |
/* initialize urand */
|
| 225 |
if (urperm == NULL)
|
| 226 |
initurand(2048);
|
| 227 |
/* read scene octree */
|
| 228 |
readoct(octname = otnm, ~(IO_FILES|IO_INFO), &thescene, NULL);
|
| 229 |
nsceneobjs = nobjects;
|
| 230 |
/* find and mark sources */
|
| 231 |
marksources();
|
| 232 |
/* initialize ambient calculation */
|
| 233 |
setambient();
|
| 234 |
/* ready to go... */
|
| 235 |
}
|
| 236 |
|
| 237 |
|
| 238 |
void
|
| 239 |
ray_trace(RAY *r) /* trace a primary ray */
|
| 240 |
{
|
| 241 |
rayorigin(r, NULL, PRIMARY, 1.0);
|
| 242 |
samplendx++;
|
| 243 |
rayvalue(r); /* assumes origin and direction are set */
|
| 244 |
}
|
| 245 |
|
| 246 |
|
| 247 |
void
|
| 248 |
ray_done(freall) /* free ray-tracing data */
|
| 249 |
int freall;
|
| 250 |
{
|
| 251 |
retainfonts = 1;
|
| 252 |
ambdone();
|
| 253 |
ambnotify(OVOID);
|
| 254 |
freesources();
|
| 255 |
freeobjects(0, nobjects);
|
| 256 |
donesets();
|
| 257 |
octdone();
|
| 258 |
thescene.cutree = EMPTY;
|
| 259 |
octname = NULL;
|
| 260 |
if (freall) {
|
| 261 |
retainfonts = 0;
|
| 262 |
freefont(NULL);
|
| 263 |
freedata(NULL);
|
| 264 |
initurand(0);
|
| 265 |
}
|
| 266 |
if (nobjects > 0) {
|
| 267 |
sprintf(errmsg, "%d objects left after call to ray_done()",
|
| 268 |
nobjects);
|
| 269 |
error(WARNING, errmsg);
|
| 270 |
}
|
| 271 |
}
|
| 272 |
|
| 273 |
|
| 274 |
void
|
| 275 |
ray_save(rp) /* save current parameter settings */
|
| 276 |
RAYPARAMS *rp;
|
| 277 |
{
|
| 278 |
int i, ndx;
|
| 279 |
|
| 280 |
if (rp == NULL)
|
| 281 |
return;
|
| 282 |
rp->do_irrad = do_irrad;
|
| 283 |
rp->dstrsrc = dstrsrc;
|
| 284 |
rp->shadthresh = shadthresh;
|
| 285 |
rp->shadcert = shadcert;
|
| 286 |
rp->directrelay = directrelay;
|
| 287 |
rp->vspretest = vspretest;
|
| 288 |
rp->directvis = directvis;
|
| 289 |
rp->srcsizerat = srcsizerat;
|
| 290 |
copycolor(rp->cextinction, cextinction);
|
| 291 |
copycolor(rp->salbedo, salbedo);
|
| 292 |
rp->seccg = seccg;
|
| 293 |
rp->ssampdist = ssampdist;
|
| 294 |
rp->specthresh = specthresh;
|
| 295 |
rp->specjitter = specjitter;
|
| 296 |
rp->backvis = backvis;
|
| 297 |
rp->maxdepth = maxdepth;
|
| 298 |
rp->minweight = minweight;
|
| 299 |
copycolor(rp->ambval, ambval);
|
| 300 |
bzero(rp->ambfile, sizeof(rp->ambfile));
|
| 301 |
if (ambfile != NULL)
|
| 302 |
strncpy(rp->ambfile, ambfile, sizeof(rp->ambfile)-1);
|
| 303 |
rp->ambvwt = ambvwt;
|
| 304 |
rp->ambacc = ambacc;
|
| 305 |
rp->ambres = ambres;
|
| 306 |
rp->ambdiv = ambdiv;
|
| 307 |
rp->ambssamp = ambssamp;
|
| 308 |
rp->ambounce = ambounce;
|
| 309 |
rp->ambincl = ambincl;
|
| 310 |
bzero(rp->amblval, sizeof(rp->amblval));
|
| 311 |
ndx = 0;
|
| 312 |
for (i = 0; i < AMBLLEN && amblist[i] != NULL; i++) {
|
| 313 |
int len = strlen(amblist[i]);
|
| 314 |
if (ndx+len >= sizeof(rp->amblval))
|
| 315 |
break;
|
| 316 |
strcpy(rp->amblval+ndx, amblist[i]);
|
| 317 |
ndx += len+1;
|
| 318 |
}
|
| 319 |
while (i <= AMBLLEN)
|
| 320 |
rp->amblndx[i++] = -1;
|
| 321 |
}
|
| 322 |
|
| 323 |
|
| 324 |
void
|
| 325 |
ray_restore(rp) /* restore parameter settings */
|
| 326 |
RAYPARAMS *rp;
|
| 327 |
{
|
| 328 |
register int i;
|
| 329 |
|
| 330 |
if (rp == NULL) { /* restore defaults */
|
| 331 |
RAYPARAMS dflt;
|
| 332 |
ray_defaults(&dflt);
|
| 333 |
ray_restore(&dflt);
|
| 334 |
return;
|
| 335 |
}
|
| 336 |
/* restore saved settings */
|
| 337 |
do_irrad = rp->do_irrad;
|
| 338 |
dstrsrc = rp->dstrsrc;
|
| 339 |
shadthresh = rp->shadthresh;
|
| 340 |
shadcert = rp->shadcert;
|
| 341 |
directrelay = rp->directrelay;
|
| 342 |
vspretest = rp->vspretest;
|
| 343 |
directvis = rp->directvis;
|
| 344 |
srcsizerat = rp->srcsizerat;
|
| 345 |
copycolor(cextinction, rp->cextinction);
|
| 346 |
copycolor(salbedo, rp->salbedo);
|
| 347 |
seccg = rp->seccg;
|
| 348 |
ssampdist = rp->ssampdist;
|
| 349 |
specthresh = rp->specthresh;
|
| 350 |
specjitter = rp->specjitter;
|
| 351 |
backvis = rp->backvis;
|
| 352 |
maxdepth = rp->maxdepth;
|
| 353 |
minweight = rp->minweight;
|
| 354 |
copycolor(ambval, rp->ambval);
|
| 355 |
ambvwt = rp->ambvwt;
|
| 356 |
ambdiv = rp->ambdiv;
|
| 357 |
ambssamp = rp->ambssamp;
|
| 358 |
ambounce = rp->ambounce;
|
| 359 |
for (i = 0; rp->amblndx[i] >= 0; i++)
|
| 360 |
amblist[i] = rp->amblval + rp->amblndx[i];
|
| 361 |
while (i <= AMBLLEN)
|
| 362 |
amblist[i++] = NULL;
|
| 363 |
ambincl = rp->ambincl;
|
| 364 |
/* update ambient calculation */
|
| 365 |
ambnotify(OVOID);
|
| 366 |
if (thescene.cutree != EMPTY) {
|
| 367 |
int newamb = (ambfile == NULL) ? rp->ambfile[0] :
|
| 368 |
strcmp(ambfile, rp->ambfile) ;
|
| 369 |
|
| 370 |
if (amblist[0] != NULL)
|
| 371 |
for (i = 0; i < nobjects; i++)
|
| 372 |
ambnotify(i);
|
| 373 |
|
| 374 |
ambfile = (rp->ambfile[0]) ? rp->ambfile : (char *)NULL;
|
| 375 |
if (newamb) {
|
| 376 |
ambres = rp->ambres;
|
| 377 |
ambacc = rp->ambacc;
|
| 378 |
setambient();
|
| 379 |
} else {
|
| 380 |
setambres(rp->ambres);
|
| 381 |
setambacc(rp->ambacc);
|
| 382 |
}
|
| 383 |
} else {
|
| 384 |
ambfile = (rp->ambfile[0]) ? rp->ambfile : (char *)NULL;
|
| 385 |
ambres = rp->ambres;
|
| 386 |
ambacc = rp->ambacc;
|
| 387 |
}
|
| 388 |
}
|
| 389 |
|
| 390 |
|
| 391 |
void
|
| 392 |
ray_defaults(rp) /* get default parameter values */
|
| 393 |
RAYPARAMS *rp;
|
| 394 |
{
|
| 395 |
int i;
|
| 396 |
|
| 397 |
if (rp == NULL)
|
| 398 |
return;
|
| 399 |
|
| 400 |
rp->do_irrad = 0;
|
| 401 |
rp->dstrsrc = 0.0;
|
| 402 |
rp->shadthresh = .05;
|
| 403 |
rp->shadcert = .5;
|
| 404 |
rp->directrelay = 2;
|
| 405 |
rp->vspretest = 512;
|
| 406 |
rp->directvis = 1;
|
| 407 |
rp->srcsizerat = .2;
|
| 408 |
setcolor(rp->cextinction, 0., 0., 0.);
|
| 409 |
setcolor(rp->salbedo, 0., 0., 0.);
|
| 410 |
rp->seccg = 0.;
|
| 411 |
rp->ssampdist = 0.;
|
| 412 |
rp->specthresh = .15;
|
| 413 |
rp->specjitter = 1.;
|
| 414 |
rp->backvis = 1;
|
| 415 |
rp->maxdepth = 6;
|
| 416 |
rp->minweight = 4e-3;
|
| 417 |
setcolor(rp->ambval, 0., 0., 0.);
|
| 418 |
bzero(rp->ambfile, sizeof(rp->ambfile));
|
| 419 |
rp->ambvwt = 0;
|
| 420 |
rp->ambres = 128;
|
| 421 |
rp->ambacc = 0.2;
|
| 422 |
rp->ambdiv = 512;
|
| 423 |
rp->ambssamp = 0;
|
| 424 |
rp->ambounce = 0;
|
| 425 |
rp->ambincl = -1;
|
| 426 |
bzero(rp->amblval, sizeof(rp->amblval));
|
| 427 |
for (i = AMBLLEN+1; i--; )
|
| 428 |
rp->amblndx[i] = -1;
|
| 429 |
}
|
