| 1 |
– |
/* Copyright (c) 1991 Regents of the University of California */ |
| 2 |
– |
|
| 1 |
|
#ifndef lint |
| 2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
| 2 |
> |
static const char RCSid[] = "$Id$"; |
| 3 |
|
#endif |
| 6 |
– |
|
| 4 |
|
/* |
| 5 |
|
* Shading for materials with arbitrary BRDF's |
| 6 |
|
*/ |
| 7 |
|
|
| 8 |
+ |
/* ==================================================================== |
| 9 |
+ |
* The Radiance Software License, Version 1.0 |
| 10 |
+ |
* |
| 11 |
+ |
* Copyright (c) 1990 - 2002 The Regents of the University of California, |
| 12 |
+ |
* through Lawrence Berkeley National Laboratory. All rights reserved. |
| 13 |
+ |
* |
| 14 |
+ |
* Redistribution and use in source and binary forms, with or without |
| 15 |
+ |
* modification, are permitted provided that the following conditions |
| 16 |
+ |
* are met: |
| 17 |
+ |
* |
| 18 |
+ |
* 1. Redistributions of source code must retain the above copyright |
| 19 |
+ |
* notice, this list of conditions and the following disclaimer. |
| 20 |
+ |
* |
| 21 |
+ |
* 2. Redistributions in binary form must reproduce the above copyright |
| 22 |
+ |
* notice, this list of conditions and the following disclaimer in |
| 23 |
+ |
* the documentation and/or other materials provided with the |
| 24 |
+ |
* distribution. |
| 25 |
+ |
* |
| 26 |
+ |
* 3. The end-user documentation included with the redistribution, |
| 27 |
+ |
* if any, must include the following acknowledgment: |
| 28 |
+ |
* "This product includes Radiance software |
| 29 |
+ |
* (http://radsite.lbl.gov/) |
| 30 |
+ |
* developed by the Lawrence Berkeley National Laboratory |
| 31 |
+ |
* (http://www.lbl.gov/)." |
| 32 |
+ |
* Alternately, this acknowledgment may appear in the software itself, |
| 33 |
+ |
* if and wherever such third-party acknowledgments normally appear. |
| 34 |
+ |
* |
| 35 |
+ |
* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
| 36 |
+ |
* and "The Regents of the University of California" must |
| 37 |
+ |
* not be used to endorse or promote products derived from this |
| 38 |
+ |
* software without prior written permission. For written |
| 39 |
+ |
* permission, please contact [email protected]. |
| 40 |
+ |
* |
| 41 |
+ |
* 5. Products derived from this software may not be called "Radiance", |
| 42 |
+ |
* nor may "Radiance" appear in their name, without prior written |
| 43 |
+ |
* permission of Lawrence Berkeley National Laboratory. |
| 44 |
+ |
* |
| 45 |
+ |
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| 46 |
+ |
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 47 |
+ |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 48 |
+ |
* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
| 49 |
+ |
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 50 |
+ |
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 51 |
+ |
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| 52 |
+ |
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| 53 |
+ |
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 54 |
+ |
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 55 |
+ |
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 56 |
+ |
* SUCH DAMAGE. |
| 57 |
+ |
* ==================================================================== |
| 58 |
+ |
* |
| 59 |
+ |
* This software consists of voluntary contributions made by many |
| 60 |
+ |
* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
| 61 |
+ |
* information on Lawrence Berkeley National Laboratory, please see |
| 62 |
+ |
* <http://www.lbl.gov/>. |
| 63 |
+ |
*/ |
| 64 |
+ |
|
| 65 |
|
#include "ray.h" |
| 66 |
|
|
| 67 |
|
#include "data.h" |
| 132 |
|
} BRDFDAT; /* BRDF material data */ |
| 133 |
|
|
| 134 |
|
|
| 135 |
+ |
static void |
| 136 |
|
dirbrdf(cval, np, ldir, omega) /* compute source contribution */ |
| 137 |
|
COLOR cval; /* returned coefficient */ |
| 138 |
|
register BRDFDAT *np; /* material data */ |
| 143 |
|
double dtmp; |
| 144 |
|
COLOR ctmp; |
| 145 |
|
FVECT ldx; |
| 146 |
< |
double lddx[3], pt[MAXDIM]; |
| 92 |
< |
double vldx[4]; |
| 146 |
> |
static double vldx[5], pt[MAXDIM]; |
| 147 |
|
register char **sa; |
| 148 |
|
register int i; |
| 149 |
+ |
#define lddx (vldx+1) |
| 150 |
|
|
| 151 |
|
setcolor(cval, 0.0, 0.0, 0.0); |
| 152 |
|
|
| 187 |
|
multv3(ldx, ldir, funcxf.xfm); |
| 188 |
|
for (i = 0; i < 3; i++) |
| 189 |
|
lddx[i] = ldx[i]/funcxf.sca; |
| 190 |
+ |
lddx[3] = omega; |
| 191 |
|
/* compute BRTDF */ |
| 192 |
|
if (np->mp->otype == MAT_BRTDF) { |
| 193 |
|
if (sa[6][0] == '0') /* special case */ |
| 194 |
|
colval(ctmp,RED) = 0.0; |
| 195 |
|
else |
| 196 |
< |
colval(ctmp,RED) = funvalue(sa[6], 3, lddx); |
| 196 |
> |
colval(ctmp,RED) = funvalue(sa[6], 4, lddx); |
| 197 |
|
if (!strcmp(sa[7],sa[6])) |
| 198 |
|
colval(ctmp,GRN) = colval(ctmp,RED); |
| 199 |
|
else |
| 200 |
< |
colval(ctmp,GRN) = funvalue(sa[7], 3, lddx); |
| 200 |
> |
colval(ctmp,GRN) = funvalue(sa[7], 4, lddx); |
| 201 |
|
if (!strcmp(sa[8],sa[6])) |
| 202 |
|
colval(ctmp,BLU) = colval(ctmp,RED); |
| 203 |
|
else if (!strcmp(sa[8],sa[7])) |
| 204 |
|
colval(ctmp,BLU) = colval(ctmp,GRN); |
| 205 |
|
else |
| 206 |
< |
colval(ctmp,BLU) = funvalue(sa[8], 3, lddx); |
| 206 |
> |
colval(ctmp,BLU) = funvalue(sa[8], 4, lddx); |
| 207 |
|
dtmp = bright(ctmp); |
| 208 |
|
} else if (np->dp == NULL) { |
| 209 |
< |
dtmp = funvalue(sa[0], 3, lddx); |
| 209 |
> |
dtmp = funvalue(sa[0], 4, lddx); |
| 210 |
|
setcolor(ctmp, dtmp, dtmp, dtmp); |
| 211 |
|
} else { |
| 212 |
|
for (i = 0; i < np->dp->nd; i++) |
| 213 |
< |
pt[i] = funvalue(sa[3+i], 3, lddx); |
| 213 |
> |
pt[i] = funvalue(sa[3+i], 4, lddx); |
| 214 |
|
vldx[0] = datavalue(np->dp, pt); |
| 215 |
< |
vldx[1] = lddx[0]; vldx[2] = lddx[1]; vldx[3] = lddx[2]; |
| 160 |
< |
dtmp = funvalue(sa[0], 4, vldx); |
| 215 |
> |
dtmp = funvalue(sa[0], 5, vldx); |
| 216 |
|
setcolor(ctmp, dtmp, dtmp, dtmp); |
| 217 |
|
} |
| 218 |
|
if (errno) { |
| 240 |
|
scalecolor(ctmp, dtmp); |
| 241 |
|
addcolor(cval, ctmp); |
| 242 |
|
} |
| 243 |
+ |
#undef lddx |
| 244 |
|
} |
| 245 |
|
|
| 246 |
|
|
| 247 |
< |
m_brdf(m, r) /* color a ray which hit a BRDTF material */ |
| 247 |
> |
int |
| 248 |
> |
m_brdf(m, r) /* color a ray that hit a BRDTfunc material */ |
| 249 |
|
register OBJREC *m; |
| 250 |
|
register RAY *r; |
| 251 |
|
{ |
| 252 |
+ |
int hitfront = 1; |
| 253 |
|
BRDFDAT nd; |
| 254 |
|
RAY sr; |
| 255 |
|
double transtest, transdist; |
| 256 |
|
int hasrefl, hastrans; |
| 257 |
|
COLOR ctmp; |
| 258 |
+ |
FVECT vtmp; |
| 259 |
|
register MFUNC *mf; |
| 260 |
|
register int i; |
| 261 |
|
/* check arguments */ |
| 288 |
|
nd.pnorm[i] = -nd.pnorm[i]; |
| 289 |
|
r->pert[i] = -r->pert[i]; |
| 290 |
|
} |
| 291 |
+ |
hitfront = 0; |
| 292 |
|
} |
| 293 |
|
copycolor(nd.mcolor, r->pcol); /* get pattern color */ |
| 294 |
|
multcolor(nd.rdiff, nd.mcolor); /* modify diffuse values */ |
| 328 |
|
transdist = r->rot + sr.rt; |
| 329 |
|
} |
| 330 |
|
if (r->crtype & SHADOW) /* the rest is shadow */ |
| 331 |
< |
return; |
| 331 |
> |
return(1); |
| 332 |
|
/* compute reflected ray */ |
| 333 |
|
setbrdfunc(&nd); |
| 334 |
|
errno = 0; |
| 346 |
|
} |
| 347 |
|
/* compute ambient */ |
| 348 |
|
if (hasrefl) { |
| 349 |
< |
if (nd.pdot < 0.0) |
| 349 |
> |
if (!hitfront) |
| 350 |
|
flipsurface(r); |
| 351 |
< |
ambient(ctmp, r); |
| 351 |
> |
ambient(ctmp, r, nd.pnorm); |
| 352 |
|
multcolor(ctmp, nd.rdiff); |
| 353 |
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
| 354 |
< |
if (nd.pdot < 0.0) |
| 354 |
> |
if (!hitfront) |
| 355 |
|
flipsurface(r); |
| 356 |
|
} |
| 357 |
|
if (hastrans) { /* from other side */ |
| 358 |
< |
if (nd.pdot > 0.0) |
| 358 |
> |
if (hitfront) |
| 359 |
|
flipsurface(r); |
| 360 |
< |
ambient(ctmp, r); |
| 360 |
> |
vtmp[0] = -nd.pnorm[0]; |
| 361 |
> |
vtmp[1] = -nd.pnorm[1]; |
| 362 |
> |
vtmp[2] = -nd.pnorm[2]; |
| 363 |
> |
ambient(ctmp, r, vtmp); |
| 364 |
|
multcolor(ctmp, nd.tdiff); |
| 365 |
|
addcolor(r->rcol, ctmp); |
| 366 |
< |
if (nd.pdot > 0.0) |
| 366 |
> |
if (hitfront) |
| 367 |
|
flipsurface(r); |
| 368 |
|
} |
| 369 |
|
if (hasrefl | hastrans || m->oargs.sarg[6][0] != '0') |
| 371 |
|
/* check distance */ |
| 372 |
|
if (transtest > bright(r->rcol)) |
| 373 |
|
r->rt = transdist; |
| 374 |
+ |
|
| 375 |
+ |
return(1); |
| 376 |
|
} |
| 377 |
|
|
| 378 |
|
|
| 379 |
|
|
| 380 |
< |
m_brdf2(m, r) /* color a ray which hit a BRDF material */ |
| 380 |
> |
int |
| 381 |
> |
m_brdf2(m, r) /* color a ray that hit a BRDF material */ |
| 382 |
|
register OBJREC *m; |
| 383 |
|
register RAY *r; |
| 384 |
|
{ |
| 385 |
|
BRDFDAT nd; |
| 386 |
|
COLOR ctmp; |
| 387 |
+ |
FVECT vtmp; |
| 388 |
|
double dtmp; |
| 389 |
|
/* always a shadow */ |
| 390 |
|
if (r->crtype & SHADOW) |
| 391 |
< |
return; |
| 391 |
> |
return(1); |
| 392 |
|
/* check arguments */ |
| 393 |
|
if (m->oargs.nsargs < (hasdata(m->otype)?4:2) | m->oargs.nfargs < |
| 394 |
|
(m->otype==MAT_TFUNC|m->otype==MAT_TDATA?6:4)) |
| 414 |
|
/* compute reflectance */ |
| 415 |
|
dtmp = 1.0 - nd.trans - nd.rspec; |
| 416 |
|
setcolor(nd.rdiff, dtmp, dtmp, dtmp); |
| 417 |
< |
/* fix orientation */ |
| 418 |
< |
if (r->rod < 0.0) |
| 419 |
< |
flipsurface(r); |
| 417 |
> |
/* check for back side */ |
| 418 |
> |
if (r->rod < 0.0) { |
| 419 |
> |
if (!backvis && m->otype != MAT_TFUNC |
| 420 |
> |
&& m->otype != MAT_TDATA) { |
| 421 |
> |
raytrans(r); |
| 422 |
> |
return(1); |
| 423 |
> |
} |
| 424 |
> |
flipsurface(r); /* reorient if backvis */ |
| 425 |
> |
} |
| 426 |
|
/* get modifiers */ |
| 427 |
|
raytexture(r, m->omod); |
| 428 |
|
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
| 439 |
|
} |
| 440 |
|
/* compute ambient */ |
| 441 |
|
if (nd.trans < 1.0-FTINY) { |
| 442 |
< |
ambient(ctmp, r); |
| 442 |
> |
ambient(ctmp, r, nd.pnorm); |
| 443 |
|
scalecolor(ctmp, 1.0-nd.trans); |
| 444 |
|
multcolor(ctmp, nd.mcolor); /* modified by material color */ |
| 445 |
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
| 446 |
|
} |
| 447 |
|
if (nd.trans > FTINY) { /* from other side */ |
| 448 |
|
flipsurface(r); |
| 449 |
< |
ambient(ctmp, r); |
| 449 |
> |
vtmp[0] = -nd.pnorm[0]; |
| 450 |
> |
vtmp[1] = -nd.pnorm[1]; |
| 451 |
> |
vtmp[2] = -nd.pnorm[2]; |
| 452 |
> |
ambient(ctmp, r, vtmp); |
| 453 |
|
scalecolor(ctmp, nd.trans); |
| 454 |
|
multcolor(ctmp, nd.mcolor); |
| 455 |
|
addcolor(r->rcol, ctmp); |
| 457 |
|
} |
| 458 |
|
/* add direct component */ |
| 459 |
|
direct(r, dirbrdf, &nd); |
| 460 |
+ |
|
| 461 |
+ |
return(1); |
| 462 |
|
} |
| 463 |
|
|
| 464 |
|
|
| 465 |
+ |
int |
| 466 |
|
setbrdfunc(np) /* set up brdf function and variables */ |
| 467 |
|
register BRDFDAT *np; |
| 468 |
|
{ |
