--- ray/src/rt/aniso.c 2003/02/22 02:07:28 2.34 +++ ray/src/rt/aniso.c 2011/10/26 03:44:56 2.52 @@ -1,73 +1,18 @@ #ifndef lint -static const char RCSid[] = "$Id: aniso.c,v 2.34 2003/02/22 02:07:28 greg Exp $"; +static const char RCSid[] = "$Id: aniso.c,v 2.52 2011/10/26 03:44:56 greg Exp $"; #endif /* * Shading functions for anisotropic materials. */ -/* ==================================================================== - * The Radiance Software License, Version 1.0 - * - * Copyright (c) 1990 - 2002 The Regents of the University of California, - * through Lawrence Berkeley National Laboratory. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * - * 3. The end-user documentation included with the redistribution, - * if any, must include the following acknowledgment: - * "This product includes Radiance software - * (http://radsite.lbl.gov/) - * developed by the Lawrence Berkeley National Laboratory - * (http://www.lbl.gov/)." - * Alternately, this acknowledgment may appear in the software itself, - * if and wherever such third-party acknowledgments normally appear. - * - * 4. The names "Radiance," "Lawrence Berkeley National Laboratory" - * and "The Regents of the University of California" must - * not be used to endorse or promote products derived from this - * software without prior written permission. For written - * permission, please contact radiance@radsite.lbl.gov. - * - * 5. Products derived from this software may not be called "Radiance", - * nor may "Radiance" appear in their name, without prior written - * permission of Lawrence Berkeley National Laboratory. - * - * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED - * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE - * DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR - * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF - * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND - * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, - * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT - * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * ==================================================================== - * - * This software consists of voluntary contributions made by many - * individuals on behalf of Lawrence Berkeley National Laboratory. For more - * information on Lawrence Berkeley National Laboratory, please see - * . - */ +#include "copyright.h" #include "ray.h" - +#include "ambient.h" #include "otypes.h" - +#include "rtotypes.h" +#include "source.h" #include "func.h" - #include "random.h" #ifndef MAXITER @@ -115,17 +60,20 @@ typedef struct { double pdot; /* perturbed dot product */ } ANISODAT; /* anisotropic material data */ -static void getacoords(); -static void agaussamp(); +static srcdirf_t diraniso; +static void getacoords(RAY *r, ANISODAT *np); +static void agaussamp(RAY *r, ANISODAT *np); static void -diraniso(cval, np, ldir, omega) /* compute source contribution */ -COLOR cval; /* returned coefficient */ -register ANISODAT *np; /* material data */ -FVECT ldir; /* light source direction */ -double omega; /* light source size */ +diraniso( /* compute source contribution */ + COLOR cval, /* returned coefficient */ + void *nnp, /* material data */ + FVECT ldir, /* light source direction */ + double omega /* light source size */ +) { + register ANISODAT *np = nnp; double ldot; double dtmp, dtmp1, dtmp2; FVECT h; @@ -146,18 +94,18 @@ double omega; /* light source size */ * modified by the color of the material. */ copycolor(ctmp, np->mcolor); - dtmp = ldot * omega * np->rdiff / PI; + dtmp = ldot * omega * np->rdiff * (1.0/PI); scalecolor(ctmp, dtmp); addcolor(cval, ctmp); } if (ldot > FTINY && (np->specfl&(SP_REFL|SP_BADU)) == SP_REFL) { /* * Compute specular reflection coefficient using - * anisotropic gaussian distribution model. + * anisotropic Gaussian distribution model. */ /* add source width if flat */ if (np->specfl & SP_FLAT) - au2 = av2 = omega/(4.0*PI); + au2 = av2 = omega * (0.25/PI); else au2 = av2 = 0.0; au2 += np->u_alpha*np->u_alpha; @@ -171,15 +119,16 @@ double omega; /* light source size */ dtmp1 *= dtmp1 / au2; dtmp2 = DOT(np->v, h); dtmp2 *= dtmp2 / av2; - /* gaussian */ + /* new W-G-M-D model */ dtmp = DOT(np->pnorm, h); - dtmp = (dtmp1 + dtmp2) / (dtmp*dtmp); - dtmp = exp(-dtmp) * (0.25/PI) - * sqrt(ldot/(np->pdot*au2*av2)); + dtmp *= dtmp; + dtmp1 = (dtmp1 + dtmp2) / dtmp; + dtmp = exp(-dtmp1) * DOT(h,h) / + (PI * dtmp*dtmp * sqrt(au2*av2)); /* worth using? */ if (dtmp > FTINY) { copycolor(ctmp, np->scolor); - dtmp *= omega; + dtmp *= ldot * omega; scalecolor(ctmp, dtmp); addcolor(cval, ctmp); } @@ -189,7 +138,7 @@ double omega; /* light source size */ * Compute diffuse transmission. */ copycolor(ctmp, np->mcolor); - dtmp = -ldot * omega * np->tdiff / PI; + dtmp = -ldot * omega * np->tdiff * (1.0/PI); scalecolor(ctmp, dtmp); addcolor(cval, ctmp); } @@ -199,7 +148,7 @@ double omega; /* light source size */ * is always modified by material color. */ /* roughness + source */ - au2 = av2 = omega / PI; + au2 = av2 = omega * (1.0/PI); au2 += np->u_alpha*np->u_alpha; av2 += np->v_alpha*np->v_alpha; /* "half vector" */ @@ -219,9 +168,8 @@ double omega; /* light source size */ } } else dtmp = 0.0; - /* gaussian */ - dtmp = exp(-dtmp) * (1.0/PI) - * sqrt(-ldot/(np->pdot*au2*av2)); + /* Gaussian */ + dtmp = exp(-dtmp) * (1.0/PI) * sqrt(-ldot/(np->pdot*au2*av2)); /* worth using? */ if (dtmp > FTINY) { copycolor(ctmp, np->mcolor); @@ -233,10 +181,11 @@ double omega; /* light source size */ } -int -m_aniso(m, r) /* shade ray that hit something anisotropic */ -register OBJREC *m; -register RAY *r; +extern int +m_aniso( /* shade ray that hit something anisotropic */ + register OBJREC *m, + register RAY *r +) { ANISODAT nd; COLOR ctmp; @@ -247,9 +196,19 @@ register RAY *r; if (m->oargs.nfargs != (m->otype == MAT_TRANS2 ? 8 : 6)) objerror(m, USER, "bad number of real arguments"); + /* check for back side */ + if (r->rod < 0.0) { + if (!backvis && m->otype != MAT_TRANS2) { + raytrans(r); + return(1); + } + raytexture(r, m->omod); + flipsurface(r); /* reorient if backvis */ + } else + raytexture(r, m->omod); + /* get material color */ nd.mp = m; nd.rp = r; - /* get material color */ setcolor(nd.mcolor, m->oargs.farg[0], m->oargs.farg[1], m->oargs.farg[2]); @@ -257,18 +216,9 @@ register RAY *r; nd.specfl = 0; nd.u_alpha = m->oargs.farg[4]; nd.v_alpha = m->oargs.farg[5]; - if (nd.u_alpha < FTINY || nd.v_alpha <= FTINY) + if (nd.u_alpha <= FTINY || nd.v_alpha <= FTINY) objerror(m, USER, "roughness too small"); - /* check for back side */ - if (r->rod < 0.0) { - if (!backvis && m->otype != MAT_TRANS2) { - raytrans(r); - return(1); - } - flipsurface(r); /* reorient if backvis */ - } - /* get modifiers */ - raytexture(r, m->omod); + nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ if (nd.pdot < .001) nd.pdot = .001; /* non-zero for diraniso() */ @@ -286,11 +236,9 @@ register RAY *r; if (specthresh >= nd.rspec-FTINY) nd.specfl |= SP_RBLT; /* compute refl. direction */ - for (i = 0; i < 3; i++) - nd.vrefl[i] = r->rdir[i] + 2.0*nd.pdot*nd.pnorm[i]; + VSUM(nd.vrefl, r->rdir, nd.pnorm, 2.0*nd.pdot); if (DOT(nd.vrefl, r->ron) <= FTINY) /* penetration? */ - for (i = 0; i < 3; i++) /* safety measure */ - nd.vrefl[i] = r->rdir[i] + 2.*r->rod*r->ron[i]; + VSUM(nd.vrefl, r->rdir, r->ron, 2.0*r->rod); } /* compute transmission */ if (m->otype == MAT_TRANS2) { @@ -328,12 +276,11 @@ register RAY *r; agaussamp(r, &nd); if (nd.rdiff > FTINY) { /* ambient from this side */ - ambient(ctmp, r, nd.pnorm); - if (nd.specfl & SP_RBLT) - scalecolor(ctmp, 1.0-nd.trans); - else - scalecolor(ctmp, nd.rdiff); - multcolor(ctmp, nd.mcolor); /* modified by material color */ + copycolor(ctmp, nd.mcolor); /* modified by material color */ + scalecolor(ctmp, nd.rdiff); + if (nd.specfl & SP_RBLT) /* add in specular as well? */ + addcolor(ctmp, nd.scolor); + multambient(ctmp, r, nd.pnorm); addcolor(r->rcol, ctmp); /* add to returned color */ } if (nd.tdiff > FTINY) { /* ambient from other side */ @@ -343,12 +290,12 @@ register RAY *r; bnorm[0] = -nd.pnorm[0]; bnorm[1] = -nd.pnorm[1]; bnorm[2] = -nd.pnorm[2]; - ambient(ctmp, r, bnorm); + copycolor(ctmp, nd.mcolor); /* modified by color */ if (nd.specfl & SP_TBLT) scalecolor(ctmp, nd.trans); else scalecolor(ctmp, nd.tdiff); - multcolor(ctmp, nd.mcolor); /* modified by color */ + multambient(ctmp, r, bnorm); addcolor(r->rcol, ctmp); flipsurface(r); } @@ -360,9 +307,10 @@ register RAY *r; static void -getacoords(r, np) /* set up coordinate system */ -RAY *r; -register ANISODAT *np; +getacoords( /* set up coordinate system */ + RAY *r, + register ANISODAT *np +) { register MFUNC *mf; register int i; @@ -372,7 +320,7 @@ register ANISODAT *np; errno = 0; for (i = 0; i < 3; i++) np->u[i] = evalue(mf->ep[i]); - if (errno) { + if (errno == EDOM || errno == ERANGE) { objerror(np->mp, WARNING, "compute error"); np->specfl |= SP_BADU; return; @@ -390,22 +338,39 @@ register ANISODAT *np; static void -agaussamp(r, np) /* sample anisotropic gaussian specular */ -RAY *r; -register ANISODAT *np; +agaussamp( /* sample anisotropic Gaussian specular */ + RAY *r, + register ANISODAT *np +) { RAY sr; FVECT h; double rv[2]; double d, sinp, cosp; - int niter; + COLOR scol; + int maxiter, ntrials, nstarget, nstaken; register int i; /* compute reflection */ if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL && - rayorigin(&sr, r, SPECULAR, np->rspec) == 0) { - dimlist[ndims++] = (int)np->mp; - for (niter = 0; niter < MAXITER; niter++) { - if (niter) + rayorigin(&sr, SPECULAR, r, np->scolor) == 0) { + nstarget = 1; + if (specjitter > 1.5) { /* multiple samples? */ + nstarget = specjitter*r->rweight + .5; + if (sr.rweight <= minweight*nstarget) + nstarget = sr.rweight/minweight; + if (nstarget > 1) { + d = 1./nstarget; + scalecolor(sr.rcoef, d); + sr.rweight *= d; + } else + nstarget = 1; + } + setcolor(scol, 0., 0., 0.); + dimlist[ndims++] = (int)(size_t)np->mp; + maxiter = MAXITER*nstarget; + for (nstaken = ntrials = 0; nstaken < nstarget && + ntrials < maxiter; ntrials++) { + if (ntrials) d = frandom(); else d = urand(ilhash(dimlist,ndims)+samplendx); @@ -413,10 +378,11 @@ register ANISODAT *np; d = 2.0*PI * rv[0]; cosp = tcos(d) * np->u_alpha; sinp = tsin(d) * np->v_alpha; - d = sqrt(cosp*cosp + sinp*sinp); - cosp /= d; - sinp /= d; - rv[1] = 1.0 - specjitter*rv[1]; + d = 1./sqrt(cosp*cosp + sinp*sinp); + cosp *= d; + sinp *= d; + if ((0. <= specjitter) & (specjitter < 1.)) + rv[1] = 1.0 - specjitter*rv[1]; if (rv[1] <= FTINY) d = 1.0; else @@ -427,23 +393,54 @@ register ANISODAT *np; h[i] = np->pnorm[i] + d*(cosp*np->u[i] + sinp*np->v[i]); d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); - for (i = 0; i < 3; i++) - sr.rdir[i] = r->rdir[i] + d*h[i]; - if (DOT(sr.rdir, r->ron) > FTINY) { + VSUM(sr.rdir, r->rdir, h, d); + /* sample rejection test */ + if ((d = DOT(sr.rdir, r->ron)) <= FTINY) + continue; + checknorm(sr.rdir); + if (nstarget > 1) { /* W-G-M-D adjustment */ + if (nstaken) rayclear(&sr); rayvalue(&sr); - multcolor(sr.rcol, np->scolor); + d = 2./(1. + r->rod/d); + scalecolor(sr.rcol, d); + addcolor(scol, sr.rcol); + } else { + rayvalue(&sr); + multcolor(sr.rcol, sr.rcoef); addcolor(r->rcol, sr.rcol); - break; } + ++nstaken; } + if (nstarget > 1) { /* final W-G-M-D weighting */ + multcolor(scol, sr.rcoef); + d = (double)nstarget/ntrials; + scalecolor(scol, d); + addcolor(r->rcol, scol); + } ndims--; } /* compute transmission */ + copycolor(sr.rcoef, np->mcolor); /* modify by material color */ + scalecolor(sr.rcoef, np->tspec); if ((np->specfl & (SP_TRAN|SP_TBLT)) == SP_TRAN && - rayorigin(&sr, r, SPECULAR, np->tspec) == 0) { - dimlist[ndims++] = (int)np->mp; - for (niter = 0; niter < MAXITER; niter++) { - if (niter) + rayorigin(&sr, SPECULAR, r, sr.rcoef) == 0) { + nstarget = 1; + if (specjitter > 1.5) { /* multiple samples? */ + nstarget = specjitter*r->rweight + .5; + if (sr.rweight <= minweight*nstarget) + nstarget = sr.rweight/minweight; + if (nstarget > 1) { + d = 1./nstarget; + scalecolor(sr.rcoef, d); + sr.rweight *= d; + } else + nstarget = 1; + } + dimlist[ndims++] = (int)(size_t)np->mp; + maxiter = MAXITER*nstarget; + for (nstaken = ntrials = 0; nstaken < nstarget && + ntrials < maxiter; ntrials++) { + if (ntrials) d = frandom(); else d = urand(ilhash(dimlist,ndims)+1823+samplendx); @@ -451,10 +448,11 @@ register ANISODAT *np; d = 2.0*PI * rv[0]; cosp = tcos(d) * np->u_alpha; sinp = tsin(d) * np->v_alpha; - d = sqrt(cosp*cosp + sinp*sinp); - cosp /= d; - sinp /= d; - rv[1] = 1.0 - specjitter*rv[1]; + d = 1./sqrt(cosp*cosp + sinp*sinp); + cosp *= d; + sinp *= d; + if ((0. <= specjitter) & (specjitter < 1.)) + rv[1] = 1.0 - specjitter*rv[1]; if (rv[1] <= FTINY) d = 1.0; else @@ -464,14 +462,15 @@ register ANISODAT *np; for (i = 0; i < 3; i++) sr.rdir[i] = np->prdir[i] + d*(cosp*np->u[i] + sinp*np->v[i]); - if (DOT(sr.rdir, r->ron) < -FTINY) { - normalize(sr.rdir); /* OK, normalize */ - rayvalue(&sr); - scalecolor(sr.rcol, np->tspec); - multcolor(sr.rcol, np->mcolor); /* modify */ - addcolor(r->rcol, sr.rcol); - break; - } + if (DOT(sr.rdir, r->ron) >= -FTINY) + continue; + normalize(sr.rdir); /* OK, normalize */ + if (nstaken) /* multi-sampling */ + rayclear(&sr); + rayvalue(&sr); + multcolor(sr.rcol, sr.rcoef); + addcolor(r->rcol, sr.rcol); + ++nstaken; } ndims--; }