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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* normal.c - shading function for normal materials. |
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* Later changes described in delta comments. |
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*/ |
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|
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/* ==================================================================== |
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* The Radiance Software License, Version 1.0 |
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* |
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* Copyright (c) 1990 - 2002 The Regents of the University of California, |
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* through Lawrence Berkeley National Laboratory. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, |
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* if any, must include the following acknowledgment: |
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* "This product includes Radiance software |
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* (http://radsite.lbl.gov/) |
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* developed by the Lawrence Berkeley National Laboratory |
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* (http://www.lbl.gov/)." |
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* Alternately, this acknowledgment may appear in the software itself, |
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* if and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
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* and "The Regents of the University of California" must |
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* not be used to endorse or promote products derived from this |
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* software without prior written permission. For written |
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* permission, please contact [email protected]. |
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* |
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* 5. Products derived from this software may not be called "Radiance", |
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* nor may "Radiance" appear in their name, without prior written |
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* permission of Lawrence Berkeley National Laboratory. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This software consists of voluntary contributions made by many |
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
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* information on Lawrence Berkeley National Laboratory, please see |
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* <http://www.lbl.gov/>. |
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*/ |
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#include "copyright.h" |
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|
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#include "ray.h" |
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|
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#include "ambient.h" |
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#include "source.h" |
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#include "otypes.h" |
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|
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#include "rtotypes.h" |
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#include "random.h" |
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|
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#ifndef MAXITER |
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#define MAXITER 10 /* maximum # specular ray attempts */ |
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#endif |
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/* estimate of Fresnel function */ |
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#define FRESNE(ci) (exp(-6.0*(ci)) - 0.00247875217) |
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#define FRESNE(ci) (exp(-5.85*(ci)) - 0.00287989916) |
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|
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static void gaussamp(); |
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|
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/* |
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* This routine implements the isotropic Gaussian |
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double pdot; /* perturbed dot product */ |
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} NORMDAT; /* normal material data */ |
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|
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static srcdirf_t dirnorm; |
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static void gaussamp(RAY *r, NORMDAT *np); |
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|
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|
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static void |
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dirnorm(cval, np, ldir, omega) /* compute source contribution */ |
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COLOR cval; /* returned coefficient */ |
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register NORMDAT *np; /* material data */ |
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FVECT ldir; /* light source direction */ |
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double omega; /* light source size */ |
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dirnorm( /* compute source contribution */ |
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COLOR cval, /* returned coefficient */ |
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void *nnp, /* material data */ |
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FVECT ldir, /* light source direction */ |
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double omega /* light source size */ |
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) |
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{ |
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register NORMDAT *np = nnp; |
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double ldot; |
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double ldiff; |
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double lrdiff, ltdiff; |
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double dtmp, d2; |
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FVECT vtmp; |
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COLOR ctmp; |
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return; /* wrong side */ |
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|
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/* Fresnel estimate */ |
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ldiff = np->rdiff; |
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if (np->specfl & SP_PURE && (np->rspec > FTINY & ldiff > FTINY)) |
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ldiff *= 1. - FRESNE(fabs(ldot)); |
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lrdiff = np->rdiff; |
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ltdiff = np->tdiff; |
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if (np->specfl & SP_PURE && np->rspec > FTINY && |
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(lrdiff > FTINY) | (ltdiff > FTINY)) { |
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dtmp = 1. - FRESNE(fabs(ldot)); |
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lrdiff *= dtmp; |
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ltdiff *= dtmp; |
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} |
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|
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if (ldot > FTINY && ldiff > FTINY) { |
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if (ldot > FTINY && lrdiff > FTINY) { |
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/* |
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* Compute and add diffuse reflected component to returned |
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* color. The diffuse reflected component will always be |
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* modified by the color of the material. |
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*/ |
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copycolor(ctmp, np->mcolor); |
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dtmp = ldot * omega * ldiff / PI; |
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dtmp = ldot * omega * lrdiff * (1.0/PI); |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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} |
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dtmp = np->alpha2; |
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/* + source if flat */ |
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if (np->specfl & SP_FLAT) |
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dtmp += omega/(4.0*PI); |
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dtmp += omega * (0.25/PI); |
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/* half vector */ |
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vtmp[0] = ldir[0] - np->rp->rdir[0]; |
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vtmp[1] = ldir[1] - np->rp->rdir[1]; |
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d2 *= d2; |
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d2 = (DOT(vtmp,vtmp) - d2) / d2; |
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/* gaussian */ |
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dtmp = exp(-d2/dtmp)/(4.*PI*dtmp); |
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dtmp = exp(-d2/dtmp)/(4.*PI * np->pdot * dtmp); |
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/* worth using? */ |
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if (dtmp > FTINY) { |
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copycolor(ctmp, np->scolor); |
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dtmp *= omega * sqrt(ldot/np->pdot); |
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dtmp *= omega; |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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} |
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} |
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if (ldot < -FTINY && np->tdiff > FTINY) { |
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if (ldot < -FTINY && ltdiff > FTINY) { |
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/* |
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* Compute diffuse transmission. |
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*/ |
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copycolor(ctmp, np->mcolor); |
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dtmp = -ldot * omega * np->tdiff / PI; |
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dtmp = -ldot * omega * ltdiff * (1.0/PI); |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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} |
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* is always modified by material color. |
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*/ |
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/* roughness + source */ |
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dtmp = np->alpha2 + omega/PI; |
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dtmp = np->alpha2 + omega*(1.0/PI); |
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/* gaussian */ |
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dtmp = exp((2.*DOT(np->prdir,ldir)-2.)/dtmp)/(PI*dtmp); |
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dtmp = exp((2.*DOT(np->prdir,ldir)-2.)/dtmp) / |
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(PI*np->pdot*dtmp); |
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/* worth using? */ |
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if (dtmp > FTINY) { |
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copycolor(ctmp, np->mcolor); |
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dtmp *= np->tspec * omega * sqrt(-ldot/np->pdot); |
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dtmp *= np->tspec * omega; |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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} |
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} |
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|
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int |
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m_normal(m, r) /* color a ray that hit something normal */ |
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register OBJREC *m; |
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register RAY *r; |
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extern int |
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m_normal( /* color a ray that hit something normal */ |
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register OBJREC *m, |
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register RAY *r |
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) |
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{ |
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NORMDAT nd; |
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double fest; |
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raytrans(r); |
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return(1); |
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} |
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raytexture(r, m->omod); |
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flipsurface(r); /* reorient if backvis */ |
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} |
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} else |
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raytexture(r, m->omod); |
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nd.mp = m; |
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nd.rp = r; |
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/* get material color */ |
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nd.alpha2 = m->oargs.farg[4]; |
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if ((nd.alpha2 *= nd.alpha2) <= FTINY) |
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nd.specfl |= SP_PURE; |
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if (r->ro != NULL && isflat(r->ro->otype)) |
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nd.specfl |= SP_FLAT; |
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/* get modifiers */ |
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raytexture(r, m->omod); |
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if (hastexture = DOT(r->pert,r->pert) > FTINY*FTINY) |
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|
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if ( (hastexture = (DOT(r->pert,r->pert) > FTINY*FTINY)) ) { |
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nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
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else { |
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} else { |
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VCOPY(nd.pnorm, r->ron); |
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nd.pdot = r->rod; |
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} |
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if (r->ro != NULL && isflat(r->ro->otype)) |
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nd.specfl |= SP_FLAT; |
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if (nd.pdot < .001) |
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nd.pdot = .001; /* non-zero for dirnorm() */ |
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multcolor(nd.mcolor, r->pcol); /* modify material color */ |
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/* transmitted ray */ |
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if ((nd.specfl&(SP_TRAN|SP_PURE|SP_TBLT)) == (SP_TRAN|SP_PURE)) { |
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RAY lr; |
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if (rayorigin(&lr, r, TRANS, nd.tspec) == 0) { |
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copycolor(lr.rcoef, nd.mcolor); /* modified by color */ |
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scalecolor(lr.rcoef, nd.tspec); |
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if (rayorigin(&lr, TRANS, r, lr.rcoef) == 0) { |
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VCOPY(lr.rdir, nd.prdir); |
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rayvalue(&lr); |
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scalecolor(lr.rcol, nd.tspec); |
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multcolor(lr.rcol, nd.mcolor); /* modified by color */ |
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multcolor(lr.rcol, lr.rcoef); |
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addcolor(r->rcol, lr.rcol); |
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transtest *= bright(lr.rcol); |
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transdist = r->rot + lr.rt; |
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/* reflected ray */ |
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if ((nd.specfl&(SP_REFL|SP_PURE|SP_RBLT)) == (SP_REFL|SP_PURE)) { |
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RAY lr; |
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if (rayorigin(&lr, r, REFLECTED, nd.rspec) == 0) { |
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> |
if (rayorigin(&lr, REFLECTED, r, nd.scolor) == 0) { |
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VCOPY(lr.rdir, nd.vrefl); |
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rayvalue(&lr); |
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multcolor(lr.rcol, nd.scolor); |
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> |
multcolor(lr.rcol, lr.rcoef); |
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addcolor(r->rcol, lr.rcol); |
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if (!hastexture && nd.specfl & SP_FLAT) { |
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mirtest = 2.*bright(lr.rcol); |
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gaussamp(r, &nd); /* checks *BLT flags */ |
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|
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if (nd.rdiff > FTINY) { /* ambient from this side */ |
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ambient(ctmp, r, hastexture?nd.pnorm:r->ron); |
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> |
copycolor(ctmp, nd.mcolor); /* modified by material color */ |
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if (nd.specfl & SP_RBLT) |
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scalecolor(ctmp, 1.0-nd.trans); |
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else |
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scalecolor(ctmp, nd.rdiff); |
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multcolor(ctmp, nd.mcolor); /* modified by material color */ |
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multambient(ctmp, r, hastexture ? nd.pnorm : r->ron); |
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addcolor(r->rcol, ctmp); /* add to returned color */ |
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} |
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if (nd.tdiff > FTINY) { /* ambient from other side */ |
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copycolor(ctmp, nd.mcolor); /* modified by color */ |
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if (nd.specfl & SP_TBLT) |
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scalecolor(ctmp, nd.trans); |
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else |
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scalecolor(ctmp, nd.tdiff); |
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flipsurface(r); |
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if (hastexture) { |
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FVECT bnorm; |
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bnorm[0] = -nd.pnorm[0]; |
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bnorm[1] = -nd.pnorm[1]; |
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bnorm[2] = -nd.pnorm[2]; |
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< |
ambient(ctmp, r, bnorm); |
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> |
multambient(ctmp, r, bnorm); |
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} else |
349 |
< |
ambient(ctmp, r, r->ron); |
386 |
< |
if (nd.specfl & SP_TBLT) |
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< |
scalecolor(ctmp, nd.trans); |
388 |
< |
else |
389 |
< |
scalecolor(ctmp, nd.tdiff); |
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< |
multcolor(ctmp, nd.mcolor); /* modified by color */ |
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> |
multambient(ctmp, r, r->ron); |
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addcolor(r->rcol, ctmp); |
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flipsurface(r); |
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} |
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|
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|
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static void |
367 |
< |
gaussamp(r, np) /* sample gaussian specular */ |
368 |
< |
RAY *r; |
369 |
< |
register NORMDAT *np; |
367 |
> |
gaussamp( /* sample gaussian specular */ |
368 |
> |
RAY *r, |
369 |
> |
register NORMDAT *np |
370 |
> |
) |
371 |
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{ |
372 |
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RAY sr; |
373 |
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FVECT u, v, h; |
390 |
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fcross(v, np->pnorm, u); |
391 |
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/* compute reflection */ |
392 |
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if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL && |
393 |
< |
rayorigin(&sr, r, SPECULAR, np->rspec) == 0) { |
393 |
> |
rayorigin(&sr, SPECULAR, r, np->scolor) == 0) { |
394 |
|
dimlist[ndims++] = (int)np->mp; |
395 |
|
for (niter = 0; niter < MAXITER; niter++) { |
396 |
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if (niter) |
413 |
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sr.rdir[i] = r->rdir[i] + d*h[i]; |
414 |
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if (DOT(sr.rdir, r->ron) > FTINY) { |
415 |
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rayvalue(&sr); |
416 |
< |
multcolor(sr.rcol, np->scolor); |
416 |
> |
multcolor(sr.rcol, sr.rcoef); |
417 |
|
addcolor(r->rcol, sr.rcol); |
418 |
|
break; |
419 |
|
} |
421 |
|
ndims--; |
422 |
|
} |
423 |
|
/* compute transmission */ |
424 |
+ |
copycolor(sr.rcoef, np->mcolor); /* modified by color */ |
425 |
+ |
scalecolor(sr.rcoef, np->tspec); |
426 |
|
if ((np->specfl & (SP_TRAN|SP_TBLT)) == SP_TRAN && |
427 |
< |
rayorigin(&sr, r, SPECULAR, np->tspec) == 0) { |
427 |
> |
rayorigin(&sr, SPECULAR, r, sr.rcoef) == 0) { |
428 |
|
dimlist[ndims++] = (int)np->mp; |
429 |
|
for (niter = 0; niter < MAXITER; niter++) { |
430 |
|
if (niter) |
445 |
|
if (DOT(sr.rdir, r->ron) < -FTINY) { |
446 |
|
normalize(sr.rdir); /* OK, normalize */ |
447 |
|
rayvalue(&sr); |
448 |
< |
scalecolor(sr.rcol, np->tspec); |
487 |
< |
multcolor(sr.rcol, np->mcolor); /* modified */ |
448 |
> |
multcolor(sr.rcol, sr.rcoef); |
449 |
|
addcolor(r->rcol, sr.rcol); |
450 |
|
break; |
451 |
|
} |