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/* Copyright (c) 1991 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Shading for materials with arbitrary BRDF's |
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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 "ray.h" |
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#include "data.h" |
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#include "func.h" |
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extern int backvis; /* back faces visible? */ |
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/* |
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* Arguments to this material include the color and specularity. |
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* String arguments include the reflection function and files. |
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} BRDFDAT; /* BRDF material data */ |
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static void |
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dirbrdf(cval, np, ldir, omega) /* compute source contribution */ |
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COLOR cval; /* returned coefficient */ |
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register BRDFDAT *np; /* material data */ |
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} |
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m_brdf(m, r) /* color a ray which hit a BRDTfunc material */ |
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int |
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m_brdf(m, r) /* color a ray that hit a BRDTfunc material */ |
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register OBJREC *m; |
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register RAY *r; |
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{ |
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int hitfront = 1; |
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BRDFDAT nd; |
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RAY sr; |
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double transtest, transdist; |
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nd.pnorm[i] = -nd.pnorm[i]; |
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r->pert[i] = -r->pert[i]; |
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} |
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hitfront = 0; |
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} |
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copycolor(nd.mcolor, r->pcol); /* get pattern color */ |
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multcolor(nd.rdiff, nd.mcolor); /* modify diffuse values */ |
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} |
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/* compute ambient */ |
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if (hasrefl) { |
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if (nd.pdot < 0.0) { |
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if (!hitfront) |
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flipsurface(r); |
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vtmp[0] = -nd.pnorm[0]; |
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vtmp[1] = -nd.pnorm[1]; |
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vtmp[2] = -nd.pnorm[2]; |
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} else |
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VCOPY(vtmp, nd.pnorm); |
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ambient(ctmp, r, vtmp); |
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ambient(ctmp, r, nd.pnorm); |
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multcolor(ctmp, nd.rdiff); |
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addcolor(r->rcol, ctmp); /* add to returned color */ |
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if (nd.pdot < 0.0) |
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if (!hitfront) |
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flipsurface(r); |
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} |
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if (hastrans) { /* from other side */ |
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if (nd.pdot > 0.0) { |
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if (hitfront) |
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flipsurface(r); |
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vtmp[0] = -nd.pnorm[0]; |
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vtmp[1] = -nd.pnorm[1]; |
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vtmp[2] = -nd.pnorm[2]; |
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} else |
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VCOPY(vtmp, nd.pnorm); |
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vtmp[0] = -nd.pnorm[0]; |
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vtmp[1] = -nd.pnorm[1]; |
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vtmp[2] = -nd.pnorm[2]; |
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ambient(ctmp, r, vtmp); |
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multcolor(ctmp, nd.tdiff); |
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addcolor(r->rcol, ctmp); |
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if (nd.pdot > 0.0) |
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if (hitfront) |
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flipsurface(r); |
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} |
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if (hasrefl | hastrans || m->oargs.sarg[6][0] != '0') |
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m_brdf2(m, r) /* color a ray which hit a BRDF material */ |
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int |
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m_brdf2(m, r) /* color a ray that hit a BRDF material */ |
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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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int |
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setbrdfunc(np) /* set up brdf function and variables */ |
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register BRDFDAT *np; |
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{ |