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* dielectric.c - shading function for transparent materials. |
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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 "otypes.h" |
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#include "rtotypes.h" |
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|
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#ifdef DISPERSE |
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#include "source.h" |
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static disperse(); |
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static int lambda(); |
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static int disperse(OBJREC *m,RAY *r,FVECT vt,double tr,COLOR cet,COLOR abt); |
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static int lambda(OBJREC *m, FVECT v2, FVECT dv, FVECT lr); |
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#endif |
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|
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static double mylog(double x); |
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|
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|
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/* |
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* Explicit calculations for Fresnel's equation are performed, |
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* but only one square root computation is necessary. |
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|
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|
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static double |
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mylog(x) /* special log for extinction coefficients */ |
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double x; |
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mylog( /* special log for extinction coefficients */ |
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double x |
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) |
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{ |
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if (x < 1e-40) |
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return(-100.); |
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} |
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|
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m_dielectric(m, r) /* color a ray which hit a dielectric interface */ |
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OBJREC *m; |
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register RAY *r; |
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extern int |
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m_dielectric( /* color a ray which hit a dielectric interface */ |
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OBJREC *m, |
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register RAY *r |
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) |
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{ |
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double cos1, cos2, nratio; |
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COLOR ctrans; |
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|
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raytexture(r, m->omod); /* get modifiers */ |
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|
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if (hastexture = DOT(r->pert,r->pert) > FTINY*FTINY) |
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if ( (hastexture = DOT(r->pert,r->pert) > FTINY*FTINY) ) |
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cos1 = raynormal(dnorm, r); /* perturb normal */ |
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else { |
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VCOPY(dnorm, r->ron); |
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|
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|
#ifdef DISPERSE |
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|
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static |
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disperse(m, r, vt, tr, cet, abt) /* check light sources for dispersion */ |
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OBJREC *m; |
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RAY *r; |
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FVECT vt; |
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double tr; |
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COLOR cet, abt; |
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static int |
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disperse( /* check light sources for dispersion */ |
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OBJREC *m, |
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RAY *r, |
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> |
FVECT vt, |
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> |
double tr, |
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> |
COLOR cet, |
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COLOR abt |
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> |
) |
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|
{ |
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|
RAY sray, *entray; |
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FVECT v1, v2, n1, n2; |
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|
|
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|
|
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|
static int |
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lambda(m, v2, dv, lr) /* compute lambda for material */ |
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register OBJREC *m; |
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FVECT v2, dv, lr; |
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lambda( /* compute lambda for material */ |
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register OBJREC *m, |
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FVECT v2, |
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FVECT dv, |
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FVECT lr |
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> |
) |
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|
{ |
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|
FVECT lrXdv, v2Xlr; |
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|
double dtmp, denom; |