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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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* Shading functions for anisotropic 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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#include "ambient.h" |
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#include "otypes.h" |
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|
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#include "rtotypes.h" |
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#include "source.h" |
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#include "func.h" |
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#include "random.h" |
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|
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#ifndef MAXITER |
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double pdot; /* perturbed dot product */ |
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} ANISODAT; /* anisotropic material data */ |
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|
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static void getacoords(); |
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static void agaussamp(); |
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static srcdirf_t diraniso; |
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static void getacoords(RAY *r, ANISODAT *np); |
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static void agaussamp(RAY *r, ANISODAT *np); |
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|
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|
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static void |
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diraniso(cval, np, ldir, omega) /* compute source contribution */ |
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COLOR cval; /* returned coefficient */ |
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register ANISODAT *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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diraniso( /* 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 ANISODAT *np = nnp; |
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double ldot; |
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double dtmp, dtmp1, dtmp2; |
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FVECT h; |
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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 * np->rdiff / PI; |
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dtmp = ldot * omega * np->rdiff * (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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if (ldot > FTINY && (np->specfl&(SP_REFL|SP_BADU)) == SP_REFL) { |
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/* |
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* Compute specular reflection coefficient using |
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* anisotropic gaussian distribution model. |
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* anisotropic Gaussian distribution model. |
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*/ |
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/* add source width if flat */ |
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if (np->specfl & SP_FLAT) |
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au2 = av2 = omega/(4.0*PI); |
108 |
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au2 = av2 = omega * (0.25/PI); |
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else |
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au2 = av2 = 0.0; |
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au2 += np->u_alpha*np->u_alpha; |
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dtmp1 *= dtmp1 / au2; |
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dtmp2 = DOT(np->v, h); |
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dtmp2 *= dtmp2 / av2; |
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/* gaussian */ |
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/* new W-G-M-D model */ |
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dtmp = DOT(np->pnorm, h); |
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dtmp = (dtmp1 + dtmp2) / (dtmp*dtmp); |
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dtmp = exp(-dtmp) * (0.25/PI) |
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* sqrt(ldot/(np->pdot*au2*av2)); |
124 |
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dtmp *= dtmp; |
125 |
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dtmp1 = (dtmp1 + dtmp2) / dtmp; |
126 |
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dtmp = exp(-dtmp1) * DOT(h,h) / |
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(PI * dtmp*dtmp * sqrt(au2*av2)); |
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/* worth using? */ |
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if (dtmp > FTINY) { |
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copycolor(ctmp, np->scolor); |
131 |
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dtmp *= omega; |
131 |
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dtmp *= ldot * omega; |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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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 * np->tdiff * (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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au2 = av2 = omega / PI; |
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au2 = av2 = omega * (1.0/PI); |
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au2 += np->u_alpha*np->u_alpha; |
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av2 += np->v_alpha*np->v_alpha; |
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/* "half vector" */ |
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} |
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} else |
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dtmp = 0.0; |
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/* gaussian */ |
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dtmp = exp(-dtmp) * (1.0/PI) |
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* sqrt(-ldot/(np->pdot*au2*av2)); |
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/* Gaussian */ |
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dtmp = exp(-dtmp) * (1.0/PI) * sqrt(-ldot/(np->pdot*au2*av2)); |
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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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} |
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|
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|
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int |
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m_aniso(m, r) /* shade ray that hit something anisotropic */ |
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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_aniso( /* shade ray that hit something anisotropic */ |
186 |
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register OBJREC *m, |
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register RAY *r |
188 |
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) |
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{ |
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ANISODAT nd; |
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COLOR ctmp; |
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|
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if (m->oargs.nfargs != (m->otype == MAT_TRANS2 ? 8 : 6)) |
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objerror(m, USER, "bad number of real arguments"); |
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/* check for back side */ |
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if (r->rod < 0.0) { |
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if (!backvis && m->otype != MAT_TRANS2) { |
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raytrans(r); |
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return(1); |
204 |
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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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} else |
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raytexture(r, m->omod); |
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/* get material color */ |
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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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setcolor(nd.mcolor, m->oargs.farg[0], |
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m->oargs.farg[1], |
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m->oargs.farg[2]); |
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nd.specfl = 0; |
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nd.u_alpha = m->oargs.farg[4]; |
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nd.v_alpha = m->oargs.farg[5]; |
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if (nd.u_alpha < FTINY || nd.v_alpha <= FTINY) |
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if (nd.u_alpha <= FTINY || nd.v_alpha <= FTINY) |
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objerror(m, USER, "roughness too small"); |
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/* check for back side */ |
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if (r->rod < 0.0) { |
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if (!backvis && m->otype != MAT_TRANS2) { |
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raytrans(r); |
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return(1); |
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} |
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flipsurface(r); /* reorient if backvis */ |
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} |
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/* get modifiers */ |
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raytexture(r, m->omod); |
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|
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nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
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if (nd.pdot < .001) |
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nd.pdot = .001; /* non-zero for diraniso() */ |
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if (specthresh >= nd.rspec-FTINY) |
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nd.specfl |= SP_RBLT; |
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/* compute refl. direction */ |
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for (i = 0; i < 3; i++) |
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nd.vrefl[i] = r->rdir[i] + 2.0*nd.pdot*nd.pnorm[i]; |
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VSUM(nd.vrefl, r->rdir, nd.pnorm, 2.0*nd.pdot); |
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if (DOT(nd.vrefl, r->ron) <= FTINY) /* penetration? */ |
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< |
for (i = 0; i < 3; i++) /* safety measure */ |
293 |
< |
nd.vrefl[i] = r->rdir[i] + 2.*r->rod*r->ron[i]; |
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> |
VSUM(nd.vrefl, r->rdir, r->ron, 2.0*r->rod); |
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} |
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/* compute transmission */ |
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if (m->otype == MAT_TRANS2) { |
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agaussamp(r, &nd); |
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|
278 |
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if (nd.rdiff > FTINY) { /* ambient from this side */ |
279 |
< |
ambient(ctmp, r, nd.pnorm); |
279 |
> |
copycolor(ctmp, nd.mcolor); /* modified by material color */ |
280 |
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if (nd.specfl & SP_RBLT) |
281 |
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scalecolor(ctmp, 1.0-nd.trans); |
282 |
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else |
283 |
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scalecolor(ctmp, nd.rdiff); |
284 |
< |
multcolor(ctmp, nd.mcolor); /* modified by material color */ |
284 |
> |
multambient(ctmp, r, nd.pnorm); |
285 |
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addcolor(r->rcol, ctmp); /* add to returned color */ |
286 |
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} |
287 |
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if (nd.tdiff > FTINY) { /* ambient from other side */ |
291 |
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bnorm[0] = -nd.pnorm[0]; |
292 |
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bnorm[1] = -nd.pnorm[1]; |
293 |
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bnorm[2] = -nd.pnorm[2]; |
294 |
< |
ambient(ctmp, r, bnorm); |
294 |
> |
copycolor(ctmp, nd.mcolor); /* modified by color */ |
295 |
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if (nd.specfl & SP_TBLT) |
296 |
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scalecolor(ctmp, nd.trans); |
297 |
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else |
298 |
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scalecolor(ctmp, nd.tdiff); |
299 |
< |
multcolor(ctmp, nd.mcolor); /* modified by color */ |
299 |
> |
multambient(ctmp, r, bnorm); |
300 |
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addcolor(r->rcol, ctmp); |
301 |
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flipsurface(r); |
302 |
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} |
308 |
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|
309 |
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|
310 |
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static void |
311 |
< |
getacoords(r, np) /* set up coordinate system */ |
312 |
< |
RAY *r; |
313 |
< |
register ANISODAT *np; |
311 |
> |
getacoords( /* set up coordinate system */ |
312 |
> |
RAY *r, |
313 |
> |
register ANISODAT *np |
314 |
> |
) |
315 |
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{ |
316 |
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register MFUNC *mf; |
317 |
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register int i; |
321 |
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errno = 0; |
322 |
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for (i = 0; i < 3; i++) |
323 |
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np->u[i] = evalue(mf->ep[i]); |
324 |
< |
if (errno) { |
324 |
> |
if (errno == EDOM || errno == ERANGE) { |
325 |
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objerror(np->mp, WARNING, "compute error"); |
326 |
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np->specfl |= SP_BADU; |
327 |
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return; |
339 |
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|
340 |
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|
341 |
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static void |
342 |
< |
agaussamp(r, np) /* sample anisotropic gaussian specular */ |
343 |
< |
RAY *r; |
344 |
< |
register ANISODAT *np; |
342 |
> |
agaussamp( /* sample anisotropic Gaussian specular */ |
343 |
> |
RAY *r, |
344 |
> |
register ANISODAT *np |
345 |
> |
) |
346 |
|
{ |
347 |
|
RAY sr; |
348 |
|
FVECT h; |
349 |
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double rv[2]; |
350 |
|
double d, sinp, cosp; |
351 |
< |
int niter; |
351 |
> |
COLOR scol; |
352 |
> |
int maxiter, ntrials, nstarget, nstaken; |
353 |
|
register int i; |
354 |
|
/* compute reflection */ |
355 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL && |
356 |
< |
rayorigin(&sr, r, SPECULAR, np->rspec) == 0) { |
356 |
> |
rayorigin(&sr, SPECULAR, r, np->scolor) == 0) { |
357 |
> |
nstarget = 1; |
358 |
> |
if (specjitter > 1.5) { /* multiple samples? */ |
359 |
> |
nstarget = specjitter*r->rweight + .5; |
360 |
> |
if (sr.rweight <= minweight*nstarget) |
361 |
> |
nstarget = sr.rweight/minweight; |
362 |
> |
if (nstarget > 1) { |
363 |
> |
d = 1./nstarget; |
364 |
> |
scalecolor(sr.rcoef, d); |
365 |
> |
sr.rweight *= d; |
366 |
> |
} else |
367 |
> |
nstarget = 1; |
368 |
> |
} |
369 |
> |
setcolor(scol, 0., 0., 0.); |
370 |
|
dimlist[ndims++] = (int)np->mp; |
371 |
< |
for (niter = 0; niter < MAXITER; niter++) { |
372 |
< |
if (niter) |
371 |
> |
maxiter = MAXITER*nstarget; |
372 |
> |
for (nstaken = ntrials = 0; nstaken < nstarget && |
373 |
> |
ntrials < maxiter; ntrials++) { |
374 |
> |
if (ntrials) |
375 |
|
d = frandom(); |
376 |
|
else |
377 |
|
d = urand(ilhash(dimlist,ndims)+samplendx); |
379 |
|
d = 2.0*PI * rv[0]; |
380 |
|
cosp = tcos(d) * np->u_alpha; |
381 |
|
sinp = tsin(d) * np->v_alpha; |
382 |
< |
d = sqrt(cosp*cosp + sinp*sinp); |
383 |
< |
cosp /= d; |
384 |
< |
sinp /= d; |
385 |
< |
rv[1] = 1.0 - specjitter*rv[1]; |
382 |
> |
d = 1./sqrt(cosp*cosp + sinp*sinp); |
383 |
> |
cosp *= d; |
384 |
> |
sinp *= d; |
385 |
> |
if ((0. <= specjitter) & (specjitter < 1.)) |
386 |
> |
rv[1] = 1.0 - specjitter*rv[1]; |
387 |
|
if (rv[1] <= FTINY) |
388 |
|
d = 1.0; |
389 |
|
else |
394 |
|
h[i] = np->pnorm[i] + |
395 |
|
d*(cosp*np->u[i] + sinp*np->v[i]); |
396 |
|
d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); |
397 |
< |
for (i = 0; i < 3; i++) |
398 |
< |
sr.rdir[i] = r->rdir[i] + d*h[i]; |
399 |
< |
if (DOT(sr.rdir, r->ron) > FTINY) { |
397 |
> |
VSUM(sr.rdir, r->rdir, h, d); |
398 |
> |
/* sample rejection test */ |
399 |
> |
if ((d = DOT(sr.rdir, r->ron)) <= FTINY) |
400 |
> |
continue; |
401 |
> |
checknorm(sr.rdir); |
402 |
> |
if (nstarget > 1) { /* W-G-M-D adjustment */ |
403 |
> |
if (nstaken) rayclear(&sr); |
404 |
|
rayvalue(&sr); |
405 |
< |
multcolor(sr.rcol, np->scolor); |
405 |
> |
d = 2./(1. + r->rod/d); |
406 |
> |
scalecolor(sr.rcol, d); |
407 |
> |
addcolor(scol, sr.rcol); |
408 |
> |
} else { |
409 |
> |
rayvalue(&sr); |
410 |
> |
multcolor(sr.rcol, sr.rcoef); |
411 |
|
addcolor(r->rcol, sr.rcol); |
436 |
– |
break; |
412 |
|
} |
413 |
+ |
++nstaken; |
414 |
|
} |
415 |
+ |
if (nstarget > 1) { /* final W-G-M-D weighting */ |
416 |
+ |
multcolor(scol, sr.rcoef); |
417 |
+ |
d = (double)nstarget/ntrials; |
418 |
+ |
scalecolor(scol, d); |
419 |
+ |
addcolor(r->rcol, scol); |
420 |
+ |
} |
421 |
|
ndims--; |
422 |
|
} |
423 |
|
/* compute transmission */ |
424 |
+ |
copycolor(sr.rcoef, np->mcolor); /* modify by material 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 |
> |
nstarget = 1; |
429 |
> |
if (specjitter > 1.5) { /* multiple samples? */ |
430 |
> |
nstarget = specjitter*r->rweight + .5; |
431 |
> |
if (sr.rweight <= minweight*nstarget) |
432 |
> |
nstarget = sr.rweight/minweight; |
433 |
> |
if (nstarget > 1) { |
434 |
> |
d = 1./nstarget; |
435 |
> |
scalecolor(sr.rcoef, d); |
436 |
> |
sr.rweight *= d; |
437 |
> |
} else |
438 |
> |
nstarget = 1; |
439 |
> |
} |
440 |
|
dimlist[ndims++] = (int)np->mp; |
441 |
< |
for (niter = 0; niter < MAXITER; niter++) { |
442 |
< |
if (niter) |
441 |
> |
maxiter = MAXITER*nstarget; |
442 |
> |
for (nstaken = ntrials = 0; nstaken < nstarget && |
443 |
> |
ntrials < maxiter; ntrials++) { |
444 |
> |
if (ntrials) |
445 |
|
d = frandom(); |
446 |
|
else |
447 |
|
d = urand(ilhash(dimlist,ndims)+1823+samplendx); |
449 |
|
d = 2.0*PI * rv[0]; |
450 |
|
cosp = tcos(d) * np->u_alpha; |
451 |
|
sinp = tsin(d) * np->v_alpha; |
452 |
< |
d = sqrt(cosp*cosp + sinp*sinp); |
453 |
< |
cosp /= d; |
454 |
< |
sinp /= d; |
455 |
< |
rv[1] = 1.0 - specjitter*rv[1]; |
452 |
> |
d = 1./sqrt(cosp*cosp + sinp*sinp); |
453 |
> |
cosp *= d; |
454 |
> |
sinp *= d; |
455 |
> |
if ((0. <= specjitter) & (specjitter < 1.)) |
456 |
> |
rv[1] = 1.0 - specjitter*rv[1]; |
457 |
|
if (rv[1] <= FTINY) |
458 |
|
d = 1.0; |
459 |
|
else |
463 |
|
for (i = 0; i < 3; i++) |
464 |
|
sr.rdir[i] = np->prdir[i] + |
465 |
|
d*(cosp*np->u[i] + sinp*np->v[i]); |
466 |
< |
if (DOT(sr.rdir, r->ron) < -FTINY) { |
467 |
< |
normalize(sr.rdir); /* OK, normalize */ |
468 |
< |
rayvalue(&sr); |
469 |
< |
scalecolor(sr.rcol, np->tspec); |
470 |
< |
multcolor(sr.rcol, np->mcolor); /* modify */ |
471 |
< |
addcolor(r->rcol, sr.rcol); |
472 |
< |
break; |
473 |
< |
} |
466 |
> |
if (DOT(sr.rdir, r->ron) >= -FTINY) |
467 |
> |
continue; |
468 |
> |
normalize(sr.rdir); /* OK, normalize */ |
469 |
> |
if (nstaken) /* multi-sampling */ |
470 |
> |
rayclear(&sr); |
471 |
> |
rayvalue(&sr); |
472 |
> |
multcolor(sr.rcol, sr.rcoef); |
473 |
> |
addcolor(r->rcol, sr.rcol); |
474 |
> |
++nstaken; |
475 |
|
} |
476 |
|
ndims--; |
477 |
|
} |