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/* RCSid: $Id$ */
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/*
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* Common definitions for interreflection routines.
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*
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* Include after ray.h
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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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/*
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* Since we've defined our vectors as float below to save space,
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* watch out for changes in the definitions of VCOPY() and DOT()
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* and don't pass these vectors to fvect routines.
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*/
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typedef struct ambrec {
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unsigned long latick; /* last accessed tick */
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float pos[3]; /* position in space */
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float dir[3]; /* normal direction */
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int lvl; /* recursion level of parent ray */
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float weight; /* weight of parent ray */
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float rad; /* validity radius */
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COLOR val; /* computed ambient value */
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float gpos[3]; /* gradient wrt. position */
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float gdir[3]; /* gradient wrt. direction */
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struct ambrec *next; /* next in list */
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} AMBVAL; /* ambient value */
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typedef struct ambtree {
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AMBVAL *alist; /* ambient value list */
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struct ambtree *kid; /* 8 child nodes */
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} AMBTREE; /* ambient octree */
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typedef struct {
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short t, p; /* theta, phi indices */
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COLOR v; /* value sum */
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float r; /* 1/distance sum */
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float k; /* variance for this division */
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int n; /* number of subsamples */
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} AMBSAMP; /* ambient sample division */
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typedef struct {
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FVECT ux, uy, uz; /* x, y and z axis directions */
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short nt, np; /* number of theta and phi directions */
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} AMBHEMI; /* ambient sample hemisphere */
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extern double maxarad; /* maximum ambient radius */
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extern double minarad; /* minimum ambient radius */
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#define AVGREFL 0.5 /* assumed average reflectance */
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#define AMBVALSIZ 75 /* number of bytes in portable AMBVAL struct */
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#define AMBMAGIC 557 /* magic number for ambient value files */
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#define AMBFMT "Radiance_ambval" /* format id string */
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#ifdef NOPROTO
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extern int divsample();
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extern double doambient();
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extern void inithemi();
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extern void comperrs();
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extern void posgradient();
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extern void dirgradient();
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extern void setambres();
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extern void setambacc();
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extern void setambient();
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extern void ambdone();
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extern void ambnotify();
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extern void ambient();
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extern double sumambient();
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extern double makeambient();
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extern void extambient();
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extern int ambsync();
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extern void putambmagic();
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extern int hasambmagic();
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extern int writambval();
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extern int ambvalOK();
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extern int readambval();
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extern void lookamb();
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extern void writamb();
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#else
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/* defined in ambcomp.c */
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extern int divsample(AMBSAMP *dp, AMBHEMI *h, RAY *r);
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extern double doambient(COLOR acol, RAY *r, double wt, FVECT pg, FVECT dg);
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extern void inithemi(AMBHEMI *hp, RAY *r, double wt);
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extern void comperrs(AMBSAMP *da, AMBHEMI *hp);
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extern void posgradient(FVECT gv, AMBSAMP *da, AMBHEMI *hp);
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extern void dirgradient(FVECT gv, AMBSAMP *da, AMBHEMI *hp);
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/* defined in ambient.c */
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extern void setambres(int ar);
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extern void setambacc(double newa);
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extern void setambient(void);
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extern void ambdone(void);
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extern void ambnotify(OBJECT obj);
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extern void ambient(COLOR acol, RAY *r, FVECT nrm);
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extern double sumambient(COLOR acol, RAY *r, FVECT rn, int al,
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AMBTREE *at, FVECT c0, double s);
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extern double makeambient(COLOR acol, RAY *r, FVECT rn, int al);
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extern void extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
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extern int ambsync(void);
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/* defined in ambio.c */
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extern void putambmagic(FILE *fp);
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extern int hasambmagic(FILE *fp);
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extern int writambval(AMBVAL *av, FILE *fp);
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extern int ambvalOK(AMBVAL *av);
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extern int readambval(AMBVAL *av, FILE *fp);
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/* defined in lookamb.c */
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extern void lookamb(FILE *fp);
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extern void writamb(FILE *fp);
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#endif
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