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/* RCSid $Id: ambient.h,v 2.17 2010/10/05 18:05:23 greg Exp $ */
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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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#ifndef _RAD_AMBIENT_H_
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#define _RAD_AMBIENT_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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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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struct ambrec *next; /* next in list */
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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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} 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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COLOR v; /* division sum (partial) */
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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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unsigned short t, p; /* theta, phi indices */
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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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COLOR acoef; /* division contribution coefficient */
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int ns; /* number of super-samples */
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int 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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#ifndef AVGREFL
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#define AVGREFL 0.5 /* assumed average reflectance */
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#endif
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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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/* 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 multambient(COLOR aval, RAY *r, FVECT nrm);
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extern void ambdone(void);
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extern void ambnotify(OBJECT obj);
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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 ambcomp.c */
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extern double doambient(COLOR acol, RAY *r, double wt,
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FVECT pg, FVECT dg);
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extern void inithemi(AMBHEMI *hp, COLOR ac, RAY *r, double wt);
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extern int divsample(AMBSAMP *dp, AMBHEMI *h, RAY *r);
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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 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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#ifdef __cplusplus
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}
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#endif
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#endif /* _RAD_AMBIENT_H_ */
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