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ambient.h
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Tue, May 14, 09:12

ambient.h
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/* RCSid $Id: ambient.h,v 2.26 2022/03/07 17:52:14 greg Exp $ */
/*
* Common definitions for interreflection routines.
*
* Include after ray.h
*/
#ifndef _RAD_AMBIENT_H_
#define _RAD_AMBIENT_H_
#ifdef __cplusplus
extern "C" {
#endif
/*
* Normal and u-vector directions encoded using dircode.c
*/
typedef struct ambrec {
struct ambrec *next; /* next in list */
float pos[3]; /* position in space */
int32 ndir; /* encoded surface normal */
int32 udir; /* u-vector direction */
short lvl; /* recursion level of parent ray */
float weight; /* weight of parent ray */
float rad[2]; /* anisotropic radii (rad[0] <= rad[1]) */
COLOR val; /* computed ambient value */
float gpos[2]; /* (u,v) gradient wrt. position */
float gdir[2]; /* (u,v) gradient wrt. direction */
uint32 corral; /* potential light leak direction flags */
} AMBVAL; /* ambient value */
typedef struct ambtree {
AMBVAL *alist; /* ambient value list */
struct ambtree *kid; /* 8 child nodes */
} AMBTREE; /* ambient octree */
extern double maxarad; /* maximum ambient radius */
extern double minarad; /* minimum ambient radius */
#ifndef AVGREFL
#define AVGREFL 0.5 /* assumed average reflectance */
#endif
#define AMBVALSIZ 67 /* number of bytes in portable AMBVAL struct */
#define AMBMAGIC 559 /* magic number for ambient value files */
#define AMBFMT "Radiance_ambval" /* format id string */
/* defined in ambient.c */
extern void setambres(int ar);
extern void setambacc(double newa);
extern void setambient(void);
extern void multambient(COLOR aval, RAY *r, FVECT nrm);
extern void ambdone(void);
extern void ambnotify(OBJECT obj);
extern int ambsync(void);
/* defined in ambcomp.c */
extern int doambient(COLOR acol, RAY *r, double wt,
FVECT uv[2], float rad[2],
float gpos[2], float gdir[2], uint32 *crlp);
/* defined in ambio.c */
extern void putambmagic(FILE *fp);
extern int hasambmagic(FILE *fp);
extern int writambval(AMBVAL *av, FILE *fp);
extern int readambval(AMBVAL *av, FILE *fp);
extern int ambvalOK(AMBVAL *av);
#ifdef __cplusplus
}
#endif
#endif /* _RAD_AMBIENT_H_ */

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