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/* Copyright (c) 1991 Regents of the University of California */
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/* SCCSid "$SunId$ LBL" */
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/*
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* Common definitions for interreflection routines.
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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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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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extern COLOR ambval; /* global ambient component */
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extern double ambacc; /* ambient accuracy */
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extern int ambres; /* ambient resolution */
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extern int ambdiv; /* number of divisions for calculation */
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extern int ambssamp; /* number of super-samples */
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extern int ambounce; /* number of ambient bounces */
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extern char *amblist[]; /* ambient include/exclude list */
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extern int ambincl; /* include == 1, exclude == 0 */
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extern double maxarad; /* maximum ambient radius */
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extern double minarad; /* minimum ambient radius */
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extern double sumambient(), doambient(), makeambient();
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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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