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/* RCSid $Id$ */
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/*
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* face.h - header for routines using polygonal faces.
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*/
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#include "copyright.h"
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#define VERTEX(f,n) ((f)->va + 3*(n))
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typedef struct { /* a polygonal face */
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FVECT norm; /* the plane's unit normal */
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FLOAT offset; /* plane equation: DOT(norm, v) == offset */
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FLOAT area; /* area of face */
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FLOAT *va; /* vertex array (o->oargs.farg) */
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short nv; /* # of vertices */
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short ax; /* axis closest to normal */
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} FACE;
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#ifdef NOPROTO
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extern FACE *getface();
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extern void freeface();
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extern int inface();
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#else
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extern FACE *getface(OBJREC *o);
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extern void freeface(OBJREC *o);
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extern int inface(FVECT p, FACE *f);
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#endif
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