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/* Copyright (c) 1988 Regents of the University of California */
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/* SCCSid "$SunId$ LBL" */
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/*
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* view.h - header file for image generation.
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*
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* 9/19/88
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*/
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/* view types */
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#define VT_PER 'v' /* perspective */
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#define VT_PAR 'l' /* parallel */
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#define VT_ANG 'a' /* angular fisheye */
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#define VT_HEM 'h' /* hemispherical fisheye */
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typedef struct {
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int type; /* view type */
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FVECT vp; /* view origin */
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FVECT vdir; /* view direction */
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FVECT vup; /* view up */
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double horiz; /* horizontal view size */
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double vert; /* vertical view size */
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double hoff; /* horizontal image offset */
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double voff; /* vertical image offset */
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FVECT hvec; /* computed horizontal image vector */
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FVECT vvec; /* computed vertical image vector */
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double hn2; /* DOT(hvec,hvec) */
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double vn2; /* DOT(vvec,vvec) */
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} VIEW; /* view parameters */
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extern VIEW stdview;
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extern char *setview();
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#define viewaspect(v) sqrt((v)->vn2/(v)->hn2)
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#define STDVIEW {VT_PER,{0.,0.,0.},{0.,1.,0.},{0.,0.,1.}, \
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45.,45.,0.,0.,{0.,0.,0.},{0.,0.,0.},0.,0.}
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#define VIEWSTR "VIEW="
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#define VIEWSTRL 5
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