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/* Copyright (c) 1986 Regents of the University of California */
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/* SCCSid "$SunId$ LBL" */
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/*
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* cone.h - header file for cones (cones, cylinders, rings, cups, tubes).
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*
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* Storage of arguments in the cone structure is a little strange.
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* To save space, we use an index into the real arguments of the
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* object structure through ca. The indices are for the axis
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* endpoints and radii: p0, p1, r0 and r1.
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*
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* 2/12/86
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*/
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typedef struct cone {
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double *ca; /* cone arguments (o->oargs.farg) */
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char p0, p1; /* indices for endpoints */
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char r0, r1; /* indices for radii */
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FVECT ad; /* axis direction vector */
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double al; /* axis length */
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double sl; /* side length */
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double (*tm)[4]; /* pointer to transformation matrix */
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} CONE;
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#define CO_R0(co) ((co)->ca[(co)->r0])
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#define CO_R1(co) ((co)->ca[(co)->r1])
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#define CO_P0(co) ((co)->ca+(co)->p0)
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#define CO_P1(co) ((co)->ca+(co)->p1)
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extern CONE *getcone();
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