Function fovray_c

pub unsafe extern "C" fn fovray_c(
    inst: *const c_char,
    raydir: *const c_double,
    rframe: *const c_char,
    abcorr: *const c_char,
    obsrvr: *const c_char,
    et: *const c_double,
    visible: *mut SpiceBoolean,
)

determines if a specified ray is within the FOV of a specified instrument at a given time.