Struct FastIntegrationParams 

pub struct FastIntegrationParams {
    pub horiz: f64,
    pub vert: f64,
    pub initial_state: [f64; 6],
    pub t_span: (f64, f64),
    pub atmo_params: (f64, f64, f64, f64),
    pub atmo_sock: Option<AtmoSock>,
}

Fast trajectory integration parameters

Fields

horiz: f64

vert: f64

initial_state: [f64; 6]

Launch state [x, y, z, vx, vy, vz] in the shot frame. y is measured from the level BallisticInputs::muzzle_height is measured from: the ground when it is nonzero (start y at muzzle_height), the bore when it is 0 (start y at 0). Boundary-layer wind shear reads its height above the ground from that datum.

t_span: (f64, f64)

atmo_params: (f64, f64, f64, f64)

Dual-mode atmosphere tuple. Standard mode is (base_alt_m, base_temp_c, base_pressure_hPa, base_density_ratio) (slot 3 is a density RATIO, not humidity; nonpositive means “not supplied” and falls back to 1.0, while a supplied ratio must be below 2.0). Direct mode is (air_density, speed_of_sound, 0.0, 0.0).

atmo_sock: Option<AtmoSock>

MBA-1137: optional downrange-segmented atmosphere. When Some, the per-substep drag density samples the base (station-referenced) T/P/H for the zone at the current downrange distance before applying the altitude lapse. None (default) keeps the single-station base and — combined with the MBA-1137 density-freeze fix — varies density with altitude only.