Module interpolator 

Motion interpolation — smooth damp, exponential decay, spring followers. Motion interpolation — smooth damp, exponential decay, spring followers, and scalar / vector utility functions.

Functions

• smooth_damp / smooth_damp3 — Unity-style critically-damped smoothing with velocity output and optional max_speed clamp.
• exp_decay / exp_decay3 — Simple exponential decay (no velocity tracking; cheaper than smooth damp).
• lerp, lerp3, remap, smoothstep, smootherstep — scalar and vector utilities.

Types

• SpringFollower — critically-damped spring that tracks a 1D target.
• SpringFollower3 — same for a [f64; 3] target.

Example

use oxiphysics::interpolator::{smooth_damp, SpringFollower};

let mut vel = 0.0_f64;
let out = smooth_damp(0.0, 10.0, &mut vel, 0.2, f64::INFINITY, 0.016);
assert!(out > 0.0 && out < 10.0);

let mut spring = SpringFollower::new(100.0);
let pos = spring.update(5.0, 0.016);
assert!(pos > 0.0);

Structs

SpringFollower

Critically-damped spring follower for a 1D scalar.

SpringFollower3

Critically-damped spring follower for a [f64; 3] vector.

Functions

exp_decay

Exponential decay toward target: current + (target − current)(1 − e^(−rate·dt)).

exp_decay3

Exponential decay for [f64; 3].

lerp

Linear interpolation: a + t*(b−a).

lerp3

Linear interpolation for [f64; 3] vectors.

remap

Remap value from range [in_min, in_max] to [out_min, out_max].

smooth_damp

Unity-style smooth damp — critically-damped spring with velocity continuity.

smooth_damp3

Smooth damp for [f64; 3] vectors.

smootherstep

Quintic smootherstep: 6t⁵ − 15t⁴ + 10t³ (zero first and second derivatives at 0 and 1).

smoothstep

Cubic Hermite smoothstep: 3t² − 2t³, clamped input.