Struct Drag 

pub struct Drag {
    pub coefficient: f64,
}

Per-step exponential velocity damping; simulation operator order is explicit.

Fields

coefficient: f64

Exponential damping rate per second; finite and nonnegative.

Implementations

impl Drag

pub fn new(coefficient: f64) -> Self

Creates a damping rate.

Trait Implementations

impl Clone for Drag

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Drag

impl Debug for Drag

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl ParticleModifier for Drag

fn apply( &self, particle: &mut Particle, step: f32, _: Time, _: &mut Random, ) -> Result<(), ValidationError>

Updates one live particle; index and canonical age remain engine-owned.

fn resets_color(&self) -> bool

Requests birth-color restoration before the ordered modifier chain. Multiplicative lifetime energy curves use this to avoid frame-count accumulation.

fn work(&self) -> u64

Conservative per-particle operator work charged before replay.

fn apply_event( &self, particle: &mut Particle, step_seconds: f32, time: Time, random: &mut Random, ) -> Result<bool, ValidationError>

Optional predicted-step collision response, preserving the original callback API.