Struct WorldDef 

pub struct WorldDef {

    pub gravity: Vec2,
    pub restitution_threshold: f32,
    pub hit_event_threshold: f32,
    pub contact_hertz: f32,
    pub contact_damping_ratio: f32,
    pub contact_speed: f32,
    pub maximum_linear_speed: f32,
    pub friction_callback: Option<FrictionCallback>,
    pub restitution_callback: Option<RestitutionCallback>,
    pub enable_sleep: bool,
    pub enable_continuous: bool,
    pub enable_contact_softening: bool,
    pub worker_count: i32,
    pub user_data: u64,
    pub capacity: Capacity,
    pub internal_value: i32,
}

World definition used to create a simulation world. Must be initialized using default_world_def. (b2WorldDef)

PartialEq is intentionally not derived: it holds optional function-pointer callbacks, and function-pointer equality is not meaningful.

Fields

gravity: Vec2

Gravity vector. Box2D has no up-vector defined.

restitution_threshold: f32

Restitution speed threshold, usually in m/s. Collisions above this speed have restitution applied (will bounce).

hit_event_threshold: f32

Threshold speed for hit events. Usually meters per second.

contact_hertz: f32

Contact stiffness. Cycles per second.

contact_damping_ratio: f32

Contact bounciness. Non-dimensional.

contact_speed: f32

Speed cap on overlap resolution, usually meters per second.

maximum_linear_speed: f32

Maximum linear speed. Usually meters per second.

friction_callback: Option<FrictionCallback>

Optional mixing callback for friction.

restitution_callback: Option<RestitutionCallback>

Optional mixing callback for restitution.

enable_sleep: bool

Can bodies go to sleep to improve performance.

enable_continuous: bool

Enable continuous collision.

enable_contact_softening: bool

Contact softening when mass ratios are large. Experimental.

worker_count: i32

Number of workers for multithreading, clamped to [1, MAX_WORKERS].

user_data: u64

User data.

capacity: Capacity

Optional initial capacities.

internal_value: i32

Used internally to detect a valid definition. DO NOT SET.

Trait Implementations

impl Clone for WorldDef

fn clone(&self) -> WorldDef

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for WorldDef

impl Debug for WorldDef

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

Formats the value using the given formatter.

impl Default for WorldDef

fn default() -> Self

Returns the “default value” for a type.