Struct View 

pub struct View<'a> {
    pub dt: f32,
    pub elapsed: f32,
    pub vars: &'a [Val],
    pub locals: &'a [Val],
    pub bindings: &'a mut [Option<Val>],
    pub queries: &'a [Vec<Entity>],
    pub by_name: &'a dyn Fn(AssetId) -> Option<Entity>,
    pub transforms: &'a dyn Fn(Entity) -> Option<Transform>,
    pub alive: &'a dyn Fn(Entity) -> bool,
    pub self_entity: Option<Entity>,
    pub trace: &'a mut Option<Vec<u32>>,
}

What a behavior may read this tick.

Fields

dt: f32

Seconds this tick advances.

elapsed: f32

Seconds of simulated time so far.

vars: &'a [Val]

The world’s variables, in slot order.

locals: &'a [Val]

This instance’s locals, in slot order.

bindings: &'a mut [Option<Val>]

Exactly as wide as the body’s binding high-water mark, so a slot is always in range and the frame never grows mid-run.

queries: &'a [Vec<Entity>]

The entities each declared query selected this tick, in slot order.

by_name: &'a dyn Fn(AssetId) -> Option<Entity>

Resolves a name to the entity carrying it.

transforms: &'a dyn Fn(Entity) -> Option<Transform>

Reads an entity’s transform.

alive: &'a dyn Fn(Entity) -> bool

Whether an entity still exists.

self_entity: Option<Entity>

The entity this run is scoped to, if any.

trace: &'a mut Option<Vec<u32>>

Node ids executed this run, recorded only while tracing is requested (None costs one branch per node).