Struct avian3d::collision::CollisionLayers

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pub struct CollisionLayers {
    pub memberships: LayerMask,
    pub filters: LayerMask,
}
Expand description

Defines the collision layers of a collider using memberships and filters.

Memberships indicate what layers the collider is a part of.
Filters indicate what layers the collider can interact with.

Two colliders A and B can interact if and only if:

  • The memberships of A contain a layer that is also in the filters of B
  • The memberships of B contain a layer that is also in the filters of A

Colliders without this component can be considered as having all memberships and filters, and they can interact with everything that belongs on any layer.

§Creation

Collision layers store memberships and filters using LayerMasks. A LayerMask can be created using bitmasks, or by creating an enum that implements PhysicsLayer.

Many CollisionLayers methods can take any type that implements Into<LayerMask>. For example, you can use bitmasks with CollisionLayers::new:

// Belongs to the second layer and interacts with colliders
// on the first, second, and third layer.
let layers = CollisionLayers::new(0b00010, 0b0111);

You can also use an enum that implements PhysicsLayer:

#[derive(PhysicsLayer)]
enum GameLayer {
    Player, // Layer 0
    Enemy,  // Layer 1
    Ground, // Layer 2
}

// Player collides with enemies and the ground, but not with other players
let layers = CollisionLayers::new(GameLayer::Player, [GameLayer::Enemy, GameLayer::Ground]);

You can also use LayerMask directly:

// Belongs to the first layer and interacts with all layers.
let layers = CollisionLayers::new(LayerMask(0b0001), LayerMask::ALL);

Layers can also be defined using constants and bitwise operations:

// `1 << n` is bitshifting: the first layer shifted by `n` layers.
pub const FIRST_LAYER: u32 = 1 << 0;
pub const SECOND_LAYER: u32 = 1 << 1;
pub const LAST_LAYER: u32 = 1 << 31;

fn spawn(mut commands: Commands) {
    // This collider belongs to the first two layers and can interact with the last layer.
    commands.spawn((
        Collider::sphere(0.5),
        CollisionLayers::from_bits(FIRST_LAYER | SECOND_LAYER, LAST_LAYER),
    ));
}

§Modifying layers

Existing CollisionLayers can be modified by simply accessing the memberships and filters and changing their LayerMasks.

let mut layers = CollisionLayers::new(0b0010, 0b1011);

// Add memberships (these are equivalent)
layers.memberships.add(0b0001);
layers.memberships |= 0b0001;

assert_eq!(layers.memberships, 0b0011);

// Remove filters
layers.filters.remove(0b0001);
layers.filters &= !0b0001;

assert_eq!(layers.filters, 0b1010);

// Check if layers are contained
assert!(layers.memberships.has_all(0b0011));
assert!((layers.memberships & 0b0011) != 0);

Fields§

§memberships: LayerMask

The layers that an entity belongs to.

§filters: LayerMask

The layers that an entity can interact with.

Implementations§

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impl CollisionLayers

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pub const ALL: Self = _

Contains all memberships and filters.

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pub const NONE: Self = _

Contains no memberships and no filters.

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pub const ALL_MEMBERSHIPS: Self = _

Contains all memberships but no filters.

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pub const ALL_FILTERS: Self = _

Contains all filters but no memberships.

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pub fn new( memberships: impl Into<LayerMask>, filters: impl Into<LayerMask> ) -> Self

Creates a new CollisionLayers configuration with the given collision memberships and filters.

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pub const fn from_bits(memberships: u32, filters: u32) -> Self

Creates a new CollisionLayers configuration using bits.

There is one bit per group and mask, so there are a total of 32 layers. For example, if an entity is a part of the layers [0, 1, 3] and can interact with the layers [1, 2], the memberships in bits would be 0b01011 while the filters would be 0b00110.

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pub fn interacts_with(self, other: Self) -> bool

Returns true if an entity with this CollisionLayers configuration can interact with an entity with the other CollisionLayers configuration.

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impl Clone for CollisionLayers

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fn clone(&self) -> CollisionLayers

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Component for CollisionLayers
where Self: Send + Sync + 'static,

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const STORAGE_TYPE: StorageType = bevy::ecs::component::StorageType::Table

A constant indicating the storage type used for this component.
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fn register_component_hooks(_hooks: &mut ComponentHooks)

Called when registering this component, allowing mutable access to its ComponentHooks.
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impl Debug for CollisionLayers

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

Formats the value using the given formatter. Read more
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impl Default for CollisionLayers

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl FromReflect for CollisionLayers
where Self: Any + Send + Sync, LayerMask: FromReflect + TypePath + RegisterForReflection,

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fn from_reflect(reflect: &dyn Reflect) -> Option<Self>

Constructs a concrete instance of Self from a reflected value.
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fn take_from_reflect( reflect: Box<dyn Reflect> ) -> Result<Self, Box<dyn Reflect>>

Attempts to downcast the given value to Self using, constructing the value using from_reflect if that fails. Read more
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impl GetTypeRegistration for CollisionLayers
where Self: Any + Send + Sync, LayerMask: FromReflect + TypePath + RegisterForReflection,

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fn get_type_registration() -> TypeRegistration

Returns the default TypeRegistration for this type.
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fn register_type_dependencies(registry: &mut TypeRegistry)

Registers other types needed by this type. Read more
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impl PartialEq for CollisionLayers

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fn eq(&self, other: &CollisionLayers) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Reflect for CollisionLayers
where Self: Any + Send + Sync, LayerMask: FromReflect + TypePath + RegisterForReflection,

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fn get_represented_type_info(&self) -> Option<&'static TypeInfo>

Returns the TypeInfo of the type represented by this value. Read more
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fn into_any(self: Box<Self>) -> Box<dyn Any>

Returns the value as a Box<dyn Any>.
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Returns the value as a &dyn Any.
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Returns the value as a &mut dyn Any.
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Casts this type to a boxed reflected value.
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Casts this type to a reflected value.
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Casts this type to a mutable reflected value.
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Clones the value as a Reflect trait object. Read more
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Performs a type-checked assignment of a reflected value to this value. Read more
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Tries to apply a reflected value to this value. Read more
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Returns a “partial equality” comparison result. Read more
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fn debug(&self, f: &mut Formatter<'_>) -> Result

Debug formatter for the value. Read more
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Applies a reflected value to this value. Read more
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Returns a hash of the value (which includes the type). Read more
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Returns a serializable version of the value. Read more
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fn is_dynamic(&self) -> bool

Indicates whether or not this type is a dynamic type. Read more
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impl Struct for CollisionLayers
where Self: Any + Send + Sync, LayerMask: FromReflect + TypePath + RegisterForReflection,

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fn field(&self, name: &str) -> Option<&dyn Reflect>

Returns a reference to the value of the field named name as a &dyn Reflect.
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Returns a mutable reference to the value of the field named name as a &mut dyn Reflect.
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Returns a reference to the value of the field with index index as a &dyn Reflect.
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fn field_at_mut(&mut self, index: usize) -> Option<&mut dyn Reflect>

Returns a mutable reference to the value of the field with index index as a &mut dyn Reflect.
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fn name_at(&self, index: usize) -> Option<&str>

Returns the name of the field with index index.
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fn field_len(&self) -> usize

Returns the number of fields in the struct.
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fn iter_fields(&self) -> FieldIter<'_>

Returns an iterator over the values of the reflectable fields for this struct.
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fn clone_dynamic(&self) -> DynamicStruct

Clones the struct into a DynamicStruct.
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impl TypePath for CollisionLayers
where Self: Any + Send + Sync,

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fn type_path() -> &'static str

Returns the fully qualified path of the underlying type. Read more
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fn short_type_path() -> &'static str

Returns a short, pretty-print enabled path to the type. Read more
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Returns the name of the type, or None if it is anonymous. Read more
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Returns the name of the crate the type is in, or None if it is anonymous. Read more
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fn module_path() -> Option<&'static str>

Returns the path to the module the type is in, or None if it is anonymous. Read more
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impl Typed for CollisionLayers
where Self: Any + Send + Sync, LayerMask: FromReflect + TypePath + RegisterForReflection,

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fn type_info() -> &'static TypeInfo

Returns the compile-time info for the underlying type.
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impl Copy for CollisionLayers

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impl Eq for CollisionLayers

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impl StructuralPartialEq for CollisionLayers

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