Struct DirectionalLight 

pub struct DirectionalLight {
    pub color: Color,
    pub illuminance: f32,
    pub shadows_enabled: bool,
    pub soft_shadow_size: Option<f32>,
    pub affects_lightmapped_mesh_diffuse: bool,
    pub shadow_depth_bias: f32,
    pub shadow_normal_bias: f32,
}

A Directional light.

Directional lights don’t exist in reality but they are a good approximation for light sources VERY far away, like the sun or the moon.

The light shines along the forward direction of the entity’s transform. With a default transform this would be along the negative-Z axis.

Valid values for illuminance are:

Illuminance (lux)	Surfaces illuminated by
0.0001	Moonless, overcast night sky (starlight)
0.002	Moonless clear night sky with airglow
0.05–0.3	Full moon on a clear night
3.4	Dark limit of civil twilight under a clear sky
20–50	Public areas with dark surroundings
50	Family living room lights
80	Office building hallway/toilet lighting
100	Very dark overcast day
150	Train station platforms
320–500	Office lighting
400	Sunrise or sunset on a clear day.
1000	Overcast day; typical TV studio lighting
10,000–25,000	Full daylight (not direct sun)
32,000–100,000	Direct sunlight

Source: Wikipedia

Shadows

To enable shadows, set the shadows_enabled property to true.

Shadows are produced via cascaded shadow maps.

To modify the cascade setup, such as the number of cascades or the maximum shadow distance, change the CascadeShadowConfig component of the entity with the DirectionalLight.

To control the resolution of the shadow maps, use the DirectionalLightShadowMap resource.

Fields

color: Color

The color of the light.

By default, this is white.

illuminance: f32

Illuminance in lux (lumens per square meter), representing the amount of light projected onto surfaces by this light source. Lux is used here instead of lumens because a directional light illuminates all surfaces more-or-less the same way (depending on the angle of incidence). Lumens can only be specified for light sources which emit light from a specific area.

shadows_enabled: bool

Whether this light casts shadows.

Note that shadows are rather expensive and become more so with every light that casts them. In general, it’s best to aggressively limit the number of lights with shadows enabled to one or two at most.

soft_shadow_size: Option<f32>

Available on crate feature experimental_pbr_pcss only.

Whether soft shadows are enabled, and if so, the size of the light.

Soft shadows, also known as percentage-closer soft shadows or PCSS, cause shadows to become blurrier (i.e. their penumbra increases in radius) as they extend away from objects. The blurriness of the shadow depends on the size of the light; larger lights result in larger penumbras and therefore blurrier shadows.

Currently, soft shadows are rather noisy if not using the temporal mode. If you enable soft shadows, consider choosing ShadowFilteringMethod::Temporal and enabling temporal antialiasing (TAA) to smooth the noise out over time.

Note that soft shadows are significantly more expensive to render than hard shadows.

affects_lightmapped_mesh_diffuse: bool

Whether this directional light contributes diffuse lighting to meshes with lightmaps.

Set this to false if your lightmap baking tool bakes the direct diffuse light from this directional light into the lightmaps in order to avoid counting the radiance from this light twice. Note that the specular portion of the light is always considered, because Bevy currently has no means to bake specular light.

By default, this is set to true.

shadow_depth_bias: f32

A value that adjusts the tradeoff between self-shadowing artifacts and proximity of shadows to their casters.

This value frequently must be tuned to the specific scene; this is normal and a well-known part of the shadow mapping workflow. If set too low, unsightly shadow patterns appear on objects not in shadow as objects incorrectly cast shadows on themselves, known as shadow acne. If set too high, shadows detach from the objects casting them and seem to “fly” off the objects, known as Peter Panning.

shadow_normal_bias: f32

A bias applied along the direction of the fragment’s surface normal. It is scaled to the shadow map’s texel size so that it is automatically adjusted to the orthographic projection.

Implementations

impl DirectionalLight

pub const DEFAULT_SHADOW_DEPTH_BIAS: f32 = 0.02

pub const DEFAULT_SHADOW_NORMAL_BIAS: f32 = 1.8

Trait Implementations

impl Clone for DirectionalLight

fn clone(&self) -> DirectionalLight

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Component for DirectionalLight

where DirectionalLight: Send + Sync + 'static,

Required Components: Cascades, CascadesFrusta, CascadeShadowConfig, CascadesVisibleEntities, Transform, Visibility, VisibilityClass.

A component’s Required Components are inserted whenever it is inserted. Note that this will also insert the required components of the required components, recursively, in depth-first order.

const STORAGE_TYPE: StorageType = bevy_ecs::component::StorageType::Table

A constant indicating the storage type used for this component.

type Mutability = Mutable

A marker type to assist Bevy with determining if this component is mutable, or immutable. Mutable components will have Component<Mutability = Mutable>, while immutable components will instead have Component<Mutability = Immutable>.

fn register_required_components( _requiree: ComponentId, required_components: &mut RequiredComponentsRegistrator<'_, '_>, )

Registers required components.

fn on_add() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_add ComponentHook for this Component if one is defined.

fn clone_behavior() -> ComponentCloneBehavior

Called when registering this component, allowing to override clone function (or disable cloning altogether) for this component.

fn relationship_accessor() -> Option<ComponentRelationshipAccessor<DirectionalLight>>

Returns ComponentRelationshipAccessor required for working with relationships in dynamic contexts.

fn on_insert() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_insert ComponentHook for this Component if one is defined.

fn on_replace() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_replace ComponentHook for this Component if one is defined.

fn on_remove() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_remove ComponentHook for this Component if one is defined.

fn on_despawn() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_despawn ComponentHook for this Component if one is defined.

fn map_entities<E>(_this: &mut Self, _mapper: &mut E)

where E: EntityMapper,

Maps the entities on this component using the given EntityMapper. This is used to remap entities in contexts like scenes and entity cloning. When deriving Component, this is populated by annotating fields containing entities with #[entities]

impl Debug for DirectionalLight

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

Formats the value using the given formatter.

impl Default for DirectionalLight

fn default() -> DirectionalLight

Returns the “default value” for a type.

impl FromArg for DirectionalLight

type This<'from_arg> = DirectionalLight

The type to convert into.

fn from_arg( arg: Arg<'_>, ) -> Result<<DirectionalLight as FromArg>::This<'_>, ArgError>

Creates an item from an argument.

impl FromReflect for DirectionalLight

fn from_reflect( reflect: &(dyn PartialReflect + 'static), ) -> Option<DirectionalLight>

Constructs a concrete instance of Self from a reflected value.

fn take_from_reflect( reflect: Box<dyn PartialReflect>, ) -> Result<Self, Box<dyn PartialReflect>>

Attempts to downcast the given value to Self using, constructing the value using from_reflect if that fails.

impl GetOwnership for DirectionalLight

fn ownership() -> Ownership

Returns the ownership of Self.

impl GetTypeRegistration for DirectionalLight

fn get_type_registration() -> TypeRegistration

Returns the default TypeRegistration for this type.

fn register_type_dependencies(registry: &mut TypeRegistry)

Registers other types needed by this type.

impl IntoReturn for DirectionalLight

fn into_return<'into_return>(self) -> Return<'into_return>

where DirectionalLight: 'into_return,

Converts Self into a Return value.

impl PartialReflect for DirectionalLight

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

Returns the TypeInfo of the type represented by this value.

fn try_apply( &mut self, value: &(dyn PartialReflect + 'static), ) -> Result<(), ApplyError>

Tries to apply a reflected value to this value.

fn reflect_kind(&self) -> ReflectKind

Returns a zero-sized enumeration of “kinds” of type.

fn reflect_ref(&self) -> ReflectRef<'_>

Returns an immutable enumeration of “kinds” of type.

fn reflect_mut(&mut self) -> ReflectMut<'_>

Returns a mutable enumeration of “kinds” of type.

fn reflect_owned(self: Box<DirectionalLight>) -> ReflectOwned

Returns an owned enumeration of “kinds” of type.

fn try_into_reflect( self: Box<DirectionalLight>, ) -> Result<Box<dyn Reflect>, Box<dyn PartialReflect>>

Attempts to cast this type to a boxed, fully-reflected value.

fn try_as_reflect(&self) -> Option<&(dyn Reflect + 'static)>

Attempts to cast this type to a fully-reflected value.

fn try_as_reflect_mut(&mut self) -> Option<&mut (dyn Reflect + 'static)>

Attempts to cast this type to a mutable, fully-reflected value.

fn into_partial_reflect(self: Box<DirectionalLight>) -> Box<dyn PartialReflect>

Casts this type to a boxed, reflected value.

fn as_partial_reflect(&self) -> &(dyn PartialReflect + 'static)

Casts this type to a reflected value.

fn as_partial_reflect_mut(&mut self) -> &mut (dyn PartialReflect + 'static)

Casts this type to a mutable, reflected value.

fn reflect_partial_eq( &self, value: &(dyn PartialReflect + 'static), ) -> Option<bool>

Returns a “partial equality” comparison result.

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

Debug formatter for the value.

fn reflect_clone(&self) -> Result<Box<dyn Reflect>, ReflectCloneError>

Attempts to clone Self using reflection.

fn apply(&mut self, value: &(dyn PartialReflect + 'static))

Applies a reflected value to this value.

fn to_dynamic(&self) -> Box<dyn PartialReflect>

Converts this reflected value into its dynamic representation based on its kind.

fn reflect_clone_and_take<T>(&self) -> Result<T, ReflectCloneError>

where T: 'static, Self: Sized + TypePath,

For a type implementing PartialReflect, combines reflect_clone and take in a useful fashion, automatically constructing an appropriate ReflectCloneError if the downcast fails.

fn reflect_hash(&self) -> Option<u64>

Returns a hash of the value (which includes the type).

fn is_dynamic(&self) -> bool

Indicates whether or not this type is a dynamic type.

impl Reflect for DirectionalLight

fn into_any(self: Box<DirectionalLight>) -> Box<dyn Any>

Returns the value as a Box<dyn Any>.

fn as_any(&self) -> &(dyn Any + 'static)

Returns the value as a &dyn Any.

fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Returns the value as a &mut dyn Any.

fn into_reflect(self: Box<DirectionalLight>) -> Box<dyn Reflect>

Casts this type to a boxed, fully-reflected value.

fn as_reflect(&self) -> &(dyn Reflect + 'static)

Casts this type to a fully-reflected value.

fn as_reflect_mut(&mut self) -> &mut (dyn Reflect + 'static)

Casts this type to a mutable, fully-reflected value.

fn set(&mut self, value: Box<dyn Reflect>) -> Result<(), Box<dyn Reflect>>

Performs a type-checked assignment of a reflected value to this value.

impl Struct for DirectionalLight

fn field(&self, name: &str) -> Option<&(dyn PartialReflect + 'static)>

Returns a reference to the value of the field named name as a &dyn PartialReflect.

fn field_mut( &mut self, name: &str, ) -> Option<&mut (dyn PartialReflect + 'static)>

Returns a mutable reference to the value of the field named name as a &mut dyn PartialReflect.

fn field_at(&self, index: usize) -> Option<&(dyn PartialReflect + 'static)>

Returns a reference to the value of the field with index index as a &dyn PartialReflect.

fn field_at_mut( &mut self, index: usize, ) -> Option<&mut (dyn PartialReflect + 'static)>

Returns a mutable reference to the value of the field with index index as a &mut dyn PartialReflect.

fn name_at(&self, index: usize) -> Option<&str>

Returns the name of the field with index index.

fn field_len(&self) -> usize

Returns the number of fields in the struct.

fn iter_fields(&self) -> FieldIter<'_>

Returns an iterator over the values of the reflectable fields for this struct.

fn to_dynamic_struct(&self) -> DynamicStruct

Creates a new DynamicStruct from this struct.

fn get_represented_struct_info(&self) -> Option<&'static StructInfo>

Will return None if TypeInfo is not available.

impl TypePath for DirectionalLight

fn type_path() -> &'static str

Returns the fully qualified path of the underlying type.

fn short_type_path() -> &'static str

Returns a short, pretty-print enabled path to the type.

fn type_ident() -> Option<&'static str>

Returns the name of the type, or None if it is anonymous.

fn crate_name() -> Option<&'static str>

Returns the name of the crate the type is in, or None if it is anonymous.

fn module_path() -> Option<&'static str>

Returns the path to the module the type is in, or None if it is anonymous.

impl Typed for DirectionalLight

fn type_info() -> &'static TypeInfo

Returns the compile-time info for the underlying type.

impl Copy for DirectionalLight