Struct bevy::core_pipeline::motion_blur::MotionBlur

pub struct MotionBlur {
    pub shutter_angle: f32,
    pub samples: u32,
}
Expand description

A component that enables and configures motion blur when added to a camera.

Motion blur is an effect that simulates how moving objects blur as they change position during the exposure of film, a sensor, or an eyeball.

Because rendering simulates discrete steps in time, we use per-pixel motion vectors to estimate the path of objects between frames. This kind of implementation has some artifacts:

  • Fast moving objects in front of a stationary object or when in front of empty space, will not have their edges blurred.
  • Transparent objects do not write to depth or motion vectors, so they cannot be blurred.

Other approaches, such as A Reconstruction Filter for Plausible Motion Blur produce more correct results, but are more expensive and complex, and have other kinds of artifacts. This implementation is relatively inexpensive and effective.

§Usage

Add the MotionBlur component to a camera to enable and configure motion blur for that camera. Motion blur also requires the depth and motion vector prepass, which can be added more easily to the camera with the MotionBlurBundle.

commands.spawn((
    Camera3dBundle::default(),
    MotionBlurBundle::default(),
));

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§shutter_angle: f32

The strength of motion blur from 0.0 to 1.0.

The shutter angle describes the fraction of a frame that a camera’s shutter is open and exposing the film/sensor. For 24fps cinematic film, a shutter angle of 0.5 (180 degrees) is common. This means that the shutter was open for half of the frame, or 1/48th of a second. The lower the shutter angle, the less exposure time and thus less blur.

A value greater than one is non-physical and results in an object’s blur stretching further than it traveled in that frame. This might be a desirable effect for artistic reasons, but consider allowing users to opt out of this.

This value is intentionally tied to framerate to avoid the aforementioned non-physical over-blurring. If you want to emulate a cinematic look, your options are:

  • Framelimit your app to 24fps, and set the shutter angle to 0.5 (180 deg). Note that depending on artistic intent or the action of a scene, it is common to set the shutter angle between 0.125 (45 deg) and 0.5 (180 deg). This is the most faithful way to reproduce the look of film.
  • Set the shutter angle greater than one. For example, to emulate the blur strength of film while rendering at 60fps, you would set the shutter angle to 60/24 * 0.5 = 1.25. Note that this will result in artifacts where the motion of objects will stretch further than they moved between frames; users may find this distracting.
§samples: u32

The quality of motion blur, corresponding to the number of per-pixel samples taken in each direction during blur.

Setting this to 1 results in each pixel being sampled once in the leading direction, once in the trailing direction, and once in the middle, for a total of 3 samples (1 * 2 + 1). Setting this to 3 will result in 3 * 2 + 1 = 7 samples. Setting this to 0 is equivalent to disabling motion blur.

Trait Implementations§

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impl Clone for MotionBlur

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fn clone(&self) -> MotionBlur

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 MotionBlur
where MotionBlur: 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 CreateFrom for MotionBlur
where MotionBlur: ShaderType<ExtraMetadata = StructMetadata<2>>, f32: for<'__> CreateFrom, u32: for<'__> CreateFrom,

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fn create_from<B>(reader: &mut Reader<B>) -> MotionBlur
where B: BufferRef,

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impl Default for MotionBlur

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fn default() -> MotionBlur

Returns the “default value” for a type. Read more
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impl ExtractComponent for MotionBlur

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type QueryData = &'static MotionBlur

ECS ReadOnlyQueryData to fetch the components to extract.
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type QueryFilter = With<Camera>

Filters the entities with additional constraints.
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type Out = MotionBlur

The output from extraction. Read more
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fn extract_component( item: <<MotionBlur as ExtractComponent>::QueryData as WorldQuery>::Item<'_>, ) -> Option<<MotionBlur as ExtractComponent>::Out>

Defines how the component is transferred into the “render world”.
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impl FromReflect for MotionBlur
where MotionBlur: Any + Send + Sync, f32: FromReflect + TypePath + RegisterForReflection, u32: FromReflect + TypePath + RegisterForReflection,

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fn from_reflect(reflect: &(dyn Reflect + 'static)) -> Option<MotionBlur>

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 MotionBlur
where MotionBlur: Any + Send + Sync, f32: FromReflect + TypePath + RegisterForReflection, u32: 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 ReadFrom for MotionBlur
where MotionBlur: ShaderType<ExtraMetadata = StructMetadata<2>>, f32: for<'__> ReadFrom, u32: for<'__> ReadFrom,

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fn read_from<B>(&mut self, reader: &mut Reader<B>)
where B: BufferRef,

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impl Reflect for MotionBlur
where MotionBlur: Any + Send + Sync, f32: FromReflect + TypePath + RegisterForReflection, u32: 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<MotionBlur>) -> Box<dyn Any>

Returns the value as a Box<dyn Any>.
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fn as_any(&self) -> &(dyn Any + 'static)

Returns the value as a &dyn Any.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Returns the value as a &mut dyn Any.
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fn into_reflect(self: Box<MotionBlur>) -> Box<dyn Reflect>

Casts this type to a boxed reflected value.
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fn as_reflect(&self) -> &(dyn Reflect + 'static)

Casts this type to a reflected value.
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fn as_reflect_mut(&mut self) -> &mut (dyn Reflect + 'static)

Casts this type to a mutable reflected value.
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fn clone_value(&self) -> Box<dyn Reflect>

Clones the value as a Reflect trait object. Read more
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fn set(&mut self, value: Box<dyn Reflect>) -> Result<(), Box<dyn Reflect>>

Performs a type-checked assignment of a reflected value to this value. Read more
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fn try_apply( &mut self, value: &(dyn Reflect + 'static), ) -> Result<(), ApplyError>

Tries to apply a reflected value to this value. Read more
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fn reflect_kind(&self) -> ReflectKind

Returns a zero-sized enumeration of “kinds” of type. Read more
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fn reflect_ref(&self) -> ReflectRef<'_>

Returns an immutable enumeration of “kinds” of type. Read more
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fn reflect_mut(&mut self) -> ReflectMut<'_>

Returns a mutable enumeration of “kinds” of type. Read more
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fn reflect_owned(self: Box<MotionBlur>) -> ReflectOwned

Returns an owned enumeration of “kinds” of type. Read more
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fn reflect_partial_eq(&self, value: &(dyn Reflect + 'static)) -> Option<bool>

Returns a “partial equality” comparison result. Read more
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fn apply(&mut self, value: &(dyn Reflect + 'static))

Applies a reflected value to this value. Read more
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fn reflect_hash(&self) -> Option<u64>

Returns a hash of the value (which includes the type). Read more
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fn debug(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Debug formatter for the value. Read more
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fn serializable(&self) -> Option<Serializable<'_>>

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 ShaderSize for MotionBlur

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const SHADER_SIZE: NonZero<u64> = _

Represents WGSL Size (equivalent to ShaderType::min_size)
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impl ShaderType for MotionBlur

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fn size(&self) -> NonZero<u64>

Returns the size of Self at runtime Read more
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fn min_size() -> NonZero<u64>

Represents the minimum size of Self (equivalent to GPUBufferBindingLayout.minBindingSize) Read more
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fn assert_uniform_compat()

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impl Struct for MotionBlur
where MotionBlur: Any + Send + Sync, f32: FromReflect + TypePath + RegisterForReflection, u32: FromReflect + TypePath + RegisterForReflection,

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

Returns a reference to the value of the field named name as a &dyn Reflect.
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fn field_mut(&mut self, name: &str) -> Option<&mut (dyn Reflect + 'static)>

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

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 + 'static)>

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

Returns the name of the type, or None if it is anonymous. Read more
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fn crate_name() -> Option<&'static str>

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 MotionBlur
where MotionBlur: Any + Send + Sync, f32: FromReflect + TypePath + RegisterForReflection, u32: 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 WriteInto for MotionBlur
where MotionBlur: ShaderType<ExtraMetadata = StructMetadata<2>>, f32: for<'__> WriteInto, u32: for<'__> WriteInto,

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fn write_into<B>(&self, writer: &mut Writer<B>)
where B: BufferMut,

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Gets the TypeId of self. Read more
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where U: ShaderType, &'a T: for<'a> Into<U>,

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fn as_bind_group_shader_type(&self, _images: &RenderAssets<GpuImage>) -> U

Return the T ShaderType for self. When used in AsBindGroup derives, it is safe to assume that all images in self exist.
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Mutably borrows from an owned value. Read more
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fn get_component_ids( components: &Components, ids: &mut impl FnMut(Option<ComponentId>), )

Gets this Bundle’s component ids. This will be None if the component has not been registered.
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Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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