Struct bevy_transform::components::Transform

pub struct Transform {
    pub translation: Vec3,
    pub rotation: Quat,
    pub scale: Vec3,
}

Describe the position of an entity. If the entity has a parent, the position is relative to its parent position.

• To place or move an entity, you should set its Transform.
• To get the global transform of an entity, you should get its GlobalTransform.
• To be displayed, an entity must have both a Transform and a GlobalTransform.
  • You may use the TransformBundle to guarantee this.

Transform and GlobalTransform

Transform is the position of an entity relative to its parent position, or the reference frame if it doesn’t have a Parent.

GlobalTransform is the position of an entity relative to the reference frame.

GlobalTransform is updated from Transform in the system transform_propagate_system.

This system runs in stage CoreStage::PostUpdate. If you update the Transform of an entity in this stage or after, you will notice a 1 frame lag before the GlobalTransform is updated.

Examples

• transform
• global_vs_local_translation

Fields

translation: Vec3

Position of the entity. In 2d, the last value of the Vec3 is used for z-ordering.

See the translations example for usage.

rotation: Quat

Rotation of the entity.

See the 3d_rotation example for usage.

scale: Vec3

Scale of the entity.

See the scale example for usage.

Implementations

impl Transform

pub const IDENTITY: Self = _

An identity Transform with no translation, rotation, and a scale of 1 on all axes.

pub const fn from_xyz(x: f32, y: f32, z: f32) -> Self

Creates a new Transform at the position (x, y, z). In 2d, the z component is used for z-ordering elements: higher z-value will be in front of lower z-value.

pub fn from_matrix(matrix: Mat4) -> Self

Extracts the translation, rotation, and scale from matrix. It must be a 3d affine transformation matrix.

pub const fn from_translation(translation: Vec3) -> Self

Creates a new Transform, with translation. Rotation will be 0 and scale 1 on all axes.

pub const fn from_rotation(rotation: Quat) -> Self

Creates a new Transform, with rotation. Translation will be 0 and scale 1 on all axes.

pub const fn from_scale(scale: Vec3) -> Self

Creates a new Transform, with scale. Translation will be 0 and rotation 0 on all axes.

pub fn looking_at(self, target: Vec3, up: Vec3) -> Self

Updates and returns this Transform by rotating it so that its unit vector in the local negative Z direction is toward target and its unit vector in the local Y direction is toward up.

pub const fn with_translation(self, translation: Vec3) -> Self

Returns this Transform with a new translation.

pub const fn with_rotation(self, rotation: Quat) -> Self

Returns this Transform with a new rotation.

pub const fn with_scale(self, scale: Vec3) -> Self

Returns this Transform with a new scale.

pub fn compute_matrix(&self) -> Mat4

Returns the 3d affine transformation matrix from this transforms translation, rotation, and scale.

pub fn compute_affine(&self) -> Affine3A

Returns the 3d affine transformation matrix from this transforms translation, rotation, and scale.

pub fn local_x(&self) -> Vec3

Get the unit vector in the local X direction.

pub fn left(&self) -> Vec3

Equivalent to -local_x()

pub fn right(&self) -> Vec3

Equivalent to local_x()

pub fn local_y(&self) -> Vec3

Get the unit vector in the local Y direction.

pub fn up(&self) -> Vec3

Equivalent to local_y()

pub fn down(&self) -> Vec3

Equivalent to -local_y()

pub fn local_z(&self) -> Vec3

Get the unit vector in the local Z direction.

pub fn forward(&self) -> Vec3

Equivalent to -local_z()

pub fn back(&self) -> Vec3

Equivalent to local_z()

pub fn rotate(&mut self, rotation: Quat)

Rotates this Transform by the given rotation.

If this Transform has a parent, the rotation is relative to the rotation of the parent.

Examples

• 3d_rotation

pub fn rotate_axis(&mut self, axis: Vec3, angle: f32)

Rotates this Transform around the given axis by angle (in radians).

If this Transform has a parent, the axis is relative to the rotation of the parent.

pub fn rotate_x(&mut self, angle: f32)

Rotates this Transform around the X axis by angle (in radians).

If this Transform has a parent, the axis is relative to the rotation of the parent.

pub fn rotate_y(&mut self, angle: f32)

Rotates this Transform around the Y axis by angle (in radians).

If this Transform has a parent, the axis is relative to the rotation of the parent.

pub fn rotate_z(&mut self, angle: f32)

Rotates this Transform around the Z axis by angle (in radians).

If this Transform has a parent, the axis is relative to the rotation of the parent.

pub fn rotate_local(&mut self, rotation: Quat)

Rotates this Transform by the given rotation.

The rotation is relative to this Transform’s current rotation.

pub fn rotate_local_axis(&mut self, axis: Vec3, angle: f32)

Rotates this Transform around its local axis by angle (in radians).

pub fn rotate_local_x(&mut self, angle: f32)

Rotates this Transform around its local X axis by angle (in radians).

pub fn rotate_local_y(&mut self, angle: f32)

Rotates this Transform around its local Y axis by angle (in radians).

pub fn rotate_local_z(&mut self, angle: f32)

Rotates this Transform around its local Z axis by angle (in radians).

pub fn translate_around(&mut self, point: Vec3, rotation: Quat)

Translates this Transform around a point in space.

If this Transform has a parent, the point is relative to the Transform of the parent.

pub fn rotate_around(&mut self, point: Vec3, rotation: Quat)

Rotates this Transform around a point in space.

If this Transform has a parent, the point is relative to the Transform of the parent.

pub fn look_at(&mut self, target: Vec3, up: Vec3)

Rotates this Transform so that its local negative Z direction is toward target and its local Y direction is toward up.

pub fn mul_transform(&self, transform: Transform) -> Self

Multiplies self with transform component by component, returning the resulting Transform

pub fn transform_point(&self, point: Vec3) -> Vec3

Transforms the given point, applying scale, rotation and translation.

If this Transform has a parent, this will transform a point that is relative to the parent’s Transform into one relative to this Transform.

If this Transform does not have a parent, this will transform a point that is in global space into one relative to this Transform.

If you want to transform a point in global space to the local space of this Transform, consider using GlobalTransform::transform_point() instead.

Trait Implementations

impl Clone for Transform

fn clone(&self) -> Transform

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Component for Transformwhere
    Self: Send + Sync + 'static,

type Storage = TableStorage

impl Debug for Transform

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

Formats the value using the given formatter.

impl Default for Transform

fn default() -> Self

Returns the “default value” for a type.

impl From<GlobalTransform> for Transform

The transform is expected to be non-degenerate and without shearing, or the output will be invalid.

fn from(transform: GlobalTransform) -> Self

Converts to this type from the input type.

impl From<Transform> for GlobalTransform

fn from(transform: Transform) -> Self

Converts to this type from the input type.

impl From<Transform> for TransformBundle

fn from(transform: Transform) -> Self

Converts to this type from the input type.

impl FromReflect for Transformwhere
    Vec3: FromReflect,
    Quat: FromReflect,
    Vec3: FromReflect,

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

Constructs a concrete instance of Self from a reflected value.

impl GetTypeRegistration for Transform

fn get_type_registration() -> TypeRegistration

impl Mul<Transform> for GlobalTransform

type Output = GlobalTransform

The resulting type after applying the * operator.

fn mul(self, transform: Transform) -> Self::Output

Performs the * operation.

impl Mul<Transform> for Transform

type Output = Transform

The resulting type after applying the * operator.

fn mul(self, transform: Transform) -> Self::Output

Performs the * operation.

impl Mul<Vec3> for Transform

type Output = Vec3

The resulting type after applying the * operator.

fn mul(self, value: Vec3) -> Self::Output

Performs the * operation.

impl PartialEq<Transform> for Transform

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

This method tests for self and other values to be equal, and is used by ==.

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.

impl Reflect for Transform

fn type_name(&self) -> &str

Returns the type name of the underlying type.

fn get_type_info(&self) -> &'static TypeInfo

Returns the TypeInfo of the underlying type.

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

Returns the value as a Box<dyn Any>.

fn as_any(&self) -> &dyn Any

Returns the value as a &dyn Any.

fn as_any_mut(&mut self) -> &mut dyn Any

Returns the value as a &mut dyn Any.

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

Casts this type to a boxed reflected value.

fn as_reflect(&self) -> &dyn Reflect

Casts this type to a reflected value.

fn as_reflect_mut(&mut self) -> &mut dyn Reflect

Casts this type to a mutable reflected value.

fn clone_value(&self) -> Box<dyn Reflect>

Clones the value as a Reflect trait object.

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

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

fn apply(&mut self, value: &dyn Reflect)

Applies a reflected value to this value.

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

Returns an enumeration of “kinds” of type.

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

Returns a mutable enumeration of “kinds” of type.

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

Returns an owned enumeration of “kinds” of type.

fn reflect_partial_eq(&self, value: &dyn Reflect) -> Option<bool>

Returns a “partial equality” comparison result.

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

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

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

Debug formatter for the value.

fn serializable(&self) -> Option<Serializable<'_>>

Returns a serializable version of the value.

impl Struct for Transform

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

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

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

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

fn field_at(&self, index: usize) -> Option<&dyn Reflect>

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

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.

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 clone_dynamic(&self) -> DynamicStruct

Clones the struct into a DynamicStruct.

impl Typed for Transform

fn type_info() -> &'static TypeInfo

Returns the compile-time info for the underlying type.

impl Copy for Transform

impl StructuralPartialEq for Transform