Struct bevy::transform::components::Transform

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

Expand description

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 by systems in the system set TransformPropagate.

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

Examples

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: Transform = _

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) -> Transform

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) -> Transform

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

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

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

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

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

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

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) -> Transform

Returns this Transform with a new rotation so that Transform::forward points towards the target position and Transform::up points towards up.

In some cases it’s not possible to construct a rotation. Another axis will be picked in those cases:

if target is the same as the transform translation, Vec3::Z is used instead
if up is zero, Vec3::Y is used instead
if the resulting forward direction is parallel with up, an orthogonal vector is used as the “right” direction

pub fn looking_to(self, direction: Vec3, up: Vec3) -> Transform

Returns this Transform with a new rotation so that Transform::forward points in the given direction and Transform::up points towards up.

In some cases it’s not possible to construct a rotation. Another axis will be picked in those cases:

if direction is zero, Vec3::Z is used instead
if up is zero, Vec3::Y is used instead
if direction is parallel with up, an orthogonal vector is used as the “right” direction

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

Returns this Transform with a new translation.

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

Returns this Transform with a new rotation.

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

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 Transform::forward points towards the target position, and Transform::up points towards up.

In some cases it’s not possible to construct a rotation. Another axis will be picked in those cases:

if target is the same as the transform translation, Vec3::Z is used instead
if up is zero, Vec3::Y is used instead
if the resulting forward direction is parallel with up, an orthogonal vector is used as the “right” direction

pub fn look_to(&mut self, direction: Vec3, up: Vec3)

Rotates this Transform so that Transform::forward points in the given direction and Transform::up points towards up.

In some cases it’s not possible to construct a rotation. Another axis will be picked in those cases:

if direction is zero, Vec3::NEG_Z is used instead
if up is zero, Vec3::Y is used instead
if direction is parallel with up, an orthogonal vector is used as the “right” direction

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

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.

pub fn is_finite(&self) -> bool

Returns true if, and only if, translation, rotation and scale all are finite. If any of them contains a NaN, positive or negative infinity, this will return false.