API

Matter.Body

Methods
Properties / Options
Events

Defined in: src/body/Body.js:1

The Matter.Body module contains methods for creating and manipulating rigid bodies. For creating bodies with common configurations such as rectangles, circles and other polygons see the module Matter.Bodies.

See the included usage examples.

Methods

Matter.Body._initProperties

(body, [options])

private

Initialises body properties.

Parameters

body Body
[options] Object optional

src/body/Body.js:136 · Usages · Examples

Matter.Body._totalProperties

(body)

→ Object private

Returns the sums of the properties of all compound parts of the parent body.

Parameters

body Body

Returns

src/body/Body.js:829 · Usages · Examples

Matter.Body.applyForce

(body, position, force)

Applies the force to the body from the force origin position in world-space, over a single timestep, including applying any resulting angular torque.

Forces are useful for effects like gravity, wind or rocket thrust, but can be difficult in practice when precise control is needed. In these cases see Body.setVelocity and Body.setPosition as an alternative.

The force from this function is only applied once for the duration of a single timestep, in other words the duration depends directly on the current engine update delta and the rate of calls to this function.

Therefore to account for time, you should apply the force constantly over as many engine updates as equivalent to the intended duration.

If all or part of the force duration is some fraction of a timestep, first multiply the force by duration / timestep.

The force origin position in world-space must also be specified. Passing body.position will result in zero angular effect as the force origin would be at the centre of mass.

The body will take time to accelerate under a force, the resulting effect depends on duration of the force, the body mass and other forces on the body including friction combined.

Parameters

body Body
position Vector

The force origin in world-space. Pass body.position to avoid angular torque.
force Vector

src/body/Body.js:803 · Usages · Examples

Matter.Body.create

(options)

→ Body

Creates a new rigid body model. The options parameter is an object that specifies any properties you wish to override the defaults. All properties have default values, and many are pre-calculated automatically based on other properties. Vertices must be specified in clockwise order. See the properties section below for detailed information on what you can pass via the options object.

Parameters

options Object

Returns

Body

body

src/body/Body.js:30 · Usages · Examples

Matter.Body.getAngularSpeed

(body)

→ Number

Gets the current rotational speed of the body.
Equivalent to the magnitude of its angular velocity.

Parameters

body Body

Returns

Number

angular speed

src/body/Body.js:605 · Usages · Examples

Matter.Body.getAngularVelocity

(body)

→ Number

Gets the current rotational velocity of the body.

Parameters

body Body

Returns

Number

angular velocity

src/body/Body.js:595 · Usages · Examples

Matter.Body.getSpeed

(body)

→ Number

Gets the current linear speed of the body.
Equivalent to the magnitude of its velocity.

Parameters

body Body

Returns

Number

speed

src/body/Body.js:559 · Usages · Examples

Matter.Body.getVelocity

(body)

→ Vector

Gets the current linear velocity of the body.

Parameters

body Body

Returns

Vector

velocity

src/body/Body.js:544 · Usages · Examples

Matter.Body.nextCategory

()

→ Number

Returns the next unique category bitfield (starting after the initial default category 0x0001). There are 32 available. See body.collisionFilter for more information.

Returns

Number

Unique category bitfield

src/body/Body.js:125 · Usages · Examples

Matter.Body.nextGroup

([isNonColliding=false])

→ Number

Returns the next unique group index for which bodies will collide. If isNonColliding is true, returns the next unique group index for which bodies will not collide. See body.collisionFilter for more information.

Parameters

[isNonColliding=false] Bool optional

Returns

Number

Unique group index

src/body/Body.js:110 · Usages · Examples

Matter.Body.rotate

(body, rotation, [point], [updateVelocity=false])

Rotates a body by a given angle relative to its current angle. By default angular velocity is unchanged. If updateVelocity is true then angular velocity is inferred from the change in angle.

Parameters

body Body
rotation Number
[point] Vector optional
[updateVelocity=false] Boolean optional

src/body/Body.js:639 · Usages · Examples

Matter.Body.scale

(body, scaleX, scaleY, [point])

Scales the body, including updating physical properties (mass, area, axes, inertia), from a world-space point (default is body centre).

Parameters

body Body
scaleX Number
scaleY Number
[point] Vector optional

src/body/Body.js:666 · Usages · Examples

Matter.Body.set

(body, settings, value)

Given a property and a value (or map of), sets the property(s) on the body, using the appropriate setter functions if they exist. Prefer to use the actual setter functions in performance critical situations.

Parameters

body Body
settings Object

A property name (or map of properties and values) to set on the body.
value Object

The value to set if settings is a single property name.

src/body/Body.js:181 · Usages · Examples

Matter.Body.setAngle

(body, angle, [updateVelocity=false])

Sets the angle of the body. By default angular velocity is unchanged. If updateVelocity is true then angular velocity is inferred from the change in angle.

Parameters

body Body
angle Number
[updateVelocity=false] Boolean optional

src/body/Body.js:497 · Usages · Examples

Matter.Body.setAngularSpeed

(body, speed)

Sets the current rotational speed of the body.
Direction is maintained. Affects body angular velocity.

Parameters

body Body
speed Number

src/body/Body.js:616 · Usages · Examples

Matter.Body.setAngularVelocity

(body, velocity)

Sets the current rotational velocity of the body.
Affects body angular speed.

Parameters

body Body
velocity Number

src/body/Body.js:581 · Usages · Examples

Matter.Body.setCentre

(body, centre, relative)

Set the centre of mass of the body. The centre is a vector in world-space unless relative is set, in which case it is a translation. The centre of mass is the point the body rotates about and can be used to simulate non-uniform density. This is equal to moving body.position but not the body.vertices. Invalid if the centre falls outside the body's convex hull.

Parameters

body Body
centre Vector
relative Bool

src/body/Body.js:441 · Usages · Examples

Matter.Body.setDensity

(body, density)

Sets the density of the body. Mass and inertia are automatically updated to reflect the change.

Parameters

body Body
density Number

src/body/Body.js:318 · Usages · Examples

Matter.Body.setInertia

(body, inertia)

Sets the moment of inertia of the body. This is the second moment of area in two dimensions. Inverse inertia is automatically updated to reflect the change. Mass is not changed.

Parameters

body Body
inertia Number

src/body/Body.js:329 · Usages · Examples

Matter.Body.setMass

(body, mass)

Sets the mass of the body. Inverse mass, density and inertia are automatically updated to reflect the change.

Parameters

body Body
mass Number

src/body/Body.js:302 · Usages · Examples

Matter.Body.setParts

(body, parts, [autoHull=true])

Sets the parts of the body and updates mass, inertia and centroid. Each part will have its parent set to body. By default the convex hull will be automatically computed and set on body, unless autoHull is set to false. Note that this method will ensure that the first part in body.parts will always be the body.

Parameters

body Body
parts Body[]
[autoHull=true] Bool optional

src/body/Body.js:378 · Usages · Examples

Matter.Body.setPosition

(body, position, [updateVelocity=false])

Sets the position of the body. By default velocity is unchanged. If updateVelocity is true then velocity is inferred from the change in position.

Parameters

body Body
position Vector
[updateVelocity=false] Boolean optional

src/body/Body.js:466 · Usages · Examples

Matter.Body.setSpeed

(body, speed)

Sets the current linear speed of the body.
Direction is maintained. Affects body velocity.

Parameters

body Body
speed Number

src/body/Body.js:570 · Usages · Examples

Matter.Body.setStatic

(body, isStatic)

Sets the body as static, including isStatic flag and setting mass and inertia to Infinity.

Parameters

body Body
isStatic Bool

src/body/Body.js:254 · Usages · Examples

Matter.Body.setVelocity

(body, velocity)

Sets the current linear velocity of the body.
Affects body speed.

Parameters

body Body
velocity Vector

src/body/Body.js:528 · Usages · Examples

Matter.Body.setVertices

(body, vertices)

Sets the body's vertices and updates body properties accordingly, including inertia, area and mass (with respect to body.density). Vertices will be automatically transformed to be orientated around their centre of mass as the origin. They are then automatically translated to world space based on body.position.

The vertices argument should be passed as an array of Matter.Vector points (or a Matter.Vertices array). Vertices must form a convex hull. Concave vertices must be decomposed into convex parts.

Parameters

body Body
vertices Vector[]

src/body/Body.js:341 · Usages · Examples

Matter.Body.translate

(body, translation, [updateVelocity=false])

Moves a body by a given vector relative to its current position. By default velocity is unchanged. If updateVelocity is true then velocity is inferred from the change in position.

Parameters

body Body
translation Vector
[updateVelocity=false] Boolean optional

src/body/Body.js:627 · Usages · Examples

Matter.Body.update

(body, [deltaTime=16.666])

Performs an update by integrating the equations of motion on the body. This is applied every update by Matter.Engine automatically.

Parameters

body Body
[deltaTime=16.666] Number optional

src/body/Body.js:730 · Usages · Examples

Matter.Body.updateVelocities

(body)

Updates properties body.velocity, body.speed, body.angularVelocity and body.angularSpeed which are normalised in relation to Body._baseDelta.

Parameters

body Body

src/body/Body.js:786 · Usages · Examples

Properties / Options

The following properties if specified below are for objects created by Matter.Body.create and may be passed to it as options.

Body.`angle`

Number

A Number specifying the angle of the body, in radians.

Default: 0

src/body/Body.js:955 · Usages · Examples

Body.`angularSpeed`

Number

Read only. Use Body.setAngularSpeed to set.

See Body.getAngularSpeed for details.

Default: 0

src/body/Body.js:1042 · Usages · Examples

Body.`angularVelocity`

Number

Read only. Use Body.setAngularVelocity to set.

See Body.getAngularVelocity for details.

Default: 0

src/body/Body.js:1054 · Usages · Examples

Body.`area`

String

Read only. Calculated automatically when vertices are set.

A Number that measures the area of the body's convex hull.

src/body/Body.js:1421 · Usages · Examples

Body.`axes`

Vector[]

Read only. Calculated automatically when vertices are set.

An array of unique axis vectors (edge normals) used for collision detection. These are automatically calculated when vertices are set. They are constantly updated by Body.update during the simulation.

src/body/Body.js:1409 · Usages · Examples

Body.`bounds`

Bounds

A Bounds object that defines the AABB region for the body. It is automatically calculated when vertices are set and constantly updated by Body.update during simulation.

src/body/Body.js:1432 · Usages · Examples

Body.`collisionFilter`

Object

An Object that specifies the collision filtering properties of this body.

Collisions between two bodies will obey the following rules:

If the two bodies have the same non-zero value of collisionFilter.group, they will always collide if the value is positive, and they will never collide if the value is negative.
If the two bodies have different values of collisionFilter.group or if one (or both) of the bodies has a value of 0, then the category/mask rules apply as follows:

Each body belongs to a collision category, given by collisionFilter.category. This value is used as a bit field and the category should have only one bit set, meaning that the value of this property is a power of two in the range [1, 2^31]. Thus, there are 32 different collision categories available.

Each body also defines a collision bitmask, given by collisionFilter.mask which specifies the categories it collides with (the value is the bitwise AND value of all these categories).

Using the category/mask rules, two bodies A and B collide if each includes the other's category in its mask, i.e. (categoryA & maskB) !== 0 and (categoryB & maskA) !== 0 are both true.

src/body/Body.js:1226 · Usages · Examples

Body.`collisionFilter.category`

Object

A bit field that specifies the collision category this body belongs to. The category value should have only one bit set, for example 0x0001. This means there are up to 32 unique collision categories available. See body.collisionFilter for more information.

Default: 1

src/body/Body.js:1261 · Usages · Examples

Body.`collisionFilter.group`

Object

An Integer Number, that specifies the collision group this body belongs to. See body.collisionFilter for more information.

Default: 0

src/body/Body.js:1252 · Usages · Examples

Body.`collisionFilter.mask`

Object

A bit mask that specifies the collision categories this body may collide with. See body.collisionFilter for more information.

Default: -1

src/body/Body.js:1272 · Usages · Examples

Body.`deltaTime`

Number

Read only. Updated during engine update.

A Number that records the last delta time value used to update this body. Used to calculate speed and velocity.

Default: 1000 / 60

src/body/Body.js:1301 · Usages · Examples

Body.`density`

Number

Read only. Use Body.setDensity to set.

A Number that defines the density of the body (mass per unit area).

Mass will also be updated when set.

Default: 0.001

src/body/Body.js:1117 · Usages · Examples

Body.`force`

Vector

A Vector that accumulates the total force applied to the body for a single update. Force is zeroed after every Engine.update, so constant forces should be applied for every update they are needed. See also Body.applyForce.

Default: { x: 0, y: 0 }

src/body/Body.js:996 · Usages · Examples

Body.`friction`

Number

A Number that defines the friction of the body. The value is always positive and is in the range (0, 1). A value of 0 means that the body may slide indefinitely. A value of 1 means the body may come to a stop almost instantly after a force is applied.

The effects of the value may be non-linear. High values may be unstable depending on the body. The engine uses a Coulomb friction model including static and kinetic friction. Note that collision response is based on pairs of bodies, and that friction values are combined with the following formula:

Math.min(bodyA.friction, bodyB.friction)

Default: 0.1

src/body/Body.js:1187 · Usages · Examples

Body.`frictionAir`

Number

A Number that defines the air friction of the body (air resistance). A value of 0 means the body will never slow as it moves through space. The higher the value, the faster a body slows when moving through space. The effects of the value are non-linear.

Default: 0.01

src/body/Body.js:1215 · Usages · Examples

Body.`frictionStatic`

Number

A Number that defines the static friction of the body (in the Coulomb friction model). A value of 0 means the body will never 'stick' when it is nearly stationary and only dynamic friction is used. The higher the value (e.g. 10), the more force it will take to initially get the body moving when nearly stationary. This value is multiplied with the friction property to make it easier to change friction and maintain an appropriate amount of static friction.

Default: 0.5

src/body/Body.js:1204 · Usages · Examples

Body.`id`

Number

An integer Number uniquely identifying number generated in Body.create by Common.nextId.

src/body/Body.js:896 · Usages · Examples

Body.`inertia`

Number

Read only. Automatically calculated when vertices, mass or density are set or set through Body.setInertia.

A Number that defines the moment of inertia of the body. This is the second moment of area in two dimensions.

Can be manually set to Infinity to prevent rotation of the body. See Body.setInertia.

src/body/Body.js:1152 · Usages · Examples

Body.`inverseInertia`

Number

Read only. Automatically calculated when vertices, mass or density are set or calculated by Body.setInertia.

A Number that defines the inverse moment of inertia of the body (1 / inertia).

src/body/Body.js:1164 · Usages · Examples

Body.`inverseMass`

Number

Read only. Use Body.setMass to set.

A Number that defines the inverse mass of the body (1 / mass).

src/body/Body.js:1142 · Usages · Examples

Body.`isSensor`

Boolean

A flag that indicates whether a body is a sensor. Sensor triggers collision events, but doesn't react with colliding body physically.

Default: false

src/body/Body.js:1077 · Usages · Examples

Body.`isSleeping`

Boolean

Read only. Use Sleeping.set to set.

A flag that indicates whether the body is considered sleeping. A sleeping body acts similar to a static body, except it is only temporary and can be awoken.

Default: false

src/body/Body.js:1085 · Usages · Examples

Body.`isStatic`

Boolean

Read only. Use Body.setStatic to set.

A flag that indicates whether a body is considered static. A static body can never change position or angle and is completely fixed.

Default: false

src/body/Body.js:1066 · Usages · Examples

Body.`label`

String

An arbitrary String name to help the user identify and manage bodies.

Default: "Body"

src/body/Body.js:914 · Usages · Examples

Body.`mass`

Number

Read only. Use Body.setMass to set.

A Number that defines the mass of the body.

Density will also be updated when set.

src/body/Body.js:1130 · Usages · Examples

Body.`motion`

Number

Read only. Calculated during engine update only when sleeping is enabled.

A Number that loosely measures the amount of movement a body currently has.

Derived from body.speed^2 + body.angularSpeed^2. See Sleeping.update.

Default: 0

src/body/Body.js:1096 · Usages · Examples

Body.`parent`

Body

Read only. Updated by Body.setParts.

A reference to the body that this is a part of. See body.parts. This is a self reference if the body is not a part of another body.

src/body/Body.js:944 · Usages · Examples

Body.`parts`

Body[]

Read only. Use Body.setParts to set.

An array of bodies that make up this body. The first body in the array must always be a self reference to the current body instance. All bodies in the parts array together form a single rigid compound body. Parts are allowed to overlap, have gaps or holes or even form concave bodies. Parts themselves should never be added to a World, only the parent body should be. Use Body.setParts when setting parts to ensure correct updates of all properties.

src/body/Body.js:922 · Usages · Examples

Body.`plugin`

An object reserved for storing plugin-specific properties.

src/body/Body.js:937 · Usages · Examples

Body.`position`

Vector

Read only. Use Body.setPosition to set.

A Vector that specifies the current world-space position of the body.

Default: { x: 0, y: 0 }

src/body/Body.js:985 · Usages · Examples

Body.`render`

Object

An Object that defines the rendering properties to be consumed by the module Matter.Render.

src/body/Body.js:1313 · Usages · Examples

Body.`render.fillStyle`

String

A String that defines the fill style to use when rendering the body (if a sprite is not defined). It is the same as when using a canvas, so it accepts CSS style property values.

Default: a random colour

src/body/Body.js:1391 · Usages · Examples

Body.`render.lineWidth`

Number

A Number that defines the line width to use when rendering the body outline (if a sprite is not defined). A value of 0 means no outline will be rendered.

Default: 0

src/body/Body.js:1382 · Usages · Examples

Body.`render.opacity`

Number

Sets the opacity to use when rendering.

Default: 1

src/body/Body.js:1328 · Usages · Examples

Body.`render.sprite`

Object

An Object that defines the sprite properties to use when rendering, if any.

src/body/Body.js:1336 · Usages · Examples

Body.`render.sprite.texture`

String

An String that defines the path to the image to use as the sprite texture, if any.

src/body/Body.js:1343 · Usages · Examples

Body.`render.sprite.xOffset`

Number

A Number that defines the offset in the x-axis for the sprite (normalised by texture width).

Default: 0

src/body/Body.js:1366 · Usages · Examples

Body.`render.sprite.xScale`

Number

A Number that defines the scaling in the x-axis for the sprite, if any.

Default: 1

src/body/Body.js:1350 · Usages · Examples

Body.`render.sprite.yOffset`

Number

A Number that defines the offset in the y-axis for the sprite (normalised by texture height).

Default: 0

src/body/Body.js:1374 · Usages · Examples

Body.`render.sprite.yScale`

Number

A Number that defines the scaling in the y-axis for the sprite, if any.

Default: 1

src/body/Body.js:1358 · Usages · Examples

Body.`render.strokeStyle`

String

A String that defines the stroke style to use when rendering the body outline (if a sprite is not defined). It is the same as when using a canvas, so it accepts CSS style property values.

Default: a random colour

src/body/Body.js:1400 · Usages · Examples

Body.`render.visible`

Boolean

A flag that indicates if the body should be rendered.

Default: true

src/body/Body.js:1320 · Usages · Examples

Body.`restitution`

Number

A Number that defines the restitution (elasticity) of the body. The value is always positive and is in the range (0, 1). A value of 0 means collisions may be perfectly inelastic and no bouncing may occur. A value of 0.8 means the body may bounce back with approximately 80% of its kinetic energy. Note that collision response is based on pairs of bodies, and that restitution values are combined with the following formula:

Math.max(bodyA.restitution, bodyB.restitution)

Default: 0

src/body/Body.js:1174 · Usages · Examples

Body.`sleepThreshold`

Number

A Number that defines the length of time during which this body must have near-zero velocity before it is set as sleeping by the Matter.Sleeping module (if sleeping is enabled by the engine).

Default: 60

src/body/Body.js:1109 · Usages · Examples

Body.`slop`

Number

A Number that specifies a thin boundary around the body where it is allowed to slightly sink into other bodies.

This is required for proper collision response, including friction and restitution effects.

The default should generally suffice in most cases. You may need to decrease this value for very small bodies that are nearing the default value in scale.

Default: 0.05

src/body/Body.js:1281 · Usages · Examples

Body.`speed`

Number

Read only. Use Body.setSpeed to set.

See Body.getSpeed for details.

Equivalent to the magnitude of body.velocity (always positive).

Default: 0

src/body/Body.js:1016 · Usages · Examples

Body.`timeScale`

Number

A Number that specifies per-body time scaling.

Default: 1

src/body/Body.js:1293 · Usages · Examples

Body.`torque`

Number

A Number that accumulates the total torque (turning force) applied to the body for a single update. See also Body.applyForce. Torque is zeroed after every Engine.update, so constant torques should be applied for every update they are needed.

Torques result in angular acceleration on every update, which depends on body inertia and the engine update delta.

Default: 0

src/body/Body.js:1005 · Usages · Examples

Body.`type`

String

Read only. Set by Body.create.

A String denoting the type of object.

Default: "body"

src/body/Body.js:903 · Usages · Examples

Body.`velocity`

Vector

Read only. Use Body.setVelocity to set.

See Body.getVelocity for details.

Equivalent to the magnitude of body.angularVelocity (always positive).

Default: { x: 0, y: 0 }

src/body/Body.js:1029 · Usages · Examples

Body.`vertices`

Vector[]

Read only. Use Body.setVertices or Body.setParts to set. See also Bodies.fromVertices.

An array of Vector objects that specify the convex hull of the rigid body. These should be provided about the origin (0, 0). E.g.

[{ x: 0, y: 0 }, { x: 25, y: 50 }, { x: 50, y: 0 }]

Vertices must always be convex, in clockwise order and must not contain any duplicate points.

Concave vertices should be decomposed into convex parts, see Bodies.fromVertices and Body.setParts.

When set the vertices are translated such that body.position is at the centre of mass. Many other body properties are automatically calculated from these vertices when set including density, area and inertia.

The module Matter.Vertices contains useful methods for working with vertices.

src/body/Body.js:963 · Usages · Examples

Events

The following events are emitted by objects created by Matter.Body.create and received by objects that have subscribed using Matter.Events.on.

Events.on(Body, "`sleepEnd`", callback)

Fired when a body ends sleeping (where this is the body).

Callback Parameters

event Object

An event object
- source
  
  The source object of the event
- name
  
  The name of the event

src/body/Body.js:880 · Usages · Examples

Events.on(Body, "`sleepStart`", callback)

Fired when a body starts sleeping (where this is the body).

Callback Parameters

event Object

An event object
- source
  
  The source object of the event
- name
  
  The name of the event

src/body/Body.js:870 · Usages · Examples

Methods

Matter.Body._initProperties

Parameters

Matter.Body._totalProperties

Parameters

Returns

Matter.Body.applyForce

Parameters

Matter.Body.create

Parameters

Returns

Matter.Body.getAngularSpeed

Parameters

Returns

Matter.Body.getAngularVelocity

Parameters

Returns

Matter.Body.getSpeed

Parameters

Returns

Matter.Body.getVelocity

Parameters

Returns

Matter.Body.nextCategory

Returns

Matter.Body.nextGroup

Parameters

Returns

Matter.Body.rotate

Parameters

Matter.Body.scale

Parameters

Matter.Body.set

Parameters

Matter.Body.setAngle

Parameters

Matter.Body.setAngularSpeed

Parameters

Matter.Body.setAngularVelocity

Parameters

Matter.Body.setCentre

Parameters

Matter.Body.setDensity

Parameters

Matter.Body.setInertia

Parameters

Matter.Body.setMass

Parameters

Matter.Body.setParts

Parameters

Matter.Body.setPosition

Parameters

Matter.Body.setSpeed

Parameters

Matter.Body.setStatic

Parameters

Matter.Body.setVelocity

Parameters

Matter.Body.setVertices

Parameters

Matter.Body.translate

Parameters

Matter.Body.update

Parameters

Matter.Body.updateVelocities

Parameters

Properties / Options

Body.angle

Body.angularSpeed

Body.angularVelocity

Body.area

Body.axes

Body.bounds

Body.collisionFilter

Body.collisionFilter.category

Body.collisionFilter.group

Body.collisionFilter.mask

Body.deltaTime

Body.density

Body.force

Body.`angle`

Body.`angularSpeed`

Body.`angularVelocity`

Body.`area`

Body.`axes`

Body.`bounds`

Body.`collisionFilter`

Body.`collisionFilter.category`

Body.`collisionFilter.group`

Body.`collisionFilter.mask`

Body.`deltaTime`

Body.`density`

Body.`force`

Body.`friction`

Body.`frictionAir`

Body.`frictionStatic`

Body.`id`

Body.`inertia`

Body.`inverseInertia`

Body.`inverseMass`

Body.`isSensor`

Body.`isSleeping`

Body.`isStatic`

Body.`label`

Body.`mass`

Body.`motion`

Body.`parent`

Body.`parts`

Body.`plugin`

Body.`position`

Body.`render`

Body.`render.fillStyle`

Body.`render.lineWidth`

Body.`render.opacity`

Body.`render.sprite`

Body.`render.sprite.texture`

Body.`render.sprite.xOffset`

Body.`render.sprite.xScale`

Body.`render.sprite.yOffset`

Body.`render.sprite.yScale`

Body.`render.strokeStyle`

Body.`render.visible`

Body.`restitution`

Body.`sleepThreshold`

Body.`slop`

Body.`speed`

Body.`timeScale`

Body.`torque`

Body.`type`

Body.`velocity`

Body.`vertices`

Events.on(Body, "`sleepEnd`", callback)

Events.on(Body, "`sleepStart`", callback)