The `AlignPosition` constraint applies force to move two attachments together,
or to move one attachment to a goal position. As indicated by the name, it
only affects the **position** of the attachments, not their orientation (to
align attachments by **orientation**, see `Class.AlignOrientation`).

When configuring this constraint, it may be helpful to study
[Roblox Units](/physics/units) to understand how Roblox units
compare to metric units.

#### Force Location

By default, force is applied to the parent of
`Class.Constraint.Attachment0|Attachment0` at that attachment's location,
meaning that if the parent's center of mass is not aligned with the direction
of the force, torque will be applied as well as force. Alternatively, force
can be applied to the parents' center of mass by toggling on
`Class.AlignPosition.ApplyAtCenterOfMass|ApplyAtCenterOfMass`.

#### Reactionary Force

By default, the constraint only applies force to
`Class.Constraint.Attachment0|Attachment0` while
`Class.Constraint.Attachment1|Attachment1` remains unaffected. If desired,
force can be applied to both attachments in **equal and opposite directions**
by enabling `Class.AlignPosition.ReactionForceEnabled|ReactionForceEnabled`.

#### Force Limits

You can configure this constraint to apply the maximum force that constraints
allow through the `Class.AlignPosition.RigidityEnabled|RigidityEnabled`
property. When `true`, the physics solver reacts as quickly as possible to
complete the alignment. When `false`, the force applied by the constraint is
limited based on `Class.AlignPosition.ForceLimitMode|ForceLimitMode`,
`Class.AlignPosition.MaxVelocity|MaxVelocity`, and
`Class.AlignPosition.Responsiveness|Responsiveness`. See
`Class.AlignPosition.ForceLimitMode|ForceLimitMode` for further details.

#### Attachment Mode

This constraint can use either **one** or **two** attachments in calculating
its goal. See `Class.AlignPosition.Mode|Mode` for details.


AlignPosition

When `false` (default), force is applied to the parent of
`Class.Constraint.Attachment0|Attachment0` at that attachment's location,
meaning that if the parent's center of mass is not aligned with the
direction of the force, torque will be applied as well as force. When
`true`, force is applied at the parents' center of mass.


AlignPosition.ApplyAtCenterOfMass

Whether force is applied to the parent of
`Class.Constraint.Attachment0|Attachment0` at that attachment's location,
or at the parents' center of mass.


Determines how the constraint force will be limited when
`Class.AlignPosition.RigidityEnabled|RigidityEnabled` is `false`. When set
to `Enum.ForceLimitMode|Magnitude`, the constraint force will be limited
such that the magnitude is less than
`Class.AlignPosition.MaxForce|MaxForce`. When set to
`Enum.ForceLimitMode|PerAxis`, the constraint force along each axis will
be limited by `Class.AlignPosition.MaxAxesForce|MaxAxesForce`. The axes
along which the force will be limited are based on the
`Class.AlignPosition.ForceRelativeTo|ForceRelativeTo` property.


AlignPosition.ForceLimitMode

Determines how the constraint force will be limited. Only used if
`Class.AlignPosition.RigidityEnabled|RigidityEnabled` is `false`.


Determines the axes that the constraint uses to limit the force. Only
applies when `Class.AlignPosition.RigidityEnabled|RigidityEnabled` is
`false` and `Class.AlignPosition.ForceLimitMode` is
`Enum.ForceLimitMode|PerAxis`. When set to
`Enum.ActuatorRelativeTo|World`, the constraint force is computed in the
world reference frame and the force limits specified in
`Class.AlignPosition.MaxAxesForce|MaxAxesForce` refer to the axes of the
world coordinate system. When set to `Enum.ActuatorRelativeTo|Attachment0`
or `Enum.ActuatorRelativeTo|Attachment1`, the force limits specified in
`Class.AlignPosition.MaxAxesForce|MaxAxesForce` refer to the axes of the
specified attachment coordinate system.


AlignPosition.ForceRelativeTo

Determines the axes that the constraint uses to limit the force. Only
applies when `Class.AlignPosition.RigidityEnabled|RigidityEnabled` is
`false` and `Class.AlignPosition.ForceLimitMode` is
`Enum.ForceLimitMode|PerAxis`. .


Maximum force along each axis that the constraint can apply to achieve its
goal. Only used if `Class.AlignPosition.RigidityEnabled|RigidityEnabled`
is `false` and `Class.AlignPosition.ForceLimitMode|ForceLimitMode` is
`Enum.ForceLimitMode|PerAxis`. The axes used to apply to the limit are
specified using the `Class.AlignPosition.ForceRelativeTo|ForceRelativeTo`
property.


AlignPosition.MaxAxesForce

Maximum force along each axis that the constraint can apply to achieve its
goal.


Maximum force magnitude the constraint can apply to achieve its goal. Only
used if `Class.AlignPosition.RigidityEnabled|RigidityEnabled` is `false`
and `Class.AlignPosition.ForceLimitMode|ForceLimitMode` is
`Enum.ForceLimitMode|Magnitude`.

Note that `Class.AlignPosition.MaxForce|MaxForce`, as well as
`Class.AlignPosition.MaxVelocity|MaxVelocity`, are **caps** to the force
and velocity respectively. The actual scale is determined by
`Class.AlignPosition.Responsiveness|Responsiveness`.


AlignPosition.MaxForce

Maximum force magnitude the constraint can apply to achieve its goal.


Maximum speed the attachments can move when converging. Only used if
`Class.AlignPosition.RigidityEnabled|RigidityEnabled` is `false`.

Note that `Class.AlignPosition.MaxVelocity|MaxVelocity`, as well as
`Class.AlignPosition.MaxForce|MaxForce`, are **caps** to the velocity and
force respectively. The actual scale is determined by
`Class.AlignPosition.Responsiveness|Responsiveness`.


AlignPosition.MaxVelocity

Maximum speed the attachments can move when converging.


Whether the constraint uses **one** or **two** attachments in calculating
its goal. By default, this is `Enum.PositionAlignmentMode|TwoAttachment`,
meaning that the constraint disregards
`Class.AlignPosition.Position|Position` and attempts to move
`Class.Constraint.Attachment0|Attachment0` to the position of
`Class.Constraint.Attachment1|Attachment1`.

If set to `Enum.PositionAlignmentMode|OneAttachment`, the constraint
disregards `Class.Constraint.Attachment1|Attachment1` and attempts to move
`Class.Constraint.Attachment0|Attachment0` to
`Class.AlignPosition.Position|Position`.


AlignPosition.Mode

Whether the constraint uses one or two attachments in calculating its
goal.


The position to which the constraint should move its
`Class.Constraint.Attachment0|Attachment0`. Only used if
`Class.AlignPosition.Mode|Mode` is set to
`Enum.PositionAlignmentMode|OneAttachment`, in which case
`Class.Constraint.Attachment1|Attachment1` is disregarded.


AlignPosition.Position

The position to which the constraint should move its
`Class.Constraint.Attachment0|Attachment0`.


If `false` (default), the constraint only applies force to
`Class.Constraint.Attachment0|Attachment0` while
`Class.Constraint.Attachment1|Attachment1` remains unaffected. If `true`,
the constraint applies force to both attachments in **equal and opposite
directions**.


AlignPosition.ReactionForceEnabled

Whether the constraint applies force only to
`Class.Constraint.Attachment0|Attachment0`, or to both attachments in
equal and opposite directions.


Controls how quickly the constraint reaches its goal. Higher values cause
the attachment(s) to align more rapidly. Value can be between 5 and 200.


AlignPosition.Responsiveness

Controls how quickly the constraint reaches its goal. Higher values cause
the attachment(s) to align more rapidly.


Whether force is dependent on other properties, or if the physics solver
reacts as quickly as possible to complete the alignment. If `false`
(default), the force is determined by
`Class.AlignPosition.MaxForce|MaxForce`,
`Class.AlignPosition.MaxVelocity|MaxVelocity`, and
`Class.AlignPosition.Responsiveness|Responsiveness`. If `true`, the
physics solver reacts as quickly as possible to complete the alignment.


AlignPosition.RigidityEnabled

Whether force is dependent on other properties, or if the physics solver
reacts as quickly as possible to complete the alignment.


Constraint which applies force to move two attachments together, or to move
one attachment to a goal position.


The base class for constraint-based objects. See
[mover constraints](/physics/mover-constraints) and
[mechanical constraints](/physics/mechanical-constraints) for more
details.


Constraint:GetDebugAppliedForce

bodyId

Constraint:GetDebugAppliedTorque

Constraint

This property is `true` if the constraint and both of its parts are in the
`Class.Workspace` and the constraint's `Class.Constraint.Enabled` property
is `true`.


Constraint.Active

Indicates if the constraint is currently active in the world.


The `Class.Attachment` that is connected to `Class.Constraint.Attachment1`


Constraint.Attachment0

The `Class.Attachment` that is connected to
`Class.Constraint.Attachment1`.


The `Class.Attachment` that is connected to `Class.Constraint.Attachment0`


Constraint.Attachment1

The `Class.Attachment` that is connected to
`Class.Constraint.Attachment0`.


Constraint.Color

Toggles whether or not the constraint is enabled.


Constraint.Enabled

Constraint.Visible

The base class for constraint-based objects.


/reference/engine/classes/AlignPosition.yaml

The CFrame value in which the body mover constraint is expressed.

Enum

Enum.ActuatorRelativeTo

Defines a point and orientation relative to a parent `Class.BasePart`, `Class.Bone`, or another `Class.Attachment`.

Class

Attachment

A data type that provides a predefined list of named colors.

Data Type

BrickColor

The **ForceLimitMode** enum determines how the maximum force for a constraint is specified and how that limit is enforced by the constraint.

Enum.ForceLimitMode

The PositionAlignmentMode Enum is used to select the number of `Class.Attachment|Attachments` used in an alignment.

Enum.PositionAlignmentMode

An object that runs connected functions upon a specific occurrence.

RBXScriptSignal

Represents a 3D value with a direction and magnitude.

Vector3

Data type having a value of either true or false.

Luau

boolean

A double-precision floating-point number.

number

Overview

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This method is asynchronous and returns an `Operation`, which represents the current state of the operation. It contains an endpoint path that you can poll to obtain the real response and applicable metadata. See the [documentation]({longRunningOperationsLink}) on long-running operations for more information.
            
The following sections describe the response and metadata objects that are provided when an operation completes.

Beta endpoints are ready for public use. Breaking changes are possible but rare.

This field may be set when creating a resource, but may not be modified by subsequent requests.

These fields may be set when creating a resource, but may not be modified by subsequent requests.

This field may be provided in requests, but will never be included in responses.

Per API Key: {maxInPeriod} requests every {periodInSeconds} seconds per IP Address

This field may be set on responses, but will be ignored in requests.

Note: Rate limits can be lower during high-traffic periods. Certain endpoints have additional rate limits. [Learn more about rate limits]({link}).

{limit} requests per day across all API keys for a user or group

{limit} requests per hour across all API keys for a user or group

{limit} requests per minute across all API keys for a user or group

{limit} requests per second across all API keys for a user or group

{limit} requests per minute per API key owner

{limit} request(s) per second per API key owner

The following API key permissions are required to call this endpoint. For more
information on generating proper keys, see [Manage API keys]({apiKeyReferenceDocLink}).

The following endpoints are available at paths relative to the base URL.

This string is formatted as a [FieldMask](/cloud/reference/types#fieldmask).

A JSON value can be `null`, `boolean`, `string`, `number`, `array`, or `object`.

The following scopes are required for your OAuth 2.0 application to use this endpoint. For more information on how to register an OAuth 2.0 application, see [App registration and review]({oauth2ReferenceDocLink}).

The following objects describe payloads that are accepted or returned. See each individual endpoint for more information on when these objects are used.

This string is formatted as a [Timestamp](/cloud/reference/types#timestamp).

The following scopes are required for your OAuth 2.0 application to use this endpoint. For more information on how to register an OAuth 2.0 application, see [App Registration and Review]({oauth2ReferenceDocLink}).

This allows viewing information about your assets.

This allows uploading and updating assets to Roblox.

This allows granting asset permissions to any subjects (including groups and experiences) and assets your account has access to.

Grants the ability to update badges owned by the user.

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Grants access to mange your badges and spend robux.

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This grants the ability to publish messages on behalf of users.

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Grants access to read about your subscription products.

Grants the ability to read place information.

Grants the ability to edit place information.

This operation grants access to publish new versions of experiences to Roblox.

Grants the ability to read experience information.

Grants the ability to edit experience information.

Allows you to view user restrictions in the experience.

Allows you to edit user restrictions in the experience.

Grants the ability to read user's premium and verified status.

This allows you to view a user's social accounts.

This enables Single Sign-On functionality.

This grants access to read your profile information.

Default Value: {defaultValueStart}{defaultValueEnd}

An array is an ordered list of values. Arrays are useful for storing collections of data.

A set of key-value pairs, where the keys can be any number, string, or object.

This function returns immediately if possible, but can yield the thread that called it until it can return a value.

{nameStart}name{nameEnd} is no longer supported or maintained by Roblox.

This math operation is no longer supported or maintained by Roblox.

This member doesn’t appear in the object browser and is not intended for widespread use.

This member is only accessible only through the command bar. Attempting to access this member from scripts causes an error.

This function can’t pause the Lua thread that called it.

Attempting to access this member in scripts causes an error. You might be able to access this member from Roblox Studio's property window.

This member doesn’t appear in Roblox Studio’s Object Browser.

You can’t create an instance of this class with the Instance.new constructor.

Roblox does not replicate this member across its server-client boundary.

Lua code can’t access this member. You might be able to change its value from the property window in Roblox Studio.

This member is accessible from OpenCloud Luau execution tasks.

This object’s replication behavior is dependent on the player who owns it.

This member is accessible through the command bar and plugins. Attempting to access this member from scripts causes an error.

This member is read only. Attempting to write to this member causes an error.

This property is read-only and is safe to read in unsynchronized threads. Attempting to write to it causes an error.

This member is accessible only in CoreScripts.

Only Roblox CoreScripts can access this member, and it isn’t usable by Players.

You can read and write to this property safely from multiple threads.

This class is a top-level singleton. Retrieve an instance of this class with the GetService function.

Multiple threads can potentially write to this property, so it’s unsafe to read from unsynchronized threads.

This function pauses the Lua thread that called it until it returns a result. This doesn’t interrupt other scripts.

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AlignPosition

Summary

Properties

Properties

ApplyAtCenterOfMass

ForceLimitMode

ForceRelativeTo

MaxAxesForce

MaxForce

MaxVelocity

Mode

Position

ReactionForceEnabled

Responsiveness

RigidityEnabled