--- name: BodyPosition last_updated: 2026-06-10T23:09:11Z inherits: - BodyMover - Instance - Object type: class memory_category: Instances tags: - Deprecated summary: "Applies a force to maintain a constant position." --- # Class: BodyPosition > Applies a force to maintain a constant position. ## Description The `BodyPosition` object applies a force on an assembly such that it will maintain a constant position in the world. The [Position](/docs/reference/engine/classes/BodyPosition.md) property, not to be confused with [BasePart.Position](/docs/reference/engine/classes/BasePart.md), controls the target world position. This is the translational counterpart to a [BodyGyro](/docs/reference/engine/classes/BodyGyro.md). If you need further control on a force applied to an object, consider using a [BodyForce](/docs/reference/engine/classes/BodyForce.md) or [BodyThrust](/docs/reference/engine/classes/BodyThrust.md) instead. The strength of the force applied by this object is controlled by several factors, namely the distance to the goal position: the force is stronger when farther away from the goal. This is amplified by [P](/docs/reference/engine/classes/BodyPosition.md) (power). The present velocity will also dampen the force applied by this object, and this is amplified by [D](/docs/reference/engine/classes/BodyPosition.md) (dampening). The resulting force is then capped by [MaxForce](/docs/reference/engine/classes/BodyPosition.md). Note the force applied on the assembly to achieve the goal position may vary on a per-axis basis. ## Properties ### Property: BodyPosition.D ```json { "type": "float", "access": "ReadWrite", "security": { "read": "None", "write": "None" }, "serialization": { "can_load": true, "can_save": true }, "thread_safety": "ReadSafe", "category": "Goals", "capabilities": [ "Physics" ] } ``` This property determines how much dampening will be applied to the force used toward reaching the goal [Position](/docs/reference/engine/classes/BodyPosition.md). When the assembly approaches the goal position it needs to decelerate, otherwise it will move past the goal and have to stop and re-accelerate back toward the goal. This is often creates an undesirable "rubber‑banding" effect, avoided by applying dampening. The higher this value is set, the greater the dampening curve becomes, or the slower the assembly will approach the goal position. ### Property: BodyPosition.MaxForce ```json { "type": "Vector3", "access": "ReadWrite", "security": { "read": "None", "write": "None" }, "serialization": { "can_load": true, "can_save": true }, "thread_safety": "ReadSafe", "category": "Goals", "capabilities": [ "Physics" ] } ``` This property determines the limit on the amount of force that may be applied on each axis in reaching the goal [Position](/docs/reference/engine/classes/BodyPosition.md). If an assembly isn't moving, consider increasing this value and also check that it is not [Anchored](/docs/reference/engine/classes/BasePart.md) or attached to any anchored assemblies. ### Property: BodyPosition.P ```json { "type": "float", "access": "ReadWrite", "security": { "read": "None", "write": "None" }, "serialization": { "can_load": true, "can_save": true }, "thread_safety": "ReadSafe", "category": "Goals", "capabilities": [ "Physics" ] } ``` This property determines how much power is used while applying force in order to reach the goal [Position](/docs/reference/engine/classes/BodyPosition.md). The higher this value, the more power will be used and the faster it will be used. The force the [BodyPosition](/docs/reference/engine/classes/BodyPosition.md) exerts increases as the difference between the assembly's current position and the goal position increases. This property is multiplied to this force to either amplify or diminish it. ### Property: BodyPosition.Position ```json { "type": "Vector3", "access": "ReadWrite", "security": { "read": "None", "write": "None" }, "serialization": { "can_load": true, "can_save": true }, "thread_safety": "ReadSafe", "category": "Goals", "capabilities": [ "Physics" ] } ``` This property determines the goal position towards which the [BodyPosition](/docs/reference/engine/classes/BodyPosition.md) will apply force. ### Property: BodyPosition.maxForce ```json { "type": "Vector3", "access": "ReadWrite", "security": { "read": "None", "write": "None" }, "serialization": { "can_load": true, "can_save": false }, "deprecated": true, "thread_safety": "ReadSafe", "category": "Goals", "capabilities": [ "Physics" ] } ``` > **Deprecated:** This property is a deprecated variant of [BodyPosition.MaxForce](/docs/reference/engine/classes/BodyPosition.md) which should be used instead. ### Property: BodyPosition.position ```json { "type": "Vector3", "access": "ReadWrite", "security": { "read": "None", "write": "None" }, "serialization": { "can_load": true, "can_save": false }, "deprecated": true, "thread_safety": "ReadSafe", "category": "Goals", "capabilities": [ "Physics" ] } ``` > **Deprecated:** This is a deprecated variant of [BodyPosition.Position](/docs/reference/engine/classes/BodyPosition.md) which should be used instead. ## Methods ### Method: BodyPosition:GetLastForce **Signature:** `BodyPosition:GetLastForce(): Vector3` This function returns the last force in the object. *Security: None · Thread Safety: Unsafe · Capabilities: Physics* **Returns:** `Vector3` ### Method: BodyPosition:lastForce **Signature:** `BodyPosition:lastForce(): Vector3` > **Deprecated:** This property has been superseded by [BodyPosition:GetLastForce()](/docs/reference/engine/classes/BodyPosition.md) which should be used in new work instead, The lastForce function returns the last force in the object. *Security: None · Thread Safety: Unsafe · Capabilities: Physics* **Returns:** `Vector3` ## Events ### Event: BodyPosition.ReachedTarget **Signature:** `BodyPosition.ReachedTarget()` Fired when the Parent of the BodyPosition reaches the desired [BodyPosition.Position](/docs/reference/engine/classes/BodyPosition.md) (within .1 studs). Once this event fires it will not fire again until [BodyPosition.Position](/docs/reference/engine/classes/BodyPosition.md) is updated. *Security: None · Capabilities: Physics* ## Inherited Members ### From [Instance](/docs/reference/engine/classes/Instance.md) - **Property `Archivable`** (`boolean`): Determines if an Instance and its descendants can be cloned using - **Property `archivable`** (`boolean`): *(deprecated, hidden)* - **Property `Capabilities`** (`SecurityCapabilities`): The set of capabilities allowed to be used for scripts inside this - **Property `Name`** (`string`): A non-unique identifier of the Instance. - **Property `Parent`** (`Instance`): Determines the hierarchical parent of the Instance. - **Property `PredictionMode`** (`PredictionMode`): - **Property `RobloxLocked`** (`boolean`): A deprecated property that used to protect CoreGui objects. *(hidden)* - **Property `Sandboxed`** (`boolean`): When enabled, the instance can only access abilities in its `Capabilities` - **Property `UniqueId`** (`UniqueId`): A unique identifier for the instance. - **Method `AddTag(tag: string): ()`**: Applies a tag to the instance. - **Method `children(): Instances`**: Returns an array of the object's children. *(deprecated)* - **Method `ClearAllChildren(): ()`**: This method destroys all of an instance's children. - **Method `Clone(): Instance`**: Create a copy of an instance and all its descendants, ignoring instances - **Method `clone(): Instance`**: *(deprecated)* - **Method `Destroy(): ()`**: Sets the Instance.Parent property to `nil`, locks the - **Method `destroy(): ()`**: *(deprecated)* - **Method `FindFirstAncestor(name: string): Instance?`**: Returns the first ancestor of the Instance whose - **Method `FindFirstAncestorOfClass(className: string): Instance?`**: Returns the first ancestor of the Instance whose - **Method `FindFirstAncestorWhichIsA(className: string): Instance?`**: Returns the first ancestor of the Instance for whom - **Method `FindFirstChild(name: string, recursive?: boolean): Instance?`**: Returns the first child of the Instance found with the given name. - **Method `findFirstChild(name: string, recursive?: boolean): Instance`**: *(deprecated)* - **Method `FindFirstChildOfClass(className: string): Instance?`**: Returns the first child of the Instance whose - **Method `FindFirstChildWhichIsA(className: string, recursive?: boolean): Instance?`**: Returns the first child of the Instance for whom - **Method `FindFirstDescendant(name: string): Instance?`**: Returns the first descendant found with the given Instance.Name. - **Method `GetActor(): Actor?`**: Returns the Actor associated with the Instance, if any. - **Method `GetAttribute(attribute: string): Variant`**: Returns the value which has been assigned to the given attribute name. - **Method `GetAttributeChangedSignal(attribute: string): RBXScriptSignal`**: Returns an event that fires when the given attribute changes. - **Method `GetAttributes(): Dictionary`**: Returns a dictionary of the instance's attributes. - **Method `GetChildren(): Instances`**: Returns an array containing all of the instance's children. - **Method `getChildren(): Instances`**: *(deprecated)* - **Method `GetDebugId(scopeLength?: int): string`**: Returns a coded string of the debug ID used internally by Roblox. - **Method `GetDescendants(): Instances`**: Returns an array containing all of the descendants of the instance. - **Method `GetFullName(): string`**: Returns a string describing the instance's ancestry. - **Method `GetStyled(name: string, selector: string?): Variant`**: Returns the styled or explicitly modified value of the specified property, - **Method `GetStyledPropertyChangedSignal(property: string): RBXScriptSignal`**: - **Method `GetTags(): Array`**: Gets an array of all tags applied to the instance. - **Method `HasTag(tag: string): boolean`**: Check whether the instance has a given tag. - **Method `IsAncestorOf(descendant: Instance): boolean`**: Returns true if an Instance is an ancestor of the given - **Method `IsDescendantOf(ancestor: Instance): boolean`**: Returns `true` if an Instance is a descendant of the given - **Method `isDescendantOf(ancestor: Instance): boolean`**: *(deprecated)* - **Method `IsPropertyModified(property: string): boolean`**: Returns `true` if the value stored in the specified property is not equal - **Method `QueryDescendants(selector: string): Instances`**: - **Method `Remove(): ()`**: Sets the object's `Parent` to `nil`, and does the same for all its *(deprecated)* - **Method `remove(): ()`**: *(deprecated)* - **Method `RemoveTag(tag: string): ()`**: Removes a tag from the instance. - **Method `ResetPropertyToDefault(property: string): ()`**: Resets a property to its default value. - **Method `SetAttribute(attribute: string, value: Variant): ()`**: Sets the attribute with the given name to the given value. - **Method `WaitForChild(childName: string, timeOut: double): Instance`**: Returns the child of the Instance with the given name. If the - **Event `AncestryChanged`**: Fires when the Instance.Parent property of this object or one of - **Event `AttributeChanged`**: Fires whenever an attribute is changed on the Instance. - **Event `ChildAdded`**: Fires after an object is parented to this Instance. - **Event `childAdded`**: *(deprecated)* - **Event `ChildRemoved`**: Fires after a child is removed from this Instance. - **Event `DescendantAdded`**: Fires after a descendant is added to the Instance. - **Event `DescendantRemoving`**: Fires immediately before a descendant of the Instance is removed. - **Event `Destroying`**: Fires immediately before (or is deferred until after) the instance is - **Event `StyledPropertiesChanged`**: Fires whenever any style property is changed on the instance, including ### From [Object](/docs/reference/engine/classes/Object.md) - **Property `ClassName`** (`string`): A read-only string representing the class this Object belongs to. - **Property `className`** (`string`): *(deprecated)* - **Method `GetPropertyChangedSignal(property: string): RBXScriptSignal`**: Get an event that fires when a given property of the object changes. - **Method `IsA(className: string): boolean`**: Returns true if an object's class matches or inherits from a given class. - **Method `isA(className: string): boolean`**: *(deprecated)* - **Event `Changed`**: Fires immediately after a property of the object changes, with some