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name: HingeConstraint
type: class
memory_category: BaseParts
summary: |
  Constrains its attachments to rotate about a single axis.
description: |
  A **HingeConstraint** allows two `Class.Attachment|Attachments` to rotate
  about one axis, constraining the two `Class.Attachment|Attachments` so that
  they both occupy the same position and that their **X** axes point in the same
  direction.

  Note that if this constraint attaches one part (**A**) to another part (**B**)
  that is anchored or connected to an anchored part (**Z**), part **A** will not
  be locally simulated when interacting with a player.

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

  #### Angular Power

  Hinges can be configured to actuate rotation. If a hinge's
  `Class.HingeConstraint.ActuatorType|ActuatorType` is set to
  `Enum.ActuatorType|Motor`, it attempts to rotate the attachments with the goal
  of reaching its `Class.HingeConstraint.AngularVelocity|AngularVelocity`. You
  can further control this rotation through both
  `Class.HingeConstraint.MotorMaxAcceleration|MotorMaxAcceleration` and
  `Class.HingeConstraint.MotorMaxTorque|MotorMaxTorque`. If a hinge's
  `Class.HingeConstraint.ActuatorType|ActuatorType` is set to
  `Enum.ActuatorType|Servo`, it attempts to rotate to an angle specified by
  `Class.HingeConstraint.TargetAngle|TargetAngle`. This rotation is controlled
  by both `Class.HingeConstraint.AngularSpeed|AngularSpeed` and
  `Class.HingeConstraint.ServoMaxTorque|ServoMaxTorque`.

  #### Limits

  You can set limits to restrict the rotation of a hinge, useful for mechanisms
  like doors which should only swing open or closed within a set range. Enabling
  the `Class.HingeConstraint.LimitsEnabled|LimitsEnabled` property exposes the
  `Class.HingeConstraint.LowerAngle|LowerAngle` and
  `Class.HingeConstraint.UpperAngle|UpperAngle` limits, as well as
  `Class.HingeConstraint.Restitution|Restitution` which defines the elasticity
  of the attachments when they reach either limit.
code_samples: []
inherits:
  - Constraint
descendants: []
tags: []
deprecation_message: ''
properties:
  - name: HingeConstraint.ActuatorType
    summary: |
      Sets whether the rotation of the `Class.HingeConstraint` is actuated and,
      if so, what kind of actuation it uses.
    description: |
      Sets whether the rotation of the `Class.HingeConstraint` is actuated and,
      if so, what kind of actuation.

      - If `Class.HingeConstraint.ActuatorType|ActuatorType` is set to
        `Enum.ActuatorType|Motor`, the hinge will attempt to rotate the
        attachments with the goal of reaching
        `Class.HingeConstraint.AngularVelocity|AngularVelocity`. This rotation
        is limited by both
        `Class.HingeConstraint.MotorMaxAcceleration|MotorMaxAcceleration` and
        `Class.HingeConstraint.MotorMaxTorque|MotorMaxTorque`.
      - If `Class.HingeConstraint.ActuatorType|ActuatorType` is set to
        `Enum.ActuatorType|Servo`, the hinge will attempt to rotate to an angle
        specified by `Class.HingeConstraint.TargetAngle|TargetAngle`. This
        rotation is limited by both
        `Class.HingeConstraint.AngularSpeed|AngularSpeed` and
        `Class.HingeConstraint.ServoMaxTorque|ServoMaxTorque`.

      Note that both actuated and free spinning rotation can be limited by
      setting `Class.HingeConstraint.LimitsEnabled|LimitsEnabled` to true.
    code_samples: []
    type: ActuatorType
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Hinge
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: HingeConstraint.AngularResponsiveness
    summary: |
      Specifies the sharpness of the servo motor in reaching the
      `Class.HingeConstraint.TargetAngle|TargetAngle`.
    description: |
      This property specifies the sharpness of the servo motor in reaching the
      `Class.HingeConstraint.TargetAngle|TargetAngle`, when
      `Class.HingeConstraint.ActuatorType|ActuatorType` is set to
      `Enum.ActuatorType|Servo`. Larger values correspond to a faster response
      and smaller values results in more damping and a slower response.
    code_samples: []
    type: float
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Servo
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: HingeConstraint.AngularSpeed
    summary: |
      The desired angular speed a `Class.HingeConstraint` with
      `Class.HingeConstraint.ActuatorType|ActuatorType` set to
      `Enum.ActuatorType|Servo` will attempt to maintain while rotating towards
      its `Class.HingeConstraint.TargetAngle|TargetAngle`. Measured in
      radians/second.
    description: |
      The desired angular speed a `Class.HingeConstraint` with
      `Class.HingeConstraint.ActuatorType|ActuatorType` set to
      `Enum.ActuatorType|Servo` will attempt to maintain while rotating towards
      its `Class.HingeConstraint.TargetAngle|TargetAngle`. Measured in
      radians/second.
    code_samples: []
    type: float
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Servo
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: HingeConstraint.AngularVelocity
    summary: |
      The angular velocity a `Class.HingeConstraint` with
      `Class.HingeConstraint.ActuatorType|ActuatorType` set to
      `Enum.ActuatorType|Motor` will attempt to achieve. Measured in
      radians/second.
    description: |
      The angular velocity a `Class.HingeConstraint` with
      `Class.HingeConstraint.ActuatorType|ActuatorType` set to
      `Enum.ActuatorType|Motor` will attempt to achieve. Measured in
      radians/second.
    code_samples: []
    type: float
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Motor
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: HingeConstraint.CurrentAngle
    summary: |
      The current angle of the `Class.HingeConstraint`.
    description: |
      The current angle of the `Class.HingeConstraint`. This angle is calculated
      by measuring the angle separation of the **Y** axes of the
      `Class.Attachment|Attachments`.
    code_samples: []
    type: float
    tags:
      - ReadOnly
      - NotReplicated
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Derived
    serialization:
      can_load: false
      can_save: true
    capabilities:
      - Physics
  - name: HingeConstraint.LimitsEnabled
    summary: |
      Sets whether the `Class.HingeConstraint` will limit the range of rotation.
    description: |
      Sets whether the `Class.HingeConstraint` will limit the range of rotation.
      If enabled, the constraint will only allow the
      `Class.HingeConstraint.CurrentAngle|CurrentAngle` to be between
      `Class.HingeConstraint.LowerAngle|LowerAngle` and
      `Class.HingeConstraint.UpperAngle|UpperAngle`. If the `Class.Attachment`
      reach the end of the limited range of rotation then they will stop
      rotating. If `Class.HingeConstraint.Restitution|Restitution` is greater
      than 0 then the attachments will bounce when they hit the ends of the
      limited range.
    code_samples: []
    type: boolean
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Hinge
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: HingeConstraint.LowerAngle
    summary: |
      The minimum rotation angle the `Class.HingeConstraint` will allow if
      `Class.HingeConstraint.LimitsEnabled|LimitsEnabled` is true.
    description: |
      The minimum rotation angle the `Class.HingeConstraint` will allow if
      `Class.HingeConstraint.LimitsEnabled|LimitsEnabled` is true. Measured in
      degrees.
    code_samples: []
    type: float
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Limits
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: HingeConstraint.MotorMaxAcceleration
    summary: |
      The maximum angular acceleration a `Class.HingeConstraint` with
      `Class.HingeConstraint.ActuatorType|ActuatorType` set to
      `Enum.ActuatorType|Motor` can apply to achieve its
      `Class.HingeConstraint.AngularVelocity|AngularVelocity`. Measured in
      radians/second².
    description: |
      The maximum angular acceleration a `Class.HingeConstraint` with
      `Class.HingeConstraint.ActuatorType|ActuatorType` set to
      `Enum.ActuatorType|Motor` can apply to achieve its
      `Class.HingeConstraint.AngularVelocity|AngularVelocity`. Measured in
      radians/second².
    code_samples: []
    type: float
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Motor
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: HingeConstraint.MotorMaxTorque
    summary: |
      The maximum torque a `Class.HingeConstraint` with
      `Class.HingeConstraint.ActuatorType|ActuatorType` set to
      `Enum.ActuatorType|Motor` can apply when trying to reach its desired
      `Class.HingeConstraint.AngularVelocity|AngularVelocity`.
    description: |
      The maximum torque a `Class.HingeConstraint` with
      `Class.HingeConstraint.ActuatorType|ActuatorType` set to
      `Enum.ActuatorType|Motor` can apply when trying to reach its desired
      `Class.HingeConstraint.AngularVelocity|AngularVelocity`.
    code_samples: []
    type: float
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Motor
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: HingeConstraint.Radius
    summary: |
      The visualized radius of the `Class.HingeConstraint`.
    description: |
      The visualized radius of the `Class.HingeConstraint`.
    code_samples: []
    type: float
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Appearance
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: HingeConstraint.Restitution
    summary: |
      How elastic `Class.Attachment` connected by a `Class.HingeConstraint` will
      be when they reach the end of the range when
      `Class.HingeConstraint.LimitsEnabled|LimitsEnabled` is true. Constrained
      between 0 and 1.
    description: |
      How elastic `Class.Attachment` connected by a `Class.HingeConstraint` will
      be when they reach the end of the range when
      `Class.HingeConstraint.LimitsEnabled|LimitsEnabled` is true. Constrained
      between 0 and 1.
    code_samples: []
    type: float
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Limits
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: HingeConstraint.ServoMaxTorque
    summary: |
      The maximum torque a `Class.HingeConstraint` with
      `Class.HingeConstraint.ActuatorType|ActuatorType` set to
      `Enum.ActuatorType|Servo` can apply when trying to reach its desired
      `Class.HingeConstraint.TargetAngle|TargetAngle`.
    description: |
      The maximum torque a `Class.HingeConstraint` with
      `Class.HingeConstraint.ActuatorType|ActuatorType` set to
      `Enum.ActuatorType|Servo` can apply when trying to reach its desired
      `Class.HingeConstraint.TargetAngle|TargetAngle`.
    code_samples: []
    type: float
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Servo
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: HingeConstraint.SoftlockServoUponReachingTarget
    summary: ''
    description: ''
    code_samples: []
    type: boolean
    tags:
      - Deprecated
    deprecation_message: |
      This property should not be used in new work.
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Servo
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: HingeConstraint.TargetAngle
    summary: |
      The target angle a `Class.HingeConstraint` will attempt to rotate to if
      its `Class.HingeConstraint.ActuatorType|ActuatorType` is set to
      `Enum.ActuatorType|Servo`. Measured in degrees.
    description: |
      The target angle a `Class.HingeConstraint` will attempt to rotate to if
      its `Class.HingeConstraint.ActuatorType|ActuatorType` is set to
      `Enum.ActuatorType|Servo`. Measured in degrees.
    code_samples: []
    type: float
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Servo
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: HingeConstraint.UpperAngle
    summary: |
      The maximum rotation angle the `Class.HingeConstraint` will allow if
      `Class.HingeConstraint.LimitsEnabled|LimitsEnabled` is true.
    description: |
      The maximum rotation angle the `Class.HingeConstraint` will allow if
      `Class.HingeConstraint.LimitsEnabled|LimitsEnabled` is true. Measured in
      degrees.
    code_samples: []
    type: float
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Limits
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
methods: []
events: []
callbacks: []