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name: JointInstance
type: class
memory_category: BaseParts
summary: |
  The base class for joints.
description: |
  `JointInstance` is the base class for joints such as `Class.Weld|Welds` and
  `Class.Motor|Motors`.

  `Class.Weld`, `Class.WeldConstraint`, `Class.Motor`, and `Class.Motor6D` all
  combine multiple parts into the same
  [assembly](../../../physics/assemblies.md). Every assembly has a root part
  (`Class.BasePart:GetRootPart()`) and when
  `Class.JointInstance.C0|C0`/`Class.JointInstance.C1|C1` of a
  `Class.JointInstance` is modified, the root part will stay where it was.

  Welds do not have any directionality. You can imagine rigid joints forming a
  tree branching down from the root part. All the parts down the tree from root
  will move, and their welded "children" in this tree will move with them.
code_samples: []
inherits:
  - Instance
descendants:
  - DynamicRotate
  - Glue
  - ManualSurfaceJointInstance
  - Motor
  - Rotate
  - Snap
  - VelocityMotor
  - Weld
tags:
  - NotCreatable
deprecation_message: ''
properties:
  - name: JointInstance.Active
    summary: |
      Determines if the joint is currently active in the world.
    description: |
      This property determines if the joint is currently active in the world.

      If the `Class.JointInstance` is not in `Class.Workspace` or
      `Class.JointsService`, or one of its parts is not in `Class.Workspace`,
      the joint will be inactive.

      Rigid joints like `Class.Weld`, `Class.Snap`, `Class.WeldConstraint`,
      `Class.Motor`, or `Class.Motor6D` may also be disabled due to conflicts
      with other rigid joints, such as joints between the same two parts or
      indirect cycles in the weld graph. Joints disabled this way may be
      re-enabled later when another joint or part is added or removed.
    code_samples: []
    type: boolean
    tags:
      - ReadOnly
      - NotReplicated
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Behavior
    serialization:
      can_load: false
      can_save: false
    capabilities:
      - Physics
  - name: JointInstance.C0
    summary: |
      Determines how the offset point is attached to
      `Class.JointInstance.Part0`.
    description: |
      `C0` is the position aspect of the orientation between two parts in a
      weld. `Class.JointInstance.Part0|Part0` and
      `Class.JointInstance.Part1|Part1` move accordingly to this value, which
      denotes their respective positions.

      When animating a `Class.Motor6D`, it's recommended to tween its
      `Class.Motor6D.Transform|Transform` property instead of `C0`.
    code_samples: []
    type: CFrame
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Data
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: JointInstance.C1
    summary: |
      Subtracted from the `Class.JointInstance.C0|C0` property to create an
      offset point for `Class.JointInstance.Part1|Part1`.
    description: |
      This property is subtracted from the `Class.JointInstance.C0|C0` property
      to create an offset point for `Class.JointInstance.Part1|Part1`.

      When animating a `Class.Motor6D`, it's recommended to tween its
      `Class.Motor6D.Transform|Transform` property instead of `C1`.
    code_samples: []
    type: CFrame
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Data
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: JointInstance.Enabled
    summary: |
      Sets whether the joint is active or not.
    description: |
      This property sets whether the joint is active or not.

      When this property is set to `true` and the joint's
      `Class.JointInstance.Part0|Part0` and `Class.JointInstance.Part1|Part1`
      properties are set, the joint will ensure that its two parts will be
      connected and behave according to joint type.

      See also `Class.JointInstance.Active|Active` which determines if the joint
      is currently active in the world.
    code_samples: []
    type: boolean
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Behavior
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: JointInstance.Part0
    summary: |
      The first `Class.BasePart` that the joint connects.
    description: |
      This property indicates the first `Class.BasePart` that the joint
      connects.
    code_samples: []
    type: BasePart
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Data
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: JointInstance.Part1
    summary: |
      The second `Class.BasePart` that the joint connects.
    description: |
      This property indicates the second `Class.BasePart` that the joint
      connects.
    code_samples: []
    type: BasePart
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Data
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: JointInstance.part1
    summary: ''
    description: ''
    code_samples: []
    type: BasePart
    tags:
      - Hidden
      - NotReplicated
      - Deprecated
    deprecation_message: |
      This deprecated property is a variant of `Class.JointInstance.Part1|Part1`
      which should be used instead.
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Data
    serialization:
      can_load: false
      can_save: false
    capabilities:
      - Physics
methods: []
events: []
callbacks: []