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name: NoCollisionConstraint
type: class
memory_category: BaseParts
summary: |
  An instance used to prevent collisions between two specific parts.
description: |
  The **NoCollisionConstraint** prevents collisions between two specific parts,
  but those parts may still register collisions with the rest of the world.
  Compared to
  [collision groups](../../../workspace/collisions.md#collision-filtering), it
  provides a direct way to disable specific collisions, such as the wheel of a
  car scraping against the car's body.

  The most common way to create this constraint is by selecting
  **No Collision** through Studio's **Create** menu in the toolbar's
  **Model** tab.

  Unlike most constraints, `Class.NoCollisionConstraint` does not utilize any
  `Class.Attachment|Attachments`. Note that the tool acts differently based on
  how many parts are selected when the tool is activated:

  <table>
  <thead>
    <tr>
      <td>Option</td>
      <td>Tool Behavior</td>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>No parts selected</td>
      <td>The next two parts that are clicked will be linked together. If the same part is clicked twice, no link will be created.</td>
    </tr>
    <tr>
      <td>One part selected</td>
      <td>The next part that is clicked will be linked to the selected part.</td>
    </tr>
    <tr>
      <td>Two parts selected</td>
      <td>Both selected parts will be linked together.</td>
    </tr>
  </tbody>
  </table>
code_samples: []
inherits:
  - Instance
descendants: []
tags: []
deprecation_message: ''
properties:
  - name: NoCollisionConstraint.Enabled
    summary: |
      Determines whether the two linked `Class.BasePart|BaseParts` will collide
      with each other.
    description: |
      This property determines whether the two linked parts,
      `Class.NoCollisionConstraint.Part0|Part0` and
      `Class.NoCollisionConstraint.Part1|Part1`, will collide with each other.
    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: NoCollisionConstraint.Part0
    summary: |
      The second `Class.BasePart` that the constraint connects.
    description: |
      The second `Class.BasePart` that the constraint connects.
    code_samples: []
    type: BasePart
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Parts
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
  - name: NoCollisionConstraint.Part1
    summary: |
      The first `Class.BasePart` that the constraint connects.
    description: |
      The first `Class.BasePart` that the constraint connects.
    code_samples: []
    type: BasePart
    tags: []
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Parts
    serialization:
      can_load: true
      can_save: true
    capabilities:
      - Physics
methods: []
events: []
callbacks: []