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name: PhysicsService
type: class
memory_category: Instances
summary: ''
description: |
  `Class.PhysicsService` primarily contains methods for working with **collision
  groups** which define whether a set of parts may or may not collide with parts
  in other collision groups. You can register a collision group through
  `Class.PhysicsService:RegisterCollisionGroup()|RegisterCollisionGroup()` and
  assign parts to it by setting those parts'
  `Class.BasePart.CollisionGroup|CollisionGroup` property to the **name** of the
  collision group.

  Creating, deleting, and modifying collision relationships between collision
  groups is limited to server-side `Class.Script|Scripts`.

  See
  [Collision Filtering](../../../workspace/collisions.md#collision-filtering)
  for usage details in Studio and within scripts.
code_samples: []
inherits:
  - Instance
descendants: []
tags:
  - NotCreatable
  - Service
deprecation_message: ''
properties: []
methods:
  - name: PhysicsService:CollisionGroupContainsPart
    summary: |
      Returns whether the part is in the collision group.
    description: |
      Returns whether the specified part is in the specified collision group.
      This method will throw a runtime error in the following circumstances:

      - The specified group does not exist.
      - The specified part is not a `Class.BasePart`.
    code_samples: []
    parameters:
      - name: name
        type: string
        default:
        summary: ''
      - name: part
        type: BasePart
        default:
        summary: ''
    returns:
      - type: boolean
        summary: ''
    tags:
      - Deprecated
    deprecation_message: |
      This method has been deprecated. It's recommended that you query a part's
      collision group through its `Class.BasePart.CollisionGroup|CollisionGroup`
      property.
    security: None
    thread_safety: Unsafe
    capabilities:
      - Physics
  - name: PhysicsService:CollisionGroupsAreCollidable
    summary: |
      Returns whether the two groups will collide.
    description: |
      Returns whether the two specified collision groups will collide. This
      method will also return true if either of the groups are unregistered, as
      the default collision mask collides with all groups.
    code_samples: []
    parameters:
      - name: name1
        type: string
        default:
        summary: ''
      - name: name2
        type: string
        default:
        summary: ''
    returns:
      - type: boolean
        summary: ''
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - Physics
  - name: PhysicsService:CollisionGroupSetCollidable
    summary: |
      Sets the collision status between two groups.
    description: |
      Sets the collision status between two groups. This method will throw an
      error if either of the groups is unregistered, so it's recommended that
      you confirm each group's registration through
      `Class.PhysicsService:IsCollisionGroupRegistered()` before making this
      call.
    code_samples: []
    parameters:
      - name: name1
        type: string
        default:
        summary: ''
      - name: name2
        type: string
        default:
        summary: ''
      - name: collidable
        type: boolean
        default:
        summary: ''
    returns:
      - type: ()
        summary: ''
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - Physics
  - name: PhysicsService:CreateCollisionGroup
    summary: |
      Creates a new collision group with the given name, and returns the ID of
      the created group.
    description: |
      Creates a new collision group with the given name, and returns the ID of
      the created group.
    code_samples: []
    parameters:
      - name: name
        type: string
        default:
        summary: ''
    returns:
      - type: int
        summary: ''
    tags:
      - Deprecated
    deprecation_message: |
      This method has been superseded by
      `Class.PhysicsService:RegisterCollisionGroup()|RegisterCollisionGroup()`
      which should be used for all new work.
    security: None
    thread_safety: Unsafe
    capabilities:
      - Physics
  - name: PhysicsService:GetCollisionGroupId
    summary: |
      Returns the ID of the collision group with the specified name.
    description: |
      This method returns the ID of the collision group with the specified name.
      It will throw an error if no group with the given name exists.
    code_samples: []
    parameters:
      - name: name
        type: string
        default:
        summary: |
          The name of the collision group being retrieved.
    returns:
      - type: int
        summary: |
          The ID of the retrieved collision group, or `nil` if no such group
          exists.
    tags:
      - Deprecated
    deprecation_message: |
      This method has been deprecated. It's recommended that you query collision
      groups by **name** through a part's
      `Class.BasePart.CollisionGroup|CollisionGroup` property.
    security: None
    thread_safety: Unsafe
    capabilities:
      - Physics
  - name: PhysicsService:GetCollisionGroupName
    summary: |
      Returns the name of the group with the corresponding ID.
    description: |
      Returns the name of the collision group with the corresponding ID. This
      method will return `nil` if the group with the corresponding ID has not
      been named.
    code_samples: []
    parameters:
      - name: name
        type: int
        default:
        summary: ''
    returns:
      - type: string
        summary: ''
    tags:
      - Deprecated
    deprecation_message: |
      This method has been deprecated. It's recommended that you query collision
      groups by **name** through a part's
      `Class.BasePart.CollisionGroup|CollisionGroup` property.
    security: None
    thread_safety: Unsafe
    capabilities:
      - Physics
  - name: PhysicsService:GetCollisionGroups
    summary: |
      Returns a table with info on all of the place's collision groups.
    description: |
      Returns a table with info on all of the place's collision groups. Each
      value in the returned table is itself a table containing three members:

      <table>
        <thead>
          <tr>
            <th>Member</th>
            <th>Type</th>
            <th>Description</th>
          </tr>
        </thead>
        <tbody>
          <tr>
            <td>id</td>
            <td>integer</td>
            <td>The ID of the group.</td>
          </tr>
          <tr>
            <td>mask</td>
            <td>integer</td>
            <td>The collision group's mask; only for internal use.</td>
          </tr>
          <tr>
            <td>name</td>
            <td>string</td>
            <td>The name of the collision group.</td>
          </tr>
        </tbody>
      </table>
    code_samples: []
    parameters: []
    returns:
      - type: Array
        summary: ''
    tags:
      - Deprecated
    deprecation_message: |
      This method has been superseded by
      `Class.PhysicsService:GetRegisteredCollisionGroups()|GetRegisteredCollisionGroups()`
      which should be used for all new work.
    security: None
    thread_safety: Unsafe
    capabilities:
      - Physics
  - name: PhysicsService:GetMaxCollisionGroups
    summary: |
      Returns the maximum number of collision groups.
    description: |
      Returns the maximum number of collision groups the engine supports. This
      value is currently 32.
    code_samples: []
    parameters: []
    returns:
      - type: int
        summary: ''
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - Physics
  - name: PhysicsService:GetRegisteredCollisionGroups
    summary: |
      Returns a table with info on all of the place's collision groups.
    description: |
      Returns a table with info on all of the place's collision groups. Each
      value in the returned table is itself a table and containing two members:

      <table>
        <thead>
          <tr>
            <th>Member</th>
            <th>Type</th>
            <th>Description</th>
          </tr>
        </thead>
        <tbody>
          <tr>
            <td>mask</td>
            <td>integer</td>
            <td>The collision group's mask; only for internal use.</td>
          </tr>
          <tr>
            <td>name</td>
            <td>string</td>
            <td>Name of the collision group.</td>
          </tr>
        </tbody>
      </table>
    code_samples: []
    parameters: []
    returns:
      - type: Array
        summary: ''
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - Physics
  - name: PhysicsService:IsCollisionGroupRegistered
    summary: |
      Checks if a collision group is registered.
    description: |
      Checks if a collision group is registered. It's recommended that you call
      this method before calling methods that throw errors for unregistered
      collision groups, such as
      `Class.PhysicsService:CollisionGroupSetCollidable()`.
    code_samples: []
    parameters:
      - name: name
        type: string
        default:
        summary: ''
    returns:
      - type: boolean
        summary: ''
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - Physics
  - name: PhysicsService:RegisterCollisionGroup
    summary: |
      Registers a new collision group with the given name.
    description: |
      Registers a new collision group with the given name. The name cannot be
      `"Default"`.

      Note that this method has a slight performance overhead based on the
      number of `Class.BasePart|BaseParts` in the workspace, so it's recommended
      that you register all collision groups at edit time through the Studio
      [editor](../../../workspace/collisions.md#collision-groups) and call
      `Class.PhysicsService:UnregisterCollisionGroup()|UnregisterCollisionGroup()`
      and `Class.PhysicsService:RenameCollisionGroup()|RenameCollisionGroup()`
      as infrequently as possible.
    code_samples:
      - PhysicsService-RegisterCollisionGroup
    parameters:
      - name: name
        type: string
        default:
        summary: ''
    returns:
      - type: ()
        summary: ''
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - Physics
  - name: PhysicsService:RemoveCollisionGroup
    summary: |
      Removes the collision group with the given name.
    description: |
      Removes the collision group with the given name. If an invalid name is
      provided, this method will not do anything, although if the reserved name
      `"Default"` is provided, it will throw an error. If there are any parts in
      the collision group when it is removed, these parts will still maintain
      the same collision group ID. The physical behavior of parts in a removed
      group is undefined, so it is recommended to move any parts in a removed
      group to another group. This method will throw a runtime error in the
      following circumstances:

      - The name `"Default"` is provided.
      - The method is called from a client.
    code_samples: []
    parameters:
      - name: name
        type: string
        default:
        summary: ''
    returns:
      - type: ()
        summary: ''
    tags:
      - Deprecated
    deprecation_message: |
      This method has been superseded by
      `Class.PhysicsService:UnregisterCollisionGroup()|UnregisterCollisionGroup()`
      which should be used for all new work.
    security: None
    thread_safety: Unsafe
    capabilities:
      - Physics
  - name: PhysicsService:RenameCollisionGroup
    summary: |
      Renames specified collision group.
    description: |
      Renames the specified registered collision group, but does **not** rename
      the `Class.BasePart.CollisionGroup|CollisionGroup` property of parts that
      utilize the group. The first argument of this method is the name of the
      group to rename, the second argument is the new name for the group. If the
      specified group does not exist, this method will not do anything. The
      naming conventions for the new name follow the same rules as if the group
      was being created with
      `Class.PhysicsService:RegisterCollisionGroup()|RegisterCollisionGroup()`.

      This method will throw a runtime error in the following circumstances:

      - Invalid or empty name provided for either argument.
      - The method is called from a client.

      Note that this method has a slight performance overhead based on the
      number of `Class.BasePart|BaseParts` in the workspace, so it's recommended
      that you register all collision groups at edit time through the Studio
      [editor](../../../workspace/collisions.md#collision-groups) and rename
      them as infrequently as possible.
    code_samples: []
    parameters:
      - name: from
        type: string
        default:
        summary: ''
      - name: to
        type: string
        default:
        summary: ''
    returns:
      - type: ()
        summary: ''
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - Physics
  - name: PhysicsService:SetPartCollisionGroup
    summary: |
      Sets the collision group of a part.
    description: |
      This method sets the collision group of the specified part to the group
      with the specified name. It is equivalent to setting the
      `Class.BasePart.CollisionGroupId`, although calling this method is the
      recommended approach.

      This method will throw a runtime error in the following circumstances:

      - The part parameter is not a `Class.BasePart` instance.
      - The specified group does not exist.
    code_samples: []
    parameters:
      - name: part
        type: BasePart
        default:
        summary: |
          The part being set.
      - name: name
        type: string
        default:
        summary: |
          The name of collision group that the part's collision group is being
          set to.
    returns:
      - type: ()
        summary: ''
    tags:
      - Deprecated
    deprecation_message: |
      This method has been deprecated. It's recommended that you set a part's
      collision group by **name** through its
      `Class.BasePart.CollisionGroup|CollisionGroup` property.
    security: None
    thread_safety: Unsafe
    capabilities:
      - Physics
  - name: PhysicsService:UnregisterCollisionGroup
    summary: |
      Unregisters the collision group for the given name.
    description: |
      Unregisters the collision group for the given name, with the following
      behaviors:

      - If an invalid name is provided, the method will not do anything.
      - If the reserved name `"Default"` is provided **or** if the method is
        called from a client, it will throw an error.
      - If there are any parts in the collision group when it is removed, those
        parts will still maintain the same collision group name. The physical
        behavior of parts in a removed group is undefined, so it's recommended
        to move any parts in a removed group to another group, such as the
        `"Default"` group.

      Note that this method has a slight performance overhead based on the
      number of `Class.BasePart|BaseParts` in the workspace, so it's recommended
      that you register all collision groups at edit time through the Studio
      [editor](../../../workspace/collisions.md#collision-groups) and call this
      method as infrequently as possible.
    code_samples: []
    parameters:
      - name: name
        type: string
        default:
        summary: ''
    returns:
      - type: ()
        summary: ''
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - Physics
events: []
callbacks: []