# Class: ContactID

Contact ids to facilitate warm starting.

ContactFeature: The features that intersect to form the contact point.

## Constructors

### new ContactID()

> **new ContactID**(): [`ContactID`](/api/classes/ContactID)

#### Returns

[`ContactID`](/api/classes/ContactID)

## Properties

### indexA

> **indexA**: `number` = `-1`

ContactFeature index on shapeA

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### indexB

> **indexB**: `number` = `-1`

ContactFeature index on shapeB

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### key

> **key**: `number` = `-1`

Used to quickly compare contact ids.

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### typeA

> **typeA**: [`ContactFeatureType`](/api/enumerations/ContactFeatureType) = `ContactFeatureType.e_unset`

ContactFeature type on shapeA

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### typeB

> **typeB**: [`ContactFeatureType`](/api/enumerations/ContactFeatureType) = `ContactFeatureType.e_unset`

ContactFeature type on shapeB

## Methods

### recycle()

> **recycle**(): `void`

#### Returns

`void`

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### set()

> **set**(`that`): `void`

#### Parameters

• **that**: [`ContactID`](/api/classes/ContactID)

#### Returns

`void`

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### setFeatures()

> **setFeatures**(`indexA`, `typeA`, `indexB`, `typeB`): `void`

#### Parameters

• **indexA**: `number`

• **typeA**: [`ContactFeatureType`](/api/enumerations/ContactFeatureType)

• **indexB**: `number`

• **typeB**: [`ContactFeatureType`](/api/enumerations/ContactFeatureType)

#### Returns

`void`

***

### swapFeatures()

> **swapFeatures**(): `void`

#### Returns

`void`