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# CollisionFilter

A set of masks that determine whether entities can collide during
simulations.

```
struct CollisionFilter
```

## Overview

Use Collision filters in combination with collision groups to define which
entities collide with which other entities in a scene. For more information
on using collision filters, see [`CollisionGroup`](/documentation/RealityKit/CollisionGroup)

## Topics

### Creating a collision filter

[`init(group: CollisionGroup, mask: CollisionGroup)`](/documentation/RealityKit/CollisionFilter/init(group:mask:))

Creates a collision filter.

[`static let `default`: CollisionFilter`](/documentation/RealityKit/CollisionFilter/default)

The default collision filter.

[`static let sensor: CollisionFilter`](/documentation/RealityKit/CollisionFilter/sensor)

A collision filter for an entity that collides with everything.

### Customizing groups

[`var group: CollisionGroup`](/documentation/RealityKit/CollisionFilter/group)

The collision group or groups, stored as a bit mask, to which the entity
belongs.

[`var mask: CollisionGroup`](/documentation/RealityKit/CollisionFilter/mask)

The collision group or groups, stored as a bitmask, with which the
entity can collide.

### Comparing collision filters

## Relationships

### Conforms To

[`Equatable`](/documentation/Swift/Equatable)

---

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