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# SCNConstraint

The abstract superclass for objects that automatically adjust the position, rotation, or scale of a node based on specified rules.

```
class SCNConstraint
```

## Overview

To control the transform (position, rotation, and scale) of one or more [`SCNNode`](/documentation/SceneKit/SCNNode) objects with constraints, create and configure instances of the [`SCNConstraint`](/documentation/SceneKit/SCNConstraint) subclass that provides the behavior you want, then add those constraint objects to each node’s [`constraints`](/documentation/SceneKit/SCNNode/constraints) array.

When SceneKit prepares to render a scene, it examines the list of constraints attached to each node to determine the transform for that node, then applies the new transformation before displaying the scene.

## Topics

### Tuning a Constraint’s Effect on Nodes

[`influenceFactor`](/documentation/SceneKit/SCNConstraint/influenceFactor)

The influence of the constraint on the node’s transformation.

## Relationships

### Inherited By

[`SCNAccelerationConstraint`](/documentation/SceneKit/SCNAccelerationConstraint)

[`SCNTransformConstraint`](/documentation/SceneKit/SCNTransformConstraint)

[`SCNReplicatorConstraint`](/documentation/SceneKit/SCNReplicatorConstraint)

[`SCNIKConstraint`](/documentation/SceneKit/SCNIKConstraint)

[`SCNAvoidOccluderConstraint`](/documentation/SceneKit/SCNAvoidOccluderConstraint)

[`SCNLookAtConstraint`](/documentation/SceneKit/SCNLookAtConstraint)

[`SCNBillboardConstraint`](/documentation/SceneKit/SCNBillboardConstraint)

[`SCNSliderConstraint`](/documentation/SceneKit/SCNSliderConstraint)

[`SCNDistanceConstraint`](/documentation/SceneKit/SCNDistanceConstraint)

### Conforms To

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

[`NSCoding`](/documentation/Foundation/NSCoding)

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

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

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

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

[`NSCopying`](/documentation/Foundation/NSCopying)

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

[`SCNAnimatable`](/documentation/SceneKit/SCNAnimatable)

[`NSSecureCoding`](/documentation/Foundation/NSSecureCoding)

### Inherits From

[`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class)

---

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