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# SCNPhysicsShape.Option

Keys for the options dictionary used when creating a physics shape.

```
struct Option
```

## Discussion

When SceneKit creates a shape from a hierarchy of nodes containing multiple geometries, the [`keepAsCompound`](/documentation/SceneKit/SCNPhysicsShape/Option/keepAsCompound) option takes precedence over the [`type`](/documentation/SceneKit/SCNPhysicsShape/Option/type) option.

For example, if you have a node hierarchy containing several geometries, setting the the [`type`](/documentation/SceneKit/SCNPhysicsShape/Option/type) option to [`boundingBox`](/documentation/SceneKit/SCNPhysicsShape/ShapeType/boundingBox) and the [`keepAsCompound`](/documentation/SceneKit/SCNPhysicsShape/Option/keepAsCompound) option to <doc://com.apple.documentation/documentation/Swift/true> creates a shape that is a combination of several boxes. This approach can provide better simulation performance than converting the entire node hierarchy to a single concave polyhedron shape.

## Topics

### Type Properties

[`collisionMargin`](/documentation/SceneKit/SCNPhysicsShape/Option/collisionMargin)

[`keepAsCompound`](/documentation/SceneKit/SCNPhysicsShape/Option/keepAsCompound)

An option for selecting whether to create a group of independent shapes or combine them into a single shape.

[`scale`](/documentation/SceneKit/SCNPhysicsShape/Option/scale)

An option for selecting the scale factor of the shape relative to the local coordinate space of the node containing it.

[`type`](/documentation/SceneKit/SCNPhysicsShape/Option/type)

An option for selecting the level of detail at which to create shapes from geometry.

[`SCNPhysicsShape.ShapeType`](/documentation/SceneKit/SCNPhysicsShape/ShapeType)

Values for the [`type`](/documentation/SceneKit/SCNPhysicsShape/Option/type) key specifying the level of detail that SceneKit uses when creating a physics shape based on a geometry.


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