The body’s moment of inertia, expressed in the local coordinate system of the node that contains the body.
- iOS 9.0+
- macOS 10.11+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
A body’s moment of inertia determines how it responds to torques (that is, forces with a rotational component). Each component of this vector is the moment of inertia for the corresponding principal axis (in the coordinate system containing the physics body). For example, if the x-component value of the moment vector is less than the y-component value, the body rotates more freely about its x-axis than its y-axis.
By default, SceneKit automatically determines the body’s moment of inertia based on its shape and mass. Use this property to define a custom moment of inertia (for example, to model an object of non-uniform density). Using a custom moment of inertia requires setting the
uses property to