[Home](./index.md) > [server](./server.md) > [RigidBody](./server.rigidbody.md) > [effectiveAngularInertia](./server.rigidbody.effectiveangularinertia.md) ## RigidBody.effectiveAngularInertia property The effective angular inertia of the rigid body. **Signature:** ```typescript get effectiveAngularInertia(): SpdMatrix3 | undefined; ```