The `com.jme3.input` package contains the scene graph implementation in jMonkeyEngine.

The scene graph is the most important package in jME, as it is the API used to manage scene elements so that they can be rendered. The {@link com.jme3.scene.Spatial} class provides a common base class for all scene graph elements. The {@link com.jme3.scene.Node} class provides the "branches" in the graph, used to organize elements in a tree hierarchy. The {@link com.jme3.scene.Geometry} is the leaf class that will contain a {@link com.jme3.scene.Mesh} object (geometry data such as vertex positions, normals, etc) and a {@link com.jme3.scene.Material} object containing information on how the geometry should be shaded.