JavaFX 3D is a package within the JavaFX framework that allows developers to create and manipulate 3D objects in a JavaFX application. It provides a set of classes for creating 3D shapes, materials, textures, cameras, and lighting, and allows you to render 3D scenes in a JavaFX application.

With JavaFX 3D, you can create and display 3D models, such as cubes, spheres, and cones, as well as more complex shapes and scenes. You can apply textures and materials to these shapes, and position and move them in 3D space. You can also create cameras and add lighting to your scene to control the way it is displayed.

JavaFX 3D uses a scene graph architecture to manage the 3D scene, where each node in the graph represents a 3D object or a group of objects. This allows you to easily manipulate the objects in the scene, and apply transformations such as rotations, scaling, and translations.

JavaFX 3D also supports interactivity with the 3D objects in your scene, allowing you to handle events such as mouse clicks and mouse movements, and respond to them by changing the position or appearance of the objects.

JavaFX 3D is a powerful tool for creating engaging and interactive 3D visualizations and games in JavaFX applications. However, it requires a good understanding of 3D concepts and mathematics, and may require more resources than traditional 2D JavaFX applications.