In Pixyz Studio, the Product Structure is composed of one node type only, called occurrence. The Product Structure is an occurrence tree.
An occurrence is the fundamental object of a scene's Product Structure, and is similar to the gameObject concept in Unity3D.
An occurrence is by default an empty node, that does not contain any geometry. It does not accomplish much by itself, but it acts as a container for components, which implement the real aspect and/or functionality.
An occurrence is identified by a unique Id, and owns properties carrying information about the occurrence.
See the following topics to learn more about occurrences: