Scene graphs
A scene graph is a general data structure that defines the spatial and logical relationship of a graphical scene for efficient management and rendering of graphics data. It is typically represented as a hierarchical graph, which contains a collection of graphics nodes including a top-level root node, a number of group nodes each of which can have any number of child nodes, and a set of leaf nodes each of which has zero child nodes and that serve together as the bottom layer of the tree. A typical scene graph does not allow a directed cycle (where some nodes are connected in a closed chain) or an isolated element (a node that has no child or parent) inside of itself.
Each group node can have any number of children. Grouping these
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