•The object to be modeled is (visually) analyzed, and then decomposed into collections of primitive shapes.
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•The tree diagram provides a visual method of expressing the “composed of” relationships of the model.
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•Such diagrams are part of 3D program interfaces (e.g., 3D Studio MAX, Maya).
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•Scenegraph: an internal representation of a geometric model, to be rendered
Hierarchical (Tree)
Diagram of Nail
Nail
Head
(cylinder)
Body
root node
leaf nodes
Shaft
(cylinder)
Point
(cone)
tree diagram