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Summary

Scene graphs are created using nodes. Nodes are the fundamental VRML programming unit and contain data and event fields that define both state and behavior (VRML nodes are analogous to classes used in object-oriented languages such as C++ and Java). VRML97 has nearly 60 different built-in nodes that developers can use to construct interactive and animated 3D content.

VRML nodes are used to create both primitive and complex objects. VRML supports four primitive objects—boxes, cones, cylinders, and spheres—that can be used to form more complicated objects (a snowman can be constructed using a series of progressively larger spheres, for example). Complex, arbitrary shapes are also supported by VRML, allowing developers to create shapes that are more natural and organic compared to those created with primitives.


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