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VRML1 defines scene graphs which are defined hierarchically as a set of nodes
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Nodes fall into one of 36 types arranged into broad classes -- shape, geometry/material, transformation, camera, lighting, group and WWWInline
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The state of a graph (color, position, rotation etc.) are "advanced" (e.g. transformation matrices are multiplied) when each node is encountered
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separators are used to limit the effect of a given node to a block defined by { }
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Thus the order in which nodes appear in file is very significant
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