Normal defines a set of 3D surface-normal vectors that apply either to a sibling Coordinate|CoordinateDouble node, or else to a parent ElevationGrid node.
Normal values are perpendicular directions that are used per-polygon or per-vertex when computing lighting and shading.
X3D Tooltips of interest:
Normal.
X3D Specification
sections of interest:
11 Rendering component,,
11.2 Concepts,
11.2.2.4 Geometric properties: Normals,
11.3.6 X3DNormalNode
and
11.4.10 Normal.
X3D Examples Archives
of related interest:
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