The brightness of a face in VRML shape depends on how much it is lit by light in the VRML world. The more a face is oriented toward a light, the more brightly it is shaded by the VRML browser.
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Surface normal determines the orientation of the surface.
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VRML browser measures the angle between the light rays and the normal of the surface and calculates the shading of that surface.
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It is also possible to provide the surface normals so that the browser does not spend time to calculate them.
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IndexedFaceSet and ElevationGrid node have a normal field. By using a Normal node, it is possible to define these surface normals
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Normal {
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vector [] # exposedField MFVec3f
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}
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vector field specifies a list of unit normal vectors that may be used as normals for a shape.
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