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This node represents a 3D shape formed by constructing faces (polygons) from vertices located at the current coordinates.
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IndexedFaceSet uses the indices in its coordIndex field to specify the polygonal faces.
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An index of -1 indicates that the current face has ended and the next one begins.
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The vertices of the faces are transformed by the current transformation matrix.
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Treatment of the current material and normal binding is as follows:
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The PER_PART and PER_FACE bindings specify a material or normal for each face.
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PER_VERTEX specifies a material or normal for each vertex.
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The corresponding _INDEXED bindings are the same, but use the materialIndex or normalIndex indices.
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The DEFAULT material binding is equal to OVERALL.
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The DEFAULT normal binding is equal to PER_VERTEX_INDEXED;
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if insufficient normals exist in the state, vertex normals will be generated automatically.
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MaterialBinding Specification totally changed in VRML2 -- its easier!
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