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Circle2D : X3DGeometryNode { 
  SFNode  [in,out] metadata NULL  [X3DMetadataObject]
  SFFloat []       radius   1     (0,∞)

The Circle2D node specifies a circle centred at (0,0) in the local 2D coordinate system. The radius field specifies the radius of the Circle2D. The value of radius shall be greater than zero. Figure 1 illustrates the Circle2D node with a dashed linetype applied.

Figure 1 - Circle2D node

The Common geometry fields section of the X3D specification provides a complete description of the solid field.