Circle2D is a geometry node that defines a linear X-Y circle with center (0,0) in X-Y plane.
The Circle2D node belongs to the Geometry2D component and its container field is geometry. It is available since X3D version 3.0 or later.
SFNode [in, out] metadata NULL [X3DMetadataObject]
Metadata are not part of the X3D world and not interpreted by the X3D browser, but they can be accessed via the ECMAScript interface.
SFFloat [ ] radius 1 (0,∞)
Simple-geometry dimensions are initializeOnly and cannot be changed after initial creation, for animation use Transform scale instead.