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I know that this is an old post.
3D Arcs are not AutoCAD entities. Thus, they are not supported in DXF.
Mathematically an ellipse is a conic section viewed perpendicular to the cutting plane. The ellipse's projection is circular when viewed along the cone's axis.
In that context, with respect to a plane perpendicular to the conic axis, a partial segment of an ellipse would be a 3D arc. These do not exist as AutoCAD entities.
Civil 3D Feature Lines can include 3D arcs. When converted to AutoCAD 3D Polylines, the circular arc sections are approximated by short straight-line segments. (Tessellation.)
Christopher Stevens
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