Curve Geometry
A Curve Geometry presents a mathematical 3D line in an entity, i.e. it adds
properties necessary for a line to become part of a model
Curve Geometry wraps a reference to a generic 3D curve or line.
To create a Curve Geometry at runtime, call
IObjectGenerator_DG.Create("ICurveGeometry_DG") to obtain ICurveGeometry_DG.
Use methods of ILineSection_DG to attach a line to the Line Entity.
Use properties and interfaces relevant to the specific mathematical curve to
modify geometry of the curve.
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