For an overview, see Primitives and Attributes.
The attributes that affect only curved line and curved surface primitives are:
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Line Bundle Index OC PEXOCCSetLineBundleIndex
Curve Approximation Method OC PEXOCCSetCurveApprox
Line Bundle Table RA Line Bundle Table
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The PEXlib primitives affected by the above attributes include:
----------------------------------------------------------------------------------- Arc Areas PEXOCCArcAreas Arcs PEXOCCArcs Cones PEXOCCCones Non-uniform B-spline Curve PEXOCCNURBCurve Spheres PEXOCCSpheres -----------------------------------------------------------------------------------
See the sections referenced above for information about each of the curve primitives and the attributes that affect them.
Curve primitives use all of the attributes of lines (see Line Attributes).