For an overview, see Primitives and Attributes.
The attributes that affect parametric surface primitives are:
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Interior Bundle Index OC PEXOCCSetInteriorBundleIndex
Parametric Surface Bundle Index OC(a)
PEXOCCSetParaSurfBundleIndex
Parametric Surface Characteristics OC PEXOCCSetParaSurfCharacteristics
(ASF)
Interior Bundle Table RA Interior Bundle Table (LUT) and
Interior Bundle Table (Renderer)
PHIGS Interior Bundle Mode RA PHIGS Interior Bundle Mode
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The PEXlib primitives affected by the above attributes include:
----------------------------------------------------------------------------------------- Non-uniform B-spline Surface PEXOCCNURBSurface -----------------------------------------------------------------------------------------