The nurbspatch scenegraph location, in addition to the usual built-in attributes specified for the location by Katana and arbitrary user data (geometry.arbitrary.*), KtoA supports the following:
geometry.point.Pw: you may use this 4-component float point version to specify control points intead ofgeometry.point.Pgeometry.point.Pref: three floats per control point, specifying a reference pos for use in sticking projective texture/noise/etc to the patch through animation.
The standard attributes geometry.trimcurves, geometry.uSize, and geometry.vSize are ignored (the latter two are inferred from the number of control points, knots, etc).
Note that displacement parameters (set on ArnoldObjectSettings) are also honored for nurbs patches.