NurbsSurface上のこの NurbsSample の U位置の値（Double）を戻します。
set oCube = ActiveSceneRoot.AddGeometry("Cube","NurbsSurface")
set oSurface = oCube.ActivePrimitive.Geometry.Surfaces(0)
for each oNurbsSample in oSurface.NurbsSamples
logmessage "The U value of this sample is: " & oNurbsSample.U
next
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