AttributeBegin
    Pattern "PxrPrimvar" "PxrPrimvar1"
            "string varname" ["Cs"]
            "string type" ["color"]
  
    Bxdf "PxrSurface" "PxrSurface1"
            "float diffuseGain" [1.0]
            "reference color diffuseColor" ["PxrPrimvar1:resultRGB"]
    #"int specularFresnelMode" [0]
    #    "color specularFaceColor" [1 1 1]
    #    "color specularEdgeColor" [1 1 1]
  
    Basis "b-spline" 1 "b-spline" 1
    Curves "cubic" [8] "nonperiodic"
            "P" [0 0 0   0 0 0   0 0 0
            1 2 0     1.5 2 0
            2 1 0     2 1 0   2 1 0]
            "constantwidth" [0.125]
  
            "N"  [0 1 0  0 1 0  0 1 0
            0 1 0  0 1 0  0 1 0]
  
            "Cs" [0.090 0.501 0.090   0.090 0.501 0.090
            0.090 0.501 0.090   0.090 0.501 0.090
            1 1 0   1 1 0]
AttributeEnd