Hey, it just occurred to me that this syntax could be extended with other
options. Imagine the following:

#declare Spline =
spline {
   Spline_Type(Cubic_Spline)
   Spline_Points(7)
   Spline_Speed(Constant)

   SCP( 0.0, <0,1,2>)
   SCP(   x, <1,5,0>)
   SCP(   x, <4,1,0>)
   SCP(   x, <0,2,1>)
   SCP(   x, <0,0,1>)
   SCP(   x, <6,5,4>)
   SCP( 2.0, <4,3,2>)

   Spline_End()
}

I think this is beginning to be interesting! I hope you agree that the
approach shown here would fit well in the official include files?

Rune
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