wrote:

> Below example shows that for cubic spline it is not true.

Moreover when I tried forcing type conversion at evaluation time with:

  #macro Test(S) cylinder{ S(0,cubic_spline) S(1,cubic_spline) 1 } #end

I have got strange error:

  cylinder{ S(0,cubic_spline <----ERROR
  Parse Error: linear_spline, quadratic_spline, natural_spline,
  or cubic_spline expected.

ABX

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