minU - minimal U value
maxU - maximal U value
dens - curve density (number of objects along curve path)

VB Code
(creates a list of points for calculations)

Sub RunScript(ByVal minU As Double, ByVal maxU As Double, ByVal dens As Integer)   Dim uStep, i As Double   Dim rv As New List(Of Double)
   uStep = (maxU - minU) / dens
   For i = minU To maxU + 0.0001 Step uStep
      rv.Add(i)
   Next
   u = rv
End Sub

Grasshopper definition: spacialCurves.ghx