Description:
3D CURVE: a 3D function defined by a list of [x,y,z] coordinates.
3DC objects are constructed from the list of X coordinates (<x-points>), the list of Y coordinates (<y-points>) and the list of Z coordinates (<z-points>).
If <x-list>, <y-list> and <z-list> are not of the same length, the last coordinate (for y and z) or the last step (for x) is repeated in the shorter lists.
<decimals> allows to specify the precision of the function (0 = integers, n > 0 = number of decimals)
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