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Question about interpCrv(interpolation curve) degree in relation to polynomial interpolation

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@AndrewAhn wrote:

rhino uses polynomial interpolation for its InterpCrv.
(http://docs.mcneel.com/rhino/5/help/en-us/commands/changedegree.htm#Degree)

Since polynomial interpolation method makes N-1 degree polynomial function(ex. to interpolate 5 points, highest polynomial degree is 4), where degree cannot be an option to change,

how does interpcrv function has a ‘degree’ input with it?

if I am interpolating N points into a curve, isn’t degree become automatically N-1?

Does ‘degree’ input in interpcrv has different meaning than ‘degree’ as used in polynimial function?

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