These documents are refreshed/augmented from their ancestors.
Disambiguate: Polyline CAD style has > 1 subspaces.

Spline Polyline Hermite [SubSpaces MOST Used].sm (61 KiB) downloaded 71 time(s).
Spline Polyline [Hermite vs bSpline] Copy.sm (98 KiB) downloaded 68 time(s).

Wrote

These documents are refreshed/augmented from their ancestors.
Disambiguate: Polyline CAD style has

This MOST Used has been refreshed, slightly augmented, doctored.

Spline Polyline Hermite [SubSpaces MOST Used].sm (105 KiB) downloaded 60 time(s).

Wrote

This MOST Used has been refreshed, slightly augmented, doctored.

... closed shapes have interest in Engineering: added

Spline Polyline Hermite [SubSpaces MOST Used].sm (337 KiB) downloaded 54 time(s).

Wrote

... closed shapes have interest in Engineering: added

This regular heptagon in separate document.
If added on the original, there is conflict.
Couldn't doctor, so: as is demo ... Jean

Spline Polyline Hermite [SubSpaces MOST Used Fourier Polygon].sm (79 KiB) downloaded 58 time(s).