CalculiX Advanced Environment is designed to guide you through the CalculiX keywords creation process and is aimed to help you reach the correct input file with no mistakes.
enhancement:
Circular Arcs are simple but not the best curves in nature and in technics.
Bezier Splines are limited in precision and mathematics.
spiro splines are Derivats of spirals and better splines than bezier splines.
enhancement: Circular Arcs are simple but not the best curves in nature and in technics. Bezier Splines are limited in precision and mathematics. spiro splines are Derivats of spirals and better splines than bezier splines.
See phd Levien https://levien.com/phd/phd.html
spiro splines are implemented in Inkscape.
see some more information in https://raphlinus.github.io/curves/2018/12/21/new-spline.html and Code in https://levien.com/spiro/
in Inkscape the spiro path tool was improved to more stability and robustness. Source code is free and open source available.