@acer I have been interested in coloring spacecurves but I haven't figured out a good way of doing that. What you have suggested is very helpful. Additionally, I would like to learn how to colorize a curve based on its parametric representation. Earlier in this thread you referred to an older discussion where you do that but the illustration there is too complicated for me to grasp the underlying idea. Would you be able to provide a simpler example of doing that? For instance, let's take the spacecurve
C := <cos(t), 2*sin(t), t^2/20>;
C1, C2 := diff(C,t), diff(C,t,t);
kappa := Norm(CrossProduct(C1,C2),2) / Norm(C1,2)^3; # curvature
How do we color C over the range 0 < t < 2*Pi according to the curvature kappa? It will be illuminating to see how that is done.