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Generate a "Coil" vector around a curve
Input requires a curve with a N, curveu and tangentu attribute (via normal and resample node for example).
vector dir = v@tangentu;
float coil = chf("coil");
float profile = chramp("profile", @curveu);
vector outdir = cross(dir, v@N);
matrix3 ratatoing = ident();
rotate(ratatoing, radians(@ptnum*coil), dir);
outdir *= ratatoing;
@width = profile * chf("curve_width");
v@outdir = outdir * profile;