
tubes program not working in version 9
Posted:
Dec 7, 2012 1:37 AM


The problem seems to be sometimes it works but mostly it doesn't. The tubes program was written for an earlier version ( works in version 5 I think) by Mark McClure and has worked fine for literally years. I haven't got a clue what has gone wrong. ( technically these are called channel surfaces or the like).
TubePlotFrenet[curve_List, {var_, min_, max_}, radius_, opts___] := Module[{tangent, unitTangent, normal, unitNormal, biNormal}, tangent = D[curve, t]; unitTangent = tangent/Sqrt[tangent.tangent]; normal = D[unitTangent, t]; unitNormal = normal/Sqrt[normal.normal]; biNormal = Cross[unitTangent, unitNormal]; ParametricPlot3D[ curve + radius Cos[s] unitNormal + radius Sin[s] biNormal // Evaluate, {var, min, max}, {s, 0, 2 \[Pi]}, opts]]
r = Cos[q0*t] + 2; x = r* Cos[p0*t]; y = r *Sin[p0*t]; z = Sin[q0*t]; w0 = 8*{x, y, z} h = TubePlotFrenet[w0, {t, 0, 2 \[Pi]}, 1, Axes > None, Boxed > False, PlotPoints > {64, 16}, ColorFunction > "CandyColors", MeshFunctions > {#3 &}]
My other tubes program which came from an answer in this group still works.

