3ds Max's UI is causing me a little confusion.
Isn't NURMS the algorithm that Turbosmooth uses? If so, why are there NURMS Sub-Division toggles and cage settings in sub-object mode? What's the difference? What do you gain by having Turbosmooth as a modifiers rather than a sub-object tool? Is there a difference in performance like there is between MeshSmooth and Turbosmooth? Is there any difference in feature set? I notice the NURMS rollout contains a smoothness constraint feature not present in Turbosmooth, what can this practically be used for? On that note, has anyone ever used Separate by Smoothing-Groups/Material IDs to any useful effect?
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TS is the fastest method of the three to do SDS modelling.
And yeah in certain very specific situations smoothing by material/SG can be handy. You can do this and then put another modifier on top. it'll give you a quick and dirty beveling effect. Best thing to do is experiment with it.