Slave  Surfaces

Also called: Surrogate Surfs. Draft Surfs. Etc.The success or failure of a model, depends on how accurately you build the first curves. This is something that I have to try very hard to get my students to come to really understand and many of their early models ended up with failure of the surfaces to achieve G0, G1 or curvature continuity.I have attached a student’s start to one of the best tutorials out there. The pic shows how Curve. Cont. has been achieved on the 0Y profile curve, prior to building Draft surfaces out from it in along the -Y axis.(This is the start of Anthony Eland’s “Retractable Knife” Tutorial, which you can follow at:http://aliasdesign.autodesk.com/learning/tutorials/details/Retractable_Knife_134471/)Good curves here indicated by the shape of the combs. The red lines on the combs meet each other where G2 curvature is required. However there is a big nasty inflexion shown in the top surface.________________________________________________________________

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