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11

There are many ways of approaching this. Your right a curve does not have to be made out of one piece, it can be built out of several pieces. In fact one curve can be built out of several curves. I have answered a similar question, about spiral caps, mostly the same applies here. When you do is you make a initial shape and then rotate and mirror it about. ...


1

Your surface already has a 2D parametrisation, also known as a uv map. So all you really need to do is drop the function into any 3D app out there assign the texture on the surface and render. For practical purposes it may be good to use something like Mathematica see this manual entry (last basic entry is the same case just different parametric surface). ...


2

SAI has a line smoothing algorithm that samples many points and averages the path. The downside of this is that the feedback gets slower. Given that Photoshop does not have a stellar feedback speed to begin with it may not feel like that. Quite many applications are way better at painting and sketching digitally than Phostohop (Including SAI, Sketchbook, ...



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