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What are you trying to do that you can't do with a 2D sketch of a spline?
Constrain each end of a spline, and add 1 or more spline points, and move them as required. What additional control are you looking for?
I am matching print to tool on a thermoformed part. The process is to make a tool and form a part. After the part is formed the sheet stretches and distorts the print in a way that makes it not line up with the tool cavities. I am searching for a way to pre distort the sketch so that when it gets distorted by the forming operation it lines up with the cavities. I am not looking for software that automatically predicts this distortion. I think all I need to do is print, form, look at the result and then distort the sketch and then print again.