Pepakura design4/22/2023 The same doesn't apply to metal, which can be formed to have a compound curve-consider how a bowl is made from sheet steel for example. Grabbing images of wireframes from the web for examples, this mobius strip works, but this torus doesn't. Those lines don't need to be parallel to each other, but they can't have a bend part way through the continuous surface, as making a bent edge work would require a cut, or stretching/squeezing that can't be done with paper. ![]() In unwrapping terms, the curved surface doesn't require cuts to make the folds (you can think of a curve as many small folds, extremely close together), which more specifically mean: there can only be straight lines going across that surface in the wireframe. I only just came across this from trying to find out, who is behind papercraft maker :) I think I can answer your question about computing this, at least as it pertains to paper: with a much finer triangulated wireframe for the sculpted part, a segment that ends up having a curve to it cannot have compound curves, which would be curvature in two directions at the same point.
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