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Is this the same idea as Inkscape's smooth points? ("make selected nodes auto-smooth") Or is it a different method?

EDIT: hmm, the behaviour is not quite the same - inkscape seems to move the handles of its auto-smooth nodes only in response to the positions of neighbouring nodes. This "hyperbezier" demo moves its handles in response to positions of both neighbouring nodes and their handles.

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This is correct, the hyperbezier positions auto points to maintain curvature, so anything that impacts curvature of a segment can cause adjustment of the handles of neighbouring segments. In addition, auto points do not need to be smooth; you can have a corner with two auto points, which will be adjusted automatically in response to changes in segments to their 'side' of the corner (see the heart demo on the page for an example of this.)

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