Hi,
Over on the www-svg@...157... list, there has been some discussion about Catull-Rom splines, triggered by http://schepers.cc/?p=243 and http://schepers.cc/svg/path/dotty.svg :)
These CR curves look exactly like Inkscape's "auto smooth" node type; could someone confirm this? :)
CR curves as per dotty.svg change the 4 segments around the point, although since dotty.svg hasn't got moving points functionality yet, only placing new points, then only the 2 segments before the newly placed point are seen changing as a new point is laid down.
The Inkscape "auto smooth" node type interaction is the opposite in the 0.47 release, where you can't lay down AS nodes but you can change points' type to AS and then move them around, which effects the 4 segments around the point. I haven't checked the trunk source version; does the latest node tool support this?
Cheers Dave