Generalized extrusion along a path

[bgamari]

I just opened a similar issue to this against OpenSCAD itself (https://github.com/openscad/openscad/issues/114), but it applies equally well here.

It would be nice if one could extrude a two-dimensional figure along a path. This would allow the user to specify a path (a series of points or perhaps even a more sophisticated path representation), a 2d figure, and perhaps a basis set to construct the product space of these two spaces. Clearly this is not a trivial request, but it should be recorded nevertheless.

This could be a nice differentiating factor for ImplicitCAD if it is implemented here first. It doesn't seem like it would be too difficult to do this in the implicit function representation.

[colah]

Thanks for bringing this up!

linear_extrude now has scale and translate arguments to facilitate this (it's not arbitrary paths, but it's still powerful).

There's also extrudeOnEdgeOf in the Haskell code. I need to figure out how to integrate it into extopenscad still.

[bgamari]

This looks like a great start! Thanks!

[hmeyer]

what about blending shapes - like so: http://www.thingiverse.com/thing:37117 Would be awesome - and seems pretty feasible...