[x3d-public] Extrusions, take 3, Replacement with Cylinders, Cobweb needs to be updated in X3D Edit.

[John Carlson]

> Having a node that creates geometry between two other Transforms is
potentially very useful. I think it is part of the layering component,
though I never investigated that.
>
> Would it server your purpose if the structure was part of X3D V4?
>
> IOW, something like:
>
> ConnectingShape {
>     end1: DEF-name of one node (probably Transform)
>     end2: DEF-name of another node (probably Transform)
>     geometry {...}
>     appearance {...}
> }
>
> The system would handle the geometry creation and coordinate
transformations to keep everything aligned. It might need to be a limited
type of geometry, e.g. just a cross-section.
>
> This would (in essence) be a very simple Extrusion with just the end
points and no change in cross section. I think this would solve your
problem, but would it be too limiting?

I do like this design.  I might apply it to more areas such as stretching a
polygon between several points like a physical trampoline, or for forcing
physical hubs (joints).  Also SVG extrusions could be implemented this
way.  It's too bad webgl doesn't support line width well.  What about
surface thickness?   I am thinking of export to PLY and STL for 3d printing.
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