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

[Leonard Daly]

On 2/19/2016 5:56 PM, John Carlson wrote:
>
>
> > 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.
>

Multiple tie-points changes the structure from a line to a surface. I 
think something like NURBS might be better, but I don't really know 
NURBS. Perhaps Vince can comment.

I suspect surface thickness is just like lines.


-- 
*Leonard Daly*
3D Systems & Cloud Consultant
X3D Co-Chair on Sabbatical
LA ACM SIGGRAPH Chair
President, Daly Realism - /Creating the Future/
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