<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">On 2/19/2016 5:56 PM, John Carlson
wrote:<br>
</div>
<blockquote
cite="mid:CAGC3UE=+siY40XYG7LSkP=-Hsk6_hsJ0YR5moxrT=u+Cv3oW5Q@mail.gmail.com"
type="cite">
<p dir="ltr"><br>
> 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.<br>
><br>
> Would it server your purpose if the structure was part of
X3D V4?<br>
><br>
> IOW, something like:<br>
><br>
> ConnectingShape {<br>
> end1: DEF-name of one node (probably Transform)<br>
> end2: DEF-name of another node (probably Transform)<br>
> geometry {...}<br>
> appearance {...}<br>
> }<br>
><br>
> 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.<br>
><br>
> 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?<br>
</p>
<p dir="ltr">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.</p>
</blockquote>
<br>
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. <br>
<br>
I suspect surface thickness is just like lines.<br>
<br>
<br>
<div class="moz-signature">-- <br>
<font class="tahoma,arial,helvetica san serif" color="#333366">
<font size="+1"><b>Leonard Daly</b></font><br>
3D Systems & Cloud Consultant<br>
X3D Co-Chair on Sabbatical<br>
LA ACM SIGGRAPH Chair<br>
President, Daly Realism - <i>Creating the Future</i>
</font></div>
</body>
</html>