[X3D-Public] [Cad] Additive Manufacturing File Format -Wikipedia, the free encyclopedia

[Joe D Williams]

As usual in this style of encoding of geometry data, the main idea is 
that we get back to basics and all variables are superficially simple 
in the user code then combined into application-specific data types 
like tuples of various kinds in a process one level up, not 
necessarily in the user code.

Usually it is easy enough to put these into X3D xml or Classic 
strictly defined data structures or any other 3D tool but that does 
not mean this degenerate method of encoding X3D scene data should be 
acceptable in X3D.

Is this naming of elements and representation of data in the user code 
compatible with Collada - that would be important.

In this

<object id="0">
<mesh>
<vertices><vertex><coordinates><x><y><z>
<volume><triangle><v1><v2><v3>

mesh example 'vertices' with its simple 'vertex' 'coordinates' and 
'volume' with its simple  'triangle'(s) would be set into a shape node 
'points' and 'coordIndex' fields. Same info, much fewer characters.

Basic check would be to see if there are any keywords like 'triangle' 
or 'object' could be found that cannot be styled into X3D.

> triplet representations looks extremely inefficient :^)

A supporter of only simple but heavily labelled containerification of 
actual data at  the user code level is that a lot of the apparent 
duplication, well, that gets mostly compressed away.
And really, the simp ... /simp ... lified ... /lified exam ... ples 
... are much easier to explain and troubleshoot:)) - at first anyway.

I think a big counter today might be that current X3D and Classic 
strict typing of fields simply works lots better for JSON.

Best Regards,
Joe


----- Original Message ----- 
From: "Richard F. Puk" <puk at igraphics.com>
To: "'Don Brutzman'" <brutzman at nps.edu>; "'Cad3D working group'" 
<Cad at web3d.org>
Cc: "'X3D Graphics public mailing list'" <x3d-public at web3d.org>
Sent: Wednesday, December 18, 2013 9:58 AM
Subject: Re: [X3D-Public] [Cad] Additive Manufacturing File 
Format -Wikipedia, the free encyclopedia


> Hi --
>
> The format for coordinate and other triplet representations looks 
> extremely
> inefficient :^)
>
>  -- Dick
>
> /******************************************
> | Richard F. Puk, Ph.D., President
> | Intelligraphics Incorporated
> | 7644 Cortina Court
> | Carlsbad, CA  92009-8206
> | Tel: +1-760-753-9027  Mobile:  +1-760-809-9027
> | Email:  puk at igraphics.com
> \******************************************
>
>
>
>
> -----Original Message-----
> From: cad [mailto:cad-bounces at web3d.org] On Behalf Of Don Brutzman
> Sent: Wednesday, December 18, 2013 9:36 AM
> To: Cad3D working group
> Cc: X3D Graphics public mailing list
> Subject: [Cad] Additive Manufacturing File Format - Wikipedia, the 
> free
> encyclopedia
>
> Wondering if anyone in the CAD working group has looked at AMF yet?
>
> https://en.wikipedia.org/wiki/Additive_Manufacturing_File_Format
>
> p.s. it has been pointed out that the x y z representations are
> "interesting"...
>
> <?xml version="1.0" encoding="UTF-8"?>
> <amf unit="millimeter">
>   <object id="0">
>     <mesh>
>       <vertices>
>         <vertex>
>           <coordinates>
>             <x>0</x>
>             <y>1.32</y>
>             <z>3.715</z>
>           </coordinates>
>         </vertex>
>         ...
>       </vertices>
>       <volume>
>         <triangle>
>           <v1>0</v1>
>           <v2>1</v2>
>           <v3>3</v3>
>         </triangle>
>         ...
>       </volume>
>     </mesh>
>   </object>
> </amf>
>
> p.p.s. Incidentally ASTM is charging $48 for this 15-page ISO 
> standards
> document.
> http://www.astm.org/Standards/F2915.htm
>
> all the best, Don
> -- 
> Don Brutzman  Naval Postgraduate School, Code USW/Br 
> brutzman at nps.edu
> Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA 
> +1.831.656.2149
> X3D graphics, virtual worlds, navy robotics 
> http://faculty.nps.edu/brutzman
>
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