[x3d-public] Finding more than one use of a DEF in VRML

[Joseph D Williams]

➢ why HTML DOM is a poor choice...

not for a 2D scene using an life-support event model. Look deep and see how we use the latest DOM stuff to work with X3D. 

The DOM is the DOM and the SAI is the SAI. They meet in the X3DOM for better or worse. But don’t worry,  the DOM will get there some day, just notice how much in just the past years it has become more alive and better able to approximate and (by the innovation applied by the realtime interactive graphics community and a more agreeable DOM) even interface with x3d style realtime system.  

As for DEF/USE, there was an old html thing, I forget the name, but you defined the object in the head and then abused it by ID in the body. 
Thanks,
Joe 

From: John Carlson
Sent: Wednesday, March 25, 2020 10:30 PM
To: GPU Group
Cc: X3D Graphics public mailing list
Subject: Re: [x3d-public] Finding more than one use of a DEF in VRML

DEF/USE is how multiparent nodes are achieved, but all DEF and USE with the same value are the same node, except for a few special cases.

This is what one reason why HTML DOM is a poor choice...the nodes have only one parent.

Or I’m still battling windmills?

John

On Wed, Mar 25, 2020 at 10:16 PM GPU Group <gpugroup at gmail.com> wrote:
double defining:
- this stymied me too, until I realized the DEF/USE are just for the parser, and its the sequence that counts although different for different browsers.
- if you redef 3 times, then USE, what will you get?
- that depends on the web3d browser, with some sticking to the first DEF, some the last DEF.

On Wed, Mar 25, 2020 at 9:01 PM John Carlson <yottzumm at gmail.com> wrote:
If one DEF specified a shape and another DEF with the same value with a different shape, wouldn't the 2 browsers show different shapes if they picked different DEFs?

I don't think double DEFs should be allowed within the same namespace.

John

On Wed, Mar 25, 2020 at 9:12 PM GPU Group <gpugroup at gmail.com> wrote:
Chisel? "it was simply put in the public domain by Trapezium when they folded many years ago. They didn¹t specify any license" - Louka
http://dug9.users.sourceforge.net/web3d/temp/chisel-src.zip
But I suspect double-deffing isn't illegal. I think I've been through it, and different browsers honored the first or last definition.
-Doug

On Wed, Mar 25, 2020 at 7:43 PM John Carlson <yottzumm at gmail.com> wrote:
That is, more than one DEF with the same value.

I realize that separate PROTOs may have the same DEF due to namespaces.   Unfortunately writing a Unix script to find this takes massive brain power.

John

On Wed, Mar 25, 2020 at 8:37 PM John Carlson <yottzumm at gmail.com> wrote:
I’m not particular looking for a vrml parser unless it catches double use of a DEF.

Thanks,

John

I’m thinking my next project might be a VRML validator if there isn’t one handy?  Anyone?

I know I can translate VRML to XML.

John

On Wed, Mar 25, 2020 at 3:38 PM John Carlson <yottzumm at gmail.com> wrote:
Say, where is a VRML Validator? !!!!

On Wed, Mar 25, 2020 at 3:33 PM John Carlson <yottzumm at gmail.com> wrote:
I will download X3D-Edit and do some validation on the files, or go to the validation site @ savage
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