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

[Michalis Kamburelis]

I have to correct myself -- I see x3d 3.3 specification says """Node names
shall be unique in the context within which the associated DEF keyword
occurs."""

All right, that's good. Looks like this rule was improved at some x3d
version. That's good, it is a better idea to have all names unique (e.g.
for easy EXPORT).

It still remains a question why did my converter generate repeated DEF. It
should not, if source VRML didn't repeat them. I'll look into it -- please
send input to reproduce it:)

Regards,
Michalis

W dniu czw., 26.03.2020 o 12:09 Michalis Kamburelis <
michalis.kambi at gmail.com> napisał(a):

> As I mentioned in the other thread, multiple DEF with the same name
> are just allowed by the X3D specification. Last one "wins" (obscuring
> the others with the same name). Maybe they should be disallowed or
> discouraged, it's another discussion. But right now they are allowed
> and proper VRML / X3D reader should understand them.
>
> As to why my exporter created them -- I need to see the relevant input
> file to answer it. There should be a good reason for it :)
>
> Regards,
> Michalis
>
> czw., 26 mar 2020 o 06:30 John Carlson <yottzumm at gmail.com> napisał(a):
> >
> > 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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> >>>>
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> >
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