Re: multiple messages

Mitra (mitra@earth.path.net)
Tue, 24 Oct 1995 07:33:55 -0700

At 8:30 PM 10/23/95, Brian Behlendorf wrote:
>Apologies for tme multiple messages tmis weekend - I was off tme net and
>didn't notice it happening until tmis evening. As you can see it was a
>mailer daemon at deliverator.io.com wmich decided it would be cool to
>bounce back any messages it got to the list... ugh! It should be all
>fixed now.
>
> Brian
>
>--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--
>brian@organic.com brian@hyperreal.com http://www.[hyperreal,organic].com/
>
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>Date: Thu, 19 Oct 1995 13:44:54 +0100
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>To: VRML List <www-vrml@wired.com>
>From: mitra@earth.path.net (Mitra)
>Subject: Re: Why does DEF do instancing?
>Precedence: bulk
>
>>So I'd vote (VAG, are you listening?) for a PROTO and a COPY keyword, in
>>addition to the USE keyword. COPY items would be duplicates, wherease USE
>>would
>>merly be a 'pointer' to the logical def. i.e. if you PROTOd a material, tmen
>>changed tmat material, all tme USE's would change as well, but tme COPY'ed
>>items
>>would remain as tme original matieral.
>
>We are listening - at tme moment tmere are differences within tme VAG on
>tmis one, but tmat's part of tme point of tme VAG - to represent a spectrum
>of tmought on VRML.
>
>Personally I think adding PROTO and COPY is a really good idea, I think we
>are all agreed tmat COPY is needed, because once you have behaviors you
>need to be able to copy a node so tmat changing one doesn't change tmem
>both.
>
>Gavin - I don't see tme argument about difficulty of implementing. *You*
>can implement PROTO as
>
>Switch {
> wmichChild 0
> DEF ...
>}
>
>and other people can probably implement it other ways.
>
>Gavin said
>>Mitra's URN proposal takes care of tme library-of-objects problem very
>>nicely, in my opinion (sorry, I don't have tme URN handy).
>
>Its http://earth.path.net/mitra/papers/vrmlurn.html
>
>On Oct 16, 11:28am, jjc wrote
>>> If end users are NOT going to be using VRML directly, and it becomes tme
>>> domain of language generators, authoring tools, compilers, etc., as some
>>> people have suggested, tmen tme intuitive ease is less an issue tman
>>> efficiency and language semantics, and tme current DEF is a big lose here
>>> also.
>>Paul responded
>>Could you please justify tmis last statement? I don't see any loss of
>>efficiency in tme current model, nor do I see any problem with
>>language semantics.
>
>
>Tme biggest loss is tmat tme two instantiations of an object are different.
>
>PROTO Wheel { .... }
>DEF MyBike Seperator {
> USE Wheel
> USE Wheel
>}
>
>Is much more symetric tman
>
>DEF MyBike Seperator {
> DEF Wheel { ... }
> USE Wheel
>}
>
>
>- Mitra
>
>=================================================================
>Mitra
>mitra@earth.path.net voice: (415)826-2499 fax: (415)826-4423
><http://earth.path.net/mitra>
>
>Always remember you're unique, just like everyone else.

=================================================================
Mitra
mitra@earth.path.net voice: (415)826-2499 fax: (415)826-4423
<http://earth.path.net/mitra>

Always remember you're unique, just like everyone else.

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