[x3d-public] X3DParticleEmitter node inherit from X3DChildNode(rather than X3DNode)

[Andreas Plesch]

Yes, I am pretty sure Holger is aware. I only brought it up because
Titania/x-ite typically stays very close to the spec. But this is a
capability where Titania/x-ite found it worthwhile to deviate a bit and be
more permissive than the spec. This decision may point to the value of
having a way to DEF any X3DNode (not just child nodes) outside of the scene
graph, outweighing strict compliance.

All the best, Andreas

On Tue, Mar 8, 2022 at 2:22 PM Brutzman, Donald (Don) (CIV) <
brutzman at nps.edu> wrote:

> MetadataSet is only allowed to contain other Metadata* nodes or comments.
> Other content will fail validation (and will not load or import in the
> X3DJSAIL Java and X3DPSAIL Python libraries).
>
>
>
> The right way to cache non-rendered content for DEF/USE libraries is to
> put them as children nodes within a Switch node with whichChoice=’-1’.
>
>
>
> 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 https://
> faculty.nps.edu/brutzman
>
>
>
> *From:* x3d-public <x3d-public-bounces at web3d.org> *On Behalf Of *Andreas
> Plesch
> *Sent:* Tuesday, March 8, 2022 10:11 AM
> *To:* X3D Graphics public mailing list <x3d-public at web3d.org>
> *Subject:* Re: [x3d-public] X3DParticleEmitter node inherit from
> X3DChildNode(rather than X3DNode)
>
>
>
> Of note is that Titania and x-ite allow MetadataSet to have X3DNode nodes,
> eg. any node, in the value field, not just X3DMetadataObject nodes.
>
>
>
> This allows MetadataSet to be used as a NodesLibrary for DEF/USE purposes.
> In fact, this kind of redirection is the default setup for scenes created
> in Titania.
>
>
>
> SVG also has a NodesLibrary equivalent, the <defs> element:
>
>
>
> https://developer.mozilla.org/en-US/docs/Web/SVG/Element/defs
> <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdeveloper.mozilla.org%2Fen-US%2Fdocs%2FWeb%2FSVG%2FElement%2Fdefs&data=04%7C01%7Cbrutzman%40nps.edu%7Ca7f1e8503b27409f46ec08da012f296e%7C6d936231a51740ea9199f7578963378e%7C0%7C0%7C637823599562085821%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=I%2BYZml0d07AjdVyR0CgxDMmSD5mNZT34TxYWHbxBMhI%3D&reserved=0>
>
>
>
> -Andreas
>
>
>
> Date: Mon, 7 Mar 2022 21:29:41 +0100
> From: Michalis Kamburelis <michalis.kambi at gmail.com>
> To: Joseph D Williams <joedwil at earthlink.net>
> Cc: GPU Group <gpugroup at gmail.com>,  "X3D Public Mailing List
>         (x3d-public at web3d.org)" <x3d-public at web3d.org>
> Subject: Re: [x3d-public] X3DParticleEmitter node inherit from
>         X3DChildNode(rather than X3DNode)
> Message-ID:
>         <
> CAKzBGZNToR-7CmaUzRxBE3xx9J6j2mPgmvKAjQKpGQxjdY_0hA at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Perhaps I should have written
>
> """
> The nodes within NodesLibrary don't make any effect, they are not
> traversed. They are only to be reUSEd (referenced) by other parts of
> the graph."
> """
>
> This makes the wording consistent with how e.g. Switch is described.
> Sure you have all the nodes in memory, you just don't traverse to
> inactive parts of Switch, LOD, NodesLibrary etc.
>
> Regards,
> Michalis
>
>

-- 
Andreas Plesch
Waltham, MA 02453
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