[x3d-public] ProtoBody completeness in nested Protos

[GPU Group]

freewrl loads extern proto scenes as whole scene files, but as 'dead'
scenery like a library file: in binary form, ready to binary deep copy
parts to live scenery, but node initialization functions not yet
called, and not rendered. Subsequent # references to the same scene file
use the same loaded library scene. So any ProtoDeclares outside the
ProtoBody would be resolved.
-Doug
PS this relates to:

PROTOTYPE STYLE IMPORTS

I had mentioned a prototype style import for gltf use:

Shape { url=”library.gltf#shapeName” }

Similar to how we load extern protos as a whole ‘dead’ scene, and then do
binary deep copies where used in the live scene to make live.

But interestingly, the same goes for x3d scenery – don’t need glTF, don’t
need extern protos in library scene, don’t need Inline or IMPORT.

So the concept could be tested first with x3d scenery.

Shape { url=’library.x3dv#shapeName }

And then extended to gltf.

/PROTOTYPE STYLE IMPORTS

On Sun, Apr 24, 2022 at 10:43 PM Brutzman, Donald (Don) (CIV) <
brutzman at nps.edu> wrote:

> Actually please look a little more closely at that (admittedly tricky)
> example.
>
> * CircleFish is an ExternProto, separately defined in another file
> * CircleFishLod is a ProtoDeclare defined in that first file,
> CircleFishLodPrototype.x3d
> * CircleFishLod ProtoBody contains two ProtoInstance copies of CircleFish
> * CircleFishLod ProtoDeclare is then followed by a CircleFishLod
> ProtoInstance (again  in CircleFishLodPrototype.x3d)
>
> So I would expect an X3D Browser to
>
> a. load ExternProtoDeclare      CircleFish
> b. build ProtoDeclare                CircleFishLod
> c. create inner ProtoInstance  CircleFish for use
> d. create outer ProtoInstance CircleFishLod
>
> Order of steps might vary a bit, but those are the dependencies.  Good luck
> sir.
>
> 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
>
> -----Original Message-----
> From: x3d-public <x3d-public-bounces at web3d.org> On Behalf Of Andreas
> Plesch
> Sent: Sunday, April 24, 2022 9:08 PM
> To: X3D Graphics public mailing list <x3d-public at web3d.org>
> Subject: [x3d-public] ProtoBody completeness in nested Protos
>
> ProtoDeclarations may use ProtoInstances of other Protos inside their
> ProtoBody definitions.
>
> For example, the CircleFishLod proto here:
>
>
> https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fx3dgraphic
> s.com
> %2Fexamples%2FX3dForWebAuthors%2FKelpForestExhibit%2FCircleFishLodProto
> typeIndex.html&data=05%7C01%7Cbrutzman%40nps.edu
> %7C0b4a867ba9874e371f9b0
>
> 8da267152fa%7C6d936231a51740ea9199f7578963378e%7C0%7C0%7C637864565880708349%
>
> 7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwi
>
> LCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=upr4eckI8axT7MO5fAUvAWfyBzUJfhTwqcp
> BuH7tZjc%3D&reserved=0
>
> uses ProtoInstances of the CircleFish proto.
>
> A more extreme case of nesting is:
>
>
> https://www.web3d.org/x3d/content/examples/ConformanceNist/Miscellaneous/PRO
> TO/fivedeepnestingIndex.html
> <https://www.web3d.org/x3d/content/examples/ConformanceNist/Miscellaneous/PROTO/fivedeepnestingIndex.html>
>
> where Proto1 uses ProtoInstance of Proto2 inside its ProtoBody. Proto2
> itself uses a ProtoInstance of Proto3 inside its ProtoBody. And so on to
> five levels deep.
>
> The second example with the deep nesting currently works with x3dom but the
> seemingly simpler CircleFishLod proto does not.
>
> The reason is that x3dom expects the complete definition of a proto to be
> contained in its ProtoBody. However, The CircleFishLod proto only contains
> the CircleFish ProtoInstances in the body but not the associated CircleFish
> ProtoDeclaration which for some reason occurs outside the CircleFishLod
> ProtoBody (and outside the CircleFishLod ProtoDeclaration).
>
> Expecting the ProtoBody to be complete and self-contained seems rather
> natural. Is x3dom too strict in this regard, or is there an oversight in
> the
> example ? There is not much guidance in the spec., if any.
>
> Thanks, Andreas
>
> --
> Andreas Plesch
> Waltham, MA 02453
>
> _______________________________________________
> x3d-public mailing list
> x3d-public at web3d.org
> http://web3d.org/mailman/listinfo/x3d-public_web3d.org
> _______________________________________________
> x3d-public mailing list
> x3d-public at web3d.org
> http://web3d.org/mailman/listinfo/x3d-public_web3d.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://web3d.org/pipermail/x3d-public_web3d.org/attachments/20220425/fdcca17c/attachment.html>