How Expensive is X3D Scene Graph? - vrml

Hi there,

Does anybody know how expensive it is to add nodes to X3D scene graphs?
For example, I would like to know how feasible it is to add new objects
to the scene, and remove objects. Can scene graphs even be manipulated
after they have been read from a .wrl or .xml file? I would like to know
if you can move geometry without the need for pre-defined ROUTES.

An example might be a vehicle or something that moves around a scene.

Is there anything to do with X3D that is not a good idea from a
cost-point-of view? Anybody know any good URLs?

Thanks

Dan Garland

> Does anybody know how expensive it is to add nodes to X3D scene graphs?

If you add nodes, that would not be rendered, i think it isn't that
expensive 8-)

> For example, I would like to know how feasible it is to add new objects
> to the scene, and remove objects.

Yes, this is possible. You should have a Node with a MFNode Field in your
world (e.g. use addChildren from Transform or Group).

> Can scene graphs even be manipulated
> after they have been read from a .wrl or .xml file?

Yes.

> I would like to know
> if you can move geometry without the need for pre-defined ROUTES.

If you set directOutput in a script, you can manipulate the scenegraph
without ROUTEs.

> Is there anything to do with X3D that is not a good idea from a
> cost-point-of view?

There are zillions of things, which are not a good idea in realtime
3D rendering in a cost-point-of view 8-)

so long
MUFTI
--
A number of the Windows-based application programming interfaces (APIs) that
are documented as accepting only a module handle are defined incorrectly.
(aus einer M$Windows Dokumentation)

Thanks for the pointers.

Is it possible to create a scene graph, and then as and when it changes
communicate these changes over a network link? (you might suspect what i'm
trying to do here )

Can more than one browser view a world simultaneously? I'd like it so a
movement in one would update in another.

Any thoughts?

Dan

> Is it possible to create a scene graph, and then as and when it changes
> communicate these changes over a network link? (you might suspect what i'm
> trying to do here )

Sure, why not ?
You have only have to communicate the changes by yourself...

> Can more than one browser view a world simultaneously? I'd like it so a
> movement in one would update in another.

There are a few of this programs, even for the old VRML97 standard, e.g.
Deep Matrix. Blax(x)un also sells such a program. A matching open source
program is VNet:

http://www.csclub.uwaterloo.ca/u/sfwhite/vnet/
http://tecfa.unige.ch/vrml/vnet/

so long
MUFTI
--
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to collateralize [finan.] lombardieren
(von dict.leo.org)