Re: [FreeWRL-develop] clipping plane was getting and setting view and projection

[Mike R. <mik...@gm...>]

Thanks Doug, will certainly take a look when we get the file loading more
stable  and can start pulling out some of the node details into 'droid. I
guess these LODs should map through to the likes of CityGML LODs which I was
planning on implementing a selector for anyway.


On 27 May 2011 18:29, doug sanden <hig...@ho...> wrote:

>
>
> >
> > wrt the far clipping plan; I have been using this as a mechanism for
> > limiting the distance a user can 'see' as we're dealing with geographic
> > coordinates/ scenes - often there is no point trying to render data
> > that is 2km away which will probably be computationally expensive on a
> > smartphone.
> > It could be that my current opengl implementation is a poor design
> > (most likely) therefore swapping to FreeWRL rendering will cause this
> > to be a non-issue.
> >
>
> Mike,
> There's also something called GeoLOD (level of detail) which should keep
> distant objects out of the rendering -or allow a courser resolution in the
> distance.
>
> http://web3d.org/x3d/specifications/ISO-IEC-19775-1.2-X3D-AbstractSpecification/Part01/components/geodata.html#GeoLOD specs
>
>
> -Doug
>
> more...
> see http://dug9.users.sourceforge.net/banff.zip
> banff_GLOD_rootNode.x3d  2-level
> banff_GLOD_rootUrl.x3d 3-level
> for examples. These are both what I would call 2-level GeoLODs. You don't
> get the maximum range-restricting benefit from these 2-levels (you'll just
> get high/low res swapping in/out). For that, you need 3+ level. In 3+ level
> I've seen chunks of scenery disappear in the distance as it goes out of
> range.
>
>
> ^I don't have an example of 3-level prepared, but it's just more of the
> same. For MS windows/win32 I have a GLOD snapshot generator that uses
> googleEarth, and I tested it with 2 level but it has a 3 level setting that
> might work.
> http://sourceforge.net/projects/freewrl/files/freewrl-win32/SupportFiles/ Freewrl_Launcher.zip
>
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