Re: [Flightgear-devel] Terrasync for WS3.0

[Scott G. <sc...@gm...>]

Last time I looked at osga it was a disabled feature.  It's worth taking 
a second look though.  IIRC, osga format was merely a binary 
representation and not a compression method.

Scott


On 1/8/24 10:56 AM, Stuart Buchanan wrote:
> On Mon, Jan 8, 2024 at 4:04 PM James Turner wrote:
>
>
>
>>     On 8 Jan 2024, at 15:17, merspieler <mer...@al...>
>>     wrote:
>>
>>     Also (iirc James mentioned that this might be possible) what
>>     about loading the tgx/tgz files directly instead of unpacking
>>     them onto disk?
>>     Would save me from doubling the data, cause I then don't have
>>     to have it once packed for the mirror and once unpacked for use.
>>     Instead I could, just like with ws2.0 terrasync use the same
>>     thing for both.
>
>     It’s possible with some dev effort : easier than the fully general
>     case (Aircraft / FGData from compressed sources) but not trivial
>     unfortunately either. We need to use the OSG Archive stuff to tell
>     osgDB about our compressed files, when someone looks for a path
>     which might be inside one.
>
>
> This (compression) might be easier than it looks if we use the osg 
> archive format directly rather than .tgz files.
>
> The OSG tool that we use to generate the final scenery (osgdem) 
> supports outputting directly to an .osga file ( "-a <archivename>" 
> ).   According to 
> https://www.openscenegraph.com/index.php/documentation/guides/user-guides/56-osgarchive, 
> reading from a .osga file is straightforward:
>
> osg::ref_ptr<osg::Node> gliderNode = 
> osgDB::readNodeFile("archive.osga/glider.osg");
>
> So it is possible that all we need to do is modify 
> simgear/bucket/newbucket.cxx  in the SGBucket::gen_vpb_base()  that is 
> called by VPBTileEntry::VPBTileEntry  so that instead of passing back 
> a base filename of
>
> w120n30/w115n32/ws_w115n32.osgb
>
> we instead return something like
>
> w120n30/w115n32/w115n32.osga/ws_w115n32.osgb
>
> where w120n30/w115n32/w115n32.osga is the name of the archive.
>
> I'm happy to support anyone wanting to investigate this.  
> Alternatively if someone is interested in taking on the re-texturing 
> project (where I'm investigating using stable diffusion to generate 
> new terrains textures without roads etc), then I can look at this instead.
>
> -Stuart
>
>
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