Hi guys,
Vaibhav Saxena wrote:
> Basically it is a Cosmo3D/Optimizer based application targeted for CAx
> Industry which needs to be ported to some other SceneGraph API and
> OpenSG seemed to be one of the choices for this. Currently the
> application uses CSB as the storage format but when going to OpenSG,
> these CSB files need to be converted to OSB and hence the question of
> how good/stable OSB is as the data storage format.
>
Well, CSB is not much better defined than OSB. It just has the advantage
of being dead, so it doesn't change any more. ;)
> However this brings up another question, which I am sure, must have
> come to anybody switching from Optimizer to OpenSG. In the CAx
> Industry, there are many existing CSB files out there. What is the
> best way of converting these CSB files to OSB format ? I know there
> are couple of ppl in the mailing list who also went from Optimizer to
> OpenSG, I would really appreciate if somebody could tell me how they
> are converting/converted their existing CSB files to OSB. Is there any
> CSB to OSB converter somewhere ?
>
Andreas and Matthias have a commercial product, based on Optimizer
AFAIK, you need to talk to them about this one.
> With OpenSceneGraph, this conversion seems to be easier, because one
> could just use Performer's converter to convert CSB files to
> performer's pfb and load it inside OpenSceneGraph. I just don't know
> what is the best way with OpenSG.
>
You can use the PerformerLoader in Contrib. For most CSB-style things it
should be fairly complete, I'd think. I never tried it with CSB (no
testfiles), and on my curent box I can't run Performer any more (x64),
so somebody else would have to try that.
Akos Balazs wrote:
> As for OSB, I don't think I would like to have an underdocumented and
> fairly often changed binary format as main storage format, but then again
> I really have no good idea what format should one take. OSG is pretty much
> unusable, and there aren't that many formats OpenSG loads... I think OSB
> is a good choice for caching data, but you'd better make sure that you can
> regenerate your OSB files if necessary... I've also heard Andreas was
> working on maintaining backwards compatibility in OSB, but I have no idea
> how far that got...
>
He has been pretty good about it, and OSB is fairly robust. You might
see some warnings when it tries to load stuff that is not supported in
your version of OpenSG, but unless something major changes compatibility
is pretty good.
Vaibhav Saxena wrote:
> Blame it on my lack of knowledge about OpenSceneGraph, but I would
> like to know why OSG (or binary IVE format) is also not usable as the
> storage format. Does it suffer from the same problems as OSB ( like
> underdocumentation and backward compatibility) ?
>
AFAIK their format is very similar to ours. The main difference is that
we use Reflection to support ours, while they use manual work. I don't
think the local binary formats are a good choice for along term
exchange format, that's what standards like STEP are for.
Akos Balazs wrote:
> Oops, those bloody acronyms again... :( By OSG I meant the ascii (XML
> actually) format of OpenSG, that's supposed to be back- and forwards
> compatible, human readable, etc., but the files tend to be rather big
> (e.g. your textures are inlined as hexdumps or something like that :) and
> reading/writing them is unbearably slow.
>
Actually because .osg files are enormous and slow, the loader has not
gotten a lot of care lately. It is less portable than .osb right now and
primarily useful for debugging, honestly.
Dirk
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