Hi Praveen,
On Fri, 2006-06-30 at 20:24 +0530, Praveen Bhaniramka wrote:
>
> I tried using OSG as well. As you mention, the file size was smaller
> than BIN. However, the data load was even slower than BIN!!!
Yeah, OSB has a little overhead.
> Hmm... That is probably what is going on. Let me try your suggestion and
> report back on what I am getting (probably on Monday - I am travelling
> over the weekend).
OK.
> It was more like 4-5x higher with OpenSG.
Hm, ok, that is very serious. Can you give me access to some of your
test files?
> Let me try the above and get
> back to you. BTW, is there a repository for large VRML data models that
> I can use for my benchmarks? Something from the CAD space would be
> preferable. I am currently using PDB (Protein data models) that I
> convert to VRML and then use in my test app. However, this might not be
> very exciting/convincing for our client :( The data contains a TONNE of
> small spheres in 3D space connected by Cylinders and might be messing
> with the Graph Optimization algorithm that OpenSG uses.
Hm, not sure. But in general we try to avoid generating a very large
number of Nodes, as nodes have overhead, both in the scenegraph and for
the graphics pipeline.
We usually use the Stanford Large Model Repository models for testing,
http://lodbook.com/models/ has a list of links for large models, but not
very many of them are VRML, most are PLY. But those are the other
extreme: a single node with a large number of polygons. I have a tool
that splits them into pieces, which the sort-last implementation needs.
I can give you some split ones if you're interested. But again, not
VRML. :( Not sure if there's a free PLY->VRML converter around, the
OpenSG VRML writer is not used very intensively and probably not very
good.
Yours
Dirk
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